BSNL GE-JTO Recruitment Examination -IV Question Paper

 

NOTE : All Answer Are In BOLD Style.

 

 

1. When a piece of copper and another of germanium are cooled from room temperature to 800 K then the resistance of -

a) Each of them increases

b) Each of them decreases

c) Copper increases and germanium decreases

d) Copper decreases and germanium increases

 

2. When a signal of 10 mV at 75 MHz is to be measured then which of the following instrument can be used -

a) VTVM

b) Cathode ray oscilloscope

c) Moving iron voltmeter

d) Digital multimeter

 

3. When a sample of germanium and silicon having same impurity density are kept at room temperature then -

a) Both will have equal value of resistivity

b) Both will have equal value negative resistivity

c) Resistivity of germanium will be higher than that of silicon

d) Resistivity of silicon will be higher than that of germanium

 

4. When an RC driving point impedance function has zeros at s= -2 and s=-5 then the admissible poles for the function would be

a) s = 0; s = -6

b) s = 0; s = -3

c) s = 0; s = -1

d) s = -3; s = -4

 

5. For the n-type semiconductor with n = Np and p = n2/ND, the hole concentration will fall below the intrinsic value because some of the holes -

a) drop back to acceptor impurity states

b) drop to donor impurity states

c) Virtually leave the crystal

d) recombine with the electrons

 

6. The location of lighting arrestor is -

a) Near the transformer

b) Near the circuit breaker

c) Away from the transformer

d) None

 

7. Time constant of an RC circuit increases if the value of the resistance is -

a) Increased

b) Decreased

c) Neither a nor b

d) Both a and b

 

8. Telemetering is a method of

a) Counting pulses sent over long distances

b) Transmitting pictures from one place to another

c) Transmitting information concerning a process over a distance

d) None

 

9. When the gauge factor of a strain gauge is 2, stress is 1050 kg/cm2, Y = 2.1? 106 kg/cm2 and R is 100 ohms then the value of DR will be -

a) 2W

b) 3W

c) 4W

d) 1W

 

10. As the drain voltage is increased for a junction FET in the pinch off region then the drain current

a) Becomes zero

b) Abruptly decreases

c) Abruptly increases

d) Remains constant

 

11. One of the following, which is not a transducer in the true sense, is -

a) Thermocouple

b) Piezoelectric pick up

c) Photo-Voltaic cell

d) LCD

 

12. When a transistor is required to match a 100W signal source with a high impedance output circuit then the connection that would be used is -

a) Common base

b) Common collector

c) Common emitter

d) Emitter follower

 

13. In a JFET gates are always

a) forward biased

b) reverse biased

c) unbiased

d) none

 

14. The main factor which differentiate a DE MOSFET from an E only MOSFET is the absence of

a) insulated gate

b) electrons

c) channel

d) P-N junction

 

15. An SCR conducts appreciable current when

a) Anode and gate are both negative with respect to cathode

b) Anode and gate are both positive with respect to cathode

c) Anode is negative and gate is positive with respect to cathode

d) Gate is negative and anode is positive with respect to cathode

 

16. Silicon is not suitable for fabrication of light emitting diodes because it is -

a) An indirect band gap semiconductor

b) A direct band gap semiconductor

c) A wide band gap semiconductor

d) A narrow band gap semiconductor

 

17. An average responding rectifier type electronic ac voltmeter has its scale calibrated in terms of the rms value of a sine wave, when a square wave voltage of peak magnitude 100V is measured using this voltmeter then the reading indicated by the meter, will be

a) 111V

b) 100V

c) 90.09V

d) 70.7V

 

20. Which one of the following conditions for Z parameters would hold for a two port network containing linear bilateral passive circuit elements -

a) Z11 = Z22

b) Z12Z21 = Z11Z22

c) Z11Z12 = Z22Z21

d) Z12 = Z21

 

 

25. While calculating Rth, constant current sources in the circuit are -

a) replaced by opens

b) replaced by 'shorts'

c) treated in parallel with other voltage sources

d) converted into equivalent voltage sources

 

26. Maxwell's loop current method of solving electrical networks

a) uses branch currents

b) utilizes kirchhoff's voltage law

c) is confined to single-loop circuits

d) is a network reduction method

 

27. A transmission line of characteristic impedance Z0 = 50 ohms, phase velocity Vp = 2 x 108 m/s and length l = 1m is terminated by a load ZL= ( 30 - j 40 ) ohms. The input impedance of the line for a frequency of 100 MHz will be

a)(30 + j40 ) ohms

b)( 30 - j40 ) ohms

c)(50 + j40 ) ohms

d)(50 - j40 ) ohms

 

28. For an elliptically polarized wave incident on the interface of a dielectric at the Brewster angle then the reflected wave will be

a) Elliptically polarized

b) Linearly polarized

c) Right circularly polarized

d) Left circularly polarized

 

29. A yagi antenna has a driven antenna-

a) Only

b) With a reflector

c) With one or more directors

d) With a reflector and one or more directors

 

30. The number of lobes on each side of a 3l resonant antenna is -

a) 3 b) 6 c) 2 d) 1

 

31. The electric field intensity of a Hertizian dipole at a remote point varies as

Ans. 1/r

 

32. Radiation resistance of a half wave folded dipole is

a) 72 W b) 144W c) 288 W d) 216W

 

