Power in AC Circuits, Wattless Current NEET Questions

Physics - Electromagnetic Induction and Alternating Currents

Power in AC Circuits, Wattless Current MCQ Questions


7.
For a purely inductive circuit, the phase difference between voltage and current is:
A.
π/4
B.
π/2
C.
π
D.
0
😑 View Answer Rough Work Error
ANSWER :
B. π/2
8.
Which component in an AC circuit is responsible for wattless current?
A.
Resistor
B.
Inductor
C.
Capacitor
D.
Battery
😑 View Answer Rough Work Error
ANSWER :
B. Inductor
9.
In a purely capacitive circuit, the current:
A.
Leads voltage by 90°
B.
Lags voltage by 90°
C.
In phase with voltage
D.
Out of phase with voltage
😑 View Answer Rough Work Error
ANSWER :
B. Lags voltage by 90°
10.
The real power consumed in an AC circuit is given by:
A.
VI
B.
VI cos(ϕ)
C.
V²/R
D.
I²Z
😑 View Answer Rough Work Error
ANSWER :
B. VI cos(ϕ)
11.
What is the unit of reactive power in an AC circuit?
A.
Joule
B.
Watt
C.
Volt
D.
VAR
😑 View Answer Rough Work Error
ANSWER :
D. VAR
12.
The impedance of an AC circuit with resistance R and reactance X is given by:
A.
R + X
B.
√(R² + X²)
C.
R² + X²
D.
R - X
😑 View Answer Rough Work Error
ANSWER :
B. √(R² + X²)