Electromagnetic Induction & Alternating Currents (NEET Physics): Questions 30 - 32 of 121

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Question number: 30

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

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.

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: 31

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

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 3 are correct

c.

1 and 2 are correct

d.

2 and 4 are correct

Question number: 32

» Electromagnetic Induction & Alternating Currents » Faraday's Law

MCQ▾

Question

A rectangular coil of size 10 cm x 20 cm has 60 turns. It is rotating about one of its diagonals in magnetic field 0.5 Wb/m 2 with a rate of 1800 revolution per minute. The induced e. m. f. in the coil can be,

(1) 111 V (2) 112 V

(3) 113 V (4) 114 V

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 3 are correct

c.

1, 2 and 3 are correct

d.

1 and 2 are correct

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