Q- The cylinders and intercoolers of most low pressure air compressors are cooled by _____________.
A. water
B. oil
C. air
D. CO2
Answer-B
Q- The effect of excessive tappet clearance in 4 stroke auxillary engine-
A. Increased engine efficiency as expansion can take place for a longer duration and less energy wasted with the exhaust gases
B. Valve hammering, change in timing of exhaust with more side thurst causing greater wear between stem and bush
C. Loss in compression, poor combustion, improper mixing of fuel & air and gas gas leakage due to improper closing of valve
D. Turbocharger surging, loss of rotation of valve spindle and high exhaust temperatures
Answer-B
Q- Sequential starting of machineries after black out in engine room is necessary
A. To prevent overload of Generators
B. To quickly restore the failed power supply in order
C. To prevent damage to machinery which has been switched off
D. All of the above
Answer-A (because sequential starting is to prevent generator from overloading it has nothing to do with damage with machinery. it just starts the machinery in sequence which are needed first... preference... else bcouse if all r started once all the load will come on generator and it will get trip... as starting current is high for motors)
Q- Most steam traps respond well to cleaning. But when a thermodynamic trap fails to operate after cleaning, the next course of action should be:
A. Throttle the steam outlet valve
B. Renew the trap
C. Lap the disc and the seat of the trap
D. Throttle the steam inlet valve
Answer-C
Q- Over greasing Which of the following is NOT a true statement?
A. Butterfly valves are used for modulating flow and can be throttled
B. Globe Valves can be straight flow or angle flow type
C. Swing check valve will provide lesser resistance than same bore diameter globe type check valve
D. In a globe type valves, mechanical seals are used for providing sealing between the valve bonnet and the spindle
Q- Kinetic energy is converted into pressure energy in a turbocharger compressor by :
A. Combined diffuser and nozzle ring
B. Nozzle ring only
C. Combined diffuser and volute casing
D. Volute casing only
Answer-C
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?
A. TRUE
B. FALSE
C. First Sentence is right. Second one is wrong
D. I Don't know
Answer-B
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
Answer-C
MMD Important Question
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
Answer-C
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
Answer-B
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-C
Q- We have a problem with vibration in the turbocharger. What might be the cause?
A Dirty air inlet filter.
B The turbine rotor is not balanced
C The lubricating oil needs to be changed.
D Worn out turbocharger bearings.
Answer-B and D (B Becoz if any othe turbine blade hs been worn out or something turbine wil nt be balanced D Becoz naturally if the roller or balll baering hs been wotn it in either turbine or comprsr side respectively vibrations wud be producd)
Q- Two compressors should not be run in parallel because
A.It is not efficient to run two compressors
B.It will give over capacity in the system
C.There is possibility of losing oil from the compressors
D.A and B
Answer-C
Important Question for MMD
Q- You have valves of same bore diameter but of different types. Which of the following is arranged in the decreasing order closing torque required for giving a perfect seal?
A. Globe valve, Ball valve, Butterfly valve(rubber seat)
B. Ball valve, Globe valve, Butterfly valve(rubber seat)
C. Butterfly valve(rubber seat), Globe valve, Ball valve
D. Globe valve, Butterfly valve(rubber seat), Ball Valve
Answer-C
Q- G.E overspeed trip what will u check
a governer is not responding(ANS)
b.fuel system
c.moving parts (crank shaft)
d.all of the above
Answer-A
Q- With full load on the main engine, the turbocharger tachometer reads: Too low RPM. Why?
A Damaged connection between pick- up and tachometer unit
B Pick up is not connected to turbocharger.
C Turbocharger need to be cleaned/ overhauled.
D Pick up for tachometer is wrongly adjusted.
Answer-D
Q- To reduce the weight of the reciprocating parts pistons of high speed engines are made considerably shorter.This results in__________
A. less piston slap and quiter running
B.increased crankshaft bearing wear
C.slightly greater piston wear
D.decreased side pressure
Answer-D
Q- It is given that engine room bilge pump has suction manifold on which 3 valves are located. One valve for the 3 engine room bilge wells suction, another one for Bilge tank suction and the third one is for sea water suction. It is found that the Bilge pump is unable to take suction from any of the bilge wells, but is able to take suction efficiently from Bilge tank. What is the most probable cause?
A. Pump suction filter cover gasket leaking
B. Suction filter cover gasket of one of the Bilge wells is leaking
C. Bilge well suction pipeline leaking between individual bilge well valves and suction manifold valve
D. Bilge pump suction pipeline leaking between the manifold and the pump
Answer-C
Q- Which factor must be considered when determining the order of loading of dissimilar products through the same piping system aboard a tanker?
