Telco Papers Pattern (Aptitude & Technical)




TELCO Paper Follows:


 1.Ratio of speed of camshaft to crankshaft in  4-stroke engine?

  (a)1:2 (b)2:1 (c)1:4 (d)4:1 change the dir. of rotation of 3 phase  induction moterwe have  to change?



 3.why we make initially star-connection then  delta-connection?  4.H8/f8 shows?

  (a)clearence fit (b)shrink fit (c)interference fit


 5.centipoise is the unit of?

  (a)hardness (b) viscosity


 6.brinnel no. is the unit of?

  (a)hardness (b) viscosity


 7. hardness is?

  (a)resistance to deform    (b)resistance to machining    (c)resistance to abbration


 8.moudoulus of elasticity of mild steel?

  (a)2.2*(10**6) (b)3*(10**6) (c)2.2*(10**5) of friction for mild steel & cast  iron?

  (a).3 (b).1 (c).01 (d).5 vechile cluch is used between? metric thread the angle is?

  (a)45 (b)55 (c)30 lathe(lead screw) the thread is used is?

  (a)BSW (b)square


 13.idler pully is used?

  (a)low load,high speed (b)high load low speed which operation tool rotates and work piece  moves  linearly?

  (a) milling (b)turning


 15.broaching is the process of?

(a)finishing hole (b)making hole (c)splines (d)keyway


 16.nitriding is?

  (a)harden core (b)harden surface (c)soften  surface sumerged arc welding why filler is kept in the  molten  material?\   ans-to prevent oxydising the upper surface


 18.the thermal efficiency of C.I engine?

  (a)ans-around 30% (B)around 15% C.I engine after compression stroke?

  (a)ans-only fule is injected (b)mixture is  injected   (c)air is injected


 20.twist drill is specified by?

  (a)flute& dia (b)twist angle&dia


 21.the reduction speed ratio of spur gear is?

  (a)20:1 (b)2:1 (c)


 22.luminious is unit of? 




 23.carbide tool is used for?

(a)high speed (b)low speed (c)all speed (d)  medium speed


 24.+ve back rake is used for?

  (a)Al (b)mild steel (d)cast iron



 25.acid rain occurs due to this exhaust from C.I  engine?

  (a)sulpher (b)CO


 26.which machin is rested support?

  (a)milling (b)shaper


 27.anmneling is used for?

  (a)softening (b)remove stress cantilever beam if force is increased an non  supported end  chance of failure is?

  (a)anywhere (b)middle (c)near wall side simple supported beam when force is acting at  middle, max.  deflection is??


 30.surge pump is used in pipe line for??


 31.E=2000kg/mm*2, stress=200 kg/cm*2, length  l=200mm, dia.=40mm  then channge in length=? two gear system moudle,teeth of one gear,speed  of both gear  is have to calculate center distance?


 33.the thickness of mild steel is given,you have to  create a  hole(dia. is given,speed of something is  given=22m/ have to  calculate another speed perhaps cutting speed in  rpm.??


 34.3 coplanner fore are ,angle betwwen P & R is 90.P  & Q is  120.if  Q=20 then.P=?


 35.two of same mass.first is inside the water by 1/2  volume other  by  2/3 volume.what is ratio of their densities?





Tech paper (M. Tech)


1)Youngs modulus of mild steel  2.2* 10^6kg/cm2


2)rod of dia(given)length(given)subjected to stress(given) and "E"(given). what is increase in length.  0.2cm



3)centipose is unit of...........  viscosity



4)hardness is measured in  brinell no.



5)steady rest is used in.......  i) milling ii)lathe (2 more option)

ans- lathe


6)rotating cutter and sliding w/p(process is)





7)maxm deflection of beam supported at  two ends and loaded at centre


8)cantilever beam failure occurs at ......  support


9)what type of fit is H9f9

  i)interference fit

ii)shrink fit...etc.


10)surface finish is represented by....



iii)rectangle ....none of these


11)broaching is done to produce....

  i)internal keyway

ii)splines...(2 more options)


12)twist drill is specified by

  i)lip angle,dia

  ii)lip angle , material,dia

  iii)dia ,shank, material



13)in diesel engine.. injection occurs ..

  i)20degree btdc

  ii)20 degree atdc

  iii)12 degree atdc...


14)in 4-stroke engine ratio of cam shaft and crank shaft rotation i)1:2 ii)2:1 ....etc


15)two gears at 100 rpm and other 300 rpm....driven has m=4 and no. of teeth 60  distance b/w centre is....


16)reduction ratio ofspur gear

  i)1:4 ii) 1:20 iii)1:10.....


17)cemented carbide tool is used at..... low , medium , high or all speed


18)hardness signify....resistence to.  scratching machining  etc



19)coefficient of friction between cast iron and mild steel....

  i)0.2    ii) 0.3     ii) 0.001 etc.


20)in SAW arc is struck under flux

  i)to prevent oxidation..(3 more options)


21)which test is used for non ferrous material weld... magnetic particle test


22)clutch is located between..... engine and gear box


23)thermal efficiency of diesel engine is....

  i)less than 20%     ii)less than 30%...etc



24)in CI engine injection takes place ...  at the end of compression stroke



25)clearence volume(given)...suction volume(given)  what is compression ratio.



