Quiz 1

Question 1

Fuel storage and supply tanks should not withdraw directly off the bottom because:

the fuel line could be easily damaged.

the fittings would not be accessible for servicing.

water and sediment may be withdrawn with the fuel.

there will be no fuel reserve left in the tank.

Answer 1

water and sediment may be withdrawn with the fuel.

Question 2

The term cloud point refers to the:

temperature that the fuel ignites and burns producing smoke.

lowest temperature at which the fuel will pour.

temperature at which the fuel gives off a cloud of vapours.

temperature at which waxes (paraffins) become solids in the fuel.

Answer 2

temperature at which waxes (paraffins) become solids in the fuel.

Question 3

When handling diesel fuel, prolonged contact with skin can cause a condition called:

psoriasis.

dermatitis.

oil pneumonia.

microbial contamination.

Answer 3

dermatitis.

Question 4

As compared to winter diesel fuel, the BTU content of summer diesel fuel is:

insignificant.

the same.

lower.

higher.

Answer 4

higher.

Question 5

The centreline of a fuel storage tank should be mounted on a slight angle so that:

the tank will be more stable.

condensation will not form as readily.

water and sediment will collect on one end for drainage.

fuel will collect on one end for withdrawal.

Answer 5

water and sediment will collect on one end for drainage.

Question 6

The following phrase that best describes the term flash point is:

self ignition temperature of a fuel.

the temperature that fuel ignites and continues to burn.

lowest temperature fuel will give off flammable vapours.

rate of evaporation of a fuel.

Answer 6

lowest temperature fuel will give off flammable vapours.

Question 7

The term cetane rating refers to the ability of:

diesel fuel to resist ignition.

diesel fuel to ignite.

gasoline to resist ignition.

diesel fuel to vaporize.

Answer 7

diesel fuel to ignite.

Question 8

Galvanized steel storage tanks should not be used for diesel fuel because:

the galvanized coating forms rust deposits.

they are too costly.

the fuel reacts chemically with the zinc in the galvanized coating.

they are too heavy.

Answer 8

the fuel reacts chemically with the zinc in the galvanized coating.

Question 9

In diesel fuel injection test equipment, what should be used in the winter?

test oil

summer diesel

kerosene

winter diesel

Answer 9

test oil

Question 10

In diesel fuel injection test equipment, test oil should be used because it has:

colour added for leak detection.

controlled viscosity for accurate testing.

a stronger odour making fumes easier to detect.

a lower flash point.

Answer 10

controlled viscosity for accurate testing.

Question 11

The need for a filter element change is usually indicated by

lack of power at full load-full speed.

engine over-fueling at light load.

engine failing to start when warm.

engine misfiring at low engine speed.

Answer 11

lack of power at full load-full speed

Question 12

A restricted return line in the system shown above would

have a higher than normal pressure.

lower fuel flow.

higher than normal temperature.

all of the above are correct.

Answer 12

all of the above are correct.

Question 13

Gear type transfer pumps, pump fuel

out between the gear teeth and housing.

in between the housing and endplates.

out between the gear teeth.

in between the gear teeth.

Answer 13

out between the gear teeth and housing.

Question 14

The operator of a motor scraper is complaining that the engine loses power and stumbles (inconsistent misfire) under load. No problems were revealed until fuel supply pressure was measured at the injection pump and found to be significantly below specification. Mechanic A suggests using a vacuum gauge to check the running restriction across the secondary filter. Mechanic B suggests measuring the pressure drop across the primary filter. Whose advice would you follow or would you take another course of action?

Mechanic A has provided good advice.

Mechanic B has provided good advice.

Either suggestion could lead to a successful diagnosis.

Neither mechanic A nor mechanic B have provided valuable guidance.

Answer 14

Neither mechanic A nor mechanic B have provided valuable guidance.

Question 15

When maximum pressure is present on the outlet side of a diaphragm pump

the pump is “out of stroke” and does not pump.

the outlet valve remains open.
Incorrect Response
the diaphragm spring is fully extended.

the intake valve remains open.

Answer 15

the pump is “out of stroke” and does not pump.

Question 16

An air leak in fuel suction lines can cause?

Hard starting.

Low power.

Both Hard starting and Low power.

Neither Hard starting nor Low power.

Answer 16

Both Hard starting and Low power.

Question 17

Which of the following statements is correct in relation to filter service?

Fuel filters have a bypass valve in case they become restricted.

Fuel filters have no bypass valve when they become restricted consequently fuel flow decreases.

Both statements are correct

Neither statement is correct

Answer 17

Fuel filters have no bypass valve when they become restricted consequently fuel flow decreases.

Question 18

A high reading on the vacuum gauge closest to fuel tank would indicate

a restricted primary filter.

an air leak.

a restricted secondary filter.

a transfer pump problem.