33. When a carrier wave is modulated at 100% it?s power is increased by -

a)100% b)150 % c)50% d)0%

 

34. On a clear sky day, the atmospheric radio noise is strongest -

a) During morning hours

b) Around mid-day

c) During nights

d) In the afternoon

 

35. TV broadcasting system in India is as per CCIR -

a) System B

b) System I

c) System M

d) System X

 

36. For the safety measurement of the internal resistance of a 25-0-25 mA meter, a laboratory multimeter whose sensitivity is equal to -

a) 1k ohm/volt can be used

b) 10 k ohm/volt can be used

c) 100 k ohm/volt can be used

d) 200 k ohm/volt can be used

 

37. In order to measure moisture in wood the most suitable method is -

a) Electrical conduction

b) Electrical - capacitive

c) Absorption of radiation

d) Equilirium- moisture vs humidity

 

38. The flow rate of elctrically conducting liquid without any suspended practicle cannot be measured by

a) turbine flow meters

b) electromagnetic flow meters

c) ultrasonic flow meters

d) thermistor based heat loss flow meters

 

39. The most useful transducer for displacement sensing with excellent sensitivity, linearity and resolution is

a) an incremental encoder

b) an abosolute encoder

c) LVDT

d) a strain gauge

 

40. When variable reluctance type techometer has 150 teeth on the rotor & the counter records 13,500 pulses per second then the rotational speed will be-

a) 4800 rpm b) 5400 rpm c) 6000 rpm d) 7200 rpm.

 

41. On a voltage scale, zero dB m in a 600-ohm system could refer to

a) 1.732 V b) 1.0 V c) 0.7746 V d) 0.5V

 

42. One of the following devices which is required in addition in order to measure pressure using LVDT is

a) strain gauge b) pitot tube c) Bourden tube d) Rotameter

 

43. It is required to measure temperature in the range of 1300 deg C to 1500 deg C The most suitable thermocouple to be used as a transducer would be

a) chromel - constantan

b) Iron - constantan

c) chromel - alumel

d) platinum- rhodium

 

44. In a CSI if frequency of output voltage is f Hz, then frequency of input voltage to CSI is

a) f

b) 2 f

c) f/2

d) 3 f

 

46. Maximum value of charging resistance in an UJT is associated with-

a) peak point

b) valley point

c) any point between peak and valley

d) after the valley point

 

47. Thyristor A has rated gate current of 2A and thyristor B a rated gate current of 100 mA

a) A is a GTO and B is a conventional SCR

b) B is a GTO and A is a conventional SCR

c) B may operate as a transistor

d) none of the above

 

48. In a 3 phase full converter, the output voltage during overlap is equal to-

a) zero

b) source voltage

c) source voltage minus the inductance drop

d) average value of the conducting phase voltages

 

49. Mark old the correct statement for Cycloconverters

a) step-down Cycloconverter (CC) works on natural commutation

b) step up CC requires no forced commutation

c) load commutated CC works on line commutation

d) none of the above

 

50. In a 3 phase full converter if load current is I and ripple free, then average thyristor current is

Ans. b) 1/3(I)

 

51. In the RF amplifier stage cascade (CE-CB) amplifier is used because it gives

a) Large voltage gain

b) Low output impedance

c) Large isolation between the input and the output

d) None of the above

 

52. Silicon diode is less suited for low voltage rectifier operation because-

a) it can withstand high temperature

b) ensures low PIV of the diodes

c) ensures lower values of capacitance in the filter

d) reduces ripple content

 

53. An amplifier of class A is that in which

a) Base is biased to cut-off

b) Ic flows most of the time

c) Ie flows all the time

d) Vc often raises to Vcc

 

54. A transistor is in active region when-

a) Ib = bIc b) Ic=bIb c) Ic=Ie d) Ic=Ib

 

55. For coupling purposes in RF amplifier a buffer amplifier is used because it provides

a) Maximum loading and minimum mismatch

b) Minimum loading and minimum mismatch

c) Maximum loading and maximum mismatch

d) Minimum loading and maximum mismatch

 

56. A transistor has CE parameter as hie = 10kW, hre =20 x 10-4 , hse = 100, hoe = 25 ms. The hib for this transistor will be-

a) 100 W b) 99.01 W c) 5m W d) 101kW

 

57. An FM radio receiver is tuned to a 90.6 MHz broadcast station. It will receive an image frequency of

a) 110 MHz b) 112 Hz c) 114 MHz d) 120 MHz

 

 

60. A dc to dc converter having an efficiency of 80% is delivering 16W to a load) If the converter is generating an output of 200V from an input source of 20V, then the current drawn from the source will be

a) 0.1A b) 0.5A c) 1.0A d) 10.0A

 

BSNL GE-JTO Recruitment Examination Paper

 

1. When a inductive coil connected to a 200 V, 50Hz ac supply with 10A current flowing through it dissipates 1000 watts then which of the following will have least value in ohms

a.) Resistance b.) Reactance c.) Impedance d.) None

 

2. Oscillator crystal are made of

a.) Silicon b.) Germanium c.) Quartz d.) None

 

3. For small size, high frequency coils, the most common core material is-

a. )Air b. )Ferrite c.) Powdered ion d.) Steel

 

