Home
Current Affairs January 2024

What is the correct answer?

4

The permeability of a material having a flux density of 5 Wb/m^2 is 10^-5 H/m. What is the value of magnetizing force?

A. 5 × 10^-5 N/Wb

B. 500 × 10^3 N/Wb

C. 4 × 10^7N/Wb

D. 4 × 10^7N/Wb

Correct Answer :

B. 500 × 10^3 N/Wb


Related Questions

What is the correct answer?

4

If the distance between two magnetic poles decreases by 2 timesa the force between them

A. decreases two times

B. increases four times

C. increases two times

D. decreases four times

What is the correct answer?

4

What revolves about the positive nucleus in a definite orbit?

A. Atom

B. Proton

C. Electron

D. Neutron

What is the correct answer?

4

The magnitude of the induced emf in a coil is directly proportional to the rate of change of flux linkages. This is known as

A. Joule's Law

B. Faraday's second law of electromagnetic induction

C. Faraday's first law of electromagnetic induction

D. Coulomb's Law

What is the correct answer?

4

The lagging effect between flux density of the material and the magne

A. Permeance

B. Eddy current

C. Hysteresis

D. R eluctance

What is the correct answer?

4

Lenz' law states that the direction of the induced emf and hence current

A. Is determined by the rate of current flux

B. Is found by the right hand rule

C. Is found by the left hand rule

D. Always opposes the cause producing it

What is the correct answer?

4

The straight line passing through the two poles of magnet is called

A. Real axis

B. Cartesian axis

C. Magnetic axis

D. Imaginary axis

What is the correct answer?

4

Defined as the number of lines per unit area through any substance in a plane at right angles to the lines of force

A. Flux

B. Flux lines

C. Flux density

D. Flux intensity

What is the correct answer?

4

Hipernik is an alloy containing __________ iron and __________ nickel.

A. 40% ; 60%

B. 60% ; 40%

C. 50% ; 50%

D. 70% ; 30%

What is the correct answer?

4

The magnetic potential in a magnetic circuit can be measured in terms of

A. Mmf

B. Emf

C. Farad

D. Coulomb

What is the correct answer?

4

As the magnetic intensity decreasesa the relative permeability of a magnetic material

A. decreases

B. remains the same

C. increases

D. becomes zero

What is the correct answer?

4

Hysteresis loss can be reduced by one of the following.

A. Increasing mmf of the circuit

B. Using material narrow hysteresis loop

C. Using ferromagnetic core

D. Laminating the magnetic circuit

What is the correct answer?

4

A 200-watt lamp working for 24 hours will consume approximately _____ units.

A.

B.

What is the correct answer?

4

Which of the following is a vector quantity?

A. Magnetic potential

B. Magnetic field intensity

C. Magnetic permeability

D. F lux density

What is the correct answer?

4

How is mutual inductance between two coils decreased?

A. By using a common core

B. By moving the coils closer

C. By moving the coils apart

D. By increasing the number of turns of either coil

What is the correct answer?

4

When a conductor is stationary and the magnetic field is moving or changing the emf induced is called

A. Statically induced emf

B. Mutually induced emf

C. Self induced emf

D. Dynamically induced emf

What is the correct answer?

4

The energy stored in an electrostatic field or electromagnetic field is called

A. Electromagnetic energy

B. Kinetic energy

C. Potential energy

D. R est energy

What is the correct answer?

4

In electro-mechanical conversion devices like generators and motors the reason why a small air gap is left between the rotor and stator is to

A. permit mechanical clearance

B. increase flux density in air gap

C. decrease the reluctance of magnetic path

D. complete the magnetic path

What is the correct answer?

4

Back emf refers to the

A. Current equal to the applied emf

B. Opposing emf

C. Current opposing the applied emf

D. Voltage opposing the applied emf

What is the correct answer?

4

Bonding of atoms that is due to the force of attraction between positive ions and a group of negative ions

A. Ionic bond

B. Covalent Bond

C. Electrostatic Bond

D. Metallic bond

What is the correct answer?

4

The mass of proton is __________ the mass of an electron.

A. equal to

B. about 1837 times

C. less than

D. 200 tim es

What is the correct answer?

4

The resistance of a material is ____________ its area of cross-section.

A. directly proportional

B. independent of

C. inversely proportional to

D. equal to

What is the correct answer?

4

______ is an electromagnet with its core in the form of a close magnetic ring.

A. S olenoid

B. Paraboloid

C. Toroid

D. Cycloid

What is the correct answer?

4

Hysteresis is a phenomenon of _________ in a magnetic circuit.

A. setting up constant flux

B. lagging of H behind B

C. lagging B behind H

D. leading B ahead H

What is the correct answer?

4

What is the other name for dielectric strength?

A. Breakdown voltage

B. Electric intensity

C. Potential gradient

D. Dielectric constant

What is the correct answer?

4

What type of bond is formed when there exists some form of collective interactions between the (negatively charged) electrons and (positively charged) nuclei in a solid?

A. Ionic

B. Covalent

C. Metallic

D. Van der Waals

What is the correct answer?

4

If the value of 25 a conductor is 1/255 per oCa then the value of 20is

A. 1/300 per oC

B. 1/250 peroC

C. 1/230 per oC

D. 1/260 per oC

What is the correct answer?

4

Which of the following has the least number of valence electrons?

A. Conductor

B. Semiconductor

C. Insulator

D. Semi- insulator

What is the correct answer?

4

The temperature coefficient of resistance of insulators is

A. zero

B. negative

C. positive

D. infinite

What is the correct answer?

4

Amorphous solid is also called

A. Crystalline

B. Non- crystalline

C. Polycrystalline

D. Homogenous

What is the correct answer?

4

The force which set ups or tends to set up magnetic flux in a magnetic circuit

A. Dynamic force

B. Electromotive force

C. Potential difference

D. Magnetomotive force