BC automotive week 5-6

All of the following are variations of Ohms Law formula except:

V=A*R

V=A/R

R=V/A

A=V/R

V=A/R

Which of the following statements about a series circuit is true?

It has only one path for current flow.

It can have only one load connected at a time.

It offers several paths for current flow.

It will keep conducting even if interrupted.

It has only one path for current flow.

Which basic element of electricity is also described as “electrical pressure?”

Current

Capacitance.

Resistance.

Voltage.

Voltage

In a(n) ____, there are multiple paths for current to flow. .

parallel circuit

one-wire circuit

short circuit

series circuit

parallel circuit

Technician A says that an electrical short circuit causes excess current flow. Technician B says a short causes excess resistance to develop. Who is right?

A only

B only

Both A and B

Neither A nor B

A only

To protect an electrical circuit from damage by a “short,” a device called a(n) ____ is installed.

Diode

capacitor

fuse

relay

fuse

All of the following are types of electrical loads except:

electrolyte

motor

 solenoid

 bulb

electrolyte

All of the following are basic parts of the starting system, except:

solenoid.

inverter

ignition switch

starting motor

inverter

Which of the following uses a small current flow from the ignition switch to control a larger current flow to the starter?

reduction starter

starter solenoid or rely

clutch

shunt-wound motor

starter solenoid or rely

The starter pinion gear engages the ____ to “crank” the engine.

flywheel

harmonic balancer

cam gear

crankshaft pulley

flywheel

To prevent an engine from cranking while the vehicle is in gear, a(n) ____ is commonly used.

elector safety switch

lockout actuator

neutral safety switch

shift interlock unit

neutral safety switch

o be usable in an automotive electrical system, the AC output of the alternator must be ____ into DC.

 

biased

 relayed

 stratified

rectified

rectified

What would be the result if the circuit were shorted to ground at A?

blown fuse

only bulb 1 would light

no problem

the bulbs would be dim

blown fuse

What would be the result if the circuit were open at A?

blown fuse

only bulb 1 would light

none would light

the bulbs would be dim

none of the bulbs would light

What would be the result if the circuit were shorted to ground at B?

a blown fuse

only bulb 1 would light

no problem

the bulbs would be dim

only bulb 1 would light

What would result if the circuit were shorted to ground at B?

 only bulb 2 would light

blown fuse

 no problem

 bulb 1 would be dim

Blown Fuse

What would result if the circuit were open at B?

bulb 1 would not light

blown fuse

both bulbs would not light

bulb 2 would get brighter

bulb 1 would not light

What would result if the circuit were shorted to ground at C?

bulb 2 would not light

blown fuse

only bulb 1 would light

no change

no change

What would result if there was high resistance due to a bad connection at C?

bulb 2 would not light

blown fuse

bulb 2 would be dim

no change

bulb 2 would be dim

What would result if there was an open circuit at A?

both bulbs would not light

bulb 1 would not light

bulb 2 would not light

blown fuse

bulb 2 would not light

What would result if there was a short to ground at A?

blow fuse

bulb 1 would not light

bulb 2 would not light

no problem

blow fuse

Which of the following would cause intermittent light operation?

high voltage

open circuit

high resistance

loose connection

loose connection

Which of the following would cause dim lights?

high voltage

open circuit

high resistance

loose connection

high resistance

The “RC” or Reserve Capacity of a battery is a measure of how long a battery will deliver power if the _________ system fails.

starting

ignition

battery

charging

charging

A light yellow or bright clear dot on a maintenance free battery “plastic eye” hydrometer indicates:

the battery is dead and needs to be jump started

the battery as at least 65% state of charge

the battery is junk and needs to be replaced

 all of the above are correct

the battery is junk and needs to be replaced

When performing a “three step voltage test,” if the battery voltage is the same before and after the vehicle is started, this most likely would indicate:

the charging system is operating normally

the battery is defective

the starter is defective

the alternator is defective

the alternator is defective

A voltage drop of 2 volts on a wire conductor would indicate:

the wire is carrying a lot of voltage

the wire is defective

 no problem

 a short in the wire

the wire is defective

Two Technicians are discussing charging system tests for computer controlled vehicles. Technician A says it is OK to disconnect the battery cables while the engine is running to see if the charging system is working. Technician B says that test can generate voltage spikes that will damage electronic devices like computer modules. Who is right?

