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Electric Power Drives Module IV Quiz: Induction Motor Drives

10 Questions

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Electric Power Drives Module IV Quiz: Induction Motor Drives

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Questions and Answers

What is the advantage of Variable Frequency Control of Induction Motor Drive in terms of speed control and braking operation?

Speed control and braking operation are available only below synchronous speed

Speed control and braking operation are available only above synchronous speed

Speed control and braking operation are available from zero speed to above base speed (correct)

Speed control and braking operation are available only at synchronous speed

How does Variable Frequency Control of Induction Motor Drive enhance transient performance during starting, braking, and speed reversal?

By enabling operation at maximum torque with reduced current (correct)

By operating at minimum torque with increased current

By restricting operation only at synchronous speed

By allowing operation only at base speed

What effect does restricting the operation between synchronous speed and maximum torque point have on efficiency and power factor?

Increases both efficiency and power factor (correct)

No impact on efficiency and power factor

Increases efficiency but decreases power factor

Decreases efficiency and power factor

Why is the drop in speed from no load to full load small in Variable Frequency Control of Induction Motor Drive?

Due to low copper losses Signup and view all the answers

In the block diagram of Variable Frequency Control of Induction Motor Drive, what is the function of the Flux control block?

Produces a voltage command for the Variable Frequency Variable Voltage Source (VFVS) Signup and view all the answers

What is the purpose of introducing a delay circuit between the reference frequency f* and fr in the Variable Frequency Control scheme?

To allow gradual changes in frequency for better motor speed tracking Signup and view all the answers

What role does the variable frequency variable voltage source (VFVS) play in Variable Frequency Control of Induction Motor Drive?

Controls both voltage and frequency Signup and view all the answers

How does the variable frequency control affect the running performance of an induction motor?

Enhances both running and transient performance Signup and view all the answers

What impact does the restriction of motor operation between synchronous speed and maximum torque point have on copper losses?

Reduces copper losses Signup and view all the answers

What happens during transients in terms of current in Variable Frequency Control of Induction Motor Drive?

Increased current with maximum torque Signup and view all the answers