-يم
‎B:-Vm‏
‏62
‎D:-3Vm‏
‎Correct Answer:- Option-A‏
‎Question69:-The number of comparators required in a 3 bit comparator type ADC is‏
ديم
‎B:-7‏
‏6:3
‏0-8
‎Correct Answer:- Option-B‏
‎Question70:-The rotor of a stepper motor has no‏
‎A:-Windings‏
‎B:-Commutator‏
‎C:-Brushes‏
‎D:-All of these‏
‎Correct Answer:- Option-D‏
‎Question71:-Which method of speed control cannot be used in 8 permanent magnet dc motor‏
‎A:-Ammature voltage variation‏
‎B:-Armature resistance control‏
‎C:-Varying the field current‏
‎D:-All of the above‏
‎Correct Answer:- Option-C‏
‎Question72:-Which test on a transformer provides information about regulation, efficiency and heading under load‏
‎conditions.‏
‎A:-open circuit test‏
‎B:-short circuit test‏
‎C:-Hopkinsons test‏
‎D:-back to back test‏
‎Correct Answer:- Option-D‏
‎Question73:-In a transformer the resistance between primary and secondary must be‏
‎A:-zero‏

D:-infinite
Correct Answer:- Option-D
Question74:-V curves for a synchronous motor represent relation between
A:field current and speed
B:-field current and power factor
C:-Armature current & field பாகர்‌
D:-Power factor and speed
Correct Answer:- Option-C
Question75:-An induction motor is expected to take largest starting current under which method of starting
A:-Direct online starting
B:-Starter-rotor starting
C:-star-delta starting
D:-Auto-transformer starting
Correct Answer:- Option-A
Question76:-The starting capacitor of a single phase motor is
A:-Electrolytic capacitor
B:-Ceramic capacitor
C:-Paper capacitor
D:-none of these
Correct Answer:- Option-A
Question77:-An elevator drive is required to operate in
A:-One quadrant only
B:-Two quadrant only
C:-Three quadrants only
D:-Four quadrants only