Electrical Circuits MCQ Question with Answer

Electrical Circuits MCQ with detailed explanation for interview, entrance and competitive exams. Explanation are given for understanding.

Question No : 15
Which of the following conditions is not true for a series RLCcircuit at resonance?

Z = jXL

XL= XC

The power factor is one

The magnitude of Z is

Question No : 16
The current is ____ times the maximum current at half-power points of a resonance curve.

Question No : 17
A gang capacitor is a variable capacitor in which capacitance is varied by changing the

Dielectric

Number of plates

Plate area

Distance between plates

Question No : 18
In an ac circuit with inductive reactance ?, the

Phase angle of the circuit is always 45�

Voltage across the inductance must be 90� out o f-phase witht he applied voltage

Current through the inductance lags its induced voltage by 90�

Current through the inductance and voltage across it are180� outof-phase

Question No : 19
If three 9 mH inductors are connected in parallel without mutual inductance then the total i nductance is

3 mH

9 mH

27mH

18 mH

Question No : 20
What is the specific resistance of a pure germanium?

55 -cm

55 -m

55 -mm

55 k -m

Question No : 21
Two capacitors of capacitance 9 F and 18 F in series will have a total capacitance of

27 F

162 F

6 F

180 F