Electromagnetic Induction & Alternating Currents (AIIMS Physics): Questions 26 - 30 of 51

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Question number: 26

» Electromagnetic Induction & Alternating Currents » Alternating Currents

MCQ▾

Question

In an A. C. circuit containing only inductor, the voltage –

Choices

Choice (4) Response

a.

Leads the current by 180°

b.

Leads the current by 90°

c.

Lags the current by 90°

d.

Remains in phase with the voltage

Question number: 27

» Electromagnetic Induction & Alternating Currents » AC Generator and Transformer

MCQ▾

Question

The primary winding of a transformer has 750 turns whereas its secondary has 8250 turns. The primary is connected to a supply of 50 V, 50 Hz. The secondary will have an output of –

Choices

Choice (4) Response

a.

11 V, 50 Hz

b.

5 V, 5 Hz

c.

550 V, 50 Hz

d.

550 V, 500 Hz

Question number: 28

» Electromagnetic Induction & Alternating Currents » LCR Series Circuit

MCQ▾

Question

A capacitor of capacitance 1.5µF is connected in the tank circuit of an oscillator oscillating with a frequency of 2 kHz. If the current flowing in the circuit is 4 mA, the voltage across the capacitor will be –

Choices

Choice (4) Response

a.

0.18 V

b.

142 V

c.

0.21 V

d.

60.0 V

Question number: 29

» Electromagnetic Induction & Alternating Currents » LCR Series Circuit

Appeared in Year: 2005

MCQ▾

Question

A 50 Hz a. c. source of 50 volts is connected across R and C as shown in figure below. The voltage across R is 20 volts. The voltage across C is –

The series circuit diagram of resistance and capacitor

The Series Circuit Diagram of Resistance and Capacitor

In figure resistance R and capacitor C is connected in series, with 50 Hz a. c. source of 50 volts supply.

Choices

Choice (4) Response

a.

46 V

b.

90 V

c.

25 V

d.

9 V

Question number: 30

» Electromagnetic Induction & Alternating Currents » Induced EMF and Current

MCQ▾

Question

A coil of copper having 1600 turns is placed in a magnetic field (B=4×103T) perpendicular to its plane. The cross sectional area of the coil is 0.07 m2. If it turns through 180° in 0.04 sec, then the induced emf in the coil is –

Choices

Choice (4) Response

a.

22.4 V

b.

2.24 V

c.

0.224 V

d.

224 V

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