Question # 1

A simple device that prevents the direction of current from changing is called.

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Commutator

Rotor

Armature

Detector

Commentator was invented by

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Henry

Ousted

Maxwell

William sturgeon

A metal rod of 1 m is moving at a speed of 1 ms-1 in a direction making an angle 30^o with 0.5 T magnetic field . The emf produced is.

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0.25 N

2.5 N

0.25 V

2.5 V

The Lenz's law is also statement of:

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Law of conservation of mass

Law of conservation of charge

Law of conservation of energy

Law of conservation of momentum

The application of mutual induction is a.

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D.C. motor

Radio

Television

Transformer

Self induction does not depend on

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Number of turns of the coil

Area of cross section of the core

Nature of material of the core

Current through inductor

The illustration of the phenomenon of mutual induction is in the device of

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Transformer

Inductor

A.C. Generator

Ammeter

In A.C. inductor behaves as

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Capacitor

Resistor

Commutator

Transistor

DC generator by william Sturgeon in:

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1894

1961

1834

1961

The device in which induced emf is statically induced emf is:

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Transforms

AC generator

Alevator

Dynamo

Lenz's law was given by Heinrich lenz in:

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1894

1904

1854

1834

If a step up transformer were 100% efficient the primary and secondary winging's would have the same.

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Current

Power

Voltage

Direction of winding

When the back emf in a current is zero, it draws

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Zero current

Maximum current

Minimum current

Steady average current

The magnitude of motional emf is given by

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Lenz's law presented in

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1834

1934

1826

1836

One henry is equal to

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1 ohm x 1 sec

1 ohm x 1 hertz

1 ohm x 1 metre

All of above

The device in the circuit that consume electrical energy are known as.

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Dissipaters

Generator

Load

Motors

The motional emf is give by

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qvB

IBL

eBL

vBL

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

In D.C. generator, split rings act as.

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Capacitor

Commutator

Resistor

Inductor

The mutual inductance between two coils depends upon their

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Size

Core material

Size, core material and separation

Separation

The motional emf depends upon the

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Length of conductor

Speed of conductor

Strength of magnet

All of these

Induced emf in A.C. generator can be increased by

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Decreasing area of coil

Decreasing magnetic field

Increasing area of coil

Slowing down speed of coil

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