31. The magnetising current of a transformer is usually small because it has
32. Which of the following insulating materials can withstand the highest temperature safely?
33. In case of 3-phase induction motors, plugging means
34. The main reason for generation of harmonics in a transformer could be
35. When secondary of a current transformer is open-circuited its iron core will be
36. Spacers are provided between adjacent coils
37. A shell-type transformer has
38. In Ns is the synchronous speed and s the slip, then actual running speed of an induction motor will be
39. Distribution transformers are generally designed for maximum efficiency around
40. Power transformers are generally designed to have maximum efficiency around
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