- Q- Which of the following conditions can develop if a valve with a badly scored valve stem is repacked?
a)the valve disc will crack
b)leaking and premature failure of the packing
c)the valve disc will become eroded
d)the valve seat will sustain damage due to fretting
Answer-B
- Q- You have a two stage centrifugal pump, with both stages in parallel configuration. after dismantling the pump you realize that you forgot to the marking and both impellers are identical.both the impellers are single entry type and the eye of both the impellers will come in opposite direction what are you going to do?
a. since marking was forgotten, so we need not worry, any impeller can come in any place as they are identical
b. any impeller can come in any place, but the phase sequence of the electrical motor driving the pump may have to be reversed, if impellers have exchanged places
c. you have to find out the right placement of the right impeller with respect to the direction of rotation or by looking at the volute casing
Answer-C
- Q- If two centrifugal pumps, driven by two independent electric motors, operating at unequal speeds are discharging an inflammable liquid through a common discharge line, the higher speed pump may cause the slower pump to
a)stop
b)turn backward
c)overheat
d)overspeed the driving end
Answer-C
- Q- When there is excessive ingress of water in the engine room onboard causing dangerous levels of bilge water,
A.Start oily water separator and pump overboard
B.Start General service pump and pump bilges overboard
C.Use bilge injection valve and pump bilges overboard
D.None of the above
- Q- Which of the following is the material used for manufacturing tube plates of a shell and tube type heat exchanger?
A. Cupro-nickel
B. Aluminum Brass
C. Admiralty Brass
D. Gunmetal
Answer-C
- Q- which of the following valve is liable to open or close under pressure of fluid,if not locked in position?
A.gate valve,
B.globe valve,
C.plug valve,
D.butterfly valve
Answer-D
- Q- During prolonged astern manoeuvring of the relative expansion between any of the turbine its casing is likely to increase for an alarming level you should (multi choice) in photo no3 in download
A) Inform the bridge that no further manoeuvring is possible as the turbine are likely to be damaged
B) Reduce the vacuum further to control the relative expansion
C) Keep manoeuvring irrespective of damage to the turbines
D) Request the bridge to try to reduce number of astern movements
Answer-D
- Q- You must have worked with mooring winch and windlass hydraulic systems. The cooling of hydraulic oil for the above system on large merchant ships is provided by:
A. There is no cooling arrangement as the system doesnt require cooling
B. Air cooled hydraulic reservoir
C. Water cooled plate or shell type heat exchangers
D. Radiator and fan arrangement Answer-C
- Q- Gudgeonpin bearings are difficult to lubricate because of their oscillating motion and__________
A. Their free- floating design
B. Their relatively small size
C. The reciprocating motion of the piston
D. Their position in the lubrication system
Answer-D
- Q- The purpose of an air cooler in a supercharging system is to :
A. Reduce temperature of supercharged air in order to condense and remove maximum possible moisture from the air prior entry to the engine
B. Reduce the temperature of the supercharged air in order to increase the density & also to cool down below dew point to remove moisture from air prior entry to the engine
C. Cool supercharged air to increase its density such that the dew point is not reached to avoid entry of moisture into the engine
D. Cool supercharged air to increase its density and also to keep the peak temperature and exhaust gas temperature within limits
Answer-C
- Q- Which of the following can lead to premature failure of roller bearings?
A. Misalignment
B. Contamination
C. Shrinkage
D. Over greasing
Answer-A,B and D
- Q- When may the crankcase ventilation pipes or oil drain pipes of two or more engines be connected?
A. Propulsion engines under 1000 shaft horsepower may share a common crankcase vent provided the oil drains remain separate
B. In most cases it is desirable and cost effective for propulsion engines to share a common crankcase ventilation and monitoring system
C. No interconnection may be made between the crank case ventilation pipes or oil drain pipes
Answer-C
- Q- you are pumping out sludge to a shore facility using your sludge pump. you find that the discharge rate of pump is very slow and suction filter is getting clogged frequently.what is the best alternative to counteract the problem?
