The unit of retentivity is____________?

Related Mcqs:

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

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

2. The unit of reluctance is_____________?

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

3. The unit of magnetic flux is______________?

   A. henry B. weber C. ampereturn/weber D. ampere/metre...

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

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

5. Relative permeability of vacuum is__________?

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

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

   A. E.m.f. B. Current C. Current density D. Conductivity...

7. Laminated cores, in electrical machines, are used to reduce____________?

   A. copper loss B. eddy current loss C. hysteresis loss D. all of the above...

8. Reciprocal of reluctance is_______________?

   A. reluctivity B. permeance C. permeability D. susceptibility...

9. 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...

10. Permanent magnets are normally made of_____________?

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