C:-Low
D:-Very low
Correct Answer:- Option-C
Question39:-in core type transformers the number of flux paths are
൧-2
B:-more than 2
C:-Half of the path
D:-single
Correct Answer:- Option-D
Question40:-The relation between the excitation current and magnetic flux of a transformer is
A:-Current leads flux
B:-Flux leads the current
:-They are in phase
D:-None of the above
Correct Answer:- Option-A
Question41:-The equivalent resistance and leakage reactance of a transformer can be found out by
A:-Open circuit test
B:-short circuit test
C:-polarity test
D:-None of the above
Correct Answer:- Option-B
Question42:-Hydro generator is the commercial name of
A:-Round rotor generator
-Cylindrical rotor synchronous generator
C:-Salient pole synchronous generator
D:-All the above
Correct Answer:- Option-C
Question43:-An electrical machine with lower efficiency will have
A:-Less losses
-More losses
C:-No losses
D:-Low operating cost
Correct Answer:- Option-B
Question44:-The effect of armature reaction under the pole shoes can be limited by
A:-Inter poles
-High reluctance pole tips
C:-Compensating windings
D:-All the above
Correct Answer:- Option-C
Question45:-DC motors are started by using starters because
A:-To increase the starting current
B:-To reduce the staring current
C:-To increase the speed
D:-none of the above
Correct Answer:- Option-B
Question46:-Swinburne 's test can not be performed on
A:-Shunt motor
B:-compound motor
C:-series motor
D:-All the above
Correct Answer:- Option-C
Question47:-which of the following are used as constant speed drive
A:-Dc shunt motor
-DC series motor
C:-DC compound motor
D:-All the above
Correct Answer:- Option-A
Question48:-No load slip of an induction motor is
A:-Large