Electrical Exam

Ohmmeter readings while testing a good diode should read:

continuity in both directions

infinity in both directions

infinity in one direction and a low resistance in the other

500 ohms in both directions

Correct! Wrong!

In the following illustration of a battery ground post and clamp, what would be an acceptable reading when the starter is operating?

more than .2 volts

less than .2 volts

12 volts

more than 12 volts

Correct! Wrong!

What is the advantage of putting a relay in a headlight circuit?

it protects the circuit

it reduces headlight failure

there is less current flow at the switch

there is more current flow at the switch

Correct! Wrong!

If resistance is doubled and the voltage remains the same:

current will remain the same

electromotive force will be cut in half

current flow will double

current flow will be cut in half

Correct! Wrong!

Each resistor in a series circuit will cause a ___________drop across itself:

wattage

voltage

amperage

resistance

Correct! Wrong!

Parallel circuits have _________ current to flow:

one path for

more than one path for

higher resistance for

larger wires for

Correct! Wrong!

The voltage drop across resistors in a basic parallel circuit will __________ the battery voltage.

be equal to

be one-half

reduce

increase

Correct! Wrong!

Replacing a conductor with a smaller diameter conductor could result in:

excessive heat build-up

improper circuit operation

excessive volt drop in the conductor

all of the above

Correct! Wrong!

Voltmeters are connected in _____________ with the voltage being measured.

series

parallel

series-parallel

all of the above

Correct! Wrong!

Ammeters are used to measure:

current

voltage

resistance

wattage

Correct! Wrong!

Ammeters are connected in ____________ with the circuit:

series

parallel

series-parallel

all of the above

Correct! Wrong!

Ohmmeters should be connected across a circuit carrying voltage:

True

False

Correct! Wrong!

An open circuit is one in which there is:

a short around the load

no complete path for current flow

a closed switch and a resistive load.

a path of least resistance for current flow

Correct! Wrong!

Elements that allow electrons to flow from atom are classified as:

conductors

insulators

semi-conductors

permanent

Correct! Wrong!

If electrons are forced to move in a conductor__________ flow occurs:

electron

amperage

voltage

conductor

Correct! Wrong!

The force needed to cause current to flow in a circuit is called ________.

gravity

voltage

amperage

conductance

Correct! Wrong!

Current flow can exist without voltage:

True

False

Correct! Wrong!

Voltage can exist without current:

True

False

Correct! Wrong!

When current flows through a resistance, heat is generated

True

False

Correct! Wrong!

Conventional theory for current flow is described as:

flow from negative to positive

flow from positive to negative

the flow of negative ions

the flow of positive ions

Correct! Wrong!

Diodes and transistors are made of semiconductor material:

True

False

Correct! Wrong!

What allows current flow in only one direction?

diodes

transistors

zener

transformers

Correct! Wrong!

What controls current by acting like a switch?

diodes

transistors

zener

resistors

Correct! Wrong!

Which electronic device has 3 electrical connections?

diodes

invertors

capacitors

transistors

Correct! Wrong!

An electromagnet''s strength may be increased by:

increasing the current through the coil

adding more loops to the coil

adding an iron core inside the coil

all of the above

Correct! Wrong!

Capacitors can be used to:

store electrical energy

protect switches

indicate a false ground

all of the above

Correct! Wrong!

One milliampere of current flow equals:

0.01 Amp

0.001 Amp

0.1 Amp

0.0001 Amp

Correct! Wrong!

The opposition to current flow is called:

heat

carbon

resistance

insulation

Correct! Wrong!

The measure of difference between charges is called:

potential

coulomb

resistance

amboid

Correct! Wrong!

A technician needs to check for voltage in an electrical circuit. Technician A says a 12-volt light is used by attaching one lead to a known good voltage source, then probing various points along a circuit. Technician B says one lead of the test light should be grounded, and the other used to probe various points along a circuit. Who is right?

Technician A

Technician B

Both Technician A and B

Neither Technician A nor B

Correct! Wrong!

To paraphase Ohm''s Law, it states that:

current increases as resistance increases

current decreases as voltage increases

current increases as resistance decreases

voltage increases as current increases

Correct! Wrong!

If excessive current flows through a fuse, the metal strip melts and:'

opens the circuit

closes the circuit

grounds the circuit

overloads the circuit

Correct! Wrong!

Flow in hydraulics is measured in gallons per minute, flow in an electrical circuit is measured in:

volts

amps

kilo-pascales (Kpa)

newtons

Correct! Wrong!

A conductor must cut across magnetic lines of force in order to induce a voltage.

True

False

Correct! Wrong!

The magnitude of induced voltage depends upon:

the strength of the magnetic field

the speed at which the lines of force cut across the conductor

the number of conductors that are cutting across the lines of force

all of the above

Correct! Wrong!

If a particular electrical circuit has 12 volts and 2 Ohms resistance, what is the watts being used?

6

24

18

72

Correct! Wrong!

If a technician is measuring mega-ohms, which type of meter would be the most accurate?

analog multimeter

digital multimeter

battery hydrometer

electrical megger

Correct! Wrong!

If a current carrying conductor were to come in contact with the frame of a vehicle, the result would be:

high resistance

low resistance

high voltage

low voltage

Correct! Wrong!

16 gauge wire is smaller than 12 gauge wire.

True

False

Correct! Wrong!

The color coded bands around a resistor indicate:

watts

current capacity

resistance

all of the above

Correct! Wrong!

In a step-up transformer:

voltage and current are increased

voltage and current are decreased

voltage in increased and current is decreased

current is increased and voltage is decreased

Correct! Wrong!

