Module 26202-20: DC and AC Motors Worksheet

Front

In a DC motor, the armature turns and cuts through the lines of magnetic force produced by the _________.

Back

field poles

Front

Which of the following is TRUE regarding the neutral plane in a single-loop DC motor? _________.

Back

No torque is produced in the neutral plane.

Front

The approximate horsepower of a 15,000W DC motor is _________.

Back

20hp

Front

Which of the following motors is the BEST choice for an application requiring adjustable speeds?
Options: Shunt DC, Synchronous, Universal, Stepper

Back

Shunt DC

Front

A polyphase synchronous motor has three stator windings that are _________

Back

120° apart

Front

Which of the following motors is used to provide high starting torque and constant speed under load? Compound, Shunt, Series, Universal

Back

Compound

Front

The synchronous speed at which a four-pole, 50Hz induction motor operates is _________.

Back

1,500 rpm

Front

For a given number of poles, which of the following determines the speed of an AC motor?
Options: frequency, voltage, resistance, capacitance

Back

frequency

Front

The speed of a three-phase squirrel cage induction motor is controlled by the frequency of the applied voltage and the _________

Back

number of poles

Front

A wound-rotor induction motor is used _________

Back

For speed control and to limit starting current