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Unit 18 > Unit 18 Quiz > Flashcards

Unit 18 Quiz Flashcards

1
Q

What type of mount does the motor have?

A

Flange mount

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2
Q

What type of mount is used on this motor?

A

Belly Band

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3
Q

What type of mount is used on this motor?

A

End mount

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4
Q

What type of mount is used on this motor?

A

Rigid

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5
Q

What type of mount is used on this motor?

A

Cradle

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6
Q

A belt is resting within the pulley grove of the drive motor. The diameter of the pulley is 5 inches. The distance from the outer edge of the belt to the edge of the pulley is 1/4”. What is the adjusted size of the pulley used to calculate the speed of the driven device?

A

5” - 1/4 - 1/4 = 4 1/2”

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7
Q

Two types of lubrication systems for sleeve bearings are the _____ and the _____ bearing.

A

Oil port, permanently lubricated

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8
Q

A belt driven compressor has the drive pulley reduced in size. The compressor’s speed will ________.

A

Decrease

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9
Q

What is a sign that a pulley is worn and needs to be changed?

A

The pulley surface becomes rough.

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10
Q

What is the correct method for installing belts over pulleys?

A

*Make sure the belt and pulley are “matched”.

*Place Belt over pulley with slack and adjust accordingly.

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11
Q

True or false: a B-width belt cannot be used with an A-width pulley.

A

True

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12
Q

True or false: The depth of A-width and B-width belts are the same.

A

True

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13
Q

True or false: When aligning two drive shafts, the measurements must be done at room temperature and checked again when the motor is at operating temperature.

A

True

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14
Q

True or false: Belt slippage will not cause premature wear on a pulley.

A

False

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15
Q

True or false: When converting an “L” width belt to an A-width belt, add 2.

A

False

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16
Q

True or false: To compute the speed of a blower, a minimum of two values must be known.

A

False

17
Q

True or false: Two belts marked with the same length are considered “matched” belts.

A

False

18
Q

True or false: A 3-phase motor with three power leads cannot be connected to a single-phase power supply.

A

True

19
Q

True or false: The “high leg”/“wild leg”/“crazy leg” can be found in a transformer using the wye/star configuration.

A

False

20
Q

True or false: A motor operating under a low voltage condition will cause the motor to draw more current.

A

True

21
Q

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

A

Roller

22
Q

A motor has a 4 inch pulley and a speed of 3600 rpm. The driven device uses a 5 inch pulley. What is the speed of the driven device?

A
23
Q

5 times RLA/FLA

A

Locked rotor amperage

24
Q

Provides 230V and can have a center tapped leg to furnish 115V. Also has a non-usable voltage of 185V from L3 to ground.

A

Delta transformer connection

25
Q

Either 2-wire power leads or 3-wire power leads.

A

Phase

26
Q

Normally used with fans, pumps and compressors. Some type of coupling must be installed between the motor and driven device.

A

Direct motor drive

27
Q

The amperage the motor is drawing when full load torque and horsepower is reached.

A

Full load amperage

28
Q

Y or star shaped connection with 3 windings going to a center tap neutral or grounded leg.

A

Wye transformer connection

29
Q

When taking replacement motor information, what are some of the important specs to give to the parts warehouse? List 10 of them.

A
  1. Phase of motor (single or3)
  2. FLA
  3. SF
  4. SFA
  5. Single or duel voltage
  6. Bearings single or mvhrspeed
  7. Hermatic or semi
  8. Capacitor rating (if needed)
  9. HP frame
  10. RPM
30
Q

The pulley on a motor is called the ____ pulley and the pulley on the blower wheel is called the ________.

A

Drive
Driven

31
Q

Extra credit
1. What is the difference between a synchronous motor and an asynchronous motor?

A
32
Q

Extra credit
2. You see “TEFC” on a motor data plate. What does it mean?

A

Totally enclosed fan cooled

33
Q

Extra credit
3. List the six types of refrigerant leaks.

A
  1. Micro leak
  2. Standing
  3. Pressure
  4. Vibration
  5. Temperature
  6. Combo dependent
34
Q

Extra credit
4. What does the capital letter after the refrigerant number signify for R-410A?

A

Same ingredients, different ratio

35
Q

Extra credit
5. What’s the difference between active recovery and passive recovery?

A

Active= recovery machine used
Passive= system pressure

Unit 18 (2 decks)

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