In a magnetic material hysteresis loss takes place primarily due to Flux density lagging behind magnetizing force It high retentivity Molecular friction Rapid reversals of its magnetization TRUE ANSWER : ? YOUR ANSWER : ?
The unit of retentivity is Weber/sq. m Ampere turn/meter Weber Ampere turns TRUE ANSWER : ? YOUR ANSWER : ?
Silicon steel is used in electrical machines because it has Low retentivity Low hysteresis loss High coercivity Low coercivity TRUE ANSWER : ? YOUR ANSWER : ?
Energy stored by a coil is doubled when its current is increased by percent. 41.4 47.5 42.5 44.6 TRUE ANSWER : ? YOUR ANSWER : ?
While comparing magnetic and electric circuits, the flux of magnetic circuit is compared with which parameter of electrical circuit? Conductivity E.M.F Current density Current TRUE ANSWER : ? YOUR ANSWER : ?
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 20 500 50 70 TRUE ANSWER : ? YOUR ANSWER : ?
If the area of hysteresis loop of a material is large, the hysteresis loss in this material will be None of the listed here Zero Large Small TRUE ANSWER : ? YOUR ANSWER : ?
Laminated cores, in electrical machines, are used to reduce Copper loss Hysteresis loss Eddy current loss All of the listed here TRUE ANSWER : ? YOUR ANSWER : ?
Permeability in a magnetic circuit corresponds to_________ in an electric circuit. Conductance Conductivity Resistance Resistivity TRUE ANSWER : ? YOUR ANSWER : ?