The rate of rise of current through an inductive coil is maximum After one time constant At the start of the current flow Near the final maximum value of current At 63.2% of its maximum steady value TRUE ANSWER : ? YOUR ANSWER : ?
A material for good magnetic memory should have High retentivity High permeability Low hysteresis loss Low retentivity TRUE ANSWER : ? YOUR ANSWER : ?
Reciprocal of reluctance is Susceptibility Reluctivity Permeability Permeance TRUE ANSWER : ? YOUR ANSWER : ?
Energy stored by a coil is doubled when its current is increased by percent. 44.6 47.5 41.4 42.5 TRUE ANSWER : ? YOUR ANSWER : ?
The property of a material which opposes the creation of magnetic flux in it is known as Reluctance Magneto-motive force Permeance Reluctivity TRUE ANSWER : ? YOUR ANSWER : ?
Those magnetic materials are best suited for making armature and transformer cores which have ________permeability and _________hysteresis loss. Low, low High, low Low, high High, high TRUE ANSWER : ? YOUR ANSWER : ?
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 : ?
Those materials are well suited for making permanent magnets which have ________ retentivity and ________ coercivity. Low, high High, high Low, low High, low TRUE ANSWER : ? YOUR ANSWER : ?