- Q- A fluctuating and unsteady vacuum in an evaporator may be caused by _____________.
1. wet steam entering the air ejector nozzle
2. pinhole leaks in the evaporator tube nests
3. rapid scaling on the evaporator tube nests
4. high water levels in the last effect
Answer-1
- Q- Which of the main shaft segments listed below, that are connected with the main engine, are coupled to the tail shaft flange?
a. Thrust shaft
b. Stern-tube shaft
c. Intermediate shaft
d. Crank shaft
Answer-C
- Q- Piping cross-sections over 30 cm in diameter are sized by the __________.
a. inside diameter
b. wall thickness
c. outside diameter
d. threaded diameter
Answer-C
- Q*- You have overhauled a centrifugal pump and while assembling forgot to install the o-ring between the sleeve (provided in way of gland packing) and the shaft. What impact does this have? (single answer)
e) It will not affect the pump in any way
f) It will cause leakage of fluid(air/water) in between the shaft and the sleeve and will affect the pump performance
g) It will not affect the pump performance n any way but will corrode the shaft between the o-ring and shaft
h) It will cause dynamic imbalance of the shaft
Answer-F
- Q- Correct method of greasing a centrifugal pump bearing is:
A. To pump the grease until you feel high back pressure on the Grease pump
B. To pump the greasefor 3-4 pumping strokes of Grease pump for each bearing
C. To pump the grease when the pump is stopped and drain any old grease at the same time by opening the drain plug, giving only 3-4 pumping strokes on Grease pump for each bearing. the drain plug should then be replaced
D. To pump the grease when the pump is running and drain any old grease at the same time by opening the drain plug, until all the old grease is removed and new grease starts coming out of the drain, repeating same for each bearing. the drain plug should then be replaced
Answer-D
- Q- Why is it essential to renew turbocharger bearings after a preset number of hours of running even if the bearings are in seemingly perfect condition?
A. Because they are prone to failure due to prolonged exposure to high temperature conditions.
B. Because they are subject to cyclic loading and are prone to failure due to metal fatigue.
C. It is not essential to renew if condition monitoring suggests perfect condition.
D. Lube oil contamination is bound to occur and affect the condition of the bearings.
Answer-B
- Q- What long term effect will excessively high temperature have on lubricating oil quality?
A Cause oxidation which reduce viscosity.
B Evaporates the oil giving high consumption.
C The oil flashpoint will be changed.
D Cause oxidation which increase viscosity.
Answer-D
- Q- You have checked the oil viscosity in an auxiliary engine with the viscosity test kit. The result shows that the viscosity is high. What will you do?
A Decrease the cooling water temperature for the oil.
B Clean the system and change the oil
C Increase the cooling water temperature for the oil.
D Increase the lub oil pressure.
Answer-B
- Q- If 3 Centrifugal pumps are running in parallel and the backpressure is substantially increased, what effect will be observed on the pumps in use.
A.Flow rate will reduce.
B.Increase in the pump casing temperature.
C.Safety alarms and trips (high casing Temperature) will activate, if no corrective action taken
D.All of the above.
Answer-D
- Q- Valves used in diesel engine fuel oil pressure piping are to be
a)installed to close against flow
b)solenoid released upon the failure of engine lubrication
c)either of the gate or globe valve type
d)forge constructed under the approval of the Marine Inspector
Answer-A
- Q- When specified Discharge pressure is not achieved, The Possible cause could be?
A. Discharge pressure too high
B. Pump speed too low
C. Casing ring is worn out
D. Cavitations exists
E. All of the above
Answer-B,C and D
- Q- Pump Start But Motor gets overloaded or Trip on overload.
A. Alignment is wrong
B. Gland packing too tight
C. Worn out / Damaged ball bearing
D. Cavitations exists
E. All of the above
Answer-A,B and C
- Q- A normal manometer reading of turbocharger air suction filter and normal speed of the turbocharger but reduced scavenge air pressure may be due to:
A. Fouling of the nozzle ring
B. Fouling of diffuser or compressor wheel
C. Fouling of the turbine
D. Cold climate
Answer-B
- Q- length of the rams is decreased in which type of sterring gear?
a. fork type
b. circular type
c. conventional type
d. none of the above
Answer-A
- Q- Following method is sometimes used in constant pressure turbochargers of a 4-stroke diesel alternators during starting and rapid acceleration :
A. Auxiliary electrical blowers assisting turbochargers during starting
B. Auxiliary shaft driven blowers assisting turbochargers during starting
C. Auxiliary air drive for turbocharger acceleration during starting
D. Variable geometry turbocharging
Answer-C
- Q- The difference between rotocap and spinners for rotating exhaust valve spindle is that:
A. Rotocaps rotate the valves while closing, while spinners rotate them while opening
B. Rotocaps rotate the valves while opening, while spinners rotate them while closing
C. Rotocaps rotate the valves while opening, while spinners rotate the valve for the entire duration until valve is seated
Answer-C
- Q- the difference between water washing and dry cleaning the TC turbine is
a)there is no difference one is wet, the other is dry
b)wet washing requires reduced load
c)dry cleaning requires reduced load
d)none of the above
Answer-B
- Q- Some 4-stroke engines are fitted with a rotorcap on the cylinder head valves. For what reason?
A. Rotate the inlet valve during operation.
B. Distribute the exhaust gas or the air inlet better to improve combustion.
C. Improve the scaling surface function, increase the service time of the exhaust valve in the engine
D. To prevent the valve spindle from sticking
Answer-C
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