Ek Motor
- 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.
Have excessive sensitivity to small speed changes
- C.
Fail to react to small speed changes
- D.
Remain in the neutral position
Correct Answer
C. Fail to react to small speed changes -
- 2.
A cracked cylinder head in an operating engine may be indicated by __________.
- A.
A steady flow of water from the expansion tank vent
- B.
Lower temperature at the cylinder head water discharge
- C.
Combustion gases venting at the expansion tank
- D.
Water draining from the fuel leakoff lines
Correct Answer
C. Combustion gases venting at the expansion tank -
- 3.
The diameter of a piston is usually less at the crown than at the skirt, in order to __________.
- A.
Facilitate the installation of piston rings
- B.
Prevent crankcase vapors from entering the combustion chamber
- C.
Reduce wearing of the upper cylinder liner
- D.
Allow for the expansion of the piston during operation
Correct Answer
D. Allow for the expansion of the piston during operation -
- 4.
What may be used to protect starting air mains against explosions arising from improperly functioning starting valves?
- A.
No protection is necessary because all starting air valves are designed similar to check valves.
- B.
The starting air main shall be protected by the use of a rupture disc.
- C.
An isolation non-return valve is to be installed at the starting air supply connection to each engine.
- D.
The materials used in the construction of the starting air mains will contain any explosion
Correct Answer
C. An isolation non-return valve is to be installed at the starting air supply connection to each engine. -
- 5.
The highest pressure in a diesel engine cylinder normally occurs __________.
- A.
Before TDC
- B.
During air starting
- C.
At TDC
- D.
After TDC
Correct Answer
D. After TDC -
- 6.
The most important factor in engine performance is the actual power output at the end of the crankshaft available for doing work. This is known as __________.
- A.
Brake horsepower
- B.
Net horsepower
- C.
Friction horsepower
- D.
Indicated horsepower
Correct Answer
A. Brake horsepower -
- 7.
A naturally aspirated diesel engine at full throttle will have an intake manifold pressure
- A.
Slightly less than atmospheric pressure
- B.
Approximately equal to exhaust manifold pressure at all times
- C.
That is widely fluctuating
- D.
Constantly decreasing as engine load increases
Correct Answer
A. Slightly less than atmospheric pressure -
- 8.
The nuts of main bearings, connecting rodbolts and all other moving parts are to be secured by
- A.
Hydraulic nuts as commonly found on large low speed engines
- B.
Cotter pins made of spring steel
- C.
Split pins or other effective means
- D.
Hardened steel nut locks
Correct Answer
C. Split pins or other effective means -
- 9.
Which of the following condition may need to be reduced when operating a large, low-speed, main propulsion, diesel engine at low loads?-
- A.
Injection pressures
- B.
Control air supply pressure
- C.
Lube oil temperature
- D.
Cooling water flow through after coolers
Correct Answer
D. Cooling water flow through after coolers -
- 10.
Increasing the valve clearance between a valve stem and rocker arm, will result in the valve
- A.
Closing later
- B.
Staying open for a shorter period of time
- C.
Opening sooner
- D.
Staying open for a longer period of time
Correct Answer
B. Staying open for a shorter period of time -
- 11.
The rate of fuel injection in a diesel engine cylinder depends primarily on
- A.
Timing of the pump
- B.
The size of the holes in the fuel nozzle
- C.
Supply pressure to the pump
- D.
Shape of the combustion chamber
Correct Answer
B. The size of the holes in the fuel nozzle -
- 12.
If the compression ratio is increased on any diesel engine, __________.
- A.
Thermal efficiency will increase
- B.
Combustion will be slowed down
- C.
The expansion ratio will decrease
- D.
Thermal efficiency will decrease
Correct Answer
A. Thermal efficiency will increase -
- 13.
A diesel engine may fail to start when being cranked, due to __________.
- A.
Insufficient compression
- B.
High lube oil pressure
- C.
Low lube oil viscosity
- D.
High cetane number
Correct Answer
A. Insufficient compression -
- 14.
A diesel engine emits blue exhaust smoke as a result of __________.
- A.
Excessive cylinder lubrication
- B.
A light load
- C.
Excessive compression pressure
- D.
Cold intake air
Correct Answer
A. Excessive cylinder lubrication -
- 15.
In a normally operating diesel engine, the main source of lubricating oil contamination in the crankcase is a result of the -
- A.
Condensation of water vapors
- B.
Breakdown of the lubricating oil itself
- C.
Air when no air cleaners are used
- D.
Metal particles loosened by wear
Correct Answer
B. Breakdown of the lubricating oil itself -
- 16.
When the lower edge of the spiral begins to uncover the release port in a jerk pump, the
- A.
Plunger rotates to the zero delivery position until next stroke
- B.
Pres. drops slowly until the full stroke is attained
- C.
Pumping continues until the plunger travels its full stroke
- D.
Effective pumping stroke of the plunger ends
Correct Answer
D. Effective pumping stroke of the plunger ends -
- 17.
Diesel engine control can be obtained by the bridge __________.
- A.
Whenever the secondary station is switched to 'bridge control'
- B.
Only after the engine room control station is switched to 'bridge control'
- C.
With the approval of the chief engineer only
- D.
At any time
Correct Answer
B. Only after the engine room control station is switched to 'bridge control' -
- 18.
Trunk type diesel engine pistons are effectively cooled when heat is __________.
- A.
Transferred to water cooled cylinder walls
- B.
Radiated through the engine block
- C.
Conducted through the piston crown
- D.
Transferred to escaping exhaust gases
Correct Answer
A. Transferred to water cooled cylinder walls -
- 19.
The amount of fuel injected in a particular time, or degree, of crankshaft rotation is termed
- A.
Timing
- B.
Metering
- C.
Rate of distribution
- D.
Rate of injection
Correct Answer
D. Rate of injection -
- 20.
Which of the listed types of gasket material should be used on high pressure fuel oil lines on a diesel engine?
- A.
Neoprene
- B.
Soft copper
- C.
Sheet asbestos
- D.
Fiberglass
Correct Answer
B. Soft copper -
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Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.
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Current Version
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Mar 17, 2022Quiz Edited by
ProProfs Editorial Team -
Sep 19, 2014Quiz Created by
Prashubh
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