Related Questions
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4
Flux linkages equals
A. Flux times area of core
B. Flux times number of turns times area of core
C. Flux times number of turns times length of core
D. Flux times number of turns
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4
Hipernik is an alloy containing __________ iron and __________ nickel.
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4
All matters (gasa liquid and solid) are composed of
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4
Which of the following statements is TRUE?
A. Silicon dioxide is a good
B. The current carriers in conductors are valence electrons
C. For conductorsa the valence electron are strongly attracted to the nucleus
D. The valence electrons are located in the nucleus of an atom
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4
One ampere- turn is equivalent to _____ gilberts
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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
The reluctance of a magnetic circuit varies with
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4
Which of the following materials has the least hysteresis loop area?
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Back emf refers to the
A. Current equal to the applied emf
C. Current opposing the applied emf
D. Voltage opposing the applied emf
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4
Whenever a conductor cuts magnetic fluxa an emf is induced in it. This is known as
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4
What bond is formed when electrons in the outermost energy orbits of the atoms are shared between two or more electrons?
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4
Which of the following magnetic materials can be easily magnetized in both direction?
A. Soft magnetic materials
B. Hard magnetic materials
C. High hysteresis loss materials
D. Low hysteresis loss materials
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4
When the relative permeability of a material is slightly less than 1a it is called _____ material.
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4
The total number of magnetic lines of force in a magnetic field is called
C. Magnetic flux intensity
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It is the reciprocal of reluctance and implies the case of readiness with which magnetic flux is developed.
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4
What is the typical saturation flux density for most magnetic materials?
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4
The temperature coefficient of resistance of semiconductors is
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4
What is the reluctance of a magnetic path having a length of 2x 10^-3m and crosssectional area of 2.5 x 10^-3 m^2?
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4
A 200-watt lamp working for 24 hours will consume approximately _____ units.
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4
The permittivity of a material is given by one of the following formulas.
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4
Magnetic effects of the earth as a huge magnet with north and south poles.
D. Terrestrial ferromagnetism
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4
Small voltages generated by a conductor with current in an external magnetic field.
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4
The K shell or the first shell has how many permissible number of orbiting electrons?
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4
The net electrical charge in an isolated system remains constant. This is known as
A. Law of conservation of charge
D. Law of conservation of energy
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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
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4
The current of electric circuit is analogous to which quantity of a m
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4
Which of the following is a diamagnetic material?
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4
Electromotive force in a circuit
A. causes free electrons to flow
B. increases the circuit resistance
C. maintains circuit resistance
D. is needed to make the circuit complete
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4
______ is an electromagnet with its core in the form of a close magnetic ring.
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If a magnetic flux cuts across 200 turns at a rate of 2Wb/sa the induced voltage according to Faraday's law is about