Deck 6: Introduction to Alternating Current

Question 1

Transmission voltages are often in the range of 138kVAC to 500kVAC.

Answer 1

True

Question 2

In a transformer, the primary coil is the output and the secondary coil is the input.

Answer 2

False

Question 3

Most high-voltage power transmission and distribution is three-phase AC.

Answer 3

True

Question 4

Power utilities use high-voltage single-phase generators and then use transformers to develop three-phase distribution.

Question 5

What are the two common three-phase configurations?

Question 6

The process of converting AC to DC is called ________________.

Question 7

The ability to transform AC to a higher or lower __________ using a transformer is a significant advantage of AC.

Question 8

What are the four types of sine wave measurements?

Question 9

AC voltage is stepped up or stepped down through ___________ action.

Question 10

Describe the principle of electromagnetic induction.

Question 11

Why is three-phase power more efficient than single-phase power?

Question 12

DC does not periodically go from plus (+) to minus (-) and does not pass through the ______________ axis.

Question 13

Explain the principle of mutual inductance.

Question 14

______________ is the displacement between two or more waveforms with respect to a reference point.

Question 15

The unit of measure for frequency is hertz (Hz).