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Current Affairs January 2024

What is the correct answer?

4

Permeance is analogous to

A. Conductance

B. Reluctance

C. Admittance

D. Resistance

Correct Answer :

A. Conductance


Related Questions

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4

A law establishing the fact that the algebraic su of the rises and drops of the mmf around a closed loop of a magnetic circuit is equal to zero.

A. Kirchhoff's circuital law

B. Maxwell's circuital law

C. Ampere's circuital law

D. Coulomb's circuital law

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4

The induced emf in a wire loop that is moved parallel to a uniform magnetic field is

A. Zero

B. Dependent on the area of the loop

C. Dependent on the shape of the loop

D. Dependent on the magnitude of the field

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4

What is the SI unit of magnetic flux?

A. Tesla

B. Weber

C. Maxwell

D. Gauss

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4

All magnetic field originates from

A. moving electric charge

B. Iron atoms

C. Magnetic domain

D. Permanent magnets

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4

A magnetic pole produces 5000 field lines. How much is the flux in webers? A. 50 × 10^-6

A. 5 × 10^-6

B. 500 × 10^-6

C. 500 × 10^-5

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4

The force acting on a pole of 5 Wb is 25 N. What is the intensity of the magnetic field?

A. 5 N/Wb

B. 25 N/Wb

C. 125 N/Wb

D. 0.2 N/Wb

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4

The reluctance of a magnetic circuit is not dependent on which of the following?

A. Number of turns of coil

B. Magnetomotive force

C. Flux density in the circuit

D. Current in the coil

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4

Who discovered the most important electrical effects which is the magnetic effect?

A. Hans Christian Oersted

B. Sir Charles Wheatstone

C. Georg Ohm

D. James Clerk Maxwell

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4

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

A. Mmf

B. Emf

C. Farad

D. Coulomb

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4

Calculate the flux density that will be produced by the field intensity of 2000 a. t/m for a permeability of 126 x 10^-6 T/A.t/m

A. 0.252 G

B. 0.252 x 10^-2 T

C. 0.252 T

D. 0.252 x 10^-2 G

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4

A law that states that the polarity of the induced voltage will oppose the change in magnetic flux causing the induction.

A. Joule's law

B. Faraday's law

C. Coulomb's law

D. Lenz' law

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4

What is the unit of magnetomotive force?

A. Volt

B. Tesla

C. Ampere- turn

D. Weber

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4

Paramagnetic substance has a relative permeability of

A. Slightly less than one

B. Equal to one

C. Slightly equal to one

D. Very much greater than one

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4

Cobalt is an example of a ______ material.

A. Paramagnetic

B. Diamagnetic

C. Ferromagnetic

D. Non- magnetic

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4

Hipernik is an alloy containing __________ iron and __________ nickel.

A. 40% ; 60%

B. 60% ; 40%

C. 50% ; 50%

D. 70% ; 30%

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4

A magnetic field is

A. The current flow through space around a permanent magnet

B. The force set up when current flows through a conductor

C. The force that drives current through a resistor

D. The force between the plates of a charged capacitor

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4

Referred to as the specific reluctance of a material

A. Resistivity

B. Reluctivity

C. Conductivity

D. Permeability

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4

The emission of electrons from hot bodies is called

A. Radiation effect

B. Edison effect

C. Skin effect

D. Half effect

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4

The idea of preventing one component from affecting another through their common electric and magnetic field is referred to as

A. Hall effect

B. Grounding

C. Shielding

D. Limiting

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4

The process by which an emf and hence current is generated or induced in a conductor when there is a change in the magnetic flux linking the conductor is called

A. Electromagnetic induction

B. Mutual induction

C. Faraday's law

D. Electromagnetic interference

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4

Whenever a conductor cuts magnetic fluxa an emf is induced in it. This is known as

A. Coulomb's law

B. Joule's law

C. Faraday's law

D. Ohm's law

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4

What is the SI unit of specific resistance or resistivity?

A. Ohm-circular mil per inch

B. Ohm-circular mil per foot

C. Ohm-m

D. Ohm-cm

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4

A law stating that the magnetic susceptibilities of most paramagnetic substances are inversely proportional to their absolute temperatures.

A. Curie's Law

B. Child's Law

C. CR Law

D. Curie-Weiss Law

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4

What is the SI unit of conductance?

A. Siemens

B. Mhos

C. Ohms

D. 1/Ohms

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4

How many electrons are needed in the valence orbit to give a material's stability?

A.

B.

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4

The ability of a mechanically stressed ferromagnetic wire to recognize rapid switching of magnetization when subjected to a dc magnetic field.

A. Wartheim effect

B. Wiedemann effect

C. Wiegand effect

D. Edison effect

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4

Two similar polesa each 1Wba placed 1 m apart in air will experience a repulsive force of

A. 63000 N

B. 63 × 10^-3 N

C. 8 × 10^12 N

D. 796 kN

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4

When the relative permeability of a material is slightly more than 1a it is called ______ material.

A. diamagnetic

B. ferromagnetic

C. paramagnetic

D. non-magnetic

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4

What determines the value of the temperature coefficient of resistance of a material?

A. length

B. cross-sectional area

C. volume

D. nature and temperature

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4

One oersted (Oe) is equivalent to _____ Gb/cm.

A.

B.