8/18/2019 EPUT _01
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E LECTRICAL E NGINEERING D EPARTMENTB.E. 4 th Sem. (EPUT:
_150906)
Ass !"me"t#$Ch%&te': 05
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Illumination:- Types of lamps, xtures & re ectors,
illumination schemes
for domestic, industrial & commercial premises, Lumen
requirements for
di erent categories .
Grid connected systems, system configuration, working
principles, limitations,
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1) Classify electric drives and state the factors affecting
selection of drive.2) tate the methods of speed control of shunt
motor. !"plain flu" control
#ethod with circuit diagram .$) %raw speed tor&ue
characteristics of following motors.
1. %.C. hunt motor, 2 %.C. eries motor, $.'hree (hase nduction
motor.
*) uggest suita+le .C. and %.C. drives for following
applications. Give reasons for the
same. 1. -ifts 2. lower $. /olling mills *. -athe.
*) 2*0volt d.c. shunt motor has a field resistance of *00 and
armature resistance of 0.1.
'he armature current is 0 mp and speed is 00 rpm. Calculate
additional resistance
re&uired in the field to increase the speed to1000 rpm for
the same armature current.ssume a straight line magneti3ation
curve.
) !"plain different methods of controlling speed of three phase
induction motors.4) 5hat do you understand +y load e&uali3ation
.%erive the e"pression for motor tor&ue when load
increases and decreases.6) !"plain 'ypes of enclosures used in
electric motor.7) 2 8.(, 009,* pole , 083 cage induction motor with
delta connected stator takes full load
current of $0 and has a slip of * .'he impedance per phase is $.
; .Calculate the starting
tor&ue and starting current taken from the supply if the
motor is started +y
