ASE Electrical PR. 4

Front

A full-fielded 70 amp alternator only produces 45 amps. What is the MOST likely cause?

Back

A burned diode.

Answer explanation

A burned diode in the alternator can cause reduced output current. Since the alternator is rated for 70 amps but only produces 45 amps, this indicates a failure in the rectification process, likely due to a burned diode.

Front

Which component is LEAST likely to cause intermittent operation of a vehicle's cruise control? Options: Vehicle Speed Sensor, Brake Switch, Throttle Position Sensor

Back

Turn Signal Switch

Answer explanation

The Turn Signal Switch is primarily used for signaling and does not directly affect cruise control operation. In contrast, the Vehicle Speed Sensor, Brake Switch, and Throttle Position Sensor are critical for cruise control functionality.

Front

After replacing the door lock relay, the door locks still do not operate. What is MOST likely causing this?

Back

The wrong type of relay.

Answer explanation

The most likely cause of the door locks not operating after replacing the relay is that the wrong type of relay was installed. Using an incompatible relay can prevent the system from functioning correctly.

Front

The headlights get brighter as a vehicle is accelerated. Who is correct? Technician A: A high-capacity battery is causing this problem. Technician B: High charging system voltage could be the cause. Both A and B. Neither A or B.

Back

Technician B: High charging system voltage could be the cause.

Answer explanation

Technician B is correct because high charging system voltage can cause headlights to brighten as the engine accelerates, due to increased electrical output. Technician A's claim about the battery is not the primary cause.

Front

A dome light circuit keeps blowing fuses. Who is correct? Options: Technician B: Excessive resistance has increased current flow. Technician A: Check for a short to ground. Both A and B. Neither A or B.

Back

Technician A: Check for a short to ground.

Answer explanation

Technician A is correct; checking for a short to ground is essential when fuses blow. Technician B's claim about excessive resistance increasing current flow is misleading, as it does not directly address the fuse issue.

Front

A four-cylinder engine's #1 and #4 cylinders are misfiring. According to the schematic diagram, which of the following is causing these misfires?
- There is excessive resistance at point D of the system.
- There is an open at point A in the system.
- There is an open at point C in the system.
- There is an open at point B in the system.

Back

There is an open at point B in the system.

Answer explanation

The misfiring in cylinders #1 and #4 indicates a problem affecting both. An open at point B disrupts the ignition signal to these cylinders, causing them to misfire, making this the correct choice.

Front

The engine's cooling fan motor operates whenever the ignition is switched ON, even when the engine is cold. Which of the following would cause this continuous fan motor operation? Excessive resistance at point A of the system. An open at point D of the system. An open at point B in the system. A short to ground at point C in the system.

Back

A short to ground at point C in the system.

Answer explanation

A short to ground at point C causes the fan motor to receive continuous power, leading to its operation even when the engine is cold. This bypasses normal control signals that would turn the fan off.

Front

The electrical symbol above represents a:

Back

Connector

Answer explanation

The electrical symbol represents a connector, which is used to join two or more electrical circuits. Unlike a switch or circuit breaker, it does not control the flow of electricity but facilitates connections.

Front

If a technician reversed the leads of a digital voltmeter on a 12-volt circuit, the readout would show:

Back

-12.60 volts

Answer explanation

Reversing the leads of a digital voltmeter in a 12-volt circuit will display a negative voltage. Therefore, the readout will show -12.60 volts, indicating the polarity is reversed.

Front

All of the following are true about 12-volt maintenance-free battery replacement EXCEPT: Use a computer memory saver. Remove the negative terminal first. Replace the positive terminal last. Use a battery terminal puller if the terminal is stuck to the post.

Back

Replace the positive terminal last.

Answer explanation

The correct choice is 'Replace the positive terminal last.' This is false because the positive terminal should be connected first when installing a new battery and disconnected last when removing it to prevent short circuits.