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Motors Final Fall

Total questions: 100

Worksheet time: 2hrs 20mins

Name
Class
Date
1.
A motor's speed is determined by ____.
a)
number of motor poles
b)
amperage
c)
voltage
d)
size
2.
Start windings are placed ____ with the run windings.
a)
slightly out of phase
b)
180 degrees out of phase
c)
in phase
d)
in series
3.
The start windings have ____.
a)
more turns than the run windings
b)
fewer turns than the run windings
c)
the same number of turns as the run windings
d)
larger diameter wire than the run windings
4.
A split-phase has a ____ winding and a ____ winding.
a)
start, run
b)
start, common
c)
common, run
d)
run, common
5.
When a general duty split-phase motor reaches approximately 75% of its operating speed, the start winding is de-energized by a ____.
a)
centrifugal switch
b)
circuit board
c)
capacitor
d)
dual voltage switch
6.
A split-phase motor that has a current relay and a start capacitor is called a(n) ____ motor.
a)
Capacitor Start, Induction Run (CSIR)
b)
Capacitor Start, Capacitor Run (CSCR)
c)
Induction Start, Induction Run (ISIR)
d)
Permanent Split Capacitor (PSC)
7.
When a Capacitor Start Induction Run (CSIR) motor is running and up to speed, what is the total capacitance acting on the motor? (Assume the run capacitor is 5 microfarads and the start capacitor is 20 microfarads, if present.)
a)
5 microfarads
b)
4 microfarads
c)
20 microfarads
d)
25 microfarads
8.
A permanent split capacitor (PSC) motor that is running and up to speed will have the start winding ____.
a)
energized
b)
de-energized
c)
in series with the run winding
d)
removed from the circuit
9.
When a Capacitor Start, Capacitor Run (CSCR) motor initially starts, what is the total capacitance acting on the motor? (Assume the run capacitor is 5 microfarads and the start capacitor is 20 microfarads, if present.)
a)
25 microfarads
b)
20 microfarads
c)
5 microfarads
d)
15 microfarads
10.
Capacitors wired in series with the starting winding provide a(n) ____.
a)
greater starting torque
b)
longer starting time
c)
aid in starting three phase motors
d)
more efficient operation at full load speed
11.
The shaded pole motor ____.
a)
has little starting torque
b)
has excessive starting torque
c)
has greater efficiency than most split-phase motors
d)
will start against a heavy starting load
12.
Three phase motors have ____.
a)
run windings only
b)
three start and three run windings for each phase
c)
one start and one run winding for each phase
d)
a start switch in each phase circuit
13.
A current magnetic relay opens and closes its contacts based on the ____.
a)
current in the run winding
b)
voltage across the run winding
c)
voltage across the start winding
d)
current in the start winding
14.
The starting device usually used on single phase, fractional horsepower motors requiring low starting torque is the ____.
a)
current relay
b)
potential relay
c)
centrifugal switch
d)
differential relay
15.
The positive temperature coefficient resistor start device is a type of ____.
a)
variable resistor
b)
capacitor
c)
switching device
d)
diode
16.
A permanent split-capacitor motor has a ____.
a)
run capacitor only
b)
start and run capacitor
c)
start capacitor only
d)
split phase capacitor
17.
The heavier the load on an operating motor, the greater the amount of slip.
a)
True
b)
Fasle
18.
The centrifugal switch mounted on the shaft of a split-phase motor has a normally closed contact.
a)
True
b)
Fasle
19.
The contact(s) in a potential type starting relay are normally closed.
a)
True
b)
Fasle
20.
Once the start winding and the start capacitor have been removed for the circuit, the motor will continue to operate with only the run winding energized.
a)
True
b)
Fasle
21.
The microfarad rating of the run capacitor is much lower than that of the start capacitor for any given motor application.
a)
True
b)
Fasle
22.
The contact(s) in a current type starting relay are normally closed.
a)
False
b)
True
23.
The resistances of the windings in a three phase motor are all equal.
a)
True
b)
False
24.

A CSCR type motor has a start capacitor that stays in the circuit when the motor is running.

a)

True

b)

False

25.
The rotating portion of an electric motor is called the ____________________.
a)
Rotor
b)
Cage
c)
Phase
d)
Capacitor
26.
The difference between synchronous speed and full load speed is called ____________________.
a)
Slip
b)
Difference
c)
Half speed
d)
loaded
27.
The coil of a potential relay has ____________________ resistance.
a)
High
b)
Low
c)
Mild
d)
No
28.
On a potential relay, the coil is connected between terminals 2 and ____________________.
a)
5
b)
1
c)
3
d)
4
29.
What is meant by the "phase angle" in an alternating current circuit?
a)
Phase angle refers to the amount by which the current leads or lags the voltage.
b)
Phase angle refers to the amount by which the voltage leads or lags the voltage.
c)
Phase angle refers to the amount by which the watts leads or lags the voltage.
d)
Phase angle refers to the amount by which the microfarads leads or lags the voltage.
30.
When not air cooled, the heat generated by the motor in a hermetic motor-compressor assembly is removed by what?
a)
Refrigerant Vapor
b)
Refrigerant liquid
c)
Water
d)
Water-Vapor
31.