4. If we have a parallel plate capacitor of plate area 'A' and plate separatoin t and having a capacity C and a metallic plate r of area A and of negligible thickness is introduced in the capacitor at a distance from either of the two plates as shown in the given figure then the capacity of the capacitor will become

a.) b.) C c.) 2C d.) 4C

 

5. A superconductor is a

a.) A material showing perfect conductivity and Meissner effect below a critical temperature

b.) A conductor having zero resistance

c.) A perfect conductor with highest di-magnetic susceptibility

d.) A perfect conductor which becomes resistance when the current density through it exceeds a critical value

 

6. When an inductor tunes at 200 KHz with 624 pF capacitor and at 600 KHz with 60.4 pF capacitor then the self capacitance of the inductor would be

a) 8.05 pF b) 10.05pF c.) 16.01pF d.) 20.01pF

 

7. Sparking occur when a load is switched off because the circuit has high

a.) Inductance b.) Capacitance c.) Resistance d.) None

 

8. Sparking between contacts can be reduced by inserting a

a.) Resistance in the line

b.) Capacitor in series with contacts

c.) Capacitor in parallel with contacts

d.) None

 

9. RF amplifier of an A.M. receiver is normally biased in

a.) Class 'A' b.) Class 'b' c.) Class 'C' d.) None

 

10. The value of gate voltage for the operation of enhancement of only N channel MOSFET has to be

a.) High positive b.) High negative c.) Low positive d.) Zero

 

11. The input gate current of a FET is

a.) a few microamperes b.) negligibly small c.) a few milliamperes

d.) a few amperes

 

12. In the following fig. with R = 30k, the value of current through 2 K resistor is

a.) 25 mA b.) 40 mA c.) 25/16 mA d.) 10 mA

 

13. A step recovery diode

a.) has on extremely short recovery time

b.) conducts equally well in both directions

c.) is mainly used as a harmonic generator

d.) is an ideal rectifiers of high frequency signals

 

14. In order to get maximum undistorted output signal from CE amplifier with VCC 10V, the value of VCE (Q) should be approximately

a.) 0.1V b.) 5V c.) 10V d) V

 

15. In a FET the electrode, which corresponds to collector in bipolar transistor, is

a.) source b.) drain c.) gate d.) none

 

16. The device which acts like an NPN and a PNP transistor connected base to base and emitter to collector is

a.) Triac b.) UJT c.) Diac d.) SCR

 

17. A typical optical fibre has

a.) High refractive index core and low refractive index cladding

b.) Low refractive index core and high refractive index cladding

c.) Both a and b d.) None

 

18. In the following figure circuit diagram of an op-amp based is shown. The ratio is equal to

a.) 9 b.) 11 c.) 10 d.) 21

 

19. When a loud speaker is connected across the terminals A and B of the network shown in the fig. then its impedance to obtain maximum power dissipation in it will be

a.) 3 ? j1 b.) 3 + j9 c.) 7.5 + j 2.5 d.) 7.5 ? j 2.5

 

20. In the lattice network, the value of R for the maximum power transfer to the load

a.) 5 b.) 6.5 c.) 8 d.) 9

 

21. For a lossy transmission line short circuited at the receiving end, the input impedance is given by (Z0 is the characteristic impedance, ? is the propagation constant and l is the length of the line

a.) Z0 cot h ?l b.) Z0 cot ?l c.) Z0 tan h.? l d.) Z0 tan ?l

 

22. The approximate thickness of the radome wall should be

a.) l b.) l/4 c.) l/2 d.) l/8

 

23. A relatively permanent information is stored in

a.) ROM b.) RAM c.) PROM d.) Volatile memory

 

24. The rise time of the RC network shown in the given figure is approximately equal to

b.) RC c.) 2RC d.) 4RC

 

25. If in the network shown in the fig. initially a steady state is attained by closing the switch 's' and then if the switch is opened at t = 0, then the current i(t) through the inductor will be

a.) cos50tA b.) 2A c.) 2cos100tA d.) 2sin50tA

 

26. When the p network of figure ? I and T-network of figure ? II are equivalent then the values of R1, R2 and R3 will be respectively

a) 9W, 6W and 6W b.) 6W, 6W and 9W c.) 9W, 6W and 9W d.) 6W, 9W and 6W

 

27. When the impedance matrices of a two port networks are given by and , then if these two networks are connected in series then the impedance matrix of the resulting two-port network will be

d.) indeterminate

 

28. Joule/coulomb is the unit of

a.) Electric field potential b.) Potential c.) Charge d.) None

 

29. The electric field line and equipotential lines-

a.) Are parallel to each other

b.)Are one and same

c.) Cut each other orthogonally

d.)Can be inclined to each other at any angle

 

30. For a lossy transmission line short circuited at the receiving end, the input impedance is given by (When Z0 is the characteristic impendence g is the propagation constant and L is the length of the line

 

31. When two equal positive point charges are placed along X- axis at X1 and ?X1 respectively then the electric field vector at a point P on the positive Y-axis will be directed

a.) In the +x direction b.) In the ?x direction

c. ) In the +y direction d.) In the ?y direction

 

32. The directions of and in TEM mode transmission line with respect to the direction of propagation are

a.) Both and are transverse to the direction of propagation

b.) is and are transverse and h has a component in the direction of propagation

c.) is entirely transverse and has a component in the direction of propagation

d.) is entirely transverse and has a component in the direction of propagation

 

