AC Motors Quiz

Which of the following motors is/are types of AC motor?

• Series

• Synchronous

• Induction

• All of the above

A universal motor is a special type of :

• synchronous motor

• series motor

• parallel motor

• polyphase motor

The number of pole pairs required to establish a rotating magnetic field in a multiphase motor stator is determined by which of the following factors?

• The magnitude of the voltage

• The magnitude of the current

• The number of phases

• The size of the motor

In a two-phase motor stator, what is the angular displacement between the field poles?

• 0º

• 90º

• 180º

• 360º

Adjacent phase windings of a 3-phase motor stator are what total number of degrees apart?

• 30º

• 90º

• 120º

• 180º

Which of the following types of motors has a constant speed from no load to full load?

• Series

• Synchronous

• Induction

• Universal

What type of ac motor is the most commonly used?

• Induction

• Series

• Synchronous

• Two-phase

What term applies to the difference between the speed of the rotating stator field and the rotor speed?

• Slip

• Synchronous

• Rotor error

• Torque

The speed of the rotor of an induction motor depends upon which of the following factors?

• The method of connecting the load

• The dc voltage applied to the rotor

• The torque requirements of the load

• The frequency of the input AC power and the number of poles in the stator

How could you change the direction of rotation for an asynchronous machine (ASM) with squirrel cage?

• Use secondary shaft on opposite side.

• Exchange three terminals with each other.

• Exchange two terminals with each other

• Possible only with mechanical solutions (gear box and clutch)