Electromagnetic Induction & Alternating Currents-Resonance (NEET Physics): Questions 1 - 6 of 7

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Question number: 1

» Electromagnetic Induction & Alternating Currents » Resonance

MCQ▾

Question

The coefficient of induction of a choke coil is 0.1 H and resistance is 12Ω. If it is connected to an alternating current source of frequency 60 Hz, then power factor is approximately

Choices

Choice (4) Response

a.

0.1

b.

0.30

c.

0.2

d.

0.4

Question number: 2

» Electromagnetic Induction & Alternating Currents » Resonance

MCQ▾

Question

This circuit will resonate at ω equal to,

In given figure is LCR circuit diagram

In Given Figure Is LCR Circuit Diagram

In figure inductor, capacitor and resistor connected in parallel with 200 V power supply.

Choices

Choice (4) Response

a.

200 rad s -1

b.

2000 rad s -1

c.

50 rad s -1

d.

500 rad s -1

Question number: 3

» Electromagnetic Induction & Alternating Currents » Resonance

MCQ▾

Question

The resonant frequency of a circuit is f. If the capacitance is made 4 times the initial values, then the resonance frequency will become

Choices

Choice (4) Response

a.

f2

b.

f

c.

174

d.

Both a. and c. are correct

Question number: 4

» Electromagnetic Induction & Alternating Currents » Resonance

MCQ▾

Question

A 10 ohm resistance, 5 mH inductance coil and 10 µF capacitor are joined in series. When a suitable frequency alternating current source is joined to this combination, the circuit resonates. If the resistance is halved, the resonance frequency

Choices

Choice (4) Response

a.

is doubled

b.

is halved

c.

is quadrupled

d.

remains unchanged

Question number: 5

» Electromagnetic Induction & Alternating Currents » Resonance

MCQ▾

Question

The power factor of LCR circuit at resonance is

Choices

Choice (4) Response

a.

Zero

b.

1

c.

0.5

d.

0.707

Question number: 6

» Electromagnetic Induction & Alternating Currents » Resonance

MCQ▾

Question

The phase difference between the current and voltage of LCR circuit in series combination at resonance is

Choices

Choice (4) Response

a.

b.

π

c.

d.

π2

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