A/C Motors

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Question 1

An AC motor is used to?

A	Create electrical energy
B	Convert electrical energy to mechanical energy
C	Convert mechanical energy to electrical energy
D	Create mechanical energy

Question 2

What is the maximum voltage that can be used on a 120 volt motor?

A	108 volts
B	120 volts
C	132 volts
D	135 volts

Question 3

What is the minimum voltage that can be used on a 120 volt motor?

A	100 volts
B	108 volts
C	123 volts
D	135 volts

Question 4

The shaft of a motor is connected is connected to the

A	Stator
B	Shell
C	Drum
D	Rotor

Question 5

Increasing the poles of a motor?

A	Increases the speed of the motor
B	Decrease the speed of the motor
C	Has no effect on the speed of the motor
D	Changes the frequency of the motor

Question 6

The poles of a motor are also known as the?

A	Stator
B	Rotor
C	Iron core
D	Armature

Question 7

A 240 volt, 60 Hz motor with four poles will operate at?

A	3,600 rpm
B	1,800 rpm
C	1,200 rpm
D	1,050 rpm

Question 8

A 240 volt, 60 Hz motor with six poles will operate at?

A	3,600 rpm
B	1,800 rpm
C	1,200 rpm
D	1,050 rpm

Question 9

The definition of horsepower is

A	The amount of power to raise 550 lb in 1 second
B	The amount of power to raise 550 lb in 1 minute
C	The amount of power to raise 746 lb in 1 second
D	The amount of power to raise 746 lb in 1 minute

Question 10

One horsepower is equal to

A	550 watts
B	550 kilowatts
C	746 watts
D	746 kilowatts

Question 11

On a single phase motor, where would the highest resistance be found?

A	Run to common
B	Start to common
C	Run to start
D	T1 to T2

Question 12

On a single phase motor, where would the lowest resistance be found?

A	Run to common
B	Start to common
C	Run to start
D	T1 to T2

Question 13

When is the start winding removed from the electrical circuit?

A	When the motor reaches 100% of it’s running speed
B	When the motor reaches 90% of it’s running speed
C	When the motor reaches 75% of it’s running speed
D	When the motor reaches 50% of it’s running speed

Question 14

In a single phase motor the start winding is

A	45 degrees out of phase with the run winding
B	90 degrees out of phase with the run winding
C	120 degrees out of phase with the run winding
D	In phase with the run winding

Question 15

In a single phase motor the start and run winding are wired

A	In parallel with each other
B	In series with each other
C	In series parallel with each other
D	In a delta configuration

Question 16

When testing the windings of a single phase motor with an ohmmeter the meter should always be set on

A	R X 1
B	R X 100
C	R X 1,000
D	R X 10,000

Question 17

When checking the resistance of a single phase motor, a reading is obtained with an ohmmeter, T1 to T2 is 3 ohms, from T2 to T3 is 5 ohms, and from T1 to T3 is 8 ohms which terminal is run, start, and common?

A	T1 is common, T2 is run, T3 is start
B	T1 is start, T2 is common, T3 is run
C	T1 is run, T2 is start, T3 is common
D	T1 is run, T2 is common, and T3 is start

Question 18

When measuring an open run winding, the ohmmeter will read

A	Infinite ohms from start to common
B	Zero ohms from run to common
C	Infinite ohms from run to common
D	Zero ohms from start to common

Question 19

When measuring resistance on a compressor motor that has a grounded condition, the ohmmeter will read

A	Infinite resistance from ground to T1 and T2 on the contactor
B	A measurable resistance from ground to the bare copper wire at the power supply
C	Infinite resistance from ground to the compressor terminals
D	A measurable resistance from ground to the compressor terminals

Question 20

When measuring a shorted start winding, the ohmmeter will read

A	Infinite ohms from start to common
B	Lower resistance from run to common than from start to common
C	Infinite ohms from run to common
D	Lower resistance from start to common than from run to common

Question 21

When troubleshooting a single phase motor that has a shorted run winding, it is most likely that

A	The motor will hum and not start
B	There will be voltage to the motor and the motor will not start
C	The motor will cycle on the external overload
D	There will be no voltage to the motor

Question 22

The contacts of a start relay are

A	Wired in series with the run winding
B	Wired in series with the start winding
C	Always normally opened
D	Never normally opened

Question 23

Why are start relays always external to a hermetically sealed compressor?