A only

B only

Both A and B

Neither A nor B

B only

While having a discussion. Technician A says the smaller in diameter the conductor is the less resistance it has. Technician B says the larger in diameter the conductor is the less resistance it has. Who is right?

A only

B only

Both A and B

Neither A nor B

B only

The drivability symptom that would prompt you to test the starting system is:

the engine will not crank over when the ignition switch is turned to the start position

the engine cranks over but will not start

the engine starts up but has a misfire after it is started

 none of the above are correct

the engine will not crank over when the ignition switch is turned to the start position

An ammeter is a device for directly measuring the resistance of a circuit.

true

false

false

When electrical current passes through a wire, a magnetic field is generated.

true

false

true

Electrolyte is a mixture of sulphonic acid and water.

true

false

true

Each battery cell produces approximately 2.1 volts.

true

false

true

Two 12-volt batteries connected in series will produce an output of 12 volts.

true

false

false

A CCA rating is the number of amps a fully charged battery can deliver at a warm temperature.

true

false

false

Most modern automobiles use 6-volt batteries.

true

false

false

On a Hybrid Vehicle the Motor-Generator is used to recharge the High Voltage (HV) battery.

true

false

true

Modern vehicles use an alternator, rather than a DC generator, to supply current.

true

false

true

A fully charged battery will produce a voltage reading of 12.25 volts.

true

false

false

Unit of resistance.

OHM

Multimeter.

VOM or DVOM

Unit of current flow.

amp

Unit of voltage

volt

Controls the alternator output voltage and current.

voltage regulator

Provides current to initially energize alternator; stabilizes alternator output.

battery

Light or meter that informs driver of charging system condition.

charge indicator

Device that uses engine power to produce electricity.

alternator

Linking device that drives alternator by conveying power from engine crankshaft.

alternator drive belt

While having a discussion. Technician A says the smaller in diameter the conductor is the less resistance it has. Technician B says the larger in diameter the conductor has the less resistance it has. Who is right?

A only

B only

Both A and B

Neither A nor B

B only

Unit of resistance.

ohm

Multimeter.

VOM

Unit of current flow.

amp

Integrated circuit.

chip

Unit of voltage.

volt

Each of the following is a basic part of the starting system, except:

inverter

solenoid

ignition switch

starting motor

inverter

Which of the following terms describes a starter solenoid?

rectified contactor

high current relay

Amplitude- modulated diode

Shunt-wound motor

high current relay

A voltage drop of 6 volts on a wire conductor would indicate:

 

the wire is carrying a lot of voltage

the wire is defective

 no problem

 a short in the wire

the wire is defective

The drivability symptom that would prompt you to test the starting system is:

The engine will not crank over when the ignition switch is turned to the start position

 the engine cranks over but will not start

 the engine starts up but has a misfire after it is started

 none of the above are correct

The engine will not crank over when the ignition switch is turned to the start position

Each battery cell produces approximately 2.1 volts.

true

false

true

Two 12-volt batteries connected in series will produce an output of 12 volts.

true

false

false

The starter relay allows a smaller current flow (from the ignition switch) to control a larger current flow (to the starter motor).

true

false

true

To be usable in an automotive electrical system, the AC output of the alternator must be ____ into DC.

biased

rectified

 stratified

 relayed

rectified

When performing a “three step voltage test,” if the battery voltage is the same before and after the vehicle is started, this most likely would indicate:

the alternator is defective

 the battery is defective

 the starter is defective

 the charging system is operating normally

the alternator is defective

Two Technicians are discussing charging system tests for computer controlled vehicles. Technician A says it is OK to disconnect the battery cables while the engine is running to see if the charging system is working. Technician B says that test can generate voltage spikes that will damage electronic devices like computer modules. Who is right?

A only

B only

Both A and B

Neither A nor B

B only

When electrical current passes through a wire, a magnetic field is generated.

true

false

true

All vehicles today use a DC generator , rather than an alternator, to supply current to the vehicle’s electrical system.

true

false

false

Controls the alternator output voltage and current.

voltage regulator

Provides current to initially energize alternator; stabilizes alternator output.

battery

Light or meter that informs driver of charging system condition.alter

change indicator

Device that uses engine power to produce electricity.

alternator

Linking device that drives alternator by conveying power from engine crankshaft.

alternator drive belt