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4

The temperature coefficient of resistance of eureka is

A. p ositive

B. negative

C. almost zero

D. i nfinite

Correct Answer :

C. almost zero


Related Questions

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4

What is the typical saturation flux density for most magnetic materials?

A. 4 Wb/m^2

B. 5 Wb/m^2

C. 1 Wb/m^2

D. 2 Wb/m^2

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4

The property of magnetic materials of retaining magnetism after withdrawal of the magnetizing force is known as

A. Retentivity

B. Reluctivity

C. Resistivity

D. Conductivity

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4

What is the practical unit of electrical energy?

A. Watt

B. Kilowatt-hour

C. Kilowatt-second

D. Megawathour

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4

The B-H curve for ________ is a straight line passing through the origin.

A. cobalt

B. air

C. hardened steel

D. soft iron

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The phenomenon by which a subtracts pieces of iron

A. Magnetism

B. Electromagnetism

C. Naturalism

D. Materialism

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The science of adapting electronics to aerospace flight.

A. Avionics

B. Aerotronics

C. Aerodynamics

D. Astrionics

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What is the diameter of an atom?

A. About 10^-10 m

B. About 10^-10 cm

C. About 10^-10 mm

D. About 10^-10 �m

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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

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Residual magnetism refers to the flux densitya which exists in the iron core when the magnetic field intensity is

A. Minimized

B. Reduced to zero

C. Maximize

D. Unity

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4

If the right handed bottle-opener cork screw is assumed to be along the conductor so as to advance in the direction of current flow, the motion of its handle will indicate the direction of magnetic flux produced around the conductor. This is known as

A. Right hand rule

B. Left hand rule

C. Cork screw rule

D. End rule

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

A. Permeance

B. Eddy current

C. Hysteresis

D. R eluctance

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If the number of valence electrons of an atom is more than 4a the substance is called

A. a semiconductor

B. a conductor

C. an insulator

D. a semi-insulator

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4

The core of a transformer heats up when its primary is fed from an ac source because of

A. permeability

B. ferromagnetism

C. reluctance of core

D. hysteresis loss

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4

What is the value of the absolute permittivity of air?

A. 8.854 F/m

B. 8.854 × 10^-12 mF/m

C. 8.854× 10^-12 F/m

D. 8.854 × 10^-12 F/m

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4

An electron- volt (eV) is a unit of

A. Energy

B. Potential difference

C. Charge

D. Momentum

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

A. equal to

B. about 1837 times

C. less than

D. 200 tim es

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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

Which of the following electric quantities is vector in character?

A. Field

B. Charge

C. Energy

D. Potential Difference

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4

What principle states that each electron in an atom must have a different set of quantum numbers?

A. Inclusion principle

B. Exclusion principle

C. Quantum principle

D. Electron principle

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4

Which of the following has the highest permeability?

A. Soft iron

B. Steel

C. Air

D. Permalloy

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What is the unit of reluctance?

A. Maxwell

B. Gauss

C. At/Wb

D. Weber

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Magnetic intensity is a

A. Phasor quantity

B. Physical quantity

C. Scalar quantity

D. Vector quantity

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The greater percentage of materials is _________.

A. diamagnetic

B. paramagnetic

C. ferromagnetic

D. non-magnetic

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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

If the value of 25 of a conductor is 1/230 per oCa then the value of 0is

A. 1/180 peroC

B. 1/150 per oC

C. 1/280 per oC

D. 1/230 per oC

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4

Germanium atom has ______ protons and ______ electrons.

A. 32, 32

B. 32, 42

C. 42, 32

D. 34, 34

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The uncharged particles which have no effect on its atomic charge.

A. Nucleons

B. Electrons

C. Protons

D. Neutrons

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The temperature coefficient of resistance of conductors is

A. positive

B. zero

C. negative

D. infinite

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4

States that the ratio of the thermal conductivity is proportional to the absolute temperature for all metals.

A. Wien's displacement law

B. Hartleys law

C. Hall's law

D. Wiedemann Franz law

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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