Question 1

What is true about measuring shaft diameter and wear?
A)If a shop does not overhaul motors, measurements are not made.
B)Measurements only need to be made in one location.
C)Noise does not accurately determine wear.
D)Micrometers only come in metric.

Accepted Answer

Noise can be caused by various factors and may not accurately determine the wear of a shaft. Therefore, relying solely on noise as an indicator of wear may not be accurate. The other options are incorrect as measuring shaft diameter and wear is important for maintenance and performance and measurements should be taken at various locations using appropriate tools such as micrometers which come in both metric and imperial units.

Question 2

Two technicians are discussing measuring bearing journals. Technician A says that measurements should be made on a machined area. Technician B says that unmachined areas are typically measured. Who is correct?
A)A only
B)B only
C)Both A and B
D)Neither A nor B

Accepted Answer

Technician A is correct. The measurements should be made on a machined area because that area provides the most accurate measurement. Unmachined areas may have imperfections that could affect the accuracy of the measurement.

Question 3

You should still measure severely damaged journals before replacing the part.

Accepted Answer

False

Question 4

Two technicians are discussing journal measurements. Technician A says that two measurements are not necessary. Technician B says an out-of-round journal will not affect bearing life. Who is correct?
A)A only
B)B only
C)Both A and B
D)Neither A nor B

Accepted Answer

Two measurements are necessary to determine if a journal is out-of-round. An out-of-round journal will affect bearing life because it will cause the bearing to wear unevenly.

Question 5

Two technicians are discussing bore measurements. Technician A says that bores can be measured at the top with an outside micrometer. Technician B says that bores must be measured from the inside with a telescoping gauge. Who is correct?
A)A only
B)B only
C)Both A and B
D)Neither A nor B

Accepted Answer

Technician B is correct in saying that bores must be measured from the inside with a telescoping gauge. Outside micrometers are not suitable for measuring internal bores as they are designed to measure the outer diameter of an object. Telescoping gauges, on the other hand, are specifically designed to measure internal bores and can provide accurate measurements. Therefore, Technician A's statement is incorrect.

Question 6

Two technicians are discussing measuring bores with inside micrometers. Technician A says that extension spindles allow the measurement of cylinder bores. Technician B says that once the micrometer is inserted into the bore and extended, it should be tightened and removed. Who is correct?
A)A only
B)B only
C)Both A and B
D)Neither A nor B

Accepted Answer

Both technicians are correct. Extension spindles are needed to measure deep cylinder bores, and once the micrometer is extended, it should be tightened before removing it to ensure accuracy.

Question 7

Speed sensors use a toothed ring to trigger the sensor.

Accepted Answer

Speed sensors commonly use a magnetic or hall effect sensor to detect the passing of teeth on a toothed ring. This is known as a variable reluctance sensor.

Question 8

Outside micrometers are used to measure journals or shafts to check for out-of-round.

Accepted Answer

Outside micrometers are commonly used to measure the diameter of cylindrical objects, such as journals or shafts, to check for out-of-roundness or taper. Inside micrometers are used to measure the diameter of holes or bores.

Question 9

A bore measurement must be made with what two tools?
A)An inside micrometer and a ruler
B)Calipers and an outside micrometer
C)An outside micrometer and a telescoping gauge
D)A ruler and a telescoping gauge

Accepted Answer

A bore measurement requires measuring the inside diameter of a hole or cylinder. The best tools for this are an outside micrometer and a telescoping gauge. The outside micrometer can measure the diameter accurately and the telescoping gauge can verify the roundness and uniformity of the bore. Calipers can be used to measure a bore, but they are not as accurate as a micrometer. A ruler cannot accurately measure the diameter of a bore.

Question 10

Spark plug gaps are measured with a round feeler gauge

Accepted Answer

Spark plug gaps are typically measured with a round feeler gauge that has different thicknesses of blades to determine the correct gap for the specific spark plug being used.

Question 11

Use a dial indicator to measure shaft endplay.

Accepted Answer

A dial indicator is commonly used to measure the end play or axial movement of a shaft.

Question 12

Runout is a term used to determine if there is a wobble in a wheel or disc.

Accepted Answer

This is correct, runout refers to the measurement of any wobble or deviation from a perfect circle in a wheel or disc as it rotates.

Question 13

Two technicians are discussing spark plug gaps. Technician A says that it is critical that spark plug gap be set. Technician B says that a round wire feeler gauge is used to measure gap. Who is correct?
A)A only
B)B only
C)Both A and B
D)Neither A nor B

Accepted Answer

Both technicians are correct. Spark plug gap is an important parameter and needs to be set accurately for proper engine performance. A round wire feeler gauge is commonly used to measure the gap between the center and ground electrodes of a spark plug. Therefore, both Technician A and Technician B are correct.

