1
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

In the $$\mathrm{A} . \mathrm{C}$$. circuit given below, voltmeters $$\mathrm{V}_1$$ and $$\mathrm{V}_2$$ read $$100 \mathrm{~V}$$ each. Find the reading of the voltmeter $$\mathrm{V}_3$$ and the ammeter $$\mathrm{A}$$.

COMEDK 2024 Evening Shift Physics - Alternating Current Question 12 English

A
220 V, 2 A
B
110 V, 2 A
C
110 V, 4 A
D
220 V, 1 A
2
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

A transformer has 400 turns in its primary winding and 800 turns in its secondary winding. The primary voltage is $$20 \mathrm{~V}$$ and the load in the secondary is 4 ohm. The current in the primary, assuming it to be an ideal transformer, is

A
40 A
B
20 A
C
4 A
D
2 A
3
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

A group of devices having a total power rating of 500 watt is supplied by an $$\mathrm{AC}$$ voltage $$E=200 \sin \left(3.14 t+\frac{\pi}{4}\right)$$. Then the r.m.s. value of the circuit current is

A
500 A
B
1 A
C
200 A
D
5 A
4
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

An AC voltage source of variable angular frequency $$\omega$$ and fixed amplitude $$\mathrm{V}_0$$ is connected in series with a capacitance $$\mathrm{C}$$ and an electric bulb of resistance $$\mathrm{R}$$ (inductance zero). When $$\omega$$ is decreased

A
the bulb switches off
B
total impedance of the circuit is unchanged
C
the bulb glows brighter
D
the bulb glows dimmer
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