Electrical Circuits

11. A capacitor opposes change in

1. Voltage
2. Current
3. Voltage and current
4. Neither voltage nor current

View answer

12. A capacitor requires 12 μC of charge to raise its potential of 3 V. What is the capacitance of the capacitor?

1. 36 μF
2. 15 μF
3. 0.25 μF
4. 4 μF

View answer

13. A circuit whose parameters change with voltage or current.

1. Non-linear circuit
2. Linear circuit
3. Complex circuit
4. Passive circuit

View answer

14. A coil of inductance L has an inductive reactance of XL in an ac circuit in which the effective current is I. The coil is made from a superconducting material. The rate at which power is dissipated in the coil is

1. 0
2. I²X_L
3. IX_L
4. IX_L²

View answer

15. A factor that states how much the resistance changes for a change in temperature?

1. Resistivity
2. Specific resistance
3. Coefficient of temperature change
4. Temperature coefficient of resistance

View answer

16. A gang capacitor is a variable capacitor in which capacitance is varied by changing the

1. Dielectric
2. Number of plates
3. Plate area
4. Distance between plates

View answer

17. A law which states that when a constant electromotive force is applied to a circuit consisting of a resistor and capacitor connected in series, the time taken for the potential on the plates of the capacitor to rise to any given fraction of its final value depends only on the product of capacitance and resistance.

1. Child's law
2. CR law
3. Coulomb's law
4. Debye T3 law

View answer

18. A lead conductor has a resistance of 25 Ω at 0 °C. Determine its resistance at -30 °C

1. 22 Ω
2. 24 Ω
3. 12 Ω
4. 11 Ω

View answer

19. A linear circuit is one whose parameters

1. Change with change in voltage
2. Change with change in current
3. Do not change with voltage and current
4. Change with change in voltage and current

View answer

20. A neon glow lamp used as a night light ionizes at approximately

1. 70 V
2. 80 V
3. 90 V
4. 100 V

View answer