Question 14

Technician A and technician B are discussing spark plug gap. Technician A says that the spark may be weak in strength if the gap is too wide. Technician B says that the spark will have high-voltage if the gap is too narrow. Who is correct?
A)A only
B)B only
C)Both A and B
D)Neither A nor B

Accepted Answer

Technician A is correct because if the gap is too wide, it will be more difficult for the spark to jump the gap, resulting in a weaker spark. Technician B is incorrect because if the gap is too narrow, it will be easier for the spark to jump the gap, but the high voltage can result in damage to the ignition system or engine components.

Question 15

Thrust wear can contribute to out-of-round cylinders.

Accepted Answer

Thrust wear can cause the piston to move erratically in the cylinder, leading to uneven wear and out-of-round cylinders.

Question 16

Two technicians are discussing runout. Technician A says that runout won't affect vehicle operation. Technician B says that runout can cause severe vibration. Who is correct?
A)A only
B)B only
C)Both A and B
D)Neither A nor B

Accepted Answer

Technician B is correct. Runout is an issue that causes the wheel to wobble or move off-center. This can cause the vehicle to vibrate severely and affect its operation. Technician A's statement is incorrect.

Question 17

Two technicians are discussing air gap measurements. Technician A says that non-magnetic feeler gauges should never be used. Technician B says that measurements should be made with a tooth of the ring aligned with the center of the sensor. Who is correct?
A)A only
B)B only
C)Both A and B
D)Neither A nor B

Accepted Answer

Technician B is correct. Air gap measurements should be made with a tooth of the ring aligned with the center of the sensor. This ensures accuracy and consistency in the measurements. Technician A is incorrect because non-magnetic feeler gauges can be used for air gap measurements as long as they are made of the correct material, such as brass or plastic. Using a magnetic gauge can interfere with the sensor's readings.

Question 18

When measuring engine vacuum, a vacuum gauge is connected to a port that is directly tapped into the intake manifold

Accepted Answer

A vacuum gauge is typically connected to a port on the intake manifold to directly measure engine vacuum.

Question 19

Pressure gauges always read less than 10 lbs per square inch.

Accepted Answer

This statement is false. Pressure gauges can measure a range of pressures, well beyond 10 lbs per square inch.

Question 20

Tire pressures should be checked when the tires have been warmed up.

Accepted Answer

Tire pressures should be checked when the tires are cold, as the heat generated while driving can cause the pressure to increase and give false readings.

Quiz 4: Measurements and Precision Measuring Devices Precision Measurements

What is true about measuring shaft diameter and wear?

Two technicians are discussing measuring bearing journals. Technician A says that measurements should be made on a machined area. Technician B says that unmachined areas are typically measured. Who is correct?

You should still measure severely damaged journals before replacing the part.

Two technicians are discussing journal measurements. Technician A says that two measurements are not necessary. Technician B says an out-of-round journal will not affect bearing life. Who is correct?

Two technicians are discussing bore measurements. Technician A says that bores can be measured at the top with an outside micrometer. Technician B says that bores must be measured from the inside with a telescoping gauge. Who is correct?

Two technicians are discussing measuring bores with inside micrometers. Technician A says that extension spindles allow the measurement of cylinder bores. Technician B says that once the micrometer is inserted into the bore and extended, it should be tightened and removed. Who is correct?

Speed sensors use a toothed ring to trigger the sensor.

Outside micrometers are used to measure journals or shafts to check for out-of-round.

A bore measurement must be made with what two tools?

Spark plug gaps are measured with a round feeler gauge

Use a dial indicator to measure shaft endplay.

Runout is a term used to determine if there is a wobble in a wheel or disc.

Two technicians are discussing spark plug gaps. Technician A says that it is critical that spark plug gap be set. Technician B says that a round wire feeler gauge is used to measure gap. Who is correct?

Technician A and technician B are discussing spark plug gap. Technician A says that the spark may be weak in strength if the gap is too wide. Technician B says that the spark will have high-voltage if the gap is too narrow. Who is correct?

Thrust wear can contribute to out-of-round cylinders.

Two technicians are discussing runout. Technician A says that runout won't affect vehicle operation. Technician B says that runout can cause severe vibration. Who is correct?

Two technicians are discussing air gap measurements. Technician A says that non-magnetic feeler gauges should never be used. Technician B says that measurements should be made with a tooth of the ring aligned with the center of the sensor. Who is correct?

When measuring engine vacuum, a vacuum gauge is connected to a port that is directly tapped into the intake manifold

Pressure gauges always read less than 10 lbs per square inch.

Tire pressures should be checked when the tires have been warmed up.