Unsymmetrical part of the wave form
The quarter cycle
The half cycle
The whole cycle
Answer is Right!
Answer is Wrong!
A.c fundamentals, circuits and circuit theory
2. The frequency of an alternating current is
The speed with which the alternator runs
The number of cycles generated in one minute
The number of waves passing through a point in one second
The number of electrons passing through a point in one second
Answer is Right!
Answer is Wrong!
3. An
The current through the resistance is more
The current through the resistance is less
voltage is impressed across a pure resistance of 3.5 ohms in parallel with a pure inductance of impedance of 3.5 ohms, A. The current through the resistance is more B. The current through the resistance is less C. Both resistance and inductance carry equal currents
None of the above
Answer is Right!
Answer is Wrong!
4. The power factor of a D.C. circuit is always
Less than unity
Unity
circuit is always A. Less than unity B. Unity C. Greater than unity
Zero
Answer is Right!
Answer is Wrong!
Detailed SolutionThe power factor of a D.C. circuit is always
5. If resistance is 20 ohms. and inductance is 27 in a R-L series circuit, then time constant of this circuit will be
0.001 s
0.1 s
10 s
100 s
Answer is Right!
Answer is Wrong!
6. In a R-L-C circuit
Power is consumed in resistance and is equal to IR
Exchange of power takes place between inductor and supply line
Exchange of power takes place between capacitor and supply line
All above are correct
Answer is Right!
Answer is Wrong!
7. A pure inductance connected across 250 V, 50 Hz supply consumes 100 W. This consumption can be attributed to
The big size of the inductor
The reactance of the inductor
The current flowing in the inductor
The statement given is false
Answer is Right!
Answer is Wrong!
8. 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?
220 V
$$200sqrt 3 { ext{ V}}$$
$$ rac{{200}}{{sqrt 3 }}{ ext{ V}}$$
None of the above
Answer is Right!
Answer is Wrong!
9. Time constant of a circuit is the time in seconds taken after the application of voltage to each
25% of maximum value
50% of maximum value
63% of maximum value
90% of the maximum value
Answer is Right!
Answer is Wrong!
10. Pure inductive circuit
Consumes some power on average
Does not take power at all from a line
Takes power from the line during some part of the cycle and then returns back to it during other part of the cycle
None of the above
Answer is Right!
Answer is Wrong!