1
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

$$220 \mathrm{~V}$$ ac is more dangerous than $$220 \mathrm{~V}$$ dc Why?

A
The peak value of ac is greater than the given value of dc
B
Shock received from ac is always repulsive
C
The frequency of ac is more than that of dc
D
The speed of ac is more than that of $$\mathrm{dc}$$
2
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

What should be the inductance of an inductor connected to $$200 \mathrm{~V}, 50 \mathrm{~Hz}$$ source so that the maximum current of $$\sqrt{2}$$ A flows through it?

A
$$\frac{\sqrt{2}}{\pi} H$$
B
$$2 \pi H$$
C
$$\frac{2}{\pi} \mathrm{H}$$
D
$$\frac{\pi}{2} H$$
3
COMEDK 2022
MCQ (Single Correct Answer)
+1
-0

During the phenomenon of resonance

A
the amplitude of oscillation becomes large
B
the frequency of oscillation becomes large
C
the time period of oscillation becomes large
D
All of the above
4
COMEDK 2022
MCQ (Single Correct Answer)
+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
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