LCR Series Circuit and Resonance NEET Questions

Physics - Electromagnetic Induction and Alternating Currents

LCR Series Circuit and Resonance MCQ Questions


7.
In a series LCR circuit with X_C > X_L, the circuit behaves as:
A.
Capacitive; current leads voltage
B.
A short circuit
C.
Inductive
D.
Purely resistive
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ANSWER :
A. Capacitive; current leads voltage
8.
In a series LCR circuit at a frequency other than resonance, R = 3 Ω, X_L = 7 Ω, X_C = 3 Ω. The impedance is:
A.
7 Ω
B.
5 Ω
C.
√13 Ω
D.
10 Ω
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ANSWER :
B. 5 Ω
9.
A series LCR circuit has R = 10 Ω, X_L = 20 Ω, X_C = 20 Ω. The circuit is at:
A.
Resonance
B.
Inductive state
C.
Capacitive state
D.
Cut-off
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ANSWER :
A. Resonance
10.
A series LCR circuit with R = 12 Ω, X_L = 5 Ω, X_C = 0 has impedance:
A.
13 Ω
B.
7 Ω
C.
17 Ω
D.
12 Ω
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ANSWER :
A. 13 Ω
11.
In a series LCR circuit connected to V_rms = 100 V, if V_R = 60 V and V_L - V_C = 80 V, then V is:
A.
60 V
B.
160 V
C.
100 V
D.
140 V
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ANSWER :
C. 100 V
12.
A series LCR circuit has V_R = 40 V, V_L = 30 V, V_C = 0 V. The applied voltage is:
A.
50 V
B.
10 V
C.
25 V
D.
70 V
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ANSWER :
A. 50 V