B.TechSemester 72022-23Electric DrivesKEE075

Electric Drives (KEE075) - AKTU Question Paper 2022-23

B.Tech · Semester 7 · Free PDF Download

This is the official AKTU Electric Drives Previous Year Question Paper for B.Tech Semester 7, academic session 2022-23. Published by Dr. A.P.J. Abdul Kalam Technical University (AKTU/UPTU), Lucknow. Free PDF download — no login required.

Course:B.Tech

Semester:Semester 7

Session:2022-23

University:AKTU / UPTU

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Questions Asked in 2022-23

Electric Drives (KEE075) — complete question paper

Section AAttempt all questions in brief. 2 x 10 = 20

a
Classified various mechanical loads on the basis of their speed-torque characteristics
b
What do you mean by constant power operation
c
Explain the concept of steady state stability?
d
What is meant by heating time constant of motor?
e
Write down various methods of reducing energy losses during starting
f
What are the advantages and disadvantages of electrical braking?
g
Mention various methods of power electronics control of ac motors
h
Why the thyristor control is preferred over Ward Leonard system of speed control? (i) What do you mean by cycloconverter. (j) Variable frequency control yields high torque to current ratio during starting. Why?

Section BAttempt any three of the following: 10 x 3= 30

a
Write a brief note on motors employed in electric drives
b
Explain the loading of an electric motor and its duty cycle with a simple diagram
c
Draw and explain the speed torque characteristics for dynamic breaking operation of DC series motor. Why torque becomes zero at finite speed?
d
Explain in detail the operation of DC separately excited motor fed by 3-ϕ fully controlled rectifier considering the continuous conduction mode
e
Explain how the Static Scherbius drive is used in slip power recovery scheme

Section CAttempt any one part of the following: 10 x 1= 10

a
Elucidate the multi-quadrant operation of Electric drive system
b
State the advantages of drive sy stem. Give some applications wi th suitable drive system
a
Explain the regenerative braking of separately excited DC motor
b
Derive, the expression to calculate the energy loss during starting of Induction motor and also state the various methods used to reduce the energy loss during starting
a
Comment on the stability of the operating points A, B, C, D in fig (1). Fig 1
b
Illustrate the Dynamics of motor load system. Also give compari son between DC and AC Drive
a
D r a w t h e b l o c k d i a g r a m o f a n e l e c t r i c d r i v e . E x p l a i n t h e f u n c t ion of Power modulator in detail
b
A 250V, 900 rpm and 200A separately excited dc motor has an arm ature resistance of 0.02Ω. The motor is fed from a chopper operating in dynamic braking with braking resistance of 0.2Ω (i) c alculate duty ratio of chopper for a motor speed of 600 rpm & braking torque twice the rated value (ii) what will b e motor speed for a duty ratio of 0.6 and motor torque equal to twice its rated torque
a
Describe the construction and working of brushless dc motor
b
Describe the construction and working of switched reluctance motor

Question text is extracted from the official AKTU question paper PDF above. Hindi translations are omitted — every question is printed in English in the original paper. Last verified: 2026-08-23.

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