Which of the fpllowing inductor will have the least eddy current losses ?

Related Mcqs:

1. A laminated iron core has reduced eddy-current losses because____________?

   A. more wire can be used with less D.C. resistance in coil
   B. the laminations are insulated from each other
   C. the magnetic flux is concentrated in the air gap of the core
   D. the laminations are stacked vertfcally

2. A crack in the magnetic path of an inductor will result in________________?

   A. unchanged inductance
   B. increased inductance
   C. zero inductance
   D. reduced inductance

3. The property of coil by which a counter e.m.f. is induced in it when the current through the coil changes is known as__________?

   A. self-inductance
   B. mutual inductance
   C. series aiding inductance
   D. capacitance

4. If current in a conductor increases then according to Lenz’s law self-induced