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.Management Sciences
Category: A.C. Fundamentals, Circuits and Circuit Theory
Time constant of a circuit is the time in seconds taken after the application of voltage to each___________?
A. 25% of maximum value
B. 50% of maximum value
C. 63% of maximum value
D. 90% of the maximum value
In a circuit containing R, L and C, power loss can take place in____________?
A. C only
B. L only
C. R only
D. all above
The peak value of a sine wave is 200 V. Its average value is___________?
A. 127.4 V
B. 141.4 V
C. 282.8 V
D. 200V
Time constant of a capacitive circuit__________?
A. increases with the decrease of capacitance and decrease of resistance
B. increases with the decrease of capacitance and increase of resistance
C. increases with the increase of capacitance and decrease of resistance
D. increase with increase of capacitance and increase of resistance
In a series resonant circuit, the impedance of the circuit is___________?
A. minimum
B. maximum
C. zero
D. none of the above
Which of the following refers to a parallel circuit ?
A. The current through each element is same
B. The voltage across element is in proportion to it’s resistance value
C. The equivalent resistance is greater than any one of the resistors
D. The current through any one element is less than the source current
If resistance is 20 Q. and inductance is 27 in a R-L series circuit, then time constant of this circuit will be________?
A. 0.001 s
B. 0.1 s
C. 10 s
D. 100 s
Ohm is unit of all of the following except___________?
A. inductive reactance
B. capacitive reactance
C. resistance
D. capacitance
The equation of 50 Hz current sine wave having r.m.s. value of 60 A is____________?
A. 60 sin 25 t
B. 60 sin 50 t
C. 84.84 sin 3141
D. 42.42 sin 314 t
Skin effect occurs when a conductor carries current at_______ frequencies
A. very low
B. low
C. medium
D. high
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