Deck 13: Transformers

Question 1

The single-phase transformer is a simple alternating-current device.

Answer 1

True

Question 2

How is transformer impedance determined?

Answer 2

Transformer impedance is determined by the physical construction of the transformer.

Question 3

There is no voltage loss in high-voltage distribution circuits.

Answer 3

False

Question 4

The primary current at no load is called the ____________________.

Question 5

The transformer capacity is rated in kilovolt-amperes, not in kilowatts.

Question 6

Describe a transformer, in its simplest form.

Question 7

What are two advantages to a single-phase, three-wire system?

Question 8

A(n) ____________________ receives energy at the input winding at one voltage and delivers energy from the output winding at one voltage.

Question 9

In a(n) ____________________ test, the high-voltage winding is used as the primary and the low-voltage winding is short-circuited.

Question 10

The ____________________ may be described as an alternating-current device that transfers energy from one ac circuit to another ac circuit.

Question 11

A stepdown transformer delivers energy from the output winding at a higher voltage than at the input.

Question 12

A transformer does not require any moving parts to transfer energy.

Question 13

List the three factors that limit the amount of inrush current in the primary transformer.

Question 14

Describe the core-and-coil assembly.

Question 15

Magnetic materials contain tiny magnetic structures in their molecular material, known as ____________________.