Those materials are well suited for making permanent magnets which have ________ retentivity and _________ coercivity

Related Mcqs:

1. 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...

2. Hard steel is suitable for making permanent magnets because_____________?

   A. it has good residual magnetism B. its hysteresis loop has large area C. its mechanical strength is high D. its mechanical strength is low...

3. Permanent magnets are normally made of_____________?

   A. alnico alloys B. aluminium C. cast iron D. wrought iron...

4. The unit of retentivity is____________?

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

5. Conductivity is analogous to____________?

   A. retentivity B. resistivity C. permeability D. inductance...

6. A ferrite core has less eddy current loss than an iron core because_______________?

   A. ferrites have high resistance B. ferrites are magnetic C. ferrites have low permeability D. ferrites have high hysteresis...

7. Silicon steel is used in electrical machines because it has_____________?

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

8. Hysteresis loss least depends on____________?

   A. volume of material B. frequency C. steinmetz coefficient of material D. ambient temperature...

9. The initial rate of rise of current through a coil of inductance 10 H when suddenly connected to a D.C. supply of 200 V is__________Vs

   A. 50 B. 20 C. 0.05 D. 500...

10. 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...