Unit 18 Quiz

Question 1

What type of mount does the motor have?

Answer 1

Flange mount

Question 2

What type of mount is used on this motor?

Answer 2

Belly Band

Question 3

What type of mount is used on this motor?

Answer 3

End mount

Question 4

What type of mount is used on this motor?

Answer 4

Rigid

Question 5

What type of mount is used on this motor?

Answer 5

Cradle

Question 6

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?

Answer 6

5” - 1/4 - 1/4 = 4 1/2”

Question 7

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

Answer 7

Oil port, permanently lubricated

Question 8

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

Answer 8

Decrease

Question 9

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

Answer 9

The pulley surface becomes rough.

Question 10

What is the correct method for installing belts over pulleys?

Answer 10

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

*Place Belt over pulley with slack and adjust accordingly.

Question 11

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

Answer 11

True

Question 12

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

Answer 12

True

Question 13

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.

Answer 13

True

Question 14

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

Answer 14

False

Question 15

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

Answer 15

False

Question 16

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

Answer 16

False

Question 17

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

Answer 17

False

Question 18

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

Answer 18

True

Question 19

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

Answer 19

False

Question 20

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

Answer 20

True

Question 21

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

Answer 21

Roller

Question 22

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?

Answer 22

Question 23

5 times RLA/FLA

Answer 23

Locked rotor amperage

Question 24

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

Answer 24

Delta transformer connection

Question 25

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

Answer 25

Phase

Question 26

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

Answer 26

Direct motor drive

Question 27

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

Answer 27

Full load amperage

Question 28

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

Answer 28

Wye transformer connection

Question 29

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

Answer 29

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

Question 30

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

Answer 30

Drive Driven

Question 31

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

Answer 31

Question 32

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

Answer 32

Totally enclosed fan cooled

Question 33

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

Answer 33

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

Question 34

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

Answer 34

Same ingredients, different ratio

Question 35

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

Answer 35

Active= recovery machine used Passive= system pressure