Reciprocal of reluctance is Reluctivity Permeance Susceptibility Permeability TRUE ANSWER : ? YOUR ANSWER : ?
While comparing magnetic and electric circuits, the flux of magnetic circuit is compared with which parameter of electrical circuit? E.M.F Current density Current Conductivity TRUE ANSWER : ? YOUR ANSWER : ?
Permeability in a magnetic circuit corresponds to_________ in an electric circuit. Conductivity Conductance Resistance Resistivity TRUE ANSWER : ? YOUR ANSWER : ?
Energy stored by a coil is doubled when its current is increased by percent. 44.6 41.4 47.5 42.5 TRUE ANSWER : ? YOUR ANSWER : ?
In a magnetic material hysteresis loss takes place primarily due to Molecular friction Rapid reversals of its magnetization Flux density lagging behind magnetizing force It high retentivity TRUE ANSWER : ? YOUR ANSWER : ?
An air gap is usually inserted in magnetic circuits to None of the listed here Prevent saturation Increase the flux Increase m.m.f. TRUE ANSWER : ? YOUR ANSWER : ?
Conductivity is analogous to Permeability Inductance Resistivity Retentivity TRUE ANSWER : ? YOUR ANSWER : ?
Silicon steel is used in electrical machines because it has Low coercivity High coercivity Low retentivity Low hysteresis loss TRUE ANSWER : ? YOUR ANSWER : ?
The unit of magnetic flux is Ampere/metre Ampere-turn/weber Weber Henry TRUE ANSWER : ? YOUR ANSWER : ?
When both the inductance and resistance of a coil are doubled the value of Time constant remains unchanged Initial rate of rise of current is doubled Time constant is halved Final steady current is doubled TRUE ANSWER : ? YOUR ANSWER : ?