A	Start relays are not always external to a hermetically sealed compressor
B	Arcing could cause an explosion in the compressor
C	Arcing from the relay could cause acids to form in the compressor
D	Current will not flow in a sealed system

Question 24

In what position are the contacts of a centrifugal switch when in use as a start relay?

A	Closed until the motor starts, then they open
B	Opened until the motor starts, then they close
C	Closed and they remain closed until the motor stops
D	Opened and they close after the motor has reached 75% of it’s running speed

Question 25

A current relay operates off the?

A	Back voltage from the run winding
B	Back voltage from the start winding
C	Amperage from the run winding
D	Amperage from the start winding

Question 26

A current relay has a set of

A	Normally closed contacts in series with the start winding
B	Normally open contacts in parallel with the start winding
C	Normally closed contacts in parallel with the start winding
D	Normally open contacts in series with the start winding

Question 27

A potential relay has a set of

A	Normally closed contacts in series with the start winding
B	Normally open contacts in parallel with the start winding
C	Normally closed contacts in parallel with the start winding
D	Normally open contacts in series with the start winding

Question 28

A potential relay operates off the

A	Back voltage from the run winding
B	Back voltage from the start winding
C	Amperage from the run winding
D	Amperage from the start winding

Question 29

What terminals connect to the contacts on a potential relay?

A	Terminals 1 and 2
B	Terminals 1 and 5
C	Terminals 2 and 5
D	Terminals 4 and 5

Question 30

What terminals connect to the coil on a potential relay?

A	Terminals 1 and 2
B	Terminals 1 and 5
C	Terminals 2 and 5
D	Terminals 4 and 5

Question 31

What is connected to terminal 1 on a potential relay?

A	The start winding
B	The run capacitor
C	The start capacitor
D	The common terminal

Question 32

What is connected to terminal 2 on a potential relay?

A	The start winding
B	The run capacitor
C	The start capacitor
D	The common terminal

Question 33

What is connected to terminal 5 on a potential?

A	The start winding
B	The run capacitor
C	The start capacitor
D	The common terminal

Question 34

A solid state relay uses

A	PTC thermistor in parallel with the start winding
B	PTC thermistor in series with the start winding
C	NTC thermistor in parallel with the start winding
D	NTC thermistor in series with the start winding

Question 35

What does FLA mean?

A	Frequency loaded amperage
B	Frequency locked amperage
C	Fully locked amperage
D	Full load amperage

Question 36

What does LRA mean?

A	Loaded rotor amperage
B	Locked rotor amperage
C	Loaded running amperage
D	Lagged running amperage

Question 37

On a single phase compressor, external overload protectors are commonly located

A	On the run terminal
B	On the start terminal
C	On the common terminal
D	Across the run and common terminals

Question 38

The type of overload protector that is located in the windings of a motor and will break the circuit to the contactor coil is a

A	Line break external overload
B	Pilot duty external overload
C	Line break internal overload
D	Pilot duty internal overload

Question 39

Overload protectors are designed to sense?

A	Heat only
B	Current and voltage
C	Heat and current
D	Heat and voltage

Question 40

The type of overload protector that is located in the winding of a motor and will break the circuit directly to the compressor is a

A	Line break external overload
B	Pilot duty external overload
C	Line break internal overload
D	Pilot duty internal overload

Question 41

The type of overload protector that is located outside of a motor and will break the circuit directly to the contactor coil is a

A	Line break external overload
B	Pilot duty external overload
C	Line break internal overload
D	Pilot duty internal overload

Question 42

When testing a compressor motor with an ohmmeter, what reading would be obtained if its internal overload protector is in the open position?

A	Run to start – zero ohms
B	Run to common – zero ohms
C	Run to start – infinite ohms
D	Run to common – infinite ohms

Question 43

Capacitors are commonly rated in

A	Microfarads
B	Microamps
C	Milliamps
D	Microhertz

Question 44

The VAC of a capacitor

A	Can be over by 20% of its rating
B	Should never be over its rating
C	Is additive when wired in parallel
D	Is additive when wired in series

Question 45

What is the purpose of the 20,000 ohm, 2 watt resistor located on a start capacitor?

