EE SHORT NOTES-A.C. FUNDAMENTALS 2

21
A sine wave of voltage varies from zero to
maximum of 200 V. How much is the voltage at the instant of 30° of the cycle
?
100V
[other wrong options are – 50V, 82.8V, 173.2 V, ]

22
The power consumed in a circuit element will be
least when the phase difference between the current and voltage
90°
[other wrong options are – 180°, 60°, 0°, ]
23
The form factor is the ratio of
r.m.s. value to
average value

[other wrong options are – Peak value to r.m.s. value, Average value to
r.m.s. value, None of these, ]
24
Which of the following is not a non-linear
element ?
Heater coil
[other wrong options are – Transistor, Diode, Electric arc with unlike
electrodes, ]
25
At half power points of a resonance curve, the
current is____ times the maximum current.
1/ √2
[other wrong options are – 1/2, √2, 2, ]
26
The product of apparent power and cosine of the
phase angle between circuit voltage and current is
True power
[other wrong options are – Reactive power, Volt-amperes, Instantaneous power,
]
27
The power is measured in terms of decibles in
case of
Electronic equipment
[other wrong options are – Transformers, Current transformers,
Auto-transformers, ]
28
The safest value of current the human body can
carry for more than 3 second is
9 mA
[other wrong options are – 4 mA, 15 mA, 25 mA, ]
29
The power factor at resonance in RLC parallel
circuit is
Unity
[other wrong options are – Zero, 0.08 Lagging, 0.8 Leading, ]
30
Capacitors for power factor correction are rated
in
kVAR
[other wrong options are – kW, kVA, kV, ]
31
For 200 V r.m.s. value triangular wave, the peak
voltage will be
346 V
[other wrong options are – 200 V, 222 V, 282 V, ]
32
Two waves of the same frequency have opposite
phase when the phase angle between them is
180°
[other wrong options are – 360°, 90°, 0°, ]
33
A network is said to be non-linear if it does not
satisfy
Both (A) and (B)
[other wrong options are – Homogeneity condition, Superposition condition,
Associative condition, ]
34
The value of operator j2 is equal to
 -1
[other wrong options are – Zero,  +1, √-1, ]
35
The power factor of a D.C. circuit is always
Unity
[other wrong options are – Less than unity, Greater than Unity, Zero, ]
36
At____ frequencies the parallel R-L circuit
behaves as purely resistive.
Very high
[other wrong options are – Low, Very low, High, ]
37
If resistance is 20 ω and inductance is 2H in a
RL series circuit, then time constant of this circuit will be
0.1 S
[other wrong options are – 0.001 S, 10 S, 100 S, ]
38
The transient currents are associated with the
Changes in the stored
energy in the inductors and capacitors

[other wrong options are – Impedance of the current, Applied voltage to the
circuit, Resistance of the circuit, ]
39
The best place to install a capacitor is
Across the terminals
of the inductive load

[other wrong options are – Very near to inductive load, Far away from the
inductive load, Any where, ]
40
For a sine wave with peak value Emax
the average value is
0.636 Emax
[other wrong options are – 0.707 Emax, 0.434 Emax,
1.414 Emax, ]

                              Part 1  Part 2   Part 3  Part 4  Part 5

EE SHORT NOTES-A.C. FUNDAMENTALS 3
EE SHORT NOTES-A.C. FUNDAMENTALS 1

Leave a Reply