Computer Programming MCQs

5739 MCQs  (Page 173 of 574)

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The property of a material which opposes the creation of magnetic flux in it is known as_____________?
A. Reluctivity
B. Magnetomotive force
C. Permeance
D. Reluctance
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Reciprocal of reluctance is_______________?
A. Reluctivity
B. Permeance
C. Permeability
D. Susceptibility
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The unit of reluctance is_____________?
A. Metre/henry
B. Henry/metre
C. Henry
D. 1/henry
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Hysteresis loss least depends on____________?
A. Volume of material
B. Frequency
C. Steinmetz coefficient of material
D. Ambient temperature
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In a magnetic material hysteresis loss takes place primarily due to___________?
A. Rapid reversals of its magnetisation
B. Flux density lagging behind magnetising force
C. Molecular friction
D. It high retentivity
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An air gap is usually inserted in magnetic circuits to____________?
A. Increase m.m.f.
B. Increase the flux
C. Prevent saturation
D. None of the above
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Point out the wrong statement. Magnetic leakage is undesirable in electric machines because it___________?
A. Lowers their power efficiency
B. Increases their cost of manufacture
C. Leads to their increased weight
D. Produces fringing
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The unit of magnetic flux is______________?
A. Henry
B. Weber
C. Ampereturn/weber
D. Ampere/metre
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Permanent magnets are normally made of_____________?
A. Alnico alloys
B. Aluminium
C. Cast iron
D. Wrought iron
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The rate of rise of current through an inductive coil is maximum_____________?
A. At 63.2% of its maximum steady value
B. At the start of the current flow
C. After one time constant
D. Near the final maximum value of current
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Word of the Day
21 Jul
Refrain
stop oneself from doing something.
روکنا، پرہیز کرنا

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