33. The lowest TM mode in a rectangular waveguide of cross ?section a x b with a>b will be

a.) TM01 b.)TE10 c.) TM112 d.)TE11

 

34. When a transmitter in a free space radiates a mean power of ?p? watts uniformly in all directions then at a distance d sufficiently far from the source in plane the electric field E should be related to p and d as

 

35. When a dipole antenna was radiating with some excitation in free space radiating a certain amount of the power v if then this antenna is immersed in a lake where water is non-dissipative but has a dielectric constant of 81, then the radiated power with the same excitation will be

a.) Decrease to finite non-zero value b.)Remain the same

c. )Increase d.)Decrease to zero

 

36. When a (75 ? j40)W load is connected to a coaxial line of Z0 = 75 W at 6MHz then the load matching on the line can be accomplished by connecting-

a.) A short ? circuited stub at the load

b.)An inductance at the load

c. )A short circuited stub at a specific distance from the load

d.)none of the above

 

37. As compared to analog multimeters, digital multimeters are ?

a.) less accurate b.) more accurate c.) equally accurate d.) none.

 

38. When a signal of 10 mV at 75 MHz is to be measured then which of the following instruments can be used

a.) VTVM b.) Cathode ray oscilloscope c.) Moving iron voltmeter

d.) Digital multimeter

 

39. Which of the following statement is true about two wattmeter method for power measurement in three phase current ?

a.) power can be measured using two wattmeter method only for star connected three phase circuits.

b.) when two meter show indentical readings, in the power factor is 0.5.

c.) when power factor is unit, one of the wattmeter reads zero

d.) when the reading of the two wattmeters are equal but of opposite sign, then the power factor is zero

 

40. When a capacitance transducer has two plates of area 5cm2 each, separated by an air gap of 2mm than the displacement sensitivity in pf/cm due to gap change would be

a.) 11.1 b.) 44.2 c.) 52.3 d.) 66.3

 

41. The Q of a radio coil

a.) is independent of frequency

b.) increases monotonically as frequency increases

c.) decreases monotonically as frequency increases

d.) increases upto a certain frequency and then decreases beyond that frequency

 

42. When a generator of internal impedance and operating at 1GHz feeds a load via a coaxial line of characteristic impedance 50 ohm then the voltage wave ratio on the feed line is

a.) 0.5 b.) 1.5 c.) 2.5 d.) 1.75

 

43. The coding system typically used in digital telemetry is

a.) PPM (pulse position modulation)

b.) PAM (pulse amplitude modulation)

c.) PCM (pulse code modulation)

d.) PDM (pulse duration modulation)

 

44. Radiation pyrometers are used for the measurement of temperature in the range of

a.) -2000C to 5000C b.) 00C to 5000C c.) 5000C to 12000C d.) 12000C to 25000C

 

45. In the given figure band structure is shown. It is of

a.) Gallium Avesenide (GaAs) b.) Silicon (Si) c.) Copper (Cu) d.) Germanium (Ge)

 

46. When anode is positive with respect to cathode in an SCR, the numbers of blocked p-n junction is

a.) 1 b.) 2 c.) 3 d.) 4

 

47. The circuit symbol for a GTO is

 

48. In the given fig. mark out the type of Cyclo converters

a.) 1 phase to 1 phase with continuous conduction

b.) 1 phase to 1 phase with discontinuous conduction

c.) step up device

d.) 3 phase to 1 phase device

 

49. In the given fig. A-1, C=5, m H and C=20 m F, C is initially charged to 200 V. After the switch.

S is closed at t = 0 the

maximum value of current and the

time at which it reaches this value are respectively.

a.) 400 A, 15.707 mS

b.) 50 A, 30 mS

c.) 100 A, 62.828 mS

d.) 400 A, 31.414 mS

 

50. In the given circuit the maximum current in the main SCR M can be

a.) 200 A b.) 170.7 A c.) 141.4 A d.) 70.7 A

 

51. The transfer function of an amplifier is given by

 

The high 3-db frequency of the amplifier will approximately

a.) 5850 KHZ b.)585 KHZ c.) 5850 HZ d.)585HZ

 

52. In comparison to full wave rectifier with two diodes the four divide bridge rectifier has the dominant advantage of

a). Higher current carrying

b.) Lower ripple factor

c.) Higher efficiency

d.) Lower peak increase voltage require

 

53. Power output increase in a class-c amplifier-

a.) If the conduction angle decrease

b). If the conduction angle increase

c.) Are not governed by the conduction angle

d.) None of the above

 

54. A transistor with hie = 1.5 k and hfe = 75 is used in an emitter follower circuit where R1 and R2 are used for normal biasing . Approximate value of it?s current amplification is

a.)75 b.)76 c.)75/76 d.)-75

 

55. Amplifier of class B has high theoretical efficiency of 78.5 percent because-

a.) It is biased almost to saturation

b.)Its quiescent current is low

c.)It?s output is an exact replica of it?s input

d.)It is biased well below cut off

 

56. The coupling that produces minimum interference with frequency response is

a.) Direct coupling b.)Impedance coupling

c.) R C coupling d.)Transformer coupling

 

57. In the circuit shown in the given figure Rf provides

a.) Current series feedback

b.) Current shunt feedback

c.) Voltage series feedback

d.) Voltage shunt feedback

 

