AC Current Generators

Question 1

A coal-burning power plant is an example of a ______ plant.

a. fossil fuel
b. hydroelectric
c. nuclear
d. solar

Answer 1

a. fossil fuel

Question 2

In a hydroelectric plant, the energy created by ______ is converted, via turbines and generators, into electrical energy.

a. burning natural gas
b. burning oil
c. falling water
d. nuclear fission

Answer 2

c. falling water

Question 3

The time period of a waveform is measured in ______.

a. frequency
b. miles per second
c. hertz
d. seconds

Answer 3

d. seconds

Question 4

When the armature in an ac generator is at 90° of rotation, ______.

a. positive polarity is being generated
b. the conductor is not cutting through the magnetic field
c. no voltage is being generated
d. the brushes are not touching the slip ring

Answer 4

a. positive polarity is being generated

Question 5

What is the time period of a 100 Hz waveform?

a. 1/100 second
b. 1/10 second
c. 10 seconds
d. 100 seconds

Answer 5

a. 1/100 second

Question 6

If the time period of a waveform is 2 seconds, what is its frequency?

a. 1/4 Hz
b. 1/2 Hz
c. 2 Hz
d. 4 Hz

Answer 6

b. 1/2 Hz

Question 7

The term phase is sometimes written with which symbol?

a. §
b. Ω
c. μ
d. Φ

Answer 7

d. Φ

Question 8

If the peak value of an alternating current is 10 volts, what is the average value?

a. 31.4 volts
b. 12.74 volts
c. 3.14 volts
d. 1.274 volts

Answer 8

b. 12.74 volts

Question 9

When the average value of an alternating current is 10 volts, the peak value is ______.

a. 0.0637 volts
b. 0.157 volts
c. 6.37 volts
d. 15.7 volts

Answer 9

d. 15.7 volts

Question 10

If the peak value of an alternating current is 10 amps, what is the effective value?

a. 0.0707 amps
b. 0.1414 amps
c. 7.07 amps
d. 14.14 amps

Answer 10

c. 7.07 amps