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1. A diesel engine may fail to start when being cranked, due to __________.

Insufficient compression

High lube oil pressure

Low lube oil viscosity

High cetane number

2. A diesel engine emits blue exhaust smoke as a result of __________.

Excessive cylinder lubrication

A light load

Excessive compression pressure

Cold intake air

3. If the compression ratio is increased on any diesel engine, __________.

Thermal efficiency will increase

Combustion will be slowed down

The expansion ratio will decrease

Thermal efficiency will decrease

4. Trunk type diesel engine pistons are effectively cooled when heat is __________.

Transferred to water cooled cylinder walls

Radiated through the engine block

Conducted through the piston crown

Transferred to escaping exhaust gases

5. A naturally aspirated diesel engine at full throttle will have an intake manifold pressure

Slightly less than atmospheric pressure

Approximately equal to exhaust manifold pressure at all times

That is widely fluctuating

Constantly decreasing as engine load increases

6. Diesel engine control can be obtained by the bridge __________.

Whenever the secondary station is switched to 'bridge control'

Only after the engine room control station is switched to 'bridge control'

With the approval of the chief engineer only

At any time

7. 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 __________.

Brake horsepower

Net horsepower

Friction horsepower

Indicated horsepower

8. Friction developing between the moving parts of a governor, governor linkage and control valve will cause the governor to

React with insufficient speed droop

Have excessive sensitivity to small speed changes

Fail to react to small speed changes

Remain in the neutral position

9. The diameter of a piston is usually less at the crown than at the skirt, in order to __________.

Facilitate the installation of piston rings

Prevent crankcase vapors from entering the combustion chamber

Reduce wearing of the upper cylinder liner

Allow for the expansion of the piston during operation

10. Increasing the valve clearance between a valve stem and rocker arm, will result in the valve

Closing later

Staying open for a shorter period of time

Opening sooner

Staying open for a longer period of time

11. A cracked cylinder head in an operating engine may be indicated by __________.

A steady flow of water from the expansion tank vent

Lower temperature at the cylinder head water discharge

Combustion gases venting at the expansion tank

Water draining from the fuel leakoff lines

12. What may be used to protect starting air mains against explosions arising from improperly functioning starting valves?

No protection is necessary because all starting air valves are designed similar to check valves.

The starting air main shall be protected by the use of a rupture disc.

An isolation non-return valve is to be installed at the starting air supply connection to each engine.

The materials used in the construction of the starting air mains will contain any explosion

13. The highest pressure in a diesel engine cylinder normally occurs __________.

Before TDC

During air starting

At TDC

After TDC

14. The amount of fuel injected in a particular time, or degree, of crankshaft rotation is termed

Timing

Metering

Rate of distribution

Rate of injection

15. Which of the following condition may need to be reduced when operating a large, low-speed, main propulsion, diesel engine at low loads?-

Injection pressures

Control air supply pressure

Lube oil temperature

Cooling water flow through after coolers

16. The rate of fuel injection in a diesel engine cylinder depends primarily on

Timing of the pump

The size of the holes in the fuel nozzle

Supply pressure to the pump

Shape of the combustion chamber

17. The nuts of main bearings, connecting rodbolts and all other moving parts are to be secured by

Hydraulic nuts as commonly found on large low speed engines

Cotter pins made of spring steel

Split pins or other effective means

Hardened steel nut locks

18. When the lower edge of the spiral begins to uncover the release port in a jerk pump, the

Plunger rotates to the zero delivery position until next stroke

Pres. drops slowly until the full stroke is attained

Pumping continues until the plunger travels its full stroke

Effective pumping stroke of the plunger ends

19. Which of the listed types of gasket material should be used on high pressure fuel oil lines on a diesel engine?

Neoprene

Soft copper

Sheet asbestos

Fiberglass

20. In a normally operating diesel engine, the main source of lubricating oil contamination in the crankcase is a result of the -

Condensation of water vapors

Breakdown of the lubricating oil itself

Air when no air cleaners are used

Metal particles loosened by wear

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