۸:٤
‎D:-Very low‏
‎Correct Answer:- Option-C‏
‎Question39:-in core type transformers the number of flux paths are‏
2ھ
‎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
‎C:-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
‎B:-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
‎Ar-Less losses‏
‎B:-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
‎B:-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:-Swinbumne '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
‎B:-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