Electric motors are used to turn the prime movers of air, water, and ________.

a)

Refrigerant

b)

oil

c)

smoke

d)

solids

32.

Shaded pole motors have a high level of torque compared to single phase motors.

a)

True

b)

False

33.

Electric motors are used to turn the prime movers of air, water, and ________.

a)

Refrigerant

b)

oil

c)

smoke

d)

solids

34.

Electric motors have a stator with windings, a _____, bearings, end bells, housing, and some means to hold these parts in the proper position.

a)

rotor

b)

sleave

c)

gasket

d)

wires

35.

The motor _____ is connected to the rotor; therefore, when the rotor turns, so does the motor _____.

a)

shaft

b)

rod

c)

bearing

d)

shank

36.

The technician must understand which motor is suitable for each job in order to troubleshoot effectively and, if necessary, to replace a motor with the proper type.

a)

true

b)

false

37.

115-V single-phase for common appliances

a)

True

b)

False

38.

A motor that runs a refrigeration compressor must have a high starting _____.

a)
torque
b)

amperage

c)

voltage

d)

horsepower

39.

a ___________ an alternating current motor where the rotor turns from induced magnetism from the field windings.

a)

Induction motor

b)

reduction motor

c)

capacitive motor

d)

impedance motor

40.

Excessive motor slip can be an indication of proper motor lubrication, effective motor bearings, greatly adjusted belts , or properly selected motor for the desired application.

a)

False

b)

True

41.

_______ is the component in a motor that contains the windings: it does not turn.

a)

rotor

b)

windings

c)

stator

d)

coil

42.

115-V single-phase for common appliances

a)

True

b)

False

43.

A centrifugal switch allows the run windings to be taken out of the circuit once the motor has reached 75% of it's running capacity.

a)

True

b)

False

44.

The rotating portion of the motor is call the _____.

a)
rotor
b)

stator

c)

winding

d)

BEMF inducer

45.

Capacitors ensure that a single phase motor rotates in a certain direction every time.

a)

True

b)

False

46.

Current relays are used on single phase, fractional horsepower motors requiring ______ starting torque.

a)

Low

b)

No

c)

High

d)

Induced

47.

When temperature increases, the resistance of a PTCR increases.

a)

True

b)

False

48.

To determine LRA, the device must be off and locked relay removed.

a)

True

b)

False

49.

Placing leads on "C" and "HERM" will allow the technician to measure ___ microfarads.

a)

None

b)

Comprssor

c)

Fan

d)

Current relay

50.

Three phase motors require the used of a capacitor with a very large microfarad rating to start.

a)

True

b)

False

51.

The ___ is the current the motor draws while operating at a full-load condition at the rated voltage.

a)

RLA

b)

LRA

c)

FLA

d)

NRA

52.
If the voltage supplied to the motor is well below the motor rated voltage, the current draw will be ____ it should be.
a)
higher than
b)
lower than
c)
the same as
d)
in reverse polarity than
53.
The voltage tolerance of a standard electric motor is ____.
a)
+10% -10%
b)
+5% -10%
c)
+10% -5%
d)
+15% -15%
54.
The locked-rotor amperage is normally ____ times as great as the run-load amperage.
a)
5
b)
2
c)
3
d)
10
55.

An open motor with a centrifugal starting switch should be used in a room containing explosive gas.

a)

True

b)

False

56.
When referring to motors, to what does the "insulation class" relate?
a)
the normal operating temperature of the motor
b)
the noise level of the motor
c)
the type of base on which the motor is mounted
d)
None of the above
57.

Large motors use a type of ball bearing called a roller bearing.

a)

True

b)

False

58.

Some motors have grease fittings to make lubricating easier.

a)

True

b)

False

59.

_______ mounts are bolted directly to the frame, fan, or pump.

a)

Resilient

b)

Rigid

c)

Viscous

d)

Loose

60.
Grounding straps are required on resilient mounted motors to ____.
a)
ground the motor in case of winding failure
b)
prevent rotation of the motor in the mount
c)
help reduce motor vibration transfer to the object on which the motor is mounted
d)
act as the position for locating the motor leads
61.

The _____ mount is often seen in indoor unit blower motors.

a)

Cradle

b)

Rigid-base

c)

Belly-band

d)

End

62.

Mount standard dimensions are established by _____.

a)

AFUE

b)

ASHRAE

c)

NEMA

d)

EPA

63.
A motor can burn out if the supply voltage is either too high or too low.
a)
True
b)
False
64.
One method a technician can employ to check a motor is to take amperage readings of a motor (both on start-up and after start-up) and compare them to the motor's nameplate.
a)
True
b)
False
65.

The type of motors is a ____ mount type.

a)

End

b)

Flange

c)

Flexible

d)

Hanging

66.

RLA is used to determine the motor's speed a start up.

a)

True

b)

False

67.

