Electrical Circuits MCQs Part 02

Electrical Circuits MCQs Part 02

11. What is the other name of relative permittivity?
A. Dielectric strength
B. Potential gradient
C. Breakdown voltage
D. Specific inductance capacity
12. In a series RLC circuit
A. The current lags VL by 90˚
B. The current leads VL by 90˚
C. XL leads Xc by 90˚
D. Z = jXL at resonance

13. Resistor with colored bands in the body
A. Wire-wound resistor
B. Carbon-composition resistor
C. Potentiometer
D. Rheostat

14. In a resonant circuit, if Q ≥ 10 resonant frequency __________    bandwidth.
A. Bisects
B. Exceeds
C. Is less than
D. Is equal to

15. Which of the following conditions is not true for a series RLC circuit at resonance?
A. Z = jXL
B. XL = XC
C. The power factor is one
D. The magnitude of Z is √(R^2+〖(XL-XC)〗^2 )

16. The current is ____ times the maximum current at half-power points of a resonance curve.
A. 0.707
B. 1.414
C. 0.5
D. 0.632

17. A gang capacitor is a variable capacitor in which capacitance is varied by changing the
A. Dielectric
B. Number of plates
C. Plate area
D. Distance between plates

18. In an ac circuit with inductive reactance, the
A. Phase angle of the circuit is always 45˚
B. Voltage across the inductance must be 90˚ out-of-phase with the applied voltage
C. Current through the inductance lags its induced voltage by 90˚
D. Current through the inductance and voltage across it are180˚ out-of-phase

19. If three 9 mH inductors are connected in parallel without mutual inductance then the total inductance is
A. 3 mH
B. 9 mH
C. 27 mH
D. 18 mH

20. What is the specific resistance of a pure germanium?
A. 55 Ω-cm
B. 55 Ω -m
C. 5 Ω -mm
D. 55 k Ω -m