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