Motors

Front

What is apparent power?

Back

Apparent power is the ratio of true power to the product of source voltage and total current.

Front

What is required for starting large DC motors?

Back

A starting resistance must be placed in series with the motor armature.

Front

In a series LC circuit, if the capacitor drops 170 volts and the inductor drops 50 volts, what is the total voltage?

Back

The total voltage is 120 volts.

Front

What does a synchronous motor use to obtain starting torque?

Back

A synchronous motor uses a squirrel cage winding to obtain starting torque.

Front

What happens if the resistance in a series RL circuit is greater than the inductance?

Back

The phase angle will be less than 45 degrees.

Front

Define true power.

Back

True power is the power actually consumed by a circuit.

Front

What is the role of a capacitor in a circuit?

Back

A capacitor stores electrical energy and releases it when needed.

Front

What is inductance?

Back

Inductance is the property of a conductor by which a change in current generates an electromotive force (EMF) in the conductor itself.

Front

What is the function of a contactor in motor circuits?

Back

A contactor is an electrically controlled switch used for switching a power circuit.

Front

What is the difference between AC and DC motors?

Back

AC motors run on alternating current, while DC motors run on direct current.