1
COMEDK 2022
+1
-0

A DC ammeter and a hot wire ammeter are connected to a circuit in series. When a direct current is passed through circuit, the DC ammeter shows 6 A. When AC current flows through circuit, what is the average readings in DC ammeter and the AC ammeter, if DC and AC currents flows simultaneously through the circuit?

A
DC = 6 A, AC = 10 A
B
DC = 3 A, AC = 5 A
C
DC = 5 A, AC = 8 A
D
DC = 2 A, AC = 3 A
2
COMEDK 2022
+1
-0

A series L-C-R circuit is connected to an AC source of 220 V and 50 Hz shown in figure. If the readings of the three voltmeters $$V_1,V_2$$ and $$V_3$$ are 65 V, 415 V and 204 V respectively, the value of inductance and capacitance will be

A
2.0 H, 5 $$\mu$$F
B
1.0 H, 5 $$\mu$$F
C
4.0 H, 6 $$\mu$$F
D
1.0 H, 2 $$\mu$$F
3
COMEDK 2022
+1
-0

An alternating voltage = 200 $$\sin 100t$$ is applied to a series combination of $$R=30\Omega$$ and an inductor of 400 mH. The power factor of the circuit is,

A
0.01
B
0.6
C
0.05
D
0.042
4
COMEDK 2022
+1
-0

The AC voltage across a resistance can be measured using a

A
hot wire voltmeter
B
moving coil galvanometer
C
potential coil galvanometer
D
moving magnetic galvanometer
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