tap changers and tap changers operation

Question 1

Ratio adjustment of a distribution transformer is accomplished by the use of a tap changing switch.

Answer 1

true

Question 2

Aluminum links or straps are used to make the connections on a transformer terminal board.

Answer 2

false

Question 3

A distribution transformer with taps has its primary in ?

Answer 3

2 coils

Question 4

In all tap settings on a transformer terminal board, 3 and 4 are always connected together.

Answer 4

true

Question 5

Older transformers (pre-1959) had all the taps below 100% in order to always increase the secondary voltage.

Answer 5

true

Question 6

Double-bushing tapped transformers normally have one tap above 100% in order to lower the secondary voltage.

Answer 6

true

Question 7

As the primary voltage drops, one would ? the percentage on the tap changer to raise the secondary voltage.

Answer 7

lower

Question 8

With the coils connected in series, a dual-voltage transformer will operate on ?

Answer 8

the higher of the two voltages

Question 9

The most common dual-voltage distribution transformer is rated at ?

Answer 9

14,000 * 7200 - 120/240

Question 10

The tap setting must always be set at ? before a distribution transformer is put into service.

Answer 10

100%