Technician A says an ohmmeter can be used instead of a self-powered test light in checking continuity. Technician B says when checking continuity, a voltmeter can be used instead of a self-powered test light or ohmmeter. Who is right?

Technician A

Technician B

both Technician A and B

Neither Technician A nor B

Correct! Wrong!

On vehicle with a 12-volt system, a switch circuit feeds a pair of 50-watt auxiliary lights. What size of fuse would be required to protect the circuit and provide a 15% cushion for surges?

5 amp fuse

10 amp fuse

15 amp fuse

15 amp circuit breaker

Correct! Wrong!

A truck has experienced a charging problem. A careful technician has found loose mounting bolts and tightened them. The truck now performs well. Technician A says the problem might have been a slipping belt. Technician B says the problem might have been poor grounding of the alternator. Who is right?

Technician A

Technician B

both Technician A and B

neither Technician A nor B

Correct! Wrong!

Which of the following is not used when checking a circuit for continuity?

An ohmmeter

An ammeter

A voltmeter

A test lamp

Correct! Wrong!

When using a voltmeter to perform a voltage drop test in a circuit, the leads should be connected in what way?

to the battery terminals

from the positive battery terminal to ground

in series with the circuit being tested

in parallel with the circuit being tested

Correct! Wrong!

Technician A says an ammeter is used to test continually. Technician B says an ammeter indicates the amount of current flowing in a given circuit. Who is right?

A only

B only

Both A and B

Neither A nor B

Correct! Wrong!

The blower motor in a truck is running very slowly. An ammeter shows a low current flow. This could be caused by:

high resistance in the circuit

low resistance in the circuit

an overcharged battery

shorted blower motor

Correct! Wrong!

single clearance light in a circuit glows dimly. A technician connects a test light to the bulb socket terminal and the test light burns at normal brightness. What is likely to be the problem?

a bad ground to frame at the light could be the cause

high resistance in the circuit from the battery to the light could be the cause

the test light uses less amperage and therefore glow brighter

the wiring from the light switch was sized too small and is creating high resistance

Correct! Wrong!

A non-computerized vehicle''s oil pressure warning light fails to come on, even when the engine is shut down. All of the following are possible causes of the problem EXCEPT a:

defective sending unit

grounded wire from the light to the sending unit

high-resistance connection between the sending unit and the wiring coming from the warning lamp

burnt-out warning lamp bulb

Correct! Wrong!

Ohmmeter readings while testing a good diode should read:

In the following illustration of a battery ground post and clamp, what would be an acceptable reading when the starter is operating?

What is the advantage of putting a relay in a headlight circuit?

If resistance is doubled and the voltage remains the same:

Each resistor in a series circuit will cause a ___________drop across itself:

Parallel circuits have _________ current to flow:

The voltage drop across resistors in a basic parallel circuit will __________ the battery voltage.

Replacing a conductor with a smaller diameter conductor could result in:

Voltmeters are connected in _____________ with the voltage being measured.

Ammeters are used to measure:

Ammeters are connected in ____________ with the circuit:

Ohmmeters should be connected across a circuit carrying voltage:

An open circuit is one in which there is:

Elements that allow electrons to flow from atom are classified as:

If electrons are forced to move in a conductor__________ flow occurs:

The force needed to cause current to flow in a circuit is called ________.

Current flow can exist without voltage:

Voltage can exist without current:

When current flows through a resistance, heat is generated

Conventional theory for current flow is described as:

Diodes and transistors are made of semiconductor material:

What allows current flow in only one direction?

What controls current by acting like a switch?

Which electronic device has 3 electrical connections?

An electromagnet''s strength may be increased by:

Capacitors can be used to:

One milliampere of current flow equals:

The opposition to current flow is called:

The measure of difference between charges is called:

To paraphase Ohm''s Law, it states that:

If excessive current flows through a fuse, the metal strip melts and:'

Flow in hydraulics is measured in gallons per minute, flow in an electrical circuit is measured in:

A conductor must cut across magnetic lines of force in order to induce a voltage.

The magnitude of induced voltage depends upon:

If a particular electrical circuit has 12 volts and 2 Ohms resistance, what is the watts being used?

If a technician is measuring mega-ohms, which type of meter would be the most accurate?

If a current carrying conductor were to come in contact with the frame of a vehicle, the result would be:

16 gauge wire is smaller than 12 gauge wire.

The color coded bands around a resistor indicate:

In a step-up transformer:

Technician A says an ohmmeter can be used instead of a self-powered test light in checking continuity. Technician B says when checking continuity, a voltmeter can be used instead of a self-powered test light or ohmmeter. Who is right?

On vehicle with a 12-volt system, a switch circuit feeds a pair of 50-watt auxiliary lights. What size of fuse would be required to protect the circuit and provide a 15% cushion for surges?

Which of the following is not used when checking a circuit for continuity?

When using a voltmeter to perform a voltage drop test in a circuit, the leads should be connected in what way?

Technician A says an ammeter is used to test continually. Technician B says an ammeter indicates the amount of current flowing in a given circuit. Who is right?

The blower motor in a truck is running very slowly. An ammeter shows a low current flow. This could be caused by:

single clearance light in a circuit glows dimly. A technician connects a test light to the bulb socket terminal and the test light burns at normal brightness. What is likely to be the problem?

A non-computerized vehicle''s oil pressure warning light fails to come on, even when the engine is shut down. All of the following are possible causes of the problem EXCEPT a:

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Heavy-Duty Mechanic - Trucks & Equipment