marine auxiliary objective questions

              MARINE AUXILIARY 

Q1- During shutting down the purifier you find that purifier always vibrates heavily for some time and then becomes normal until it finally comes to a stop. What should be done to avoid this situation?

A. The purifier bowl should be cleaned before next startup

B. The brake should be applied so that the critical speed doesnot last long

C. Complete overhaul of the purifier should be carried out and the bearings need to be renewed

D. The bowl should be sent for balancing

Answer-B

Q2-An auxiliary engine turbo-charged makes strange noises when the load changes. The engine parameters however are absolutely fine. An external examination of turbocharger parameters as stated in the manual also reveals nothing. Would you do

(a) Continue to run the engine and wait for some time

(b) Stop the engine for a while and make some checks

(c) Reduce the load of the engine

(d) Run it on steady load to make some checks.

Q3-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

Q4- Sludge pump suction pressure is going full vacuum when u start the pump taking water of double bottom tank suction you have checked the suction filter and found in clean condition. Taking suction fr fuel oil sludge tank does not happen. Causes of the problem.

A) Pump is not working efficiently n reqd. overhauling

B) sludge tank suction valve is leaking

C) W.O. tank D.B. tank suction pipeline has a blockage.

D) Can ??? say what is the problem but definiterly the pump needs to b opened up for overhaul

Answer-C

Q5-ballast pump is being used to de-ballast a fore peak tank which is full. It is seen that suction pressure is positive and discharge pressure is very low compared to rated discharge head. It indicates that:

A. Pump is not operating satisfactorily and pumping capacity is too low

B. Pump is not operating satisfactorily and pumping capacity is higher than rated, throttling of discharge valve is required

C. Pumping capacity is not affected by suction and discharge pressures

D. Pump is operating normally

Answer-B

Q6- In a reciprocating pump the direction of flow depends upon:

A. Direction of rotation of the pump

B. Position & fixing of suction and discharge valves

C. High pressure to low pressure

D. Whether pump is single acting or double acting

Answer-B

Q7-If the direction of rotation of a gear pump is reversed due to change in-phase sequence, what happens when the pump is started?

A. Direction of flow remains the same

B. The pump will get damaged due to overpressure on suction side

C. Pump relief valve will be lifted

D. The direction of flow will be reversed

Answer-D

Q8-Which of the foll will cause cavitation

a. Low discharge pressure

b. Throttling the suction valve

c. Low water level in the wet well

d. High discharge pressure

Answer-C

Q9- In reverse osmosis type freshwater generator plants, pretreatment of the feed water is done to:

A. Soften the feed water

B. Sterilize the feed water

C. To facilitate wash through of salt deposits on elements

D. Add necessary minerals to the water

Answer-C

Q10-Centrifugal pumps cannot handle air and require priming.But you are aware that centrifugal which on the same principal can handle air very well. Which two properties of air are responsible because of which the centrifugal pumps cannot handle air:-

A. Fluidity only

B. Density only

C. Both fluidity and density

D. Compressibility

Answer-C

Q11- By which of the following is the attached vacuum pump of a ballast pump is driven?

A. Electrical motor

B. Hydraulic motor

C. Pump driven clutch

D. Pneumatically driven

Answer-C

Q12- Why centrifugal p/p not provided with safety valve while positive displacement p/p Is provided?

a. c/f p/p shut down head is o (zero)

b. c/f p/p shut down head is infinity

c. c/f p/p is so designed that it can withstand high pressure

d. not sure)

Answer-A

Q13- When centrifugal pump is overhauled it was found that shaft had developed grooves on it n no spare is available onboard what action can be taken

a. Order a new spare

b. Assemble the pump without doing anything n wait for the spare to arrive.

c. Machine the shaft sleeve on lathe n put back the new packing.

d. Leave the pump as it is

Answer-C