Question 1

Which type of governor senses changes in engine load and automatically adjusts the fuel rate to compensate for load changes?
A)Variable speed.
B)Automotive.
C)Pneumatic.
D)Overspeed.

Accepted Answer

A

Question 2

The difference between maximum engine speed with a load applied and a no-load speed is often known as _________.
A)speed droop
B)stability
C)underrun
D)overrun

Accepted Answer

Speed droop refers to the decrease in engine speed when a load is applied compared to the no-load speed.

Question 3

What type of engine emission is controlled by the air-fuel ratio device? A)Oxides of nitrogen (NO_x). B)Carbon monoxide (CO). C)Particulate matter (PM). D)Hydrocarbons (HCs).

Accepted Answer

C

Question 4

Which of the following torque rise and transmission configurations is best used in an automobile?
A)A high torque rise engine with few transmission gear steps.
B)A low torque rise engine with many transmission gear steps.
C)A high torque rise engine with overdrive transmission gear steps.
D)A low torque rise engine with few transmission gear steps.

Accepted Answer

A low torque rise engine with many transmission gear steps is ideal as it allows the engine to operate efficiently across a wide range of speeds, providing smooth acceleration and better fuel economy.

Question 5

Which of the following features is used to prevent driveline windup or jerking during vehicle deceleration?
A)Load controllers.
B)Air-fuel ratio control device.
C)Isochronous governor.
D)Variable-speed governor.

Accepted Answer

Load controllers are used to manage the distribution of power and prevent driveline windup or jerking during vehicle deceleration by adjusting the load on the driveline.

Question 6

Technician A says that a cam position sensor can sense engine speed and position. Technician B says that a crankshaft position sensor can sense engine speed and position Who is correct?
A)Technician A
B)Technician B
C)Both A and B
D)Neither A nor B

Accepted Answer

Both the cam position sensor and the crankshaft position sensor can sense engine speed and position. The cam position sensor helps in determining the position of the camshaft, which is crucial for timing the fuel injection and ignition, while the crankshaft position sensor provides information about the engine speed and the position of the pistons.

Question 7

While discussing possible causes of a low-power problem in an engine that uses a mechanical governor, Technician A says that weak governor springs can cause the problem. Technician B says that a leaking tube connecting the intake manifold and air-fuel ratio control device can cause the problem. Who is correct?
A)Technician A
B)Technician B
C)Both A and B
D)Neither A nor B

Accepted Answer

Weak governor springs can cause improper engine speed control, leading to low power. A leaking tube can affect the air-fuel mixture, also causing low power.

Question 8

Technicians A and B are discussing which engine would be best to use to pull tree stumps from some land on a farm. The choice is between two engines in two different medium-duty pickup trucks. Technician A says the engine with a peak torque of 850 ft-lb (1,152 N·m) and 325 horsepower (242 kW) is ideal for pulling stumps. Technician B says the other truck, with an engine with a peak torque of 650 ft-lb (881 N·m) and 400 horsepower (198 kW) is better. Who is correct?
A)Technician A
B)Technician B
C)Both A and B
D)Neither A nor B

Accepted Answer

The answer of Technicians A and B are discussing which...

Question 9

Technician A says that a diesel engine needs a governor to prevent a commercial vehicle from wasting fuel. Technician B says that a diesel engine needs a governor to regulate fuel delivery because diesels are very sensitive to slight changes in the amount of fuel injected and can overspeed. Who is correct?
A)Technician A
B)Technician B
C)Both A and B
D)Neither A nor B

Accepted Answer

Technician B is correct because diesel engines require a governor to regulate fuel delivery and prevent overspeeding due to their sensitivity to fuel injection changes.

Question 10

Which type of governor requires the operator to adjust engine speed when the load that is applied to an engine changes?
A)Variable speed.
B)Limiting speed (LS).
C)Hydraulic.
D)Servo.

Accepted Answer

A Limiting Speed (LS) governor requires manual adjustment by the operator to maintain engine speed when the load changes.

Question 11

Which type of governor will be commonly used to control the fueling of a diesel electric generator?
A)Isochronus.
B)Hydraulic.
C)Load limiting.
D)Overspeed.

Accepted Answer

Isochronous governors are commonly used in diesel electric generators to maintain a constant speed and frequency, ensuring stable power output.

Question 12

During which one of the following conditions will the tension of the starting spring or governor spring of a mechanical governor usually be greater than flyweight force?
A)During cranking.
B)While the engine is at idle.
C)While the engine is at high idle.
D)While the engine is at rated rpm.

Accepted Answer

During cranking, the engine speed is very low, so the flyweights do not generate enough centrifugal force to overcome the tension of the governor spring, resulting in the spring tension being greater than the flyweight force.

Question 13

Technician A says that any type of governor will always attempt to maintain engine idle speed even if two or three cylinders are misfiring. Technician B says that only a variable-speed governor will compensate for a misfire loss from one or two cylinders and maintain idle speed. Who is correct?
A)Technician A
B)Technician B
C)Both A and B
D)Neither A nor B

Accepted Answer

The answer of Technician A says that any type of...

