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SKT Book 3 > B3U2 Fuel Systems > Flashcards

B3U2 Fuel Systems Flashcards

1
Q

What are the two designs of mechanical injectors?

A

(1) Flanged.

(2) Cylindrical.

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2
Q

Name what the amount of pressure required by a hydraulic injector depend?

A

The amount of pressure developed inside the cylinder during compression.

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3
Q

What determines the spray pattern in a hole type nozzle?

A

The number and arrangement of the orifices.

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4
Q

What is used to send a signal to fire an electronic fuel injector?

A

ECM

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5
Q

What are the common types of fuel injection systems?

A

(1) Multiple Plunger in-line.
(2) Cummins PT.
(3) Distributive.
(4) Electronic.

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6
Q

How much pressure does a Cummins PT fuel pump supply to the injectors?

A

About 250 psi

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7
Q

What determines the amount of fuel that reaches the combustion chamber as engine speed decreases?

A

The lower fuel pressure and longer time the injector is open.

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8
Q

What are the three main rotating components in a Roosa Master distributive-type injector pump?

A

(1) The drive shaft.
(2) The distributor rotor.
(3) The transfer pump.

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9
Q

What are the major components of an electronic fuel injection system?

A

(1) Pump.
(2) Common rail.
(3) Fuel injectors.
(4) ECM.

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10
Q

When you are bleeding a fuel system, when do you close the bleed valve or fuel line?

A

When air-free fuel is flowing.

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11
Q

What happens if you do not tighten the fuel strainer to the correct tightness?

A

It over compresses the gasket and shortens its life, which could cause leaks. It also makes it nearly impossible to remove the filter the next time it is due service.

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12
Q

Where do you put the water finding paste on the tip of a dipstick?

A

About the lower two inches.

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13
Q

What are the possible causes for excessive black exhaust?

A

(1) Improper fuel.

(2) Defective injector.

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14
Q

If an engine is running erratically and air is discovered in the fuel system, what corrective measures should be taken?

A

Bleed the fuel lines.

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15
Q

What are the main components of an electronic governor?

A

(1) Magnetic Pickup
(2) Electronic control unit.
(3) Actuator.

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16
Q

What type of voltage does a magnetic pickup produce?

A

AC

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17
Q

What does an ECU do?

A

It takes the AC signal from the mag pickup, changes it to DC and compares it to a reference voltage. It then decides if the engine is operating too fast or slow or at the right speed. It then provides an output to the actuator that makes any adjustments necessary to the engine speed

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18
Q

What are the main components of an actuator?

A

(1) Coil.
(2) Swing arm.
(3) Spring.

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19
Q

What are the steps of an electronic governor inspection?

A

Visually inspecting the governor control unit, actuator, and Inspect the governor control unit wires for any signs of deterioration, cracking, or overheating.

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20
Q

Faulty components can lead to what engine malfunctions?

A

(1) Incorrect engine responses to load changes.
(2) Hunting and surging.
(3) Total system shut down.

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21
Q

Where do you find initial adjustments after replacing an ECU?

A

T.O. or manufacturer’s manual.

22
Q

Why do you not turn a MPU in more than one eight of a turn at a time?

A

Prevents damage to the MPU.

23
Q

How would a generator respond if gain is set to high?

A

The engine would run erratically.

24
Q

When would you make speed adjustments?

A

When you initially install the governor control module in the unit.

25
Q

Why are droop adjustments needed?

A

When operating two or more generators in parallel, two isochronous generators would fight each other to control system frequency.

26
Q

How are speed switch typically tested?

A

Slowly increasing the speed of the engine using the frequency-adjusting knob until the engine shuts down on an overspeed fault.

27
Q

If a generator has contaminated or improper fuel type, what corrective measures should be taken?

A

Drain the fuel supply and replace with the proper fuel.

28
Q

Identify the component that maintains the day tanks at the correct level without overflowing them?

a. Float valves.
b. Holding relay.
c. Limit switches.
d. Laser level detectors.

A

A. Float Valves

29
Q

As the plunger of a mechanical injector moves up, what allows fuel to flow into the injector cup?

a. Closing the spray cup.
b. Opening the metering orifice.
c. Opening the injector spray nozzle.
d. Pressure of the fuel in the cup increases

A

B. Opening the metering orifice

30
Q

How high can the pressure be in a hydraulic fuel injector?

a. 500 pounds per square inch (psi).
b. 1,500 psi.
c. 5,000 psi.
d. 10,000 psi.

A

C. 5,000 psi

31
Q

What happens when the pressure of the fuel overcomes the pressure of the spring in a hydraulic injector?

a. Nozzle needle moves upward.
b. Valve train opens the needle valve.
c. Spring holds the needle valve closed.
d. The fuel circulates through the injector.

