26307-20 Transformers

Refer to figure provided. A multi tab transformer has 1620 turns in the primary. There are 40 turns between each tap. Top 6 and 3 are connected. Which taps must be connected to reduce output voltage by 5%.

• 5 and 4

• 6 and 2

• 7 and 2

• 7 and 4

The winding of a transformer that is connected to the load is known as the

• Capacitive winding

• Secondary winding

• Primary winding

• Power winding

Refer to the figure provided. Which taps should be connected to increase the secondary voltage by 5%?

• 5 and 2

• 5 and 4

• 7 and 2

• 7 and 4

Conductors connected to the high leg of four – wire Delta system should be color – coded

• Red

• Orange

• Green

• Black

The components installed to increase the power factor and decrease the cost of electricity caused by large inductive loads are

• Rectifiers

• Diodes

• Capacitors

• Resistors

To ensure maximum safety in a control transformer, the secondary control circuit is

• Isolated from the primary line circuit

• Connected to an auto transformer

• Controlled by taps

• Less than 120v

The walls and roof of a transformer volt must have a minimum fire resistance of

• 30 minutes

• 1 hour

• 2 hours

• 3 hours

The type of transformer can be ventilated, air-cooled, or sealed as

• Dry – type transformer

• Nonflammable fluid – insulated

• Oil – insulated transformer

• Les – flammable liquid – insulated transformer

Fasteners are covered in

• NEC article 402

• NEC article 424

• NEC article 440

• NEC article 460

A transformer can be checked for shorted turns using a

• VOM set to measure resistance

• VOM Set to measure current

• TTR tester

• Megger