Exam 28: Single-Phase Transformers

The amount of current that flows into a transformer primary when voltage is first applied is called current.

Most transformer cores are assembled from many thin sheets of metal. This type of construction is called .

A transformer in which the secondary voltage is more than the primary voltage is called a(n) transformer.

A transformer in which the secondary voltage is less than the primary voltage is called a(n) transformer.

A tape-wound core is assembled by .

The industrial use transformer that normally has 240 V or 480 V primary and a 120 V secondary is called a(n) transformer.

A transformer that has one winding, which is used for both the primary and secondary, is called a(n) .

A transformer has a 240 V primary and a 60 V secondary. With a 5 ohm load connected, what is the primary current?

A transformer has a 240 V primary and a 120 V secondary. With a 30 ohm load connected, what is the primary volt- amps?

What type of core is often found on high-voltage distribution transformers?

In a transformer, the turns of primary wire compared to the turns of secondary wire is called the ratio.

The transformer that converts a high voltage from the power company down to 240/120 V for homes and businesses is called a(n) transformer.

A transformer supplying a house with 240/120 V has a secondary which is center tapped. The conductor connected to the center is called the conductor.

The output winding of a transformer is called the winding.

An isolation transformer has the same input and output voltages.

What is a magnetically operated device that can change values of voltage, current, and impedance without changing frequency?

The power input winding of a transformer is called the winding.

A transformer has a 2:1 turns ratio. 120 V is applied to the primary. What is the secondary voltage?

Any transformer flux that does not follow the core and escapes into the surrounding air is called .

A transformer in which the primary and secondary are physically separated and not connected by a conductor is called a(n) transformer.