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Fuels > quiz 2 > Flashcards

quiz 2 Flashcards

1
Q

If the oil pressure is lost, on an engine equipped with a Murphy switch gauge, the engine stops because:

circuit to the shutoff is completed by the sending unit.

the warning light completes a circuit to the fuel shutoff.

oil pressure holds a switch closed that completes a circuit to the shutdown.

circuit to ground is completed by the pressure gauge needle.

A

circuit to ground is completed by the pressure gauge needle.

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2
Q

A good warning system alerts the operator to

a past problem

an imaginary problem

a potential problem

an existing problem

A

a potential problem

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3
Q

An engine warning and shutdown system can:

activate a shutdown device.

sound an audible alarm.

display a visual warning signal.

de-rate the engine power output by limiting fuel input.

any of the above responses are correct.

A

any of the above responses are correct.

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4
Q

If two or more warning systems are installed on an engine, it’s important that

they are wired in series

they are not wired through the battery disconnect switch

they are wired independent

they are wired in parallel

A

they are wired independent

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5
Q

The engine dipstick is considered an engine warning system.

True
False
A

True

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6
Q

Lubricating oil dilution, on an engine equipped with an inlet metered pump, can result because of:

a leaking transfer pump seal.

a “dribbling” injection nozzle.

a leaking housing gasket.

a leaking drive shaft seal.

A

a leaking drive shaft seal.

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7
Q

The amount of fuel that enters the pumping elements is affected by:

metering valve position.

transfer pump pressure.

time inlet port is aligned.

all of the above.

A

all of the above.

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8
Q

What is the purpose of the fuel pressure regulator valve?

control oil pressure

act like a relief valve for the feed pump.

control transfer pump pressure

control fuel injection

A

control transfer pump pressure

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9
Q

The fuel pump is statically timed to the engine while the engine is running.

True
False
A

False

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10
Q

What component(s) is/are moved to automatically advance the start of injection, on many opposed plunger, inlet metering fuel injection pumps?

the opposed plungers

the transfer pump

the cam ring

he weight and cam ring timing marks

A

the cam ring

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11
Q

The automatic timing advance unit would perform the following when advancing the fuel injection timing:

rotate the rotor in the direction of rotation.

rotate the cam ring against the direction of rotation.

rotate the cam ring in the direction of rotation.

rotate the rotor against the direction of rotation.

A

rotate the cam ring against the direction of rotation.

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12
Q

The operation of the mechanical type of governor relies on the use of a set of flyweights.

True
False
A

True

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13
Q

The metering valve, in part, controls the amount of fuel that enters the pumping element.

True
False
A

True

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14
Q

An electronic limiting speed governor is one which:

controls maximum RPM and idle RPM.

controls the maximum governed RPM only.

does not control engine RPM.

controls the idle RPM only.

A

controls maximum RPM and idle RPM.

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15
Q

Question 15 1 / 1 point
The first step in correcting the amount of advance provided by the speed advance mechanism should be:

checking the advance piston for freedom of movement.

adjust transfer pump pressure to specifications.

adjusting the retard piston trimmer screw.

checking the retard piston return spring for tension.

A

adjust transfer pump pressure to specifications.

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16
Q

High-pressure fuel is forced to the fuel injector when the opposing plungers within the cam ring are far apart.

True
False
A

False

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17
Q

The nozzle illustrated can be classified as:

inward opening.

hydraulically operated differential needle valve.

multi-hole.

all of the above are correct.

A

all of the above are correct.

18
Q

All turbocharged engines equipped with mechanical governors have an aneroid pressure ratio control to eliminate the exhaust smoke that occurs naturally with sudden throttle changes.

True
False
A

True

19
Q

A worn transfer pump may cause:

hard engine starting.

erratic engine operation.

imperfect engine idle.

all of the above.

A

all of the above.

20
Q

During injection the cam ring forces the:

pumping plungers together in the cylinder.

the delivery valve in toward the discharge passage.

rotor out toward the discharging ports.

pumping plungers out toward the hydraulic head.

