Circuit Theory Online Quiz test2

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1. Inductance affects the direct current flow ______.
only at the time of turning off	only at the time of turning on
at the time of turning on and off	at all the time of operation

2. Question2
Inductance of a coil Varies	directly as the cross-sectional area of magnetic core
inversely as the length of the iron path	as (a) to (c)

3. All the rules and laws of D.C. circuit also apply to A.C. circuit containing _____.
capacitance only	inductance only
resistance only	all of the above

4. Time constant of an inductive circuit
increases with increase of inductance and decrease of resistance	increases with the increase of inductance and the increase of resistance
increases with decrease of inductance and decrease of resistance	increases with decrease of inductance and increase of resistance

5. Power factor of an inductive circuit is usually improved by connecting capacitor to it in ____.
parallel	series
either (a) or (b)	none of the above

6. In a highly capacitive circuit the ______.
apparent power is equal to the actual power	reactive power is more than the apparent power
reactive power is more than the actual power	actual power is more than its reactive power

7. Power factor of the following circuit will be zero.
resistance	inductance
capacitance	both (b) and (c)

8. Power factor of the following circuit will be unity
inductance	capacitance
resistance	both (a) and (b)

9. Power factor of the system is kept high
to reduce line losses	to maximise the utilization of the capacities of generators, lines and transformers
to reduce voltage regulation of the line	due to all above reasons

10. The time constant of the capacitance circuit is defined as the time during which voltage?
falls to 36.8% of its final steady value	rises to 38.6% of its final steady value
rises to 63.2% of its final steady value	none of the above

11. In a loss-free R-L-C circuit the transient current is ______.
oscillating	square wave
sinusoidal	non-oscillating

12. The r.m.s. value of alternating current is given by steady (D.C.) current which when flowing through a given circuit for a given time produces
the more heat than produced by A.C. when flowing through the same circuit	the same heat as produced by A.C. when flowing through the same circuit
the less heat than produced by A.C. flowing through the same circuit	none of the above

13. The square waveform of current has following relation between r.m.s. value and average value.
r.m.s. value is equal to average value	r.m.s. value of current is greater than average value
r.m.s. value of current is less than average value	none of the above

14. The double energy transient occur in the _____.
purely inductive circuit	R-L circuit
R-C circuit	R-L-C circuit

15. The transient currents are associated with the ______.
changes in the stored energy in the inductors and capacitors	impedance of the circuit
applied voltage to the circuit	resistance of the circuit

16. The power factor at resonance in R-L- C parallel circuit is _____.
zero	0.08 lagging
0.8 leading	unity

17. In the case of an unsymmetrical alternating current the average value must always be taken over
unsymmetrical part of the wave form	the quarter cycle
the half cycle	the whole cycle

18. In a pure resistive circuit
current lags behind the voltage by 90°	current leads the voltage by 90°
current can lead or lag the voltage by 90°	current is in phase with the voltage

19. In a pure inductive circuit
the current is in phase with the voltage	the current lags behind the voltage by 90°
the current leads the voltage by 90°	the current can lead or lag by 90°

20. In a circuit containing R, L and C, power loss can take place in ______.
C only	L only
R only	all of the above