41. Which sources produce alternating current (AC)?
42. Alternating current is converted into direct current by a
43. Speed regulation of synchronous motor is
44. A parallel-plate capacitor,with air in between the plates, has capacitance C. Now the space between the two plates of the capacitor is filled with a dielectric of dielectric constant 7. Then the value of the capacitance will become
45. A parallel-plate capacitor of capacitance C1 is made using two gold plates. Another parallel-plate capacitor of capacitance C2 is made using two aluminium plates with same plate separation, and all the four plates are of same area. If rg and ra are respectively the electrical resistivities of gold and aluminium, then which one of the following relations is correct?
46. Which compressor is usually used in AC?
47. The best material for the core of a transformer is
48. A transformer works on the principle of
49. Transformer is a device to convert
50. Atomic hydrogen has a life period of
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