The relative permeability of a ferromagnetic material is_____________?

Related Mcqs:

1. Relative permeability of vacuum is__________?

   A. 1 B. 1 H/m C. 1/4JI D. 4n x 10-‘ H/m...

2. Permeability in a magnetic circuit corresponds to________ in an electric circuit

   A. resistance B. resistivity C. conductivity D. conductance...

3. Those magnetic materials are best suited for making armature and transformer cores which have ________ permeability and ________ hystersis loss

   A. high, high B. low, high C. high, low D. low, low...

4. If the area of hysteresis loop of a material is large, the hysteresis loss in this material will be____________?

   A. zero B. small C. large D. none of the above...

5. The unit of reluctance is_____________?

   A. metre/henry B. henry/metre C. henry D. 1/henry...

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

   A. reluctivity B. magnetomotive force C. permeance D. reluctance...

7. In a magnetic material hysteresis loss takes place primarily due to___________?

   A. rapid reversals of its magnetisation B. flux density lagging behind magnetising force C. molecular friction D. it high retentivity...

8. A material for good magnetic memory should have____________?

   A. low hysteresis loss B. high permeability C. low retentivity D. high retentivity...

9. The unit of retentivity is____________?

   A. weber B. weber/sq. m C. ampere turn/meter D. ampere turn...

10. Point out the wrong statement. Magnetic leakage is undesirable in electric machines because it___________?

    A. lowers their power efficiency B. increases their cost of manufacture C. leads to their increased weight D. produces fringing...