58. Mark the correct relation for the junction transistor

 

59. Data in the serial form can be converted into parallel form by using ?

a.) PISO shift register

b.) SOIP shift register

c.) SIPO shift register

d.) POIS shift register

 

60. PROMs are used to store

a.) bulk information

b.) information to be accessed rarely

c.) sequence information

d.) relatively permanent information

 

61. The horizontal axis in a 3 bit unipolar D/A converter represents

a.) Output bit combination

b.) analog output voltage

c.) input bit combination

d.) none of the above

 

62. 'Not allowed' condition in NAND gate SR flip flop is

a.) s = 0, R = 0 b.) s = 1, R = 1 c.) s = 0, R = 1 d.) s = 1, R = 0

 

63. Name the fastest logic family

a) TTL b.) RTL c.) DCTL d.) ECL

 

64. Equation corresponding to De Morgan's theorem in Boolean Algebra is

a.) (A+B) (A+B) = AA + AB + BA + BB

c.) A + AB = A

d.) None of the above

 

65. In the given fig find radix of the system

a.) 2 b.) 4 c.) 6 d.) 8

 

66. Modems are used for data transmission telephone lines to

a.) increase the transmission capacity

b) improve noice performance

c.) incorporate error control coding

d.) eliminate dc component in the transmitted signal

 

67. The figure of a control system is shown. The maximum value of gain K for which the system is stable is

a.) b.) 3 c.) 4 d.) 5

 

68. Identify the example of open-loop system-

a.) A windscreen wiper b.) Aqualung

c.) Respiratory system of an animal

d.) A system for controlling Anti-rocket missiles.

 

69. Consider the following expressions indicating the step or impulse response of an initially relaxed control system

1. (5 ? 4e-2+) u(t)

2. (e-2t +5) (u(t))

3 .V(t) + 8e-2t u(t)

4 . V(t) + 4e-2t 4(t)

 

 

Those which correspond to the step and impulse response of the same system include

a.) 1&3 b.) 1&4 c.) 2&4 d.) 1&4

 

70. A system is described by

 

To test its stability by Lyapunov?s method the following V functions are considered.

 

Mark the most suitable V-function in this case-

a.) Only V1 b.) Only V2 c.) Both V1 and V2 d.) Neither V1 nor v2

 

BSNL JTO (Junior Telecom Officers) Previous Year Question Paper

 

When a piece of copper and another of germanium are cooled from room temperature to 800 K then the resistance of -

a) Each of them increases

b) Each of them decreases

c) Copper increases and germanium decreases

d) Copper decreases and germanium increases

 

 

When a signal of 10 mV at 75 MHz is to be measured then which of the following instrument can be used -

a) VTVM

b) Cathode ray oscilloscope

c) Moving iron voltmeter

d) Digital multimeter

 

 

When a sample of germanium and silicon having same impurity density are kept at room temperature then –

a) Both will have equal value of resistivity

b) Both will have equal value negative resistivity

c) Resistivity of germanium will be higher than that of silicon

d) Resistivity of silicon will be higher than that of germanium

 

 

When an RC driving point impedance function has zeros at s= -2 and s=-5 then the admissible poles for the function would be –

a) s = 0; s = -6

b) s = 0; s = -3

c) s = 0; s = -1

d) s = -3; s = -4

 

 

For the n-type semiconductor with n = Np and p = , the hole concentration will fall below the intrinsic value because some of the holes –

a) drop back to acceptor impurity states

b) drop to donor impurity states

c) Virtually leave the crystal

d) recombine with the electrons

 

 

The location of lighting arrestor is –

a) Near the transformer

b) Near the circuit breaker

c) Away from the transformer

d) None

 

 

Time constant of an RC circuit increases if the value of the resistance is –

a) Increased

b) Decreased

c) Neither a nor b

d) Both a and b

 

 

Telemetering is a method of –

a) Counting pulses sent over long distances

b) Transmitting pictures from one place to another

c) Transmitting information concerning a process over a distance

d) None

 

 

When the gauge factor of a strain gauge is 2, stress is 1050 kg/cm2, Y = 2.1´ 106 kg/cm2 and R is 100 ohms then the value of DR will be -

a) 2W

b) 3W

c) 4W

d) 1W

 

 

As the drain voltage is increased for a junction FET in the pinch off region then the drain current –

a) Becomes zero

b) Abruptly decreases

c) Abruptly increases

d) Remains constant

 

 

11. One of the following, which is not a transducer in the true sense, is –

a) Thermocouple

b) Piezoelectric pick up

c) Photo-Voltaic cell

d) LCD

 

 

When a transistor is required to match a 100W signal source with a high impedance output circuit then the connection that would be used is –

a) Common base

b) Common collector

c) Common emitter

d) Emitter follower

 

 

In a JFET gates are always –

a) forward biased

b) reverse biased

c) unbiased

d) none

 

 

The main factor which differentiate a DE MOSFET from an E only MOSFET is the absence of –

a) insulated gate

b) electrons

c) channel

d) P-N junction

 

 

An SCR conducts appreciable current when –

a) Anode and gate are both negative with respect to cathode

b) Anode and gate are both positive with respect to cathode

c) Anode is negative and gate is positive with respect to cathode

d) Gate is negative and anode is positive with respect to cathode

 