• a.remove the pump suction filter and pump out the tank
• b. increase the tank temperature, keep an eye on the pump suction pressure and clean the filter as soon as it drops
• c. as soon as the as the shore facility tells you that they are not receiving any sludge, you stop the pump and clean the filter
• d. fabricate a bigger mesh size suction filter and use in place of normal filter so that frequency of filter blockage is reduced and you can get a better discharge rate
Answer-B
- Q- Double entry impellers have a distinct advantage over single entry impeller. What is it?
A. They balance out the axial thrust
B. It gives a higher pumping efficiency
C. It is cheaper and easier to manufacture
D. The need of installing line bearing onto the pump shaft is eliminated
Answer-A
- Q- What prevents rotation and fretting between a thin shell bearing and its housing ?
A. Location tangs or pegs
B. The nip or crush of the bearing
C. A special kind of adhesive
D. Any of the above
Answer-B
- Q- Clearance volume scavenging in a turbocharged,four-stroke/cycle diesel engine is accomplished
A. during the valve overlap period
B. with only the exhaust valve open
C. at a pressure below atmospheric
D. without cooling the cylinders or pistons
Answer-A
- Q- You are responsible for daily transfers of engine room bilges. U follow the sequences aft –fwd (P)-fwd(s) bilge well n u have never experienced a problem but 5/E started the transfer n first transferred forward (s) bilge well n without any problem n u join him later u find that bilge pump is not taking suction fr f(p) n aft bilge well n then u have checked everything is normal. What is the cause?
A) 5th engineer made a mistake by 1st transferring the fwd (s) bilge well, normal sequence of operation for engine room machineries should not b disturbed.
B) fwd (s) Bilge well suction valve is leaking
C) Bilge pump suction filter cover gasket is leaking.
D) Fwd (s) Bilge well suction filter cover gasket is leaking
Answer-B
- Q- An emergency diesel generator cooling system is equipped with an automotive type thermostat. If the thermostat bellows loses its charge, the thermostat will
a)open, and the coolant temperature will increase
b)open, and the coolant temperature will decrease
c)close, and the engine coolant temperature will increase
d)close, and the coolant temperature will decrease
Answer-C
- Q- The turbocharger (constant pressure) is making "whoofing" noises. What might be the cause?
A Heavy seas from behind.
B A faulty turbocharger bearing.
C One or more leaking exhaust-valve(s).
D Strong current against
- Q- In case of failure of the control system of a centrifuge, the correct sequence for manually desludging a purifier would be-
A. Stop feed-give sealing water-close sealing water –shut operating water-open and close desludging water quickly
B. Stop feed- shut operating water-open and close desludging water quickly
C. Shut operating water-stop feed- open sealing water for a short time then close-open and close desludging water quickly
D. Shut operating water- stop feed- open and close desludging water quickly
Answer-A
- Q- Centrifugal pump change over for pumping liquid of high specific gravity the discharge at the rated capacity will be
a. Increase
b. Decrease
c. Same
d. Convert 50%
Answer-C
Q- screw pump generally?
a. slow speed
b. high
c. medium
d. all.
Answer-A (But in some cases it is medium speed also)
- Q- The type of corrosion normally occurring in cooling Fresh Water systems of Marine Diesel Engines is :
A. Stress corrosion
B. Hot corrosion
C. Bimetallic corrosion
D. Selective Phase corrosion
Answer-D
- Q- Normally so called??? Single screw pumps??? Are used as sludge pumps in engine room. What is correct technical name of these pumps?
e) Snake pump
f) Screw pump
g) Progressive cavity pump
h) Gerotor pump or gyrator pump
Answer-G
- Q- which of the not self actuating valve.
a. check valve
b. relief
c. ball
d. safety.
Answer-C
- Q)During cleaning of the sea water suction filter, it was found that at some places the mesh size has increased either due to corrosion or due to mechanical Damage. What action is required?
A. No action is required, it is quite normal for sea water filters to get corroded and it will not effect the pump in anyway
B. Keep the pump which is having corroded filter on standby use while keep using the other pump. Meanwhile order for the new filter
C. The pump can be run without filter for a short time, while the filter is being repaired
D. Permanent repairs to the filters should be carried out before putting it into service, or it should be replaced with good spare filter
Answer-D
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