Electrostatic

41. Dielectric strength of medium

1. increases with rise in temperature
2. increases with moisture content
3. is same for all insulating materials
4. none of the above

View answer

42. Dielectric strength of mica is

1. 10 to 20 kV/mm
2. 30 to 50 kV/mm
3. 50 to 200 kV/mm
4. 300 to 500 kV/mm

View answer

43. Electric displacement is a _________ quantity.

1. scalar
2. vector
3. both of the above
4. none of the above

View answer

44. Electric field intensity is a quantity

1. scalar
2. vector
3. both (a) and (6)
4. none of the above

View answer

45. Electric intensity at any point in an electric field is equal to the at that point.

1. electric flux
2. magnetic flux density
3. potential gradient
4. none of the above

View answer

46. Energy stored in the electric field of a capacitor C when charged from a D.C source of voltage V is equal to joules

1. CV2
2. C2V
3. CV2
4. CV

View answer

47. For a good 0.05 uF capacitor ohmmeter reading should

1. show low resistance momentarily and back off to a very high resistance
2. show high resistance momentarily and then a very low resistance
3. go quickly to 50 ohm approximately and remain there
4. not move at all

View answer

48. For closer tolerances which of the following capacitors is usually preferred?

1. Paper capacitor
2. Mica capacitor
3. Ceramic disc capacitor
4. None of the above

View answer

49. For making a capacitor, it is better to select a dielectric having

1. low permittivity
2. high permittivity
3. permittivity same as that of air
4. permittivity slightly more than that of air

View answer

50. For which of the following parameter variation, the capacitance of the capacitor remains unaffected?

1. Distance between plates
2. Area of the plates
3. Nature of dielectric
4. Thickness of the plates

View answer