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Physics
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Alternating Current
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Medium Questions
Alternating Current
Physics
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Statement A: With an increase in the frequency of AC supply inductive reactance increases.
Statement B: With an increase in the frequency of AC supply capacitive reactance increase.
A
A is true but B is false
B
Both A and B are true
C
A is false but B is true
D
Both A and B are false
Medium
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In series L-C-R resonant circuit, to increase the resonant frequency :
A
L will have to be increased
B
C will have to be increased
C
LC will have to be decreased
D
LC will have to be increased
Medium
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At low frequency a condenser offers :
A
high impedance
B
low impedance
C
zero impedance
D
impedance of condenser is independent of frequency
Medium
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If in a series L-C-R ac circuit, the voltages across R, L, C are
$V_{1},V_{2},V_{3}$
respectively. Then the voltage of applied AC source is always equal to :
A
$V_{1}+V_{2}+V_{3}$
B
$V_{1}+(V_{2}+V_{3})_{2} $
C
$V_{1}−V_{2}−V_{3}$
D
$V_{1}+(V_{2}−V_{3})_{2} $
Medium
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If the frequency of an alternating e.m.f. is f in L-C-R circuit, then the value of impedance Z
as log(frequency) increases :
A
increases
B
increases and then becomes equal to resistance, then it will start decreasing
C
decreases and when it becomes minimum, equal to the resistance then it will start increasing
D
go on decreasing
Medium
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An inductance and resistance are connected in series with an A.C circuit. In this circuit
A
the current and P.d. across the resistance lead P.d across the inductance by
$2π $
B
the current and P.d across the resistance lags behind the P.d. across the inductance by angle
$2π $
C
The current across resistance leads and the P.d across resistance lags behind the P.d across the inductance by
$2π $
D
the current across resistance lags behind and the P.d across the resistance leads the P.d across the inductance by
$2π $
Medium
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If a capacitor is connected to two different A.C. generators, then the value of capacitive reactance is:
A
directly proportional to frequency
B
inversely proportional to frequency
C
independent of frequency
D
inversely proportional to the square of frequency
Medium
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A capacitor is connected to an A.C. circuit, then the phase difference between current and the voltage is :
A
$π$
B
$2π $
C
$2−π $
D
Zero
Medium
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Ratio of impedance to capacitive reactance has
A
no units
B
ohm
C
ampere
D
tesla
Medium
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Statement ( A ) : The reactance offered by an inductance in A.C. circuit decreases with the increase of AC frequency.
Statement ( B ) : The reactance offered by a capacitor in AC circuit increases with the increase of AC frequency.
A
A is true but B is false
B
Both A and B are true
C
A is false but B is true
D
Both A and B are false
Medium
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>