1) Friction developing between the moving parts of a governor, governor linkage and control valve will cause the governor to
a)react with insufficient speed droop
b)fail to react to small speed changes
c)have excessive sensitivity to small speed changes
d)remain in the neutral position
Answer-B2) A large change in ambient temperature, or using an oil of a viscosity different than the one recommended by the manufacturer in a mechanical hydraulic governor, will result in the need to adjust the
a)pilot valve opening
b)compensating needle valve
c)compensating spring tension
d)accumulator spring tension
Answer-B
3) Friction, engine wear, and oil consumption in a diesel engine are directly related to the
a)acidity of the oil
b)pour point of the oil
c)flash point of the oil
d)viscosity of the oil
Answer-D
4) When the prime movers of two paralleled generators, equipped with mechanical-hydraulic governors, are operating within their designed range, the unit with the least amount of speed drop will
a)pick up more of any increase in load
b)pick up less of any increase in load
c)share an equal amount of any increase in load
d)drop an equal amount of any decrease in load
Answer-A
5) 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
6) Trunk-type diesel engine pistons are most effectively cooled by heat
a)conducted through the engine block
b)conducted to water cooled cylinder walls
c)conducted through the piston crown
d)losses to escaping exhaust gasses
Answer-B
7) Fuel oil is injected into the cylinder of a four-stroke/cycle diesel engine during the
a)intake stroke
b)exhaust stroke
c)power stroke
d)compression stroke
Answer-D
8) A large, low-speed, main propulsion diesel engine uses sea water to directly cool the
a)cylinder heads
b)exhaust valves
c)scavenging air
d)injectors
Answer-C
9) The total starting air capacity required for reversible main engines is to be sufficient for a least
a)six consecutive starts
b)eight consecutive starts
c)ten consecutive starts
d)twelve consecutive starts
Answer-D
10) The light and medium fuels utilized in internal combustion engines provide a source of
a)lubrication for pistons and rings
b)food for microbiological organisms
c)gases most detrimental to the ozone layer of the atmosphere
d)all of the above
Answer-B
11) Which bearing half will receive the greatest load in a two-stroke/cycle diesel engine?
a)Lower half of the connecting rod bearing at the crankshaft end of the rod
b)Upper half of the main bearing
c)Lower half of the piston pin bearing in the connecting rod
d)All bearing halves share an equal load
Answer-C
12) Maximum lube system operating pressure for a diesel engine is normally regulated by a/an
a)orifice in the pump suction
b)special filter design
c)pressure drop through the filter
d)relief valve
Answer-D
13) 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
14) How large a deviation in opening pressure can be accepted in a diesel engine injection valve?
A 15 kg/cm2
B 40 kg
C 50 kg
D 70 kg
Answer-A
Multiple Choice Question
15) A high pressure differential in a main engine fuel oil filter 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 and C
16) The ash content of a fuel oil is significant to the operating engineer because it
A. is an indication of the amount of noncombustible material present in the oil
B. indicates the quantity of energy released by burning a unit amount of the fuel
C. is useful for determining proper atomization temperatures
D. reflects the overall thermal efficiency of the fuel oil service system
Answer-A
17)In the Alcap principle of centrifugal separation______________________
A. Water is only discharged when desludgeing is activated by the control unit
B. The valve at the water outlet is opened periodically based on timer action
C. The valve at the water outlet is opened on the basis of signal of water content to the control unit from the water transducer at the clean oil outlet
D. The centrifuge works as a clarifier with no water outlet
Answer-C
18) When main engine is running in emergency condition which of the alarm cant be bypassed.
A. LO low pressure
B. JCW high temp
C. Piston cooling water high temp
D. All
Answer-D
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