A. high, high
B. low, high
C. high, low
D. low, low
A. low hysteresis loss
B. high permeability
C. low retentivity
D. high retentivity
A material for good magnetic memory should have____________? Read More »
Magnetic Circuit A. zero
B. small
C. large
D. none of the above
A. 50
B. 20
C. 0.05
D. 500
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
The rate of rise of current through an inductive coil is maximum_____________? Read More »
Magnetic Circuit A. alnico alloys
B. aluminium
C. cast iron
D. wrought iron
Permanent magnets are normally made of_____________? Read More »
Magnetic Circuit A. henry
B. weber
C. ampereturn/weber
D. ampere/metre
The unit of magnetic flux is______________? Read More »
Magnetic Circuit A. lowers their power efficiency
B. increases their cost of manufacture
C. leads to their increased weight
D. produces fringing
A. increase m.m.f.
B. increase the flux
C. prevent saturation
D. none of the above
An air gap is usually inserted in magnetic circuits to____________? Read More »
Magnetic Circuit A. rapid reversals of its magnetisation
B. flux density lagging behind magnetising force
C. molecular friction
D. it high retentivity
In a magnetic material hysteresis loss takes place primarily due to___________? Read More »
Magnetic Circuit