CS/B.Tech/PWE/SEM-8/PWE-803B/2013
2013
ELECTRIC DRIVES
Time Allotted : 3 Hours Full Marks : 70
The figures in the margin indicate full marks.
Candidates are required to give their answers in their own words
as far as practicable.
GROUP – A
( Multiple Choice Type Questions )
1. Choose the correct alternatives for any ten of the following :
10x1 = 10
i) The load torques which usually retain their sign when
the direction of the drive motion ( rotation ) is changed
are
a) passive load torques
b) active load torques
c) both active and passive load torques
d) none of these.
ii) The armature control scheme for the speed control of
d.c. motor is used for
a) controlling the speed above the base speed
b) controlling the speed below the base speed
c) both (a) and (b)
d) none of these.
iii) In chopper fed drive the speed is controlled by
changing
a) the duty cycle
b) the firing angle
c) either (a) or (b) at a time
d) all of these.