A

pumping plungers together in the cylinder.

21
Q

On a 3054 engine the injection pump will rotate:

at engine camshaft speed.

at double the engine crankshaft speed.

at engine crankshaft speed.

at one-half engine camshaft speed.

A

at engine camshaft speed.

22
Q

Exhaust smoke cannot result from dribble at the fuel injector nozzle.

True
False
A

False

23
Q

The transfer pump supplies low-pressure fuel to the pumping element via the metering valve.

True
False
A

True

24
Q

A limited speed governor on a mechanical fuel pump controls:

high idle only.

idle and high idle only.

all intermediate speeds.

idle only.

A

idle and high idle only.

25
Q

Attempting to change injection pump timing while the engine is running, may result in:

seizure of the rotor to the hydraulic head.

damage to the fuel injection lines.

serious personal physical injury.

any or all of the above may occur.

A

any or all of the above may occur.

26
Q

The most important advantage of an air shutdown, as compared to a fuel shut-off, for diesel engines is:

easier restarting of the engine is ensured.

damage to the injection nozzles and fuel pump is prevented.

any outside sources of fuel are eliminated.

bleeding of the air from the fuel system after shutdown is eliminated.

A

any outside sources of fuel are eliminated.

27
Q

The 3406C nozzle tip illustrated will:

deliver several finely atomized sprays.

be used in an indirect injection engine.

deliver a single conical shaped spray.

be spring opened.

A

deliver several finely atomized sprays.

28
Q

An aneroid control momentarily reduces fuel flow to the metering system when the throttle is suddenly depressed. Fuel flow is gradually adjusted to match the increasing air flow as the turbocharger gains rpm.

True
False
A

True

29
Q

For a 6 cylinder, 4 stroke cycle engine, the cam ring will usually have:

3 lobes.

4 lobes.

8 lobes.

6 lobes.

A

6 lobes.

30
Q

The pump will stop delivering fuel if the:

fuel return line is completely blocked.

regulating piston allows some fuel to bypass.

delivery valve spring is weak or broken.

metering valve allows some fuel to leak into the housing.

A

fuel return line is completely blocked.

31
Q

One injection nozzle malfunction that cannot be identified on the pop tester is:

dribbling after injection.

excessive return leakage.

sticking at high speed.

erratic opening pressure.

A

sticking at high speed.

32
Q

A measurement used for engine torque is:

newton meter.

kilowatts.

joules.

kilopascals.

A

newton meter.

33
Q

When are engines de-rated?

When air density is reduced because of high altitudes.

500 feet above sea level.

10,000 feet below sea level.

When you need more power.

A

When air density is reduced because of high altitudes.

34
Q

An engine on a dynamometer produces 1800 ft.lbs. of torque at 1500 RPM. What is the horsepower of the engine?

633

514

1200

2,700,000

A

514

35
Q

The horsepower rating used to measure flywheel horsepower is called:

brake horsepower.

intermittent horsepower.

continuous horsepower.

frictional horsepower.

A

brake horsepower.

36
Q

A measurement used for engine power output is:

kilowatts.

joules.

Kilopascals.

newton meter.

A

kilowatts.

37
Q

A defective nozzle can often be identified on a running engine by:

feeling the transfer pump pressure line.

loosening the injector line nut at each nozzle in turn.

blocking the injector line at each nozzle in turn.

a. and b

A

loosening the injector line nut at each nozzle in turn.

38
Q

What are the benefits of a properly tuned engine?

Lowest possible exhaust emissions.

Greatest possible fuel economy.

Maximum power output.

All the above.

A

All the above.

39
Q

Back leakage is required in some nozzle valve applications to assist in the important function of:

warming the fuel in the supply tank.

lubricating the needle valve.

preventing secondary injections.

lubricating the fuel supply pump.

A

lubricating the needle valve.

40
Q

Preventative maintenance schedules are developed by the manufacturer to:

extend engine life.

keep the engine running efficiently.

increase the cost of operating the engine.

both a and b are correct.

A

both a and b are correct.

Fuels (4 decks)

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