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Electrical Engineering
A.C Fundamentals, Circuits And Circuit Theory
Quiz 3
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Q.1
At __________ frequencies the parallel R-L circuit behaves as purely resistive.
Low
Very low
High
Very high
Q.2
In AC. circuits, laminated iron is invariably used in order to
Reduce eddy current loss
Increase heat radiation
Make assembly cheap and easier
Reduce circuit permeability
Q.3
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
Q.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 the decrease of inductance and decrease of resistance
Increases with decrease of inductance and increase of resistance
Q.5
In an AC. circuit, a low value of kVAR compared with kW indicates
Low efficiency
High power factor
Unity power factor
Maximum load current
Q.6
If two sinusoids of the same frequency but of different amplitudes and phase angles are subtracted, the resultant is
A sinusoid of the same frequency
A sinusoid of half the original frequency
A sinusoid of double the frequency
Not a sinusoid
Q.7
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
Q.8
The form factor is the ratio of
Peak value to r.m.s. value
r.m.s. value to average value
Average value to r.m.s. value
None of the above
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?
220 V
220 v3 V
220/v3 V
None of the above
Q.10
The power factor of a D.C. circuit is always
Less than unity
Unity
Greater than unity
Zero
Q.11
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
Q.12
Skin effect occurs when a conductor carries current at _________ frequencies.
Very low
Low
Medium
High
Q.13
In a parallel R-C circuit, the current always _________the applied voltage
Lags
Leads
Remains in phase with
None of the above
Q.14
All the rules and laws of D.C. circuit also apply to A.C. circuit containing
Capacitance only
Inductance only
Resistance only
All above
Q.15
Capacitive susceptance is a measure of
Reactive power in a circuit
The extent of neutralization of reactive power in a circuit
A purely capacitive circuit's ability to pass current
A purely capacitive circuit's ability to resist the flow of current
Q.16
The period of a sine wave is ___________ seconds. Its frequency is
20 Hz
30 Hz
40 Hz
50 Hz
Q.17
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
Q.18
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
Q.19
In a series resonant circuit, the impedance of the circuit is
Minimum
Maximum
Zero
None of the above
Q.20
In series resonant circuit, increasing inductance to its twice value and reducing capacitance to its half value
Will change the maximum value of current at resonance
Will change the resonance frequency
Will change the impedance at resonance frequency
Will increase the selectivity of the circuit
Q.21
Power factor of the following circuit will be zero
Resistance
Inductance
Capacitance
Both B and C
Q.22
A pure capacitor connected across an A.C. voltage consumed 50 W. This is due to
The capacitive reactance in ohms
The current flowing in capacitor
The size of the capacitor being quite big
The statement is incorrect
Q.23
Time constant of a capacitive circuit
Increases with the decrease of capacitance and decrease of resistance
Increases with the decrease of capacitance and increase of resistance
Increases with the increase of capacitance and decrease of resistance
Increase with increase of capacitance and increase of resistance
Q.24
Capacitive reactance is more when
Capacitance is less and frequency of supply is less
Capacitance is less and frequency of supply is more
Capacitance is more and frequency of supply is less
Capacitance is more and frequency of supply is more
Q.25
The equation of 50 Hz current sine wave having r.m.s. value of 60 A is
60 sin 25 t
60 sin 50 t
84.84 sin 3141
42.42 sin 314 t
Q.26
In a pure inductive circuit if the supply frequency is reduced to 1/2, the current will
Be reduced by half
Be doubled
Be four times as high
Be reduced to one fourth
Q.27
Form Factor is the ratio of
Average value/r.m.s. value
Average value/peak value
r.m.s. value/average value
r.m.s. value/peak value
Q.28
In a pure capacitive circuit if the supply frequency is reduced to 1/2, the current will
Be reduced by half
Be doubled
Be four times at high
Be reduced to one fourth
Q.29
A sine wave has a frequency of 50 Hz. Its angular frequency is __________ radian/second.
100 n
50 jt
25 JT
5 n
Q.30
Which of the following coil will have large resonant frequency?
A coil with large resistance
A coil with low resistance
A coil with large distributed capacitance
A coil with low distributed capacitance
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