Question # 1

When a motor is over loaded then the magnitude of back emf.

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Increases

Decreases

Remain constant

Zero

Step up transfer has a transformation ratio of 3:2. What is the voltage in secondary , If voltage in primary is 30 V?

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45 V

15 V

90 V

300 V

The direction of induced current is always so as to oppose the change which causes the current is:

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Faraday's law

Lenz's law

Ohm's law

Kirchhoff's 1st rule

The induced emf in a coil is proportional to:

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Magnetic flux through the coil

Rate of change of Magnetic flux through the coil

Area of the coil

Product of magnetic flux flux and area of the coil

Lenz's law presented in

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1834

1934

1826

1836

If speed of rotation of a generator is doubled the output voltage will be.

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Remain same

Double

Four time

One half

The jerks in D.C. motor are created by the use of.

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Armature

Commutators

Split rings

Source of emf

Michael Faraday and Joseph Henry belongs to

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England and USA

France and USA

China and USA

None of these

A current generator device converts:

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Mechanical energy into chemical energy

Chemical energy into electrical energy

Mechanical energy into electrical energy

Both b and c

By winding the coil around a less magnetic core, self induction.

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Will increase

Will decrease

Remain same

First increase then decrease

In self induction A coil is connected in__________ with battery and a rheostat.

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Parallel

Series

Both A and B

None of above

The self induction emf is some times called.

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Motional emf

Constant emf

Back emf

Variable emf

Which of the following converts electrical energy into mechanical energy.

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Transformer

A.C. generator

D.C. generator

D.C. motor

A.C is converted into D.C by

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Dynamo

Rectifier

Motor

Transformer

If 10 A current passes through 100 mH inductor, then energy stored is.

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100 J

5 J

20 J

Zero

The Si unit of Mutual inductance is:

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VA^-1S^-1

VAS^-1

VSA^-1

ASV^-1

The Direction of induced current is always so as to oppose the change which causes the current, is:

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Faraday's law

Lenz's law

Ohm's law

Kirchhoff' s1ast rule

Mutual induction has a practical role in the performance of the.

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Radio choke

Transformers

A.C. Generator

D.C. Generator

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Physics ICS Part 2 Chapter 15 Online MCQ's Test MCQs With Answers

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