Exam 15: Special Transformer Applications

Small and inexpensive devices are required to measure high voltages and currents directly.

A nearly constant voltage can be maintained on long distribution circuits by compensating for the voltage losses due to varying load conditions.

The ratio of two power values may be called the ____________________ ratio for the two-wattmeter Method.

The primary and secondary coils of the constant-current transformer are both placed on a(n) ____________________ steel laminated core.

Instrument transformers are used with instruments and relays to measure and control ac circuits.

List two typical uses of autotransformers.

A(n) ____________________ transformer takes power into its primary winding at a constant voltage and a variable current.

On what does the voltage of a circuit depend?

Discuss limitations on autotransformers.

What is the current that most series street lighting circuits require?

When the three-phase stationary primary windings are energized, a uniform magnetic field is set up inside the stator core.

Street lamp circuits may be connected in series or in ____________________.

A(n) ____________________ transformer has a sliding brush that can provide any voltage from 0 to full output voltage.

Discuss an induction voltage regulator.

The construction of the three-phase induction voltage regulator is similar to that of the single-phase regulator.