Electrical Drives &Control (6th semElectrical)

Question Bank( Electrical Drives &Control)

Unit :1

1) Enlist advantages of electrical drives.

2) State essential part of electrical drives.

3) What are the functions of power modulator?

4) Draw block diagram of electrical drive and explain briefly function of each block.

5) What is electrical drive?

6) Enlist factors to be considered for selection of electrical drive.

Unit :2

1) Explain different types of load on electrical drives.

2) Explain quadrilateral diagram of speed and torque characteristic (four quadrant operation)

3) Write a note on load torque and its classification.

4) Dynamic equation of motor load combination.

5) Determination of moment of inertia of a motor.

6) Write a note on stability of an electrical drive.

7) Write a note on load equalisation.

Unit :3

1) Explain speed torque characteristics of seperately excited D.C. motor.

2) Explain speed torque characteristic of DC shunt motor.

3) Explain speed torque characteristic of DC series motor.

4) Explain speed torque characteristic of PMDC motor.

5) Explain dynamic model of DC motor drive.

6) Explain speed control methods of DC series motor.

7) Explain speed control methods of DC shunt motor.

8) Explain ward leonard method of speed control.

9) Explain the 1-ɸ half wave converter drive for the speed control of separately excited dc motor with waveform.

10) Explain the 1-ɸ full wave converter drive for the speed control of separately excited dc motor with waveform.

11) Explain the 1-ɸ semi converter drive for the speed control of separately excited dc motor with waveform.

12) Explain the 1-ɸ dual converter  drive for the speed control of separately excited dc motor with waveform.

13) Explain the 3-ɸ half wave converter drive for the speed control of separately excited dc motor with waveforms at α=30˚, α=150˚.

14) Explain chopper controlled drive operation modes for the speed control of separately excited dc motor with waveform.

15) Explain principle of regenerative barking and speed control (2^nd quadrant operation) of drive using chopper.

16) Explain working of 2-quadrant operation of drive using chopper.(1^st and 2^nd quadrant operation)

17) Give 3points of comparison between converter fed dc drives and chopper fed dc drives.

18) Explain speed and position control scheme of dc motor using dynamic model of dc motor.

Unit :4

1) Explain speed torque characteristics of induction motor.

2) Explain stator voltage control of induction motor.

3) Explain V/f control of induction motor.

4) Explain the effect of non sinusoidal supply on VSI

5) Explain unipolar and bipolar PWM method for inverter.

6) Explain speed control methods of DC series motor.

7) Explain speed control methods of DC shunt motor.

8) Explain ward leonard method of speed control.

9) Enlist advantages of V/f control.

10) Explain the operating modes of doubly fed induction machine.

11) Explain working of static scherbius drive.

12) Explain closed loop speed control of induction motor using slip control scheme.

13) Explain closed loop speed control of induction motor using current limit control scheme.

14) Explain closed loop speed control of CSI fed induction motor drive.

15) Give 7 points of comparison between CSI and VSI.

Solve numericals based on theory and formulas used in chapter 2,3 and4.