Power in AC Circuits, Wattless Current NEET Questions

Physics - Electromagnetic Induction and Alternating Currents

Power in AC Circuits, Wattless Current MCQ Questions


13.
The phase angle in an AC circuit with resistance R = 40Ω and inductive reactance XL = 30Ω is:
A.
tan⁻¹(30/40)
B.
tan⁻¹(40/30)
C.
tan⁻¹(40/50)
D.
tan⁻¹(50/40)
😑 View Answer Rough Work Error
ANSWER :
A. tan⁻¹(30/40)
14.
If the power factor of a circuit is 0.8, the angle of lag or lead is:
A.
53.1°
B.
45°
C.
36.9°
D.
60°
😑 View Answer Rough Work Error
ANSWER :
C. 36.9°
15.
In an LCR circuit at resonance, the power factor is:
A.
0
B.
1
C.
Between 0 and 1
D.
Depends on the circuit
😑 View Answer Rough Work Error
ANSWER :
B. 1
16.
The wattless component of current is given by:
A.
I sin(ϕ)
B.
I cos(ϕ)
C.
I²R
D.
I²Z
😑 View Answer Rough Work Error
ANSWER :
A. I sin(ϕ)
17.
A purely resistive AC circuit has a power factor of:
A.
1
B.
0
C.
Between 0 and 1
D.
Between -1 and 1
😑 View Answer Rough Work Error
ANSWER :
A. 1
18.
The condition for maximum power transfer in an AC circuit is:
A.
R = XL
B.
XL = XC
C.
Z = R
D.
R = Z
😑 View Answer Rough Work Error
ANSWER :
B. XL = XC