 

Silicon is not suitable for fabrication of light emitting diodes because it is -

a) An indirect band gap semiconductor

b) A direct band gap semiconductor

c) A wide band gap semiconductor

d) A narrow band gap semiconductor

 

 

An average responding rectifier type electronic ac voltmeter has its scale calibrated in terms of the rms value of a sine wave, when a square wave voltage of peak magnitude 100V is measured using this voltmeter then the reading indicated by the meter, will be –

a) 111V

b) 100V

c) 90.09V

d) 70.7V

 

 

When a four terminal T network is inserted between a source and load resistance as shown in figure then the resistance seen by the source remain the same with or without the four terminal block when R is –

a) 5W

b) 10 W

c) 15 W

d) 20 W

 

 

Which one of the following conditions for Z parameters would hold for a two port network containing linear bilateral passive circuit elements –

a) Z11 = Z22

b) Z12Z21 = Z11Z22

c) Z11Z12 = Z22Z21

d) Z12 = Z21

 

 

When the transmission parameters of the following network are A = C = 1, B = 2 and D = 3 then the value of Zin is –

a) 3W

b) 4W

 

 

While calculating Rth, constant current sources in the circuit are –

a) replaced by opens

b) replaced by ’shorts’

c) treated in parallel with other voltage sources

d) converted into equivalent voltage sources

 

 

Maxwell’s loop current method of solving electrical networks –

a) uses branch currents

b) utilizes kirchhoff’s voltage law

c) is confined to single-loop circuits

d) is a network reduction method

 

 

A transmission line of characteristic impedance Z0 = 50 ohms, phase velocity Vp = 2 x 108 m/s and length l = 1m is terminated by a load ZL= ( 30 – j 40 ) ohms. The input impedance of the line for a frequency of 100 MHz will be

a)(30 + j40 ) ohms

b)( 30 – j40 ) ohms

c)(50 + j40 ) ohms

d)(50 – j40 ) ohms

 

 

For an elliptically polarized wave incident on the interface of a dielectric at the Brewster angle then the reflected wave will be-

a) Elliptically polarized

b) Linearly polarized

c) Right circularly polarized

d) Left circularly polarized

 

 

A yagi antenna has a driven antenna-

a) Only

b) With a reflector

c) With one or more directors

d) With a reflector and one or more directors

 

 

The number of lobes on each side of a 3l resonant antenna is –

a) 3

b) 6

c) 2

d) 1

 

 

The electric field intensity of a Hertizian dipole at a remote point varies as -

Radiation resistance of a half wave folded dipole is -

a) 72 W

b) 144W

c) 288 W

d) 216W

 

 

When a carrier wave is modulated at 100% it’s power is increased by -

a)100%

b)150 %

c)50%

d)0%

 

 

On a clear sky day, the atmospheric radio noise is strongest -

a) During morning hours

b) Around mid-day

c) During nights

d) In the afternoon

 

 

TV broadcasting system in India is as per CCIR -

a) System B

b) System I

c) System M

d) System X

 

 

For the safety measurement of the internal resistance of a 25-0-25 mA meter, a laboratory multimeter whose sensitivity is equal to –

a) 1k ohm/volt can be used

b) 10 k ohm/volt can be used

c) 100 k ohm/volt can be used

d) 200 k ohm/volt can be used

 

 

In order to measure moisture in wood the most suitable method is –

a) Electrical conduction

b) Electrical – capacitive

c) Absorption of radiation

d) Equilirium- moisture vs humidity

 

 

The flow rate of electrically conducting liquid without any suspended particle cannot be measured by –

a) turbine flow meters

b) electromagnetic flow meters

c) ultrasonic flow meters

d) thermistor based heat loss flow meters

 

 

The most useful transducer for displacement sensing with excellent sensitivity, linearity and resolution is –

a) an incremental encoder

b) an abosolute encoder

c) LVDT

d) a strain gauge

 

 

When variable reluctance type tachometer has 150 teeth on the rotor & the counter records 13,500 pulses per second then the rotational speed will be–

a) 4800 rpm

b) 5400 rpm

c) 6000 rpm

d) 7200 rpm.

 

 

41. On a voltage scale, zero dB m in a 600-ohm system could refer to –

a) 1.732 V

b) 1.0 V

c) 0.7746 V

d) 0.5V

 

 

One of the following devices which is required in addition in order to measure pressure using LVDT is-

a) strain gauge

b) pitot tube

c) Bourden tube

d) Rotameter

 

 

It is required to measure temperature in the range of 13000 C to 15000 c) The most suitable thermocouple to be used as a transducer would be –

a) chromel - constantan

b) Iron - constantan

c) chromel - alumel

d) platinum- rhodium

 

 

In a CSI if frequency of output voltage is f Hz, then frequency of input voltage to CSI is-

a) f

b) 2 f

c) f/2

d) 3 f

 

 

Identify the type of chipper in the given circuit

a) Type A chopper

b) Type B chopper

c) Type C chopper

d) Type D chopper

 

 

Maximum value of charging resistance in an UJT is associated with-

a) peak point

b) valley point

c) any point between peak and valley

d) after the valley point

 

 

Thyristor A has rated gate current of 2A and thyristor B a rated gate current of 100 mA-

a) A is a GTO and B is a conventional SCR

b) B is a GTO and A is a conventional SCR

c) B may operate as a transistor

d) none of the above

 

