A material for good magnetic memory should have____________?

Related Mcqs:

1. 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...

2. 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...

3. 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...

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

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

6. An air gap is usually inserted in magnetic circuits to____________?

   A. increase m.m.f. B. increase the flux C. prevent saturation D. none of the above...

7. 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...

8. 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...

9. The unit of magnetic flux is______________?

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

10. The relative permeability of a ferromagnetic material is_____________?

    A. less than one B. more than one C. more than 10 D. more than 100 or 1000...