Practice Test: Question Set - 12
1. Mica capacitors are characterized by all of the following except
- (A) Stable operation
- (B) Accurate value
- (C) Low leakage reactance
- (D) Low losses
2. Dielectric strength ________ with increasing thickness
- (A) Increases
- (B) Decreases
- (C) Remains unaltered
- (D) None of the above
3. Electric displacement is a _________quantity.
- (A) Scalar
- (B) Vector
- (C) Both of the above
- (D) None of the above
4. The power dissipated in a pure capacitor is
- (A) Zero
- (B) Proportional to applied voltage
- (C) Proportional to value of capacitance
- (D) Both (B) and (C) above
5. A dielectric material must be
- (A) Resistor
- (B) Insulator
- (C) Good conductor
- (D) Semi conductor
6. If three 15 uF capacitors are connected in series, the net capacitance is
- (A) 5 uF
- (B) 30 uF
- (C) 45 uF
- (D) 50 uF
7. Paper condenser is
- (A) Always polarized
- (B) Usually of fixed value
- (C) Electrolytic condenser
- (D) A variable condenser
8. The minimum value of potential gradient in a cable occurs in
- (A) Insulation
- (B) Conductor
- (C) Outer sheath
- (D) Uniformly all over
9. If three 10 uF capacitors are connected in parallel, the net capacitance is
- (A) 20 uF
- (B) 30 uF
- (C) 40 uF
- (D) 50 uF
10. The dissipation factor of a good dielectric is of the order of
- (A) 0.0002
- (B) 0.002
- (C) 0.02
- (D) 0.2
11. In a capacitor the electric charge is stored in
- (A) Metal plates
- (B) Dielectric
- (C) Both (A) and (B)
- (D) None of the above
12. Which of the following capacitors will have the least value of breakdown voltage?
- (A) Mica
- (B) Paper
- (C) Ceramic
- (D) Electrolytic
13. Paper capacitors usually have a tolerance of
- (A) ± 5 %
- (B) ± 10 %
- (C) ± 15 %
- (D) ± 20 %
14. Dielectric strength of mica is
- (A) 10 to 20 kV/mm
- (B) 30 to 50 kV/mm
- (C) 50 to 200 kV/mm
- (D) 300 to 500 kV/mm
15. The unit of dielectric strength is given by
- (A) V/m
- (B) V2/m
- (C) m/V
- (D) m/V2
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