Question # 1

The motional emf developed in a conduction depends upon.

Choose an answer

Length

Orientation

Magnetic field

All of the above

DC generator by william Sturgeon in:

Choose an answer

1894

1961

1834

1961

The Lenz's law is also statement of:

Choose an answer

Law of conservation of mass

Law of conservation of charge

Law of conservation of energy

Law of conservation of momentum

In A.C. generator , when plane of coil is perpendicular to magnetic field, then output of generator is.

Choose an answer

NwAB

2pi f

Maximum

Zero

Self inductance of a long solenoid is given by

Choose an answer

None of the above

the core of transformer is laminated so reduce.

Choose an answer

Magnetic loss

Hysteresis loss

Eddy current loss

Electric loss

If the north pole of a magnet moves away from a metallic ring

Choose an answer

Clockwise

Anticlockwise

First clockwise and then anticlockwise

None of above

With the speed of motor, magnitude of back emf

Choose an answer

Remain same

Increase

Decrease

First increases then decreases

The direction of induced current is always so as to oppose the change which causes the current, this is the statement of

Choose an answer

Lenz's law

Faraday's law

Ampere's law

Coulomb's law

The motional emf is give by

Choose an answer

qvB

IBL

eBL

vBL

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

Choose an answer

Armature

Commutators

Split rings

Source of emf

In case of inductor , energy is stored in the

Choose an answer

Electric field

Magnetic field

Potential field

Gravitational field

When back emf in motor is zero, it draws.

Choose an answer

Zero current

Minimum current

Maximum current

Steady current

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

Choose an answer

Will increase

Will decrease

Remain same

First increase then decrease

When the back emf is zero, its draws.

Choose an answer

Zero current

Minimum current

Maximum current

Steady current

Which of the following quantities remain constant in step up transformer?

Choose an answer

Current

Voltage

Power

Heat

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

Choose an answer

Faraday's law

Lenz's law

Ohm's law

Kirchhoff's 1st rule

In a coil current change from 2 to 4 A in .05 s . If the average induced emf is 8 V then coefficient of self-inductance is:

Choose an answer

0.2 henry

0.1 henry

0.8 henry

0.04 henry

SI unit of hennery which is.

Choose an answer

VSA-1

VS-1 A

VS-1A-1

VSA

Lenz's law is a consequence of the law of conservation of

Choose an answer

Charge

Momentum

Energy

Angular momentum

The magnitude of back emf:

Choose an answer

Increases with sped of motor

Decreases with speed of motor

Remains same

None of above

A real transformer does not change.

Choose an answer

Voltage level

Current level

Power level

Frequency

Energy density of an inductor is:

Choose an answer

UM=1/2μ_∘/B²

Um = 2μ_∘/B

UM = 1/2B²/μ_∘

Um = 2B²/μ_∘

More Classes

Other Links

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

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer