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Class 12 Physics
Alternating Current
Quiz 2
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The band width of a series resonant circuit is :
0%
f
0
/Q
0
0%
\(\frac{R}{2πL}\)
0%
\(\frac{R}{4πL}\)
0%
4R
Explanation
f
0
/Q
0
A rejector circuit is:
0%
series resonant circuit
0%
parallel resonant circuit
0%
LCR circuit
0%
None of these
Explanation
parallel resonant circuit
The inductive reactance of an inductor coil of \(\frac{1}{π}\) H at 50 Hz is:
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\(\frac{50}{π}\) Ω
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\(\frac{π}{50}\) Ω
0%
100 Ω
0%
50 Ω
Explanation
100 Ω
In pure inductive circuit current
0%
lags behind emf by π/2
0%
leads the emf by π/2
0%
lags behind emf by π
0%
leads the emf by π
Explanation
lags behind emf by π/2
The current through an inductor of 1H is given by I = 3t sin t. The voltage across the inductor of 1 H is:
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3 sin t + 3 cos t
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3 sin t + 3t cos t
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3 cos t + t sin t
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3t cos t + sin t
Explanation
3 sin t + 3t cos t
Two coils X and Y are connected in series across a 240 V, 50 Hz supply. The resistance of X is 5Ω and inductance of Y is 0.02 H. The power consumed is 3 kW and the power factor is 0.The impedance of the circuit is:
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0.144 Ω
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1.44 Ω
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14.4 Ω
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144 Ω
Explanation
14.4 Ω
In the above problem, the value of the resistance of the coil Y is:
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0.58 Ω
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5.8 Ω
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1.16 Ω
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11.6 Ω
Explanation
5.8 Ω
An electric circuit containing capacitor only suffers:
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equal resistance for A.C. and D.C.
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Resistance of A.C. > Resistance of D.C.
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Resistance for A.C. < Resistance of D.C.
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offers infinite resistance for D.C.
Explanation
offers infinite resistance for D.C.
The average power dissipation in pure inductance or capacitance is:
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\(\frac{1}{2}\) LI²
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\(\frac{3}{2}\) CV²
0%
either (a) or (b)
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zero
Explanation
zero
In the series L-C-R circuit, the voltmeter and ammeter readings are:
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V = 100 Volts, I = 2A
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V = 100 Volts, I = 5A
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V = 1000 Volts, I = 2A
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V = 300 Volts, I = 1A
Explanation
V = 100 Volts, I = 2A
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