Electromagnetic Induction & Alternating Currents (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 44 - 47 of 124

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Question number: 44

» Electromagnetic Induction & Alternating Currents » AC Generator and Transformer

MCQ▾

Question

Large transformer, when used for some time, become hot and are cooled by circulating oil. The heating of transformer is due to

(1) Heating effect of current

(2) Hysteresis loss

(3) Chemical effect of current

(4) Magnetic effect of current

Select the correct answers and mark it according to the following

Choices

Choice (4) Response

a.

1,2 and 3 are correct

b.

2 and 4 are correct

c.

1 and 2 are correct

d.

1 and 3 are correct

Question number: 45

» Electromagnetic Induction & Alternating Currents » Reactance and Impedance

MCQ▾

Question

An inductive circuit contains resistance of 10Ω and an inductance of 20 H. If an ac voltage of 120 V and frequency 60 Hz is applied to this circuit, the current would be nearly

Choices

Choice (4) Response

a.

0.80 A

b.

0.016 A

c.

0.32 A

d.

0.48 A

Question number: 46

» Electromagnetic Induction & Alternating Currents » Faraday's Law

MCQ▾

Question

The magnetic flux passing perpendicular to the plane of the coil and directed into the paper is varying according to the relation , where is in milli-weber and t is in second. Then the magnitude of emf induced in the loop when t = 2 second is-

Choices

Choice (4) Response

a.

-6 mV

b.

31 mV

c.

19 mV

d.

-14 mV

Question number: 47

» Electromagnetic Induction & Alternating Currents » Reactance and Impedance

MCQ▾

Question

A 20 volt ac is applied to a circuit consisting of a resistance and a coil with negligible resistance. If the voltage across the resistance is 12 V, the voltage across the coil is

Choices

Choice (4) Response

a.

6 volt

b.

16 volt

c.

8 volt

d.

10 volt

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