Question: Hysteresis loss least depends on____________?

• 1. volume of material
• 2. frequency
• 3. steinmetz coefficient of material
• 4. ambient temperature

Question: The unit of reluctance is_____________?

• 1. metre/henry
• 2. henry/metre
• 3. henry
• 4. 1/henry

Question: Reciprocal of reluctance is_______________?

• 1. reluctivity
• 2. permeance
• 3. permeability
• 4. susceptibility

Question: The property of a material which opposes the creation of magnetic flux in it is known as_____________?

• 1. reluctivity
• 2. magnetomotive force
• 3. permeance
• 4. reluctance

Question: Silicon steel is used in electrical machines because it has_____________?

• 1. low coercivity
• 2. low retentivity
• 3. low hysteresis loss
• 4. high coercivity

Question: A ferrite core has less eddy current loss than an iron core because_______________?

• 1. ferrites have high resistance
• 2. ferrites are magnetic
• 3. ferrites have low permeability
• 4. ferrites have high hysteresis

Question: Laminated cores, in electrical machines, are used to reduce____________?

• 1. copper loss
• 2. eddy current loss
• 3. hysteresis loss
• 4. all of the above

Question: While comparing magnetic and electric circuits, the flux of magnetic circuit is compared with which parameter of electrical circuit ?

• 1. E.m.f.
• 2. Current
• 3. Current density
• 4. Conductivity

Question: The unit of retentivity is____________?

• 1. weber
• 2. weber/sq. m
• 3. ampere turn/meter
• 4. ampere turn

Question: Conductance is analogous to_____________?

• 1. permeance
• 2. reluctance
• 3. flux
• 4. inductance