Question 1

The motor that should be used in a potentially wet area is a(n) ____ motor.

Accepted Answer

A)  enclosed 
B)  drip proof 
C)  explosion proof 
D)  open 
A)  enclosed 
B)  drip proof 
C)  explosion proof 
D)  open B

Question 2

Explain the difference between a "rigid" mount and a "resilient" rubber motor mount.

Accepted Answer

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.

Question 3

If the applied voltage is too high, the motor may develop local hot spots within its windings, but it will not always experience  ____________________.

Accepted Answer

high amperage

Question 4

The alignment of a motor and the driven mechanism must be done at room temperature and ____.

Accepted Answer

A)  after heating with a torch 
B)  at operating temperature 
C)  after running for one minute 
D)  again after several days of operation 
A)  after heating with a torch 
B)  at operating temperature 
C)  after running for one minute 
D)  again after several days of operation

Question 5

A belt-driven blower assembly that has a resilient mounting requires a grounding strap. Why?

Accepted Answer

It provides a path t

Question 6

What is the major advantage of a ball bearing motor over the sleeve bearing motor?

Accepted Answer

It will ha

Question 7

Why are explosion-proof motors not normally used on standard equipment?

Accepted Answer

A)  They are too large. 
B)  They are too noisy. 
C)  They are too expensive. 
D)  They cannot be replaced. 
A)  They are too large. 
B)  They are too noisy. 
C)  They are too expensive. 
D)  They cannot be replaced.

Question 8

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.

Accepted Answer

The answer of The vertical condenser fan is trying to...

Question 9

When servicing and lubricating a motor, why must a technician use the proper oil?

Accepted Answer

If the oil is too thin, it will drip rea

Question 10

The width of a drive belt is classified as ____.

Accepted Answer

A)  large or small 
B)  narrow or wide 
C)  A or B 
D)  1 or 2 
A)  large or small 
B)  narrow or wide 
C)  A or B 
D)  1 or 2

Question 11

Name four basic methods for mounting motors.

Accepted Answer

The methods include

Question 12

A sleeve bearing would typically be used in a motor that operates with a ____.

Accepted Answer

A)  light load and where noise is a factor 
B)  heavy load and where noise is a factor 
C)  heavy load in a dirty atmosphere 
D)  heavy load in a moist atmosphere 
A)  light load and where noise is a factor 
B)  heavy load and where noise is a factor 
C)  heavy load in a dirty atmosphere 
D)  heavy load in a moist atmosphere

Question 13

The device that transfers the motor's energy to the driven component is called the _________________________.

Accepted Answer

The answer of The device that transfers the motor's energy...

Question 14

A direct-drive motor is usually connected to a load with a ____.

Accepted Answer

A)  cradle mount 
B)  rigid base mount 
C)  pulley 
D)  coupling 
A)  cradle mount 
B)  rigid base mount 
C)  pulley 
D)  coupling

Question 15

Explain how a technician can verify that a motor is operating within nameplate parameters.

Accepted Answer

By taking amperage readings at start-up

Question 16

If the voltage supplied to the motor is well below the motor rated voltage, the current draw will be ____ it should be.

Accepted Answer

A)  lower than 
B)  the same as 
C)  higher than 
D)  in reverse polarity than 
A)  lower than 
B)  the same as 
C)  higher than 
D)  in reverse polarity than

Question 17

The alternating current frequency supplied by the power companies in the United States is ____________________ hertz.

Accepted Answer

The answer of The alternating current frequency supplied by the...

Question 18

The voltage tolerance of a standard electric motor is ____.

Accepted Answer

A)  +5% -10% 
B)  +10% -5% 
C)  +10% -10% 
D)  +15% -15% 
A)  +5% -10% 
B)  +10% -5% 
C)  +10% -10% 
D)  +15% -15%

Question 19

Whenever possible, when changing a motor, the _________________________ should be obtained.

Accepted Answer

The answer of Whenever possible, when changing a motor, the...

Question 20

A drip-proof motor is designed to prevent any lubricating oil from leaving any of the bearings.

Accepted Answer

A) True 
 B)False

Exam 18: Application of Motors

The motor that should be used in a potentially wet area is a(n) ____ motor.

Explain the difference between a "rigid" mount and a "resilient" rubber motor mount.

If the applied voltage is too high, the motor may develop local hot spots within its windings, but it will not always experience ____________________.

The alignment of a motor and the driven mechanism must be done at room temperature and ____.

A belt-driven blower assembly that has a resilient mounting requires a grounding strap. Why?

What is the major advantage of a ball bearing motor over the sleeve bearing motor?

Why are explosion-proof motors not normally used on standard equipment?

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.

When servicing and lubricating a motor, why must a technician use the proper oil?

The width of a drive belt is classified as ____.

Name four basic methods for mounting motors.

A sleeve bearing would typically be used in a motor that operates with a ____.

The device that transfers the motor's energy to the driven component is called the _________________________.

A direct-drive motor is usually connected to a load with a ____.

Explain how a technician can verify that a motor is operating within nameplate parameters.

If the voltage supplied to the motor is well below the motor rated voltage, the current draw will be ____ it should be.

The alternating current frequency supplied by the power companies in the United States is ____________________ hertz.

The voltage tolerance of a standard electric motor is ____.

Whenever possible, when changing a motor, the _________________________ should be obtained.

A drip-proof motor is designed to prevent any lubricating oil from leaving any of the bearings.

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