Electric Drives Questions and Answers, Set 6

Electric Drives Questions and Answers

Q1. 

What is the unit of resistance?

Answer :

ohm

Q2. 

Servo motors are an example of which type of load?

Answer :

Short time loads

Q3. 

The principle of step-up chopper can be employed for the ___

Answer :

Regenerative mode

Q4. 

Buck converter is used to _____

Answer :

Step down the voltage

Q5. 

Type-A chopper is used for obtaining which type of mode?

Answer :

Motoring mode

Q6. 

Rolling mills exhibit what type of load torque characteristics?

Answer :

Non-Linearly decreasing torque characteristics

Q7. 

Among the following which one exhibits linearly rising load torque characteristics?

Answer :

Separately excited dc generator connected to the resistive load

Q8. 

Which of the following are used in preventing the hunting phenomenon in synchronous generators?

Answer :

Damper bars

Q9. 

In an induction motor, when the number of stator slots is equal to an integral number of rotor slots _____

Answer :

The machine may fail to start

Q10. 

The conduction loss versus device current characteristic of a power MOSFET is best approximated by a _____

Answer :

Parabola

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