A	To discharge the capacitor during motor operation
B	To increase the microfarad rating by 20%
C	To level off the sine wave for a much smoother start
D	To discharge the capacitor after motor operation

Question 46

The capacitor analyzer is used to measure

A	Shorted or open capacitors and microfarad ratings
B	Microfarad ratings, and the capacitor’s power factor
C	Open capacitors, microfarad ratings, and the capacitor’s power factor
D	Open and shorted capacitors, microfarad ratings, and the capacitor’s power factor

Question 47

What type of relay would remove the start capacitor from the circuit?

A	switching relay
B	timed delay relay
C	Potential relay
D	Contactor

Question 48

Which capacitor uses an oil to dissipate heat?

A	Run capacitor
B	Start capacitor
C	Paper type capacitor
D	Flux capacitor

Question 49

Which capacitor is taken out of the circuit once the motor is running?

A	Start capacitor
B	Run capacitor
C	Dual capacitor
D	Run and start capacitor

Question 50

A run capacitor is in the circuit

A	Until the motor reaches 75% of its operating speed
B	For 2 seconds
C	For the full cycle of the motor
D	Until the capacitor is discharged

Question 51

When wiring two 30ufd run capacitors in parallel, what is the microfarad rating on the complete circuit?

A	60ufd
B	15ufd
C	90ufd
D	25ufd

Question 52

When wiring two 30 ufd run capacitors in series, what is the microfarad rating on the complete circuit?

A	60ufd
B	15ufd
C	90ufd
D	25ufd

Question 53

When testing a good capacitor with an analog ohmmeter, what reading should be obtained?

A	The needle should move toward zero and stay there
B	The needle should stay on infinite resistance
C	The needle should move toward zero and fall back toward infinite resistance
D	The needle should move toward zero and fall back to a readable resistance and stay

Question 54

When testing a shorted capacitor with an analog ohmmeter, what reading should be obtained.

A	The needle should move toward zero and stay there
B	The needle should stay on infinite resistance
C	The needle should move toward zero and fall back toward infinite resistance
D	The needle should move toward zero and fall back to a readable resistance and stay

Question 55

When testing an open capacitor with an analog ohmmeter, what reading should be obtained?

A	The needle should move toward zero and stay there
B	The needle should stay on infinite
C	The needle should move toward zero and fall back toward infinite resistance
D	The needle should move toward zero and fall back to a readable resistance and stay

Question 56

Which motor uses no start or run capacitor, but needs a switch to remove the start windings after startup?

A	Split phase
B	CS motor
C	CSR motor
D	PSC motor

Question 57

Which motor uses a run capacitor, but has no start for operation?

A	Split phase
B	CS motor
C	CSR motor
D	PSC motor

Question 58

Which motor uses a start capacitor, but has no run capacitor for operation?

A	Split phase
B	CS motor
C	CSR motor
D	PSC motor

Question 59

Which motor uses a run capacitor and a start capacitor for operation?

A	Split phase
B	CS motor
C	CSR motor
D	PSC motor

Question 60

If a single phase electric motor is using a 4.5 amps in a 220v circuit with a power factor of 0.91, it is using power at a rate of

A	5 watts
B	94.5 watts
C	942 watts
D	1037 watts

Question 61

A three phase motor is commonly used when the system requires?

A	A motor to have a current draw higher than 15 amps
B	A motor higher than 5 horsepower
C	A motor with the voltage higher than 240 volts
D	A motor with a frequency higher than 50Hz

Question 62

How is the direction of a three phase motor reversed?

A	By reversing any two hot legs
B	By removing and repositioning the rotor
C	By reversing the grounding tap and one hot leg
D	A three phase motor cannot be reversed

Question 63

What is commonly used to start a three phase motor?

A	a potential relay and a start capacitor
B	a current relay and a start capacitor
C	a potential relay
D	a contactor or a starter

Question 64

How many degrees out of phase with each other are the windings of a three phase motor?

A	45 degrees
B	90 degrees
C	120 degrees
D	The windings are in phase with each other

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A/C Motors

A/C Motors

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