Permanent magnets are normally made of? Mark as favorite Copy Link alnico alloys aluminium cast iron wrought iron Check Answer
Those magnetic materials are best suited for making armature and transformer cores which have .. . . . . permeability and ……… hystersis loss? Mark as favorite Copy Link high, high low, high high, low low, low Check Answer
The relative permeability of a ferromagnetic material is? Mark as favorite Copy Link less than one more than one more than 10 more than 100 or 1000 Check Answer
In a magnetic material hysteresis loss takes place primarily due to? Mark as favorite Copy Link rapid reversals of its magnetisation flux density lagging behind magnetising force molecular friction it high retentivity Check Answer
Hard steel is suitable for making permanent magnets because? Mark as favorite Copy Link it has good residual magnetism its hysteresis loop has large area its mechanical strength is high its mechanical strength is low Check Answer
The property of a material which opposes the creation of magnetic flux in it is known as? Mark as favorite Copy Link reluctivity magnetomotive force permeance reluctance Check Answer
Point out the wrong statement. Magnetic leakage is undesirable in electric machines because it? Mark as favorite Copy Link lowers their power efficiency increases their cost of manufacture leads to their increased weight produces fringing Check Answer
Hysteresis loss least depends on? Mark as favorite Copy Link volume of material frequency steinmetz coefficient of material ambient temperature Check Answer
Those materials are well suited for making permanent magnets which have retentivity and coercivity? Mark as favorite Copy Link low, high high, high high, low low, low Check Answer
Conductivity is analogous to? Mark as favorite Copy Link retentivity resistivity permeability inductance Check Answer