transformer info characteristics

Question 1

On a transformer nameplate, an X between the primary numbers means ?

Answer 1

either voltage is available but not at the same time

Question 2

On a transformer nameplate, a slash (/) between the secondary numbers means both voltages shown are available.

Answer 2

true

Question 3

If taps are available on the high voltage coil, the transformer must be ? before changing taps.

Answer 3

deenergized

Question 4

PCBs may be present in distribution transformers manufactured after 1980.

Answer 4

false

Question 5

The internal transformer lead marked D is always connected to ? in an additive transformer.

Answer 5

x1

Question 6

A dash (–) between the primary and secondary voltages of a transformer is used to ?

Answer 6

separate the voltages

Question 7

If a Qualified Electrical Worker has installed several 120-volt security lights and needs the total capacity of the transformer, he or she should ? .

Answer 7

connect the coils in parallel

Question 8

The coil leads B and C emerge above the oil level in the ? position.

Answer 8

crossed

Question 9

Two secondary bushings are to be used on a transformer when the secondary coils are connected in parallel.

Answer 9

true

Question 10

Paralleling the secondary coils is often referred to as stacking the coils.

Answer 10

true

Question 11

It is the ? responsibility to check the internal connections on a four bushing transformer prior to making the connections externally.

Answer 11

electrical worker

Question 12

Transformer capacity is rated in kilowatts.

Answer 12

false

Question 13

With the secondary coils in series, the full load current remains the same as one coil.

Answer 13

true

Question 14

With the secondary coils in parallel, the full load current is doubled, but the resultant voltage remains the same as the voltage of one coil.

Answer 14

true