2-5 quiz

The secondary amperage available on a 25 kVA transformer at 240 volts is ?

104 A

If a qualified electrical worker has installed several 120 volt security lights and needs the total capacity of the transformer they should

Connect the coils in parallel

The Coil leads B and C emerge above the oil level in the ___?___ position

Crossed

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

Deenergized

PCBs may be present in distribution transformers manufactured after 1980 (T/F)

False

Transformers capacity is rated in kilowatts (T/F)

False

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

Qualified electrical workers

A Dash ( - ) between the primary and secondary voltages of a transformer is used to

Separate the voltages

"Alley Cat Bad Dog" is a good way to remember how the secondary leads are connected when connecting a 120/240 volt transformer for full capacity at 120 volts (T/F)

True

A distribution transformer may have its secondary coils connected in series or parallel (T/F)

True

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

True

Paralleling the secondary coils is often referred to as stacking the coils (T/F)

True

Two secondary bushings are to be used on a transformer when the secondary coils are connected in parallel (T/F)

True

With the secondary coils in parallel the full load is doubled but the resultant voltage remains the same as the voltage of one coil (T/F)

True

With the secondary coils in series the full load current remains the same as one coil (T/F)

True

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

X1

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

either voltage is available but not at the same time