Relative permeability of vacuum is__________?

Related Mcqs:

1. 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...

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. The unit of retentivity is____________?

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

5. 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...

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. Reciprocal of reluctance is_______________?

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

8. Hysteresis loss least depends on____________?

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

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. A material for good magnetic memory should have____________?

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