Answer 18

a restricted primary filter.

Question 19

The type of pump that is least susceptible to contamination damage would be the

vane type.

diaphragm.

piston type.

gear type.

Answer 19

diaphragm.

Question 20

To check the pressure being maintained by the overflow valve, a pressure gauge should be located

at any point in the fuel return line.

in the fuel supply line after the final filter.

in the fuel return line past the overflow valve.

at any point in the fuel supply system.

Answer 20

in the fuel supply line after the final filter

Question 21

The period of time from when fuel is injected to when ignition of the fuel actually occurs is referred to as:

combustion lag.

pre-ignition.

ignition delay.

post combustion.

Answer 21

ignition delay.

Question 22

What are four methods used to assist starting a diesel engine at low ambient temperatures.

Heat the engine coolant.

Crank the engine faster

Heat the battery

Adding more air to engine with turbocharger

Heat the intake air.

Heat the engine oil.

Heat the fuel.

Answer 22

Heat the engine coolant.
Heat the intake air.
Heat the engine oil.
Heat the fuel.

Question 23

Depending on the grade, the auto ignition temperature of diesel fuel ranges from:

500 - 700°F (260 - 370°C).

400 - 600°F (204- 315°C).

700 - 800°F (370 - 427°C).

900 - 1200°F (482 - 649°C).

Answer 23

500 - 700°F (260 - 370°C).

Question 24

Fuel heaters should be thermostatically controlled because:

the fuel lines will become brittle.

high fuel temperatures will cause a loss of horsepower.

ignition of the fuel will be early.

the engine will “knock”.

Answer 24

high fuel temperatures will cause a loss of horsepower.

Question 25

As altitude and air temperature increase, air will have:

decreased density.

high resistance.

increased density.

high humidity.

Answer 25

decreased density.

Question 26

Low sulphur diesel fuels are being used to reduce emissions of:

HC.

CO.

SO×.

NO×.

Answer 26

SO×.

Question 27

List three (3) factors that are necessary for combustion in a diesel engine.

Air.

Heat.

Spark.

Fuel.

Answer 27

Fuel.
Air.
Heat.

Question 28

Low compression pressure (below manufacturers specifications) could cause:

A: hard starting.

B: black exhaust smoke.

C: white exhaust smoke.

both A. and C. responses are possible.

Answer 28

both A. and C. responses are possible.

Question 29

As compared to an open combustion chamber, a precombustion chamber will:

have lower combustion pressures.

burn a wide range of fuels.

have lower injection pressures.

all of the above responses are correct.

Answer 29

As compared to an open combustion chamber, a precombustion chamber will:

have lower combustion pressures.

burn a wide range of fuels.

have lower injection pressures.

all of the above responses are correct.

Question 30

The formation of smog is the result of:

particulates and high humidity.

CO, HC and cool temperatures.

particulates and high temperatures.

HC, NOx and sunlight.

Answer 30

HC, NOx and sunlight.

Question 31

In a basic fuel injection system, multi-plunger pumps use

hydraulically actuated fuel injectors

unit injectors

neither

both

Answer 31

hydraulically actuated fuel injectors

Question 32

Optimum crank angle is usually

20 to 25 degrees BTDC

20 to 25 degrees ATDC

10 to 15 degrees ATDC

10 to 15 degrees BTDC

Answer 32

20 to 25 degrees ATDC

Question 33

“Hydraulic injectors” and “unit injectors” are two terms for the same injectors.

True
False

Answer 33

False

Question 34

Fuel atomization is controlled by how many factors?

one

two

three

four

Answer 34

two

Question 35

Regardless of design, all diesel fuel injections systems must perform

A: timing

B: rate

C: atomization

D: metering

E: penetration

A,C, D

All of the above

Answer 35

All of the above

Question 36

Fuel tanks should be vented to prevent:

the tank from being overfilled.

a vacuum from forming in the tank during withdrawal.

condensation from forming in the tank.

contamination of the fuel supply.

Answer 36

a vacuum from forming in the tank during withdrawal.

Question 37

Fuel penetration is controlled by pressure and number and placement of holes in the nozzle

True
False

Answer 37

True

Question 38

Which statement about fuel injection lines is correct?

A: High pressure lines are all equal length

B: High pressure lines are made of heavy wall seamless tubing

Both statements are correct

Neither statement is correct

Answer 38

Both statements are correct

Question 39

Sleeve metering is used by Robert Bosch as well as which other manufacturer

Caterpillar

Stanadyne

Lucas

Detroit Diesel

Answer 39

Caterpillar

Question 40

On a fuel supply tank, the fuel outlet and return fittings should be separated by bulkheads or a minimum distance so that the return fuel:

is warmed up during winter operation.

has time to settle and cool.

is collected in the sump.

is forced to pass through filtration.

Answer 40

has time to settle and cool.