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.Management Sciences
Category: A.C. Fundamentals, Circuits and Circuit Theory
A pure inductance connected across 250 V, 50 Hz supply consumes 100 W. This consumption can be attributed to_________?
A. the big size of the inductor
B. the reactance of the inductor
C. the current flowing in the inductor
D. the statement given is false
In a pure capacitive circuit if the supply frequency is reduced to 1/2, the current will__________?
A. be reduced by half
B. be doubled
C. be four times at high
D. be reduced to one fourth
In a purely inductive circuit__________?
A. actual power is zero
B. reactive power is zero
C. apparent power is zero
D. none of above is zero
Two waves of the same frequency have opposite phase when the phase angle between them is_________?
A. 360°
B. 180°
C. 90°
D. 0°
Which of the following coil will have large resonant frequency __________?
A. A coil with large resistance
B. A coil with low resistance
C. A coil with large distributed capacitance
D. A coil with low distributed capacitance
In a loss-free R-L-C circuit the transient current is__________?
A. oscillating
B. square wave
C. sinusoidal
D. non-oscillating
Magnitude of current at resonance in R-L-C circuit________?
A. depends upon the magnitude of R
B. depends upon the magnitude of L
C. depends upon the magnitude of C
D. depends upon the magnitude of R, Land C
Wire-wound resistors are unsuitable for use at high frequencies because they_______?
A. create more electrical noise
B. are likely to melt under excessive eddy current heat
C. consume more power
D. exhibit unwanted inductive and capacitive effects
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