LCR Series Circuit and Resonance NEET Questions

Physics - Electromagnetic Induction and Alternating Currents

LCR Series Circuit and Resonance MCQ Questions


1.
In a series LCR circuit, the voltage across L, C, and R are V_L, V_C, and V_R respectively. The total applied voltage V is:
A.
V_R × V_L × V_C
B.
√(V_R² + V_L² + V_C²)
C.
V_R + V_L + V_C
D.
√(V_R² + (V_L - V_C)²)
😑 View Answer Rough Work Error
ANSWER :
D. √(V_R² + (V_L - V_C)²)
2.
In a series LCR circuit, the current through all three elements is:
A.
Different in each element
B.
Zero through capacitor
C.
The same at every instant
D.
Maximum in resistor
😑 View Answer Rough Work Error
ANSWER :
C. The same at every instant
3.
In a series LCR circuit, V_R, V_L, V_C refer to voltage magnitudes. Which of the following is correct?
A.
V_L is in phase with I
B.
V_C leads I by 90°
C.
V_L lags I by 90°
D.
V_R is in phase with I
😑 View Answer Rough Work Error
ANSWER :
D. V_R is in phase with I
4.
The impedance of a series LCR circuit is:
A.
√(R² + X_L² + X_C²)
B.
√(R² + (X_L + X_C)²)
C.
√(R² + (X_L - X_C)²)
D.
R + X_L + X_C
😑 View Answer Rough Work Error
ANSWER :
C. √(R² + (X_L - X_C)²)
5.
The phase angle φ between source voltage V and current I in a series LCR circuit is:
A.
tan φ = R/(X_L - X_C)
B.
tan φ = (X_L - X_C)/R
C.
tan φ = X_L·X_C/R
D.
tan φ = R/X_L
😑 View Answer Rough Work Error
ANSWER :
B. tan φ = (X_L - X_C)/R
6.
In a series LCR circuit with X_L > X_C, the circuit behaves as:
A.
Power-free; current = 0
B.
Resistive; current and voltage in phase
C.
Capacitive; current leads voltage
D.
Inductive; voltage leads current
😑 View Answer Rough Work Error
ANSWER :
D. Inductive; voltage leads current