Question 14

Technician A says that any type of governor will work well when pulling heavy loads in off-road conditions without surging and causing driveline damage. Technician B says that an automotive governor is best suited to those operating conditions. Who is correct?
A)Technician A
B)Technician B
C)Both A and B
D)Neither A nor B

Accepted Answer

Neither technician is correct because not all governors are suitable for heavy loads in off-road conditions, and an automotive governor may not be the best choice for such demanding environments.

Question 15

Technicians A and B are making programmable parameter adjustments for the governor used by an engine to drive a PTO that is operating a hydraulic pump on a landscaping truck. Technician A says that the PTO throttle switch should be configured so that the engine governor that drives the PTO is a variable-speed governor. Technician B says that the engine should be set up to use an automotive-type governor when the PTO is operating. Who is correct?
A)Technician A
B)Technician B
C)Both A and B
D)Neither A nor B

Accepted Answer

A variable-speed governor is appropriate for PTO applications as it allows for precise control of engine speed to match the demands of the hydraulic pump. An automotive-type governor is not suitable for this application.

Question 16

Technician A says that when starting a mechanically governed diesel engine, it is important to push the accelerator pedal to the floor once and then release it. Technician B says the injection pump will automatically go to part throttle when cranking, and so nothing needs to be done. Who is correct?
A)Technician A
B)Technician B
C)Both A and B
D)Neither A nor B

Accepted Answer

Technician A is correct because pushing the accelerator pedal to the floor once and then releasing it will allow the injection pump to go to full throttle, which will help the engine to start.

Question 17

Which one of the following would likely result if the line that connects mechanical air-fuel ratio control device to the turbocharger compressor outlet were broken?
A)Heavy black smoke during acceleration.
B)Poor fuel economy
C)Excessive engine speed.
D)Low power.

Accepted Answer

The answer of Which one of the following would likely...

Question 18

While advising a customer about the consequences of increasing maximum engine rpm with an after market software program that alters the engine calibration and increases power output. Technician A says that the engine will produce more smoke. Technician B says the problem with emissions can be corrected by adjusting the air-fuel ratio control. Who is correct?
A)Technician A
B)Technician B
C)Both A and B
D)Neither A nor B

Accepted Answer

The answer of While advising a customer about the consequences...

Question 19

Technician A says that the units on a scanner for a fuel pressure regulator energized by a PWM signal will be reported in volts and amps of electrical current. Technician B says that the units for a PWM signal may be reported as a percentage or in milliseconds Who is correct?
A)Technician A
B)Technician B
C)Both A and B
D)Neither A nor B

Accepted Answer

Both technicians are correct. The units for a scanner for a fuel pressure regulator energized by a PWM signal can be reported in volts and amps of electrical current, and the units for a PWM signal may be reported as a percentage or in milliseconds.

Question 20

Controlling an output device by using feedback from a single sensor is referred to as _________.
A)model predictive control (MPC)
B)proportional-integral-derivative (PID) control
C)closed-loop feedback
D)open-loop feedback

Accepted Answer

Closed-loop feedback involves using feedback from sensors to control an output device, adjusting the system based on the feedback received.

Quiz 10: Governors and Electronic Control Systems

Which type of governor senses changes in engine load and automatically adjusts the fuel rate to compensate for load changes?

The difference between maximum engine speed with a load applied and a no-load speed is often known as _________.

What type of engine emission is controlled by the air-fuel ratio device?

Which of the following torque rise and transmission configurations is best used in an automobile?

Which of the following features is used to prevent driveline windup or jerking during vehicle deceleration?

Technician A says that a cam position sensor can sense engine speed and position. Technician B says that a crankshaft position sensor can sense engine speed and position Who is correct?

Which type of governor requires the operator to adjust engine speed when the load that is applied to an engine changes?

Which type of governor will be commonly used to control the fueling of a diesel electric generator?

During which one of the following conditions will the tension of the starting spring or governor spring of a mechanical governor usually be greater than flyweight force?

Technician A says that any type of governor will always attempt to maintain engine idle speed even if two or three cylinders are misfiring. Technician B says that only a variable-speed governor will compensate for a misfire loss from one or two cylinders and maintain idle speed. Who is correct?

Technician A says that any type of governor will work well when pulling heavy loads in off-road conditions without surging and causing driveline damage. Technician B says that an automotive governor is best suited to those operating conditions. Who is correct?

Which one of the following would likely result if the line that connects mechanical air-fuel ratio control device to the turbocharger compressor outlet were broken?

Technician A says that the units on a scanner for a fuel pressure regulator energized by a PWM signal will be reported in volts and amps of electrical current. Technician B says that the units for a PWM signal may be reported as a percentage or in milliseconds Who is correct?

Controlling an output device by using feedback from a single sensor is referred to as _________.