Q.1
In a pure inductive circuit
Q.2
In a pure resistive circuit
Q.3
For a sine wave with peak value Emax ___________ 8.30. the average value is
Q.4
The series and parallel resonance on L-C circuit' differs in that
Q.5
At very low frequencies a series R-C circuit behaves as almost purely
Q.6
In a series L-C circuit at the resonant frequency the
Q.7
In a circuit containing R, L and C, power loss can take place in
Q.8
Capacitors for power factor correction are rated in
Q.9
The power consumed in a circuit element will be least when the phase difference between the current and voltage is
Q.10
Ohm is unit of all of the following except
Q.11
If resistance is 20 Q. and inductance is 27 in a R-L series circuit, then time constant of this circuit will be
Q.12
In a loss-free R-L-C circuit the transient current is
Q.13
In an A.C. circuit power is dissipated in
Q.14
The input of an A.C. circuit having power factor of 0.8 lagging is 40 kVA
The power drawn by the circuit is
Q.15
The best place to install a capacitor is
Q.16
All definitions of power factor of a series R-L-C circuit are correct except
Q.17
The frequency of an alternating current is
Q.18
An A.C. voltage is impressed across a pure resistance of 3.5 ohms in parallel with a pure inductance of impedance of 3.5 ohms,
Q.19
Poor power factor
Q.20
Which of the following statements pertains to resistors only?
Q.21
Wire-wound resistors are unsuitable for use at high frequencies because they
Q.22
Form factor for a sine wave is
Q.23
The frequency of domestic power supply in India is
Q.24
The reactance offered by a capacitor to alternating current of frequency 50 Hz is 20 Q. If frequency is increased to 100 Hz, reactance becomes __________ ohms.
Q.25
Time constant of a circuit is the time in seconds taken after the application of voltage to each
Q.26
Pure inductive circuit
Q.27
When an alternating current passes through an ohmic resistance the electrical power converted into heat is
Q.28
The r.m.s. value of a sinusoidal A.C. current is equal to its value at an angle of ________ degrees.
Q.29
The peak value of a sine wave is 200 V. Its average value is
Q.30
The product of apparent power and cosine of the phase angle between circuit voltage and current is
0 h : 0 m : 1 s