Question 1

The length of the bolt is measured from the top of the head to the bottom of the thread.

Accepted Answer

The length of a bolt is typically measured from the underside of the head to the end of the thread, not from the top of the head.

Question 2

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

Accepted Answer

This is true. The vacuum gauge needs to be connected directly to the intake manifold in order to accurately measure the engine's vacuum pressure.

Question 3

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

Accepted Answer

Thrust wear can cause uneven wear on the cylinder walls, leading to an out-of-round shape. This can result in poor compression, loss of power, and other engine issues.

Question 4

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 because aligning a tooth of the ring with the center of the sensor ensures accurate air gap measurement. Non-magnetic feeler gauges can be used for this purpose, so Technician A's statement is incorrect.

Question 5

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

Accepted Answer

This statement is false. Pressure gauges are available in various ranges including ones that read less than 10 lbs per square inch. However, some pressure gauges can also read higher than 10 lbs per square inch depending on their application.

Question 6

Threaded fasteners are the least common fastener type.

Accepted Answer

Threaded fasteners, such as screws and bolts, are actually one of the most common types of fasteners.

Question 7

Two technicians are discussing snaprings. Technician A says that snaprings are made from high-quality aluminum. Technician B says that snaprings may be internal or external. Who is correct?
A) A only
B) B only
C) Both A and B
D) Neither A nor B

Accepted Answer

Technician A is incorrect because snaprings are typically made of steel or other types of metal, not aluminum. Technician B is correct in saying that snaprings can be either internal or external.

Question 8

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

Technician A is correct that extension spindles allow the measurement of cylinder bores as they allow the micrometer to reach deep into the bore. Technician B is also correct that once the micrometer is inserted into the bore and extended, it should be tightened and removed, as this ensures accurate measurement and avoids any damage to the micrometer or the bore. Therefore, both technicians are correct.

Question 9

Spark plug gaps are measured with a round feeler gauge

Accepted Answer

Spark plug gaps are indeed measured with a round feeler gauge, as the round gauge can accurately measure the gap between the spark plug electrode and center electrode.

Question 10

Washers help to distribute the clamping load on a part.

Accepted Answer

Washers can help to evenly distribute the clamping load on a part, reducing the risk of deformation or damage to the surface.

Question 11

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. When measuring bearing journals, it is important to measure on a machined surface to ensure accuracy. Unmachined surfaces may have imperfections or irregularities that can affect the measurement.

Question 12

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. It is indeed critical that spark plug gap be set and a round wire feeler gauge is commonly used to measure the gap.

Question 13

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

Accepted Answer

Outside micrometers are typically used to measure the diameter of cylindrical objects such as journals or shafts, including checking for out-of-roundness.

Question 14

What is true of washers?
A) A flat washer is used between a nut and a component to distribute load.
B) Lock washers have either external or internal teeth.
C) Spring lock washers have two sharp edges.
D) Flat washers are split.

Accepted Answer

Flat washers are used to distribute load and prevent damage to the surface being fastened. Lock washers have external or internal teeth to prevent loosening of the fastener. Spring lock washers have a split and bent shape to provide tension and prevent loosening. However, none of the options given in the question accurately describe spring lock washers.

Question 15

Two technicians are discussing U.S. thread sizes. Technician A says fastener threads can be fine or coarse. Technician B says that fine threads provide greater holding strength in soft materials. Who is correct?
A) A only
B) B only
C) Both A and B
D) Neither A nor B

Accepted Answer

Fastener threads can indeed be categorized as fine or coarse. Fine threads generally provide greater holding strength in hard materials, not soft materials, due to their larger minor diameter and more threads per inch.

Question 16

Two technicians are speaking about helicoils. Technician A says helicoils can be threaded into a properly prepared hole to repair damaged threads. Technician B says helicoils can be used to make external threads on a shaft or rod. Who is correct?
A) A only
B) B only
C) Both A and B
D) Neither A nor B

Accepted Answer

Helicoils are primarily used for thread repair, so Technician A is correct. Technician B's statement is incorrect as helicoils are not used for making external threads on a shaft or rod, but are used to repair internal threads.

Question 17

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 may be a sign of wear, but it is not an accurate way to measure it. Therefore, option C is the correct choice. Options A, B, and D are all incorrect as they either make false statements or are irrelevant to the topic.

Question 18

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

Accepted Answer

Runout is a common term used in machining and engineering to describe the degree of wobble or variation from perfect roundness in a rotating wheel or disc.

Question 19

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. A wider gap will require more energy to create a spark, which results in a weaker spark. Technician B is incorrect as a narrower gap will also require more energy to create a spark, leading to a weaker spark.

Question 20

Speed sensors use a toothed ring to trigger the sensor.

Accepted Answer

Speed sensors typically use a toothed ring or reluctor wheel to trigger the sensor and determine the speed of a rotating component, such as a wheel or camshaft.

Quiz 4: Fasteners and Measurements

The length of the bolt is measured from the top of the head to the bottom of the thread.

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

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

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?

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

Threaded fasteners are the least common fastener type.

Two technicians are discussing snaprings. Technician A says that snaprings are made from high-quality aluminum. Technician B says that snaprings may be internal or external. 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?

Spark plug gaps are measured with a round feeler gauge

Washers help to distribute the clamping load on a part.

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?

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?

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

What is true of washers?

Two technicians are discussing U.S. thread sizes. Technician A says fastener threads can be fine or coarse. Technician B says that fine threads provide greater holding strength in soft materials. Who is correct?

Two technicians are speaking about helicoils. Technician A says helicoils can be threaded into a properly prepared hole to repair damaged threads. Technician B says helicoils can be used to make external threads on a shaft or rod. Who is correct?

What is true about measuring shaft diameter and wear?

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

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?

Speed sensors use a toothed ring to trigger the sensor.