Test: AC Power Analysis
10 Questions MCQ Test Topicwise Question Bank for Electronics Engineering | Test: AC Power Analysis
The value of 
for the waveform shown below is
for the waveform shown below isFor the square wave shown in given figure,
For the idealized full wave rectifier system the average and rms value of the voltage is
The instantaneous power delivered to the 5 Ω resistor at t = 0 in the given circuit is
At t = 0, the given circuit is as shown below.
∴ 
For a sinusoidal waveform, the ratio of average to rms value is
For a sinusoidal waveform,
An impedance of (3 + j 4) Ω is connected in parallel with a resistance of 10 Ω. The ratio of power loss in these parallel circuits is
A 0.2 HP induction motor runs at an efficiency of 85%. If the operating power factor is 0.8 lag, the reactive power taken by the motor is
∴ Reactive power taken by motor is
In an a.c. circuit, v = 100 sin (ωt + 30°) V, i = 5 sin(ωt- 30°) A. The apparant and reactive power in the circuit are respectively
The inductive reactance in series with Z in the circuit shown below has a value of 25 Ω If the voltage drop a cross Z is 179 volts, the power dissipated in the circuit is 320 W.
The reactive part of Z is
Now, power dissipated,
The values of current I1 and I2 in the circuit shown below are given by:
1A = (0.8 + j0.2) A and I2 = -(1 - j0.5) A
The total power lost in the 5 Ω resistor is
Power lost in the 5Ω resistor is
(As current through 5 Ω resistor = I1 -I2)
The power factor of the circuit shown below is
Given, ω = 1 rad/sec. So, the circuit can be redrawn as shown below.
Total impedance of the circuit is
∴ p.f. of the given circuit = cos90° = 0
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