Electromagnetic Induction & Alternating Currents-Peak and RMS Value of AC (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 1 - 4 of 14

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Question number: 1

» Electromagnetic Induction & Alternating Currents » Peak and RMS Value of AC

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MCQ▾

Question

If an alternating voltage is represented as E = 141 sin (628t), then

(1) The rms voltage is 141V

(2) The rms voltage is 100V

(3) The frequency is 50 Hz

(4) The frequency is 100 Hz

Select the correct answers and mark it according to the following codes:

Choices

Choice (4) Response

a.

2 and 4 are correct

b.

1 and 2 are correct

c.

1 and 3 are correct

d.

1,2 and 3 are correct

Question number: 2

» Electromagnetic Induction & Alternating Currents » Peak and RMS Value of AC

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MCQ▾

Question

The r. m. s. value of an ac of 50 Hz is 10 A.

(1) Time taken by the alternating current in reaching from zero to maximum value is 5 x 10 -3 sec

(2) Time taken by the alternating current in reaching from zero to maximum value is 2 x 10 -3 sec

(3) The peak current is 14.14 A

(4) The peak current is 7.07 A

Select the correct answers and mark it according to the following codes:

Choices

Choice (4) Response

a.

1,2 and 3 are correct

b.

1 and 2 are correct

c.

1 and 3 are correct

d.

2 and 4 are correct

Question number: 3

» Electromagnetic Induction & Alternating Currents » Peak and RMS Value of AC

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MCQ▾

Question

An alternating voltage is connected to a 1 µF capacitor through an ac ammeter. The reading of the ammeter will be

Choices

Choice (4) Response

a.

10 mA

b.

20 mA

c.

80 mA

d.

40 mA

Question number: 4

» Electromagnetic Induction & Alternating Currents » Peak and RMS Value of AC

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MCQ▾

Question

The frequency of an alternating voltage is 50 cycles/sec and its amplitude is 120 V. Then the r. m. s value of voltage is

Choices

Choice (4) Response

a.

84.8V

b.

101.3V

c.

56.5V

d.

70.7V

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