A. high, high
B. low, high
C. high, low
D. low, low
0
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A material for good magnetic memory should have____________?
0
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If the area of hysteresis loop of a material is large, the hysteresis loss in this material will be____________?
A. low hysteresis loss
B. high permeability
C. low retentivity
D. high retentivity
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The initial rate of rise of current through a coil of inductance 10 H when suddenly connected to a D.C. supply of 200 V is__________Vs
A. zero
B. small
C. large
D. none of the above
0
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The rate of rise of current through an inductive coil is maximum_____________?
A. 50
B. 20
C. 0.05
D. 500
0
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Permanent magnets are normally made of_____________?
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
0
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The unit of magnetic flux is______________?
A. alnico alloys
B. aluminium
C. cast iron
D. wrought iron
0
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Point out the wrong statement. Magnetic leakage is undesirable in electric machines because it___________?
A. henry
B. weber
C. ampereturn/weber
D. ampere/metre
0
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An air gap is usually inserted in magnetic circuits to____________?
A. lowers their power efficiency
B. increases their cost of manufacture
C. leads to their increased weight
D. produces fringing
0
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In a magnetic material hysteresis loss takes place primarily due to___________?
A. increase m.m.f.
B. increase the flux
C. prevent saturation
D. none of the above