Q.1
At __________ frequencies the parallel R-L circuit behaves as purely resistive.
Q.2
In AC. circuits, laminated iron is invariably used in order to
Q.3
In the case of an unsymmetrical alternating current the average value must always be taken over
Q.4
Time constant of an inductive circuit
Q.5
In an AC. circuit, a low value of kVAR compared with kW indicates
Q.6
If two sinusoids of the same frequency but of different amplitudes and phase angles are subtracted, the resultant is
Q.7
Power factor of an inductive circuit is usually improved by connecting capacitor to it in
Q.8
The form factor is the ratio of
Q.9
In each of the three coils of a three phase generator, an alternating voltage having an r.m.s. value of 220 V is induced. Which of the following values is indicated by the voltmeters?
Q.10
The power factor of a D.C. circuit is always
Q.11
A pure inductance connected across 250 V, 50 Hz supply consumes 100 W. This consumption can be attributed to
Q.12
Skin effect occurs when a conductor carries current at _________ frequencies.
Q.13
In a parallel R-C circuit, the current always _________the applied voltage
Q.14
All the rules and laws of D.C. circuit also apply to A.C. circuit containing
Q.15
Capacitive susceptance is a measure of
Q.16
The period of a sine wave is ___________ seconds. Its frequency is
Q.17
The time constant of the capacitance circuit is defined as the time during which voltage
Q.18
The square waveform of current has following relation between r.m.s. value and average value.
Q.19
In a series resonant circuit, the impedance of the circuit is
Q.20
In series resonant circuit, increasing inductance to its twice value and reducing capacitance to its half value
Q.21
Power factor of the following circuit will be zero
Q.22
A pure capacitor connected across an A.C. voltage consumed 50 W. This is due to
Q.23
Time constant of a capacitive circuit
Q.24
Capacitive reactance is more when
Q.25
The equation of 50 Hz current sine wave having r.m.s. value of 60 A is
Q.26
In a pure inductive circuit if the supply frequency is reduced to 1/2, the current will
Q.27
Form Factor is the ratio of
Q.28
In a pure capacitive circuit if the supply frequency is reduced to 1/2, the current will
Q.29
A sine wave has a frequency of 50 Hz. Its angular frequency is __________ radian/second.
Q.30
Which of the following coil will have large resonant frequency?
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