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Are You an Induction Motor Expert?

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Questions and Answers

What creates a rotating magnetic field in an induction motor?

A three-phase power supply (correct)

A two-phase power supply

A DC power supply

A single-phase power supply

What causes the rotor to turn in an induction motor?

The rotor field

The stator field

The induced currents in the stator windings

The induced currents in the rotor windings (correct)

What is slip in an induction motor?

The difference between the frequency of the power supply and the number of magnetic poles

The difference between the rated load and the maximum load

The difference between the number of magnetic poles in the rotor and the stator

The difference between synchronous speed and operating speed (correct)

What determines the synchronous speed of an AC motor?

The frequency of the power supply and the number of magnetic poles Signup and view all the answers

What is the typical speed-torque relationship of a standard NEMA Design B polyphase induction motor?

Linear or proportional to slip Signup and view all the answers

What is the slip range at full rated load for small or special purpose motors?

Between 1% and 5% Signup and view all the answers

Can an induction motor be used as an induction generator?

Yes Signup and view all the answers

What happens to the motor as load torque increases beyond breakdown torque?

The motor stalls Signup and view all the answers

Study Notes

A three-phase power supply creates a rotating magnetic field in an induction motor.
The induced currents in the rotor windings create magnetic fields that react against the stator field, causing the rotor to turn.
The rotor in an induction motor always operates slightly slower than synchronous speed, creating a slip.
An induction motor can be used as an induction generator or unrolled to form a linear induction motor.
The synchronous speed of an AC motor is determined by the frequency of the power supply and the number of magnetic poles.
The number of magnetic poles in the rotor is equal to the number of magnetic poles in the stator.
Slip is defined as the difference between synchronous speed and operating speed, determining the motor's torque.
At full rated load, slip varies from more than 5% for small or special purpose motors to less than 1% for large motors.
The typical speed-torque relationship of a standard NEMA Design B polyphase induction motor is linear or proportional to slip.
As load torque increases beyond breakdown torque, the motor stalls.

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Description

Test your knowledge of induction motors with this quiz! From the basics of how they work to their various applications, this quiz covers everything you need to know about induction motors. Keywords include three-phase power supply, rotor windings, slip, synchronous speed, magnetic poles, torque, and NEMA Design B. See how much you know about this important technology by taking this quiz now!