 

In a 3 phase full converter, the output voltage during overlap is equal to-

a) zero

b) source voltage

c) source voltage minus the inductance drop

d) average value of the conducting phase voltages

 

 

Mark old the correct statement for Cycloconverters-

a) step-down Cycloconverter (CC) works on natural commutation

b) step up CC requires no forced commutation

c) load commutated CC works on line commutation

d) none of the above

 

 

In the RF amplifier stage cascade (CE-CB) amplifier is used because it gives-

a) Large voltage gain

b) Low output impedance

c) Large isolation between the input and the output

d) None of the above

 

 

Silicon diode is less suited for low voltage rectifier operation because-

a) it can withstand high temperature

b) ensures low PIV of the diodes

c) ensures lower values of capacitance in the filter

d) reduces ripple content

 

 

An amplifier of class A is that in which -

a) Base is biased to cut – off

b) Ic flows most of the time

c) Ie flows all the time

d) Vc often raises to Vcc

 

 

A transistor is in active region when-

a) IB = bIC

b) IC=bIB

c) IC=IE

d) IC=IB

 

 

For coupling purposes in RF amplifier a buffer amplifier is used because it provides-

a) Maximum loading and minimum mismatch

b) Minimum loading and minimum mismatch

c) Maximum loading and maximum mismatch

d) Minimum loading and maximum mismatch

 

 

A transistor has CE parameter as hie = 10kW, hre =20 x 10-4 , hse = 100, hoe = 25 ms. The hib for this transistor will be-

a) 100 W

b) 99.01 W

c) 5m W

d) 101kW

 

 

An FM radio receiver is tuned to a 90.6 MHz broadcast station. It will receive an image frequency of -

a) 110 MHz

b) 112 Hz

c) 114 MHz

d) 120 MHz

 

 

In the given fig RL is shorted out, then VCE will become-

a) OV

b) VCC – IBRB

c) Equal to VCC

d) None of the above

 

 

See the circuit shown and choose the correct option –

a) Only red will glow

b) Only green will glow

c) Both red and green will glow

d) Neither red nor green will glow

 

 

A dc to dc converter having an efficiency of 80% is delivering 16W to a load) If the converter is generating an output of 200V from an input source of 20V, then the current drawn from the source will be –

a) 0.1A

b) 0.5A

c) 1.0A

d) 10.0A

 

 

A transistor is operated as a non-saturated switch to eliminate –

a) storage time

b) turn – off time

c) turn – on time

d) delay time

 

 

The output Y of the circuit in the given figure is –

a) (A + B)C + DE

b) AB + C(D + E)

c) (A + B)C + D + E

d) (AB + C) . DE

 

 

Rotors used in a two-phase ac servomotor is –

a) solid iron motor

b) squirrel cage rotor

c) drag cup rotor

d) both b and c

 

 

Major advantage of TWT over a klystron lies in its –

a) higher bandwidth

b) higher output

c) higher frequency

d) higher gain

 

 

The op-map circuit shown in the given figure can be used for –

a) addition

b) subtraction

c) both addition and subtraction

d) multiplication

 

 

The Boolean expression for the shaded area in the given Venn diagram is –

A lag compensator is basically a –

a) high pass filter

b) band pass filter

c) low pass filter

d) band elimination filter

 

 

Transfer function T (S) of the system in the given fig is-

The overall transfer function for a unity feedback system is

Mark the correct statement regarding this system

1. Position error constant kp for the system is 4

2. The system type one.

 

 

3. The velocity error constant kv for the system is finite.

Select the correct answer using the codes given below- Codes

a) 1,2 and 3

b) 1 and 2

c) 2 and 3

d) 1 and 3

 

 

If the rotor’s resistance and reactant’s are respectively R and X1 its length and diameter are L and D for two phase a) c) servomotor, then-

In a PID controllers the transfer function G(s) is-

Transfer function can be approximated by the system- The transfer function of an amplifier is given by The high 3 db frequency of an amplifier will be approximately-

a) 5850 kHz

b) 585 kHz

c) 5850 Hz

d) 585 Hz

 

 

An open loop transfer function is given by Its – loci will be-

The output signals amplitudes for 1’s and 0’s in an ADM transmission systems are –

a) Fixed and the repetition rate is also fixed

b) Fixed but the repetition rate is variable

c) Variable and the repetition rate is also variable

d) Variable but the repetition rate is fixed

 

 

Microwave link repeaters are typically 50km apart –

a) Because of atmospheric attenuation

b) Because of Output tube power limitations

c) Because of the earth’s curvature

d) To ensure that the applied ac voltage is not excessive

 

 

The amplifier inserted at intervals to amplify the signal and compensate for transmission loss on the cable are called-

a) line amplifier

b) equalizing amplifiers

c) compradors

d) repeaters.

