LCR Series Circuit and Resonance NEET Questions

Physics - Electromagnetic Induction and Alternating Currents

LCR Series Circuit and Resonance MCQ Questions


13.
In a series LCR circuit, if V_R = 100 V, V_L = 40 V, V_C = 40 V, the applied voltage is:
A.
180 V
B.
40 V
C.
100 V
D.
60 V
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ANSWER :
C. 100 V
14.
A series LCR circuit has V_R = 50 V, V_L = 80 V, V_C = 20 V. The applied voltage is:
A.
60 V
B.
100 V
C.
78 V
D.
150 V
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ANSWER :
C. 78 V
15.
In a series LCR circuit, if V_L = V_C, the phase angle φ between current and applied voltage is:
A.
180°
B.
90°
C.
0°
D.
45°
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ANSWER :
C. 0°
16.
In a series LCR circuit, R = 6 Ω, X_L = 9 Ω, X_C = 1 Ω, V_rms = 100 V. The RMS current is:
A.
100/(√{117}) A
B.
20 A
C.
10 A
D.
5 A
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ANSWER :
C. 10 A
17.
The phasor diagram of a series LCR circuit is used to represent:
A.
Only the current
B.
Both V and I with their relative phases
C.
Only the applied voltage
D.
Energy stored
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ANSWER :
B. Both V and I with their relative phases
18.
The voltage across the capacitor in a series LCR circuit at resonance is:
A.
Equal to applied voltage
B.
Zero
C.
Equal to V_L/2
D.
Maximum possible (could be very high)
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ANSWER :
D. Maximum possible (could be very high)