Contamination of the cargo
Flash points
Reid vapor pressures
Specific gravities
Answer-Not Sure
Q- Leaking valves in a low pressure, reciprocating, air compressor can result from __________ .
excessive compressor discharge pressure
operating the compressor at excessive speed
uneven piston stroke in the compressor
abrasion by dust and dirt
Tricky Question Answer will be anyone of them But You Have to Choose the Most Appropriate
Q- when the control lever actuates in sterring gear.
a.run two motors and the control can be actuated
b.by manual opearation
c.run one motor and control can be achieved
Answer-B
Q- Overall length of pairs of rams is reduced in which of the following tiller designs of a steering gear arrangement?
A. Forked tiller design
B. Round arm tiller design
C. Conventional tiller design
D. None of the above
Answer-A
Q- Inert Gas System on board tankers is used during which of the following operations-
A.Inerting of empty tanks
B.Inerting during crude oil washing
C.Purging before gas freeing
D.All of the above
Answer-D
Q- In case of failure of control air supply ,some valves continue locked in the position they were at the time of failure. They are said to be-
A.Fail-safe
B.Fail –proof
C.Fail-set
D.Fail -blocked
Answer-C
(If you find some Questions are Repeating it mean that question repeats in the next year)
Q- Too high Calculated Carbon Aromaticity index (CCAI) of fuel oil indicates:
A. Reduced ignition delay
B. Increased ignition delay
C. Reduced chances of knocking
D. None
Answer-B
Q- The seating material for perfectly sealing type Ball valves is usually made up of
A. Rubber
B. PTFE or Nylon • •
C. Rubber reinforced with steel wire
D. Stainless steel
Answer-B
Q- F.O. transfer pump was working efficiently, but it stopped taking suction suddenly. There is a sounding of 6.0 m in the F.O. deep tank. The suction pressure gauge was renewed recently and is showing a positive pressure when pump is running, but Pump is not transferring any F.O. What is the most probable cause?
A. Pump is damaged and needs overhaul
B. Suction filter cover gasket might leaking
C. Pump relief valve might be leaking
D. The pump suction pipeline is blocked Answer-C (Because relief valve releases the excess pressure not full recirculation ....but sme amt will be transferred ....this was happend in my ship in LO PUMP)
Q- A high pressure differential in a main engine fuel oilfilter onboard can be best reduced by A. Back flushing the filter manually B. Stopping the main engine to change the filter element C. Changing over to stand by filter if provided D. None of the above
Answer-A (Because by changing on to the other filter u r not reducing the differencial pr in that filter element)
Q- When removing the cap from a sounding tube on a MODU, the sound of air escaping indicates _______________.
(a) the tank is full
(b) the tank may be partially flooded
(c) the tank level has dropped
(d) the tank is completely flooded
Answer-B
Q- Vaccum evaporators onboard are tested for max vaccum by
A. pr. testing of evaporator shell
B. carry out leak test for distillate pp at sea
C. carry out leak test for vaccum pp and fittings
D. leak test evaporator shell
Answer-A and D
Q- The theoretical minimum compression ratio necessary to ensure compression ignition in a direct injection diesel engine is __________ .
A 10:01
B 12:01
C 08:01
D all of the above
Answer-B
Q- When both the steering motors are in use??
1) 12 nautical miles near port
2) pilot on-board
3) navigational prblm
4) all the above
Answer-4
Q- Subsequent to a oil spill in Engine Room and ingress of oil in the bilge wells ,the best course of action is to _______________________________
A.Use oil spill dispersant chemical in the bilge wells
B.Transfer the oily mixture and let it settle in the bilge holding tank/bilge separator tank
C.Transfer the oily mixture using a portable pneumatic pump to a waste oil tank and then physically demuck and clean the bilge wells using environment friendly cleaner
D.Dilute the bilge wells by flooding with water and then use the general service pump to pump out the bilges
Answer-C
Q- The muffling of exhaust gas noise in 4 stroke auxiliary engines in achieved by
(a) Allowing the gas to expand.
(b) Change the direction of their flow.
(c) Cool the gas with injected water.
(d) Cool the gas with scavenge air.
Answer-A and B
Q- Electric and electro-hydraulic steering gear motors are required by Coast Guard Regulations (46 CFR) to be _________.
A. protected by a circuit breaker set at 125% and a thermal overload device
B. provided with a running motor overcurrent protection device
C. served by a single two conductor cable
D. served by two feeder circuits
Answer-D (Because Steering gear motor do not have any trip for safety reason )
No comments:
Post a Comment