 

 

Diversity reception in used to-

a) increase receiver sensitivity

b) improve receiver selectivity

c) overcome degrading effect of fading

d) overcome degrading effect of receiver detuning

 

 

Mark out transferred electron device in the following-

a) BARITT dived

b) IMPATT dived

c) Gunn divde

d) Step recovery diode

 

 

In the output of a normal monochrome receiver video detector voltages, which are not found, are -

a) syne

b) video

c) sweep

d) sound

 

 

The HV anode supply for the picture tube of TV receiver is generated in the-

a) mains transformer

b) vertical output stage

c) horizontal output stage

d) horizontal deflection oscillator

 

 

In antenna measurements using two aperture antennas of dimensions D1 and D2 , minimum separation between the two should be (x is free space wavelength of radiation uses) The frquency range for satellite broad casting is –

a) 30 MHz – 300MHz

b) 30 MHz – 3 GHz

c) 3 GHz – 30 GHz

d) 30 GHz – 300 GHz

 

 

Iris is used to –

a) Over come power loss

b) Over come bending effect

c) Over come mismatch error

d) Over come twist effect

 

 

In schotty barrier diode current flows because of –

a) Majority carriers

b) Minority carriers

c) Majority and minority carriers

d) None

 

 

Which antennas are used in microwave communication –

a) long wave antennas

b) Rhombic antennas

c) Parabolaidal antennas

d) All of above

 

 

Among translator & time of sight system capacity –

a) Of translator is more

b) Of line of sight is more

c) Having equal capacity

d) No relation such as

 

 

No of T-state required for memory read or write operation-

a) 2

b) 3

c) 4

d) 6

 

 

In data transfer operation which flag get affected-

a) 3140 flog.

b) carry flog

c) sign flog.

d) none

 

 

The storage and retrieval of data on stacks should follow sequence-

a) last in first out

b) first in first out

c) random in random out

d) none

 

 

While executing program microprocessor checks INTR line clearing-

a) each instruction

b) after interval of two instruction

c) after a subroutine

d) at the end of program.

 

 

93. In which error check technique of data communication 2’s complement of all bytes of data is transmitted with data-

a) Even parity

b) odd parity

c) check scans

d) cyclic redundancy

 

 

Program execution hierarchy decides which operator-

a) is most important

b) is used first

c) is fastest

d) operators on largest number

 

 

(375)10 = (—-)8

a) 550

b) 557

c) 567

d) 577

 

 

To obtain 2048 8 memory using 128 8 memory chip how many IC required-

a) 2

b) 4

c) 8

d) 16

 

 

A Decimal no. 17 can be converted in binary, the binary no. will be.-

a) 10001

b) 01110

c)00111

d) 11100

 

 

Is the Universal logic gate-

a) AND

b) OR

c) NAND

d) X-OR

 

 

A monostable state in multivibrator means-

a) which returns itself to its single stable state

b) the state used only once in circuit

c) the state of circuit can not get changed

d) the state of circuit always changing

 

 

For designing binary counter which flip flop is preferred -

a) T FF

b) SR FF

c) D FF

d) JKFF

 

 

His handwriting was not —– so I could not read his note –

a) attractive

b) eligible

c) clear

d) legible

 

 

They started to —– people into the theatre only at six -

a) enter

b) admit

c) follow

d) accept

 

 

I told him to buy things that are lasting (Give the appropriate synonym of the underlined word).

a) ending

b) ordinary

c) durable

d) cheap

 

 

Give the word which is most opposite in meaning of the word ‘evident’-

a) doubtful

b) unimportant

c) disagreed

d) understood

 

 

I expressed by disagreement —— him on that issue-

a) between

b) with

c) about

d) for

 

 

‘Sugarbowl’ of the world is -

a) India

b) Cuba

c) Brazil

d) USA

 

 

Palk strait separates-

a) India and Srilanka

b) India and Burma

c) Britain and France

d) Malaysia and Sumatra

 

 

The minimum number of atoms in a molecule of an element are-

a) 1

b) 5

c) 2

d) 10

 

 

Tides in the sea are caused by-

a) Effect of sun

b) Effect of moon

c) combined effect of moon and sun

d) Gravitational, centrifugal and centripetal forces

 

 

The Bar council of India decided to close over law colleges across the country for their failure to maintain minimum teaching standard) There number is

a) 140

b) 200

c) 150

d) 100

 

 

Aswan Dam is located in-

a) Egypt

b) Libya

c) Sudan

d) Iran

 

 

Ghana Birds sanctuary is in the state of -

a) Rajasthan

b) Madhya Pradesh

c)Uttar Pradesh

d) Maharashtra

 

 

Dry ice is-

a) Frozen carbon monoxide

b) Frozen carbon dioxide

c) Frozen ammonia

d) None of these

 

 

East flower river of India is -

a) Cauvery

b) sone

c) Narmada

d) Tapti

 

 

The total length of the great wall of China is –

a) 1,400 miles

b) 1,500 miles

c) 1,300 miles

d) 1,400 miles

 

 

Deficiency of vitamin C may result in-

a) beriberi

b) night blindness

c) dermatitis

d) Scurvy

 

 

Bharat Shah a film financer was granted bail by Supreme Court after a

period of –

a) 11 months

b) 2 years

c) 18 months

d) 15 months

 

 

Indian local time is based on-

a) 800 E longitude

b) E longitude

c) 1100 E longitude

d) 250 E longitude

 

 

The two days Shiv Shena Mahashivir of 2002 started at Shirdi on –

a) 9th April 2002

b) 10th April 2002

c) 8th April 2002

d) 11th April 2002

 

 

Which one is a good preservative of food?

a) Spirit

b) Formaldehyde

c) Sugar

 

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