A

A. Nozzle needle moves upward

32
Q

The type of hydraulic injector nozzle that only has one hole and creates a cone shaped spray pattern is called

a. flat.
b. hole.
c. pintle.
d. protruding.

A

C. Pintle

33
Q

Which type of hydraulic injector nozzle uses multiple orifices set at an angle?

a. Flat.
b. Hole.
c. Pintle.
d. Protruding.

A

B. Hole

34
Q

Which component drives the pumps in a multiple plunger inline fuel injection system?

a. Internal gear.
b. External gear.
c. Internal camshaft.
d. External camshaft

A

C. Internal camshaft

35
Q

Which factor determines the amount of fuel delivered to the cylinder for combustion in a port and helix fuel injection system?

a. Height of the cam lobe.
b. The rational speed of the camshaft.
c. Position of the helix in relation to the port.
d. Spring tension of the delivery valve.

A

C. Position of the helix in relation to the port.

36
Q

As engine speed increases with a pressure timed (PT) fuel injection system, what does the increase in pressure, fuel, and the shorter amount of time the injector opens determine?

a. How long the fuel stays in the injector.
b. The amount of fuel reaching the day tank.
c. How much fuel reaches the combustion chamber.
d. The amount of fuel that circulates through the pump.

A

D. The amount of fuel that circulates through the pump.

37
Q

In a Roosa Master type of distributor-type injection pump, what do the pistons follow to pressurize the fuel?

a. Plungers.
b. Cam ring.
c. Cam shaft.
d. Valve train.

A

B. Cam Ring

38
Q

Which fuel line do you open when bleeding and priming a diesel fuel system?

a. It does not matter which one.
b. The one at the lowest point.
c. The one at the highest point.
d. The one going to the first cylinder in the firing order.

A

C. The one at the highest point.

39
Q

A helpful step when bleeding and priming a diesel fuel system is to

a. make sure the fuel filters and strainers are full of fuel.
b. make sure that only the fuel filters are full of fuel.
c. fill the fuel filters and strainers with oil.
d. fill the fuel filters with oil.

A

A. Make sure the fuel filters and strainers are full of fuel.

40
Q

Which item(s) is visually inspected on a fuel injection pump?

a. Paint.
b. Gears.
c. Inlet strainer.
d. Security of lines and mounting bolts.

A

D. Security of lines and mounting bolts.

41
Q

As a safety precaution why must you limit your exposure to diesel fuel?

a. It may spontaneously ignite at room temperature.
b. Fuel is a carcinogen and may cause cancer.
c. Fuel will not wash off your hands.
d. Fuel causes fingernails to fall off.

A

B. Fuel is a carcinogen and may cause cancer.

42
Q

Why is it important to mark the wires when replacing a fuel level sending unit?

a. It allows maintenance without disconnecting the battery.
b. So you can reinstall the sending unit correctly.
c. Ensures the generator will not start.
d. Tagging is not needed.

A

B. So you can reinstall the sending unit correctly.

43
Q

Identify the possible cause(s) for excessive black engine smoke.

a. Improper fuel only.
b. Air in the fuel system.
c. Improper fuel or defective injector.
d. Defective injector only.

A

C. Improper fuel or defective injector.

44
Q

What would be the corrective action if a generator has improper or contaminated fuel?

a. Treat with Docosahexaenoic Acid (DHA).
b. Add the proper amount of lubrication.
c. Run it through the system till it is all gone.
d. Drain the fuel and replace with proper fuel.

A

D. Drain the fuel and replace with proper fuel

45
Q

Which electronic governor component uses a back and forth movement of a magnetic field to induce alternating current (AC) voltage in the coil?

a. Actuator.
b. Power piston.
c. Magnetic pickup (MPU).
d. Electronic control unit (ECU).

A

C. Magnetic pickup (MPU)

46
Q

Which electronic governor component is the brain of the governor?

a. Actuator.
b. Power piston.
c. Magnetic pickup (MPU).
d. Electronic control unit (ECU).

A

D. Electronic Control Unit (ECU)

47
Q

When you are making adjustments to the magnetic pickup, the maximum distance you should turn it inward at any time is

a. 1/8 turn.
b. 1⁄4 turn.
c. 1⁄2 turn.
d. 1 turn.

A

A. 1/8 turn.

48
Q

What would you adjust on an electronic governor if a generator is running erratically?

a. Gain.
b. Droop.
c. Stability.
d. Running speed.

A

A. Gain

49
Q

Which electronic governor adjustment would you use if the generator is running below the desired speed?

a. Gain.
b. Droop.
c. Stability.
d. Running speed.

A

D. Running Speed

50
Q

Which electronic governor adjustment would you use if a generator running in parallel is taking too much of the load?

a. Gain.
b. Droop.
c. Stability.
d. Running speed.

A

B. droop

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