Full-load amps have not been used by compressor manufacturers since 1972.

a)

True

b)

False

68.
There is a definite relationship between the speed of the motor and the speed of the blower.
a)
True
b)
False
69.
The alternating current frequency supplied by the power companies in the United States is ____________________ hertz.
a)
60
b)
80
c)
50
d)
120
70.

If the applied voltage is too high, the motor may develop local hot spots within its windings.

a)

True

b)

False

71.
The vertical condenser fan is trying to fly downward into the unit to push air out the top, which puts a real load on the end of the bearing, called the ____________________ surface.
a)
Thrust
b)
Rust
c)
Ground
d)
Drive
72.
In order to be electrically safe, a motor that is set in a "resilient" mount, must have a(n) ____________________.
a)
Ground strap
b)
Electrical strap
c)
Voltage strap
d)
Drive strap
73.
Whenever possible, when changing a motor, the _________________________ should be obtained.
a)
Exact replacement
b)
Does not matter
c)
Similar replacement
d)
Drive replacement
74.

Amp draws vary and can be dependent on surrounding ambient temperature.

a)

True

b)

False

75.
Explain the locked-rotor amperage (LRA).
a)
The LRA is the amperage the motor draws at start-up before the rotor has started to turn.
b)
The LRA is the amperage the motor draws at cool-down before the rotor has started to turn.
c)

The LRA is the voltage the motor draws at start-up after the rotor has started to turn.

d)
The LRA is the amperage the motor draws at cool-down after the rotor has started to turn.
76.
T/F: By taking amperage readings at start-up and while the motor is operating under load and comparing these readings with those on the motor nameplate, the technician can determine whether the motor is operating within its design parameters.
a)
True
b)
False
77.

The frequency of the electrical current that the power company supplies is often stated in ___.

a)

FPS

b)

PCM

c)

CPS

d)

CPA

78.
T/F: A motor that is "rigid-mounted" is connected directly to the frame of the equipment and will transmit noise and vibration. A "resilient" mount has a rubber ring that prevents the noise and vibration from transmitting.
a)
True
b)
False
79.
Name four basic methods for mounting motors.
a)
Cradle mount, rigid-base mount, end mount, and belly-band strap mount
b)
Cradle mount, rigid-base mount, front-end mount, and belly-band strap mount
c)
Cradle mount, soft-base mount, end mount, and belly-band strap mount
d)
Cradle mount, rigid-base mount, end mount, and belly-band front mount
80.

This 3-phase motor will operate connected to this single phase power supply.

a)

TRUE

b)

False

81.

Are L1 and L2 normally open or normally closed?

a)

N.O.

b)

N.C.

82.

As the load or torque on a motor increases, the amperage draw required to power the motor will _______.

a)

Increase

b)

Stay the same

c)

Decrease

d)

Open the contacts

83.
An inherent motor protector is a ____.
a)
thermally activated device in the motor winding
b)
circuit breaker
c)
motor starter overload
d)
line fuse
84.

The is RLA the current drawn by the motor just as it begins to start but before the rotor begins to rotate.

a)

True

b)

False

85.
Standards for motor overload protection are set by the ____.
a)
National Electrical Code
b)
United States Department of Transportation
c)
Environmental Protection Agency
d)
American National Standards Institute
86.

It is considered a throwaway device because parts are not available for rebuilding it when it no longer functions properly.

a)

True

b)

False

87.

What type of windings does this motor have?

a)

Delta

b)

CSR

c)

Star

d)

Shaded pole

88.

The coil of the contactor will be connected to ____ volts.

a)

240

b)

24

c)

115

d)

460

89.

A set of contacts are closed when the relay is ENERGIZED. These contacts are classified as normally closed.

a)

True

b)

False

90.

The motor starter differs from a contactor because it has motor overload protection built into its framework.

a)
True
b)
False
91.
Contactor contacts that are badly pitted can cause the motor to burn out.
a)
True
b)
False
92.

Filing or sanding is an acceptable practice to repair a contactor.

a)

True

b)

False

93.

Fuses are used as circuit (not motor) protectors.

a)
True
b)
False
94.

Motors can operate without harm for short periods under a slight overcurrent condition.

a)
True
b)
False
95.
The sun shining on a distribution panel has no effect on the breakers in the panel.
a)

True

b)

False

96.

The LRA of a motor is typically ____ times higher than the FLA of the motor and can be as high as seven times the FLA.

a)

5

b)
10
c)

8

d)
17
97.
The best way to repair a defective relay is by ____________________.
a)
Replacemnet
b)
Fixing
c)
Measuring
d)
Conducting
98.
The most common material used on the surface of contacts is ____________________.
a)
Silver
b)
Gold
c)
Brass
d)
Aluminum
99.

Full-load amps (FLA) have not been used by compressor manufacturers since ____, when UL changed the rating to rated-load amps (RLA).

a)

1972

b)

2003

c)

1920

d)

2020

100.

This is a ___ pole contactor.

a)

Dual

b)

Single

c)

Triple

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