26)what type of sress is hertz stress.

  i)tensile ii) shear iii)contact....


27)two helical spring is arranged in parallel ...the stiffness is ans- sum of stiffness


28)99% tolerance is

  ans- < 3* (sigma)


29)two cube is half submerged and other is 2/3 submerged ?.  Ratio of their densities?.

Ans -3:4


30)for ammonia HP per tonn of refrigeration


31) model of pump of 20 HP ?.rotates at 400 rpm (head is 20m)  find out speed when head is 60 m( given model dia is ? of original)



Telco Papers Pattern (Technical & Aptitude)






(Answers are written in brackets)



1)Rating of 3phase domestic supply(440v,50 Hz.)


2)What is pulse width modulation


3)Use of 8279 chip


4)Which of these is used as interface with IBM pc(RS232)


5)A circuit was given and was asked to find current through 10 ohm resistor(0A as it was a balanced wheatstone circuit)


6)which of these material is widely used in IC fabrication(silicon)


7)which one is measured by moving coil(rms value,check the answer----not sure)


8)forward bias voltage drop across LED(1.4v)


9)true rms value is find for(answer is either sinusoidal or periodic-----see it)


10)auxillary carry is used for(BCD arithmatic)


11)power factor is improved by(synchronous motor)


12)Which connection is used for industrial application(3phase star connection)


13)a circuit was given series rlc circuit, to find whether it is leading or lagging(leading)


14)method used for PCB fabrication(grinding)


15)transfer function was given, to find the phase shift(0 as the no. of zeroes were equal to no. of poles=2)


16)which motor has starting torque(series)


17)which motor is used for lathe(squirrelcage induction motor------ but check about stepper motor also)


18)which of these cannot be done in transformer(frequency conversion)


19)distribution transformer load is connected in(star)


20)which line is used for fax(telephone line)


21)why multiplexing of address and data bus is done(less numbr. of pins)


22)which of these method is not used for finging stability of system(shemann method)


23)maximum value that can be displaced by 3 1/2 LED(1999)



24)supply voltage changed from v to v/2 then change in speed, means find speed corresponding to v/2 voltage,given speed corresponding to v voltage for motor


25)if emf induced from Eb1 to Eb2 then change in speed of motor


26)to find the openloop transfer function of a system figure was given which had feedback(there seems some error in question so we find the closedloop transfer function,








2.A square is inscribed in a circle , radius of the circle is 'a'.Area of the square=



3.The angle of a triangle is 1:2:2 then the triangleis




4.X's salary is 150% of Y, and Z's salary is 75% of Y, their total salary is




5.g[x]=1+x/2, then value of g[2x] in terms of g[x] is


6.If X<Y ,which of the following is greater than X and less than Y




7. For the sequence 4,8,6,18,15,.....,the next number is find the relationship between X & Y for the given value




9.(X*) is the largest integer but less than X.find the value of (5.2*) + (4*)-(2*)=?




10. Series of An is given by (An-1)^3,if first value of An is 1 find the series up to four steps




11.Simple questions based time and distance


12.In a city 90% people has car, 15% has motorcycle, 100% has car or motorcycle then how many of them have only car and motorcycle.


13.Two problems are based upon coding


14.There was a short passage giving clue of sequence of different items eg. lathe , compressor... Six problems are based upon their positions (reasoning)


15.One reading comprehension was given of which atleast 7 to 8 questions were asked.


There are two sections each containg 40 questions.One arthematic  and another is reasoning. In arthematic 11 are data sufficiency and 8 are  anology.In reasoning all are puzzle type. Probably he rejects very few from test , since after that GD follows. Any I am sending some q's as for as my rememberance.




1) Hypothesis :problem (below 4 he will give)


2) Mirror:Image












8)1/3,1 1/3,3,5 1/3, next


9)Selling price of 4 articles=Cost price of 3 articles then %loss(ans. 25%)


10)|x-3|=3-x then x=


11)data sufficiency p>q?

1)p,q positive


This type you can see in GMAT book.




1) ABCDEF attended for an interview, in which 3 were selected A is worst of the lot C got equal marks as F(C=F)  D<F and G E is not selected   B>C

There are 5 questions below this.


2)There are 7 fellows sat in the following way C and F always sit as a apart as follows No. of fellows sat b/w c and D and D and F are equal like that he has given

Ans: Order is as follows C E B D A G F by using this you can answer all



About 4 to 5 are there


3)ABCDE are five brothers. There are twins(only one pair of equal age) both are neither younger nor older. D is younger to 3 brothers. B is older than E and C. q's like who is youngest? Eldest ? About 4 are there.



4)A person has meet a king for that ha has to cross 7 gates. At each gate he  has to pay half the amount he is carrying. Finally he gave Rs 3/- to the  king. Then the amount he carried at the beginning and some questions  (about 5)like that.


5) Heros tell truth and cowards lie.There PQR three persons. P tells Q "I  may be hero or I may be coward". Q tells R "P was telling that he was  coward. Then R tells Q "P was not a coward but he was a hero". You better  study the question it may not be entirely correct. In thus 3 q"s are there


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