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.Management Sciences
Category: A.C. Fundamentals, Circuits and Circuit Theory
At _______ frequencies the parallel R-L circuit behaves as purely resistive
A. low
B. very low
C. high
D. very high
In a highly capacitive circuit the__________?
A. apparent power is equal to the actual power
B. reactive power is more than the apparent power
C. reactive power is more than the actual power
D. actual power is more than its reactive power
Which of the following circuit component opposes the change in the circuit voltage ?
A. Inductance
B. Capacitance
C. Conductance
D. Resistance
Power factor of an inductive circuit is usually improved by connecting capacitor to it in____________?
A. parallel
B. series
C. either A. or (b)
D. none of the above
The effective resistance of an iron-cored choke working on ordinary supply frequency is more than its true resistance because of____________?
A. iron loss in core
B. skin effect
C. increase in temperature
D. capacitive effect between adjacent coil turns
A pure capacitor connected across an A.C. voltage consumed 50 W. This is due to________?
A. the capacitive reactance in ohms
B. the current flowing in capacitor
C. the size of the capacitor being quite big
D. the statement is incorrect
In a pure inductive circuit___________?
A. the current is in phase with the voltage
B. the current lags behind the voltage by 90°
C. the current leads the voltage by 90°
D. the current can lead or lag by 90°
The period of a wave is___________?
A. the same as frequency
B. time required to complete one cycle
C. expressed in amperes
D. none of the above
The time constant of the capacitance circuit is defined as the time during which voltage________?
A. falls to 36.8% of its final steady value
B. rises to 38.6% of its final steady value
C. rises to 63.2% of its final steady value
D. none of the above
The r.m.s. value and mean value is the same in the case of___________?
A. triangular wave
B. sine wave
C. square wave
D. half wave rectified sine wave
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