EE SHORT NOTES AC 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, ]