Hard steel is suitable for making permanent magnets because_____________?

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. Permanent magnets are normally made of_____________?

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

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

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

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

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

6. Relative permeability of vacuum is__________?

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

7. 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...

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. The unit of magnetic flux is______________?

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