EE SHORT NOTES-A.C. FUNDAMENTALS 3

41
The voltage of domestic supply is 220 V. This
figure represents-
r.m.s. value
[other wrong options are – Mean value, Peak value, Average value, ]

42
The shunt element of prototype high pass filter
is
Inductive
[other wrong options are – Resistive, Capacitive, Combination of L and C, ]
43
Which of the following statement is incorrect ?
Current source is a
passive element

[other wrong options are – Resistance is a passive element, Voltage source is
an active element, Conductance is a passive element, ]
44
In a series resonant circuit, the impedance of
the circuit is
Minimum
[other wrong options are – Maximum, Zero, Infinite, ]
45
Ohm is the unit of all of the following except
Capacitance
[other wrong options are – Inductive reactance, Capacitive reactance,
Resistance, ]
46
Skin effect occurs when a conductor carries
current at____ frequencies.
High
[other wrong options are – Very low, Low, Medium, ]
47
The time constant of a series R-C circuit is
given by
RC
[other wrong options are – R/C, RC2, R2C, ]
48
The double energy transient occur in the
R-L-C circuit
[other wrong options are – Purely inductive circuit, R-L circuit, R-C
circuit, ]
49
In a series resonant circuit, the impedance of
the circuit is
Minimum
[other wrong options are – Maximum, Zero, None of the above, ]
50
Form factor for a sine wave is
1.11
[other wrong options are – 1.414, 0.707, 0.637, ]
51
The r.m.s. value of a sine wave is 100A. Its peak
value is
70.7 A
[other wrong options are – 141.4A, 150A, 282.8 A, ]
52
The power factor of incandescent bulb is
Unity
[other wrong options are – 0.8 lagging, 0.8 leading, Zero, ]
53
The shunt element in a band pass filter is
Parallel combination
of L and C

[other wrong options are – Capacitive, Inductive, Series combination of L and
C, ]
54
The ratio of the bandwidth to the resonance
frequency is called the____ of the circuit.
Selectivity
[other wrong options are – Impedance, Susceptance, Quality factor, ]
55
In A.C. circuit the power curve is a sine wave
having
Double the frequency
of voltage

[other wrong options are – Same frequency as that of voltage, Half the
frequency of the voltage, None of these, ]
56
The r.m.s. value of pure cosine function is
0.707 of peak value
[other wrong options are – 0.5 of peak value, Same as peak value, Zero, ]
57
At very low frequencies a series R-C circuit behaves
as almost purely____
Capacitive
[other wrong options are – Resistive, Inductive, None of these, ]
58
In a R-L-C series circuit if voltage V across the
circuit is reduced to half the current I will change to
I/2
[other wrong options are – 2 I, 3/4 I, 5/8 I, ]
59
In the R – L – C containing R = 4.5ω L = 0.06 H,C
= 0.6 µF the power factor will be
Leading
[other wrong options are – Zero, Lagging, Unity, ]
60
Capacitive reactance is more when
 
Capacitance’sis less
and frequency of supply is less

[other wrong options are – 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, ]

                              Part 1  Part 2   Part 3  Part 4  Part 5

CURRENT AFFAIRS UPDATE 9 January to 22 January 2017
EE SHORT NOTES-A.C. FUNDAMENTALS 2

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