Question 1

Technician A says the injector balance tester leads must be connected to the battery with the correct polarity. Technician B says the injector balance tester contains a timing circuit. Who is correct?

Accepted Answer

Both technicians are correct. Technician A is correct because the injector balance tester, like many electrical diagnostic tools, requires correct polarity connection to the battery to function properly. Technician B is correct because an injector balance tester typically contains a timing circuit to measure the time it takes for each injector to respond, which is crucial for diagnosing injector performance issues.

Question 2

A torque angle gauge is used to measure ______.

Accepted Answer

A torque angle gauge is specifically designed to measure the amount of additional twist (angle) applied to a bolt or nut after the initial torque is applied. This is a critical step in many torquing procedures to ensure proper preload and clamping force.

Question 3

Ridge reamers are being discussed. Technician A says the reamer removes the unworn metal that lies above the ring travel. Technician B says to remove the ridge after removing the piston. Who is correct?

Accepted Answer

Technician A is correct because a ridge reamer is used to remove the unworn metal at the top of the cylinder that is not touched by the piston rings, which forms a ridge over time. Technician B is incorrect because the ridge should be removed before removing the piston to prevent damage to the piston or rings.

Question 4

A pyrometer is used to measure ______.

Accepted Answer

A pyrometer is specifically designed to measure high temperatures, often in environments or processes where it is not possible to use traditional methods of temperature measurement.

Question 5

Brake-cleaning machines are being discussed. Technician A uses a negative pressure (vacuum)enclosure with a HEPA filter. Technician B uses a low-pressure wet cleaning system using water mixed with an organic solvent. Who is correct?

Accepted Answer

Both techniques described by Technician A and Technician B are recognized and acceptable methods for cleaning brakes, focusing on minimizing the release of harmful dust and using environmentally safer solvents.

Question 6

Technician A says a drum micrometer is used to measure the inside diameter of a brake drum. Technician B says a drum micrometer only measures metric drums. Who is correct?

Accepted Answer

Technician A is correct because a drum micrometer is indeed used to measure the inside diameter of a brake drum. Technician B is incorrect because a drum micrometer can measure drums in both metric and imperial units, not just metric.

Question 7

Vacuum leak testing is being discussed. Technician A  says to use a vacuum pump to check each component. Technician B says to use an ultrasonic tester. Who is correct?

Accepted Answer

Both techniques are valid for vacuum leak testing. A vacuum pump can be used to apply a vacuum to the system and check for leaks by observing if the vacuum holds. An ultrasonic tester can detect the high-frequency sounds produced by air or gas escaping from a leak, even in a vacuum environment.

Question 8

A refrigerant recycling/recharging station performs all the following functions EXCEPT:

Accepted Answer

Identifying the type of refrigerant in the system is not a function of a refrigerant recycling/recharging station. These stations are designed to remove refrigerant, evacuate the A/C system, and recharge it, but not to identify refrigerant types.

Question 9

A pyrometer can be used to measure all the following EXCEPT:

Accepted Answer

A pyrometer is designed to measure high temperatures, typically in engines or exhaust systems, but it cannot detect or measure exhaust leaks, as those are related to the presence or absence of gases rather than their temperature.

Question 10

Which of the following answers is NOT a type of ring compressor?

Accepted Answer

C-clamp type is not a type of ring compressor. Ring compressors are tools used to compress piston rings to fit into the cylinder bore, and they typically come in forms such as wrinkle band, adjustable band with ratchet, and band and pliers, but not in a C-clamp type.

Question 11

All the following are types of valve spring compressors EXCEPT:

Accepted Answer

The correct types of valve spring compressors include pry-bar type, C-clamp type, and plunger type. D-clamp type is not a recognized type of valve spring compressor.

Question 12

Most exhaust gas analyzers can measure ______.

Accepted Answer

Most exhaust gas analyzers are designed to measure a variety of emissions from vehicles, including hydrocarbons (HC), carbon monoxide (CO), and oxides of nitrogen (NOx).

Question 13

Technician A uses a pipe wrench to adjust a tie-rod sleeve. Technician B uses a tie-rod sleeve adjusting tool. Who is correct?

Accepted Answer

Technician B is correct because using a tie-rod sleeve adjusting tool is the proper method for adjusting a tie-rod sleeve. A pipe wrench could damage the sleeve or the tie-rod ends.

Question 14

Manifold vacuum is formed on the piston's ______ stroke.

Accepted Answer

Manifold vacuum is formed during the intake stroke when the piston moves downward, creating a vacuum that draws the air-fuel mixture into the combustion chamber.

Question 15

Control arm bushings are typically removed with ______.

Accepted Answer

The answer of Control arm bushings are typically removed with...

Question 16

A noid light is used to check the ______.

Accepted Answer

A noid light is a diagnostic tool used specifically to check the electrical signal to a fuel injector, indicating if the fuel injector is receiving the correct electrical pulse to open and inject fuel.

Question 17

Lab scopes are being discussed. Technician A says the lab scope displays the resistance of a sensor as it changes over time. Technician B says some lab scopes can display two waveforms at the same time. Who is correct?

Accepted Answer

Technician B is correct because lab scopes can indeed display multiple waveforms simultaneously, allowing for the comparison of different signals over time. Technician A is incorrect because lab scopes display voltage over time, not resistance.

Question 18

A logic probe is used to detect ______.

Accepted Answer

A logic probe is specifically designed to detect digital or pulsed (on-off) signals, making it a useful tool for troubleshooting digital circuits. It is not designed for detecting continuity or shorts to ground, which are functions typically associated with a multimeter.

Question 19

A timing light checks the ignition timing in relation to the ____ position.

Accepted Answer

A timing light is used to check the ignition timing in relation to the crankshaft position, ensuring that the spark occurs at the correct moment in the engine's cycle for optimal performance.

Question 20

An inclinometer is used to measure ______.

Accepted Answer

An inclinometer is used to measure drive shaft angles, which is crucial for ensuring that the drive shaft operates efficiently and without excessive wear or vibration.

Quiz 6: Diagnostic Equipment and Special Tools