Module 2

Question 1

a device that can store electrical charge

Answer 1

Capacitor

Question 2

a capacitor motor having two different values of capacitance

Answer 2

Two-value capacitor motor

Question 3

a capacitor motor having only one value of capacitance

Answer 3

Single-value capacitor motor

Question 4

A(n) _____ is a device that can store electrical charge.

Answer 4

Capacitor

Question 5

What kind of capacitor has polarity markings, and must not be used in ac circuits?

Answer 5

Electrolytic

Question 6

A split-phase motor can be made to run as a capacitor-start motor by connecting a capacitor in _____ with the _____ winding.

Answer 6

Series; Start

Question 7

A(n) _____ must be established in a capacitor-start motor to produce the starting torque.

Answer 7

Rotating magnetic field

Question 8

In a split-phase motor, the start-winding current ____ the run-winding current, but it _____ the applied potential difference.

Answer 8

Leads: Lags

Question 9

What device in a power line is the short-circuit protective device for a motor?

Answer 9

Fuse or Circuit Breaker

Question 10

A dual-voltage motor can operate on either _____ V or _____ V.

Answer 10

120; 240

Question 11

A capacitor-start capacitor-run motor having two different values of capacitance is called a(n) _____ motor.

Answer 11

Tow-value capacitor

Question 12

A permanent-split capacitor motor has a(n) _____ instead of a centrifugal switch.

Answer 12

Low-value capacitor

Question 13

A reversible capacitor-run motor will not start without a capacitor in the circuit, because the windings are _____.

Answer 13

Identical

Question 14

Decreasing the rotor speed in a two-speed capacitor-run motor is accomplished by adding a(n) _____.

Answer 14

Auxiliary winding

Question 15

A short circuit occurs in a capacitor when the _____ material breaks down.

Answer 15

Dielectric

Question 16

Before disconnecting a capacitor from a motor, you must disconnect the _____.

Answer 16

Power supply

Question 17

Smoke from a motor may be caused by _____, _____, or ______.

Answer 17

Overload
Shorted windings
Faulty centrifugal switch

Question 18

If necessary, you can substitute by using a capacitor with a _____ voltage rating than the original

Answer 18

Higher

Question 19

If one capacitor in a two-capacitor motor is defective, should you replace both capacitor or only the bad one?

Answer 19

Both

Question 20

A capacitor is made to _____ an electric charge.

Answer 20

Store

Question 21

If you suspect a capacitor is defective, what should you do before you test it?

a. discharge the capacitor through a resistor
b. disconnect the capacitor leads
c. disconnect the power supply
d. all of the above

Answer 21

d. all of the above

Question 22

A capacitor for use in a 120V motor must be rated for _____ V.

a. 75 to 130
b. 130 to 150
c. 175 to 225
d. 250 to 300

Answer 22

b. 130 to 150

Question 23

If a capacitor motor has difficulty starting or has poor starting torque, the trouble may be

Answer 23

loose rotor bars

Question 24

A split-phase motor can be made to run as a capacitor-start motor by connecting a capacitor in _____ with the _____ winding.

Answer 24

series; start

Question 25

If you must substitute one capacitor for another, the best choice is one with a

Answer 25

higher voltage rating.

Question 26

Which of the following provide(s) thermal overload protection in some capacitor-start motors?

Answer 26

Bimetallic strip

Question 27

Two 100 uF capacitors connected in series have a combined capacitance of _____ uF.

Answer 27

50

Question 28

What is the purpose of the capacitor in a reversible capacitor-run motor?

Answer 28

a. to change the phase angle.

Question 29

Two 120 V capacitors connected in series have a combined voltage rating of _____ V.

Answer 29

240