Q- centrifugal pump will typically give you a low flow rate at a lower pressure, where a piston pump will give you more pressure and higher flow rate. Is the statement correct?
C. First Sentence is right. Second one is wrong
D. I Don't know
Q- Why are large centrifugal pumps started with their discharge valves closed?
A. To ensure proper priming
B. To limit sudden rise in discharge rate
C. To limit motor starting current
D. To minimize starting torque on motor shaft
Answer-C and D
Q- Which of the following problems occurring in a hydraulic system can be caused by the use of an oil having a viscosity lower than specified?
•a Seal deterioration
•b Fast response and hunting
•c Increased power consumption
•d Oil film breakdown
Q- The suction pressure gauge of the Engine room bilge pump is broken and you don’t have a spare. Chief Engineer has asked you to troubleshoot the problem with Bilge pump not taking suction from Fwd (P) bilge well. You try taking suction from Fwd (S) & Aft Bilge well and find that pump is taking good suction. Thereafter you try suction from Fwd. (P) bilge well for sometime after priming with Sea Water but there is no change in level. You inspect the suction filter of the pump and find that it is very difficult to remove the same, you had to apply too much of force to lift the filter cover while normally it comes out easily. What does it indicate?
A. It does not indicate anything, sometimes the filter covers are difficult to remove.
B. It indicates that the suction valve of the Fwd. Bilge Pump is leaking
C. It indicates that the suction filter of the Fwd. (P) bilge well is clogged completely
D. Pump suction filter might be clogged
Q- Sludge pump suction pressure is going full vacuum when you start the pump taking water of double bottom tank suction you have checked the suction filter n found in clean condition. Taking suction from fuel oil sludge tank does not happen. Causes of the problem.
A) Pump is not working efficiently n reqd. overhauling
B) FO sludge tank suction valve is leaking
C) W.O. tank D.B. tank suction pipeline has a blockage.
D) Cant say what is the problem but definitely the pump needs to be opened up for overhaul
Q- The overspeeding of the diesel engine driving an electric generator could cause
A. low voltage trip to trip
B. reverse power trip to trip
C. damage to windings
D. excessive exhaust temperatures
Answer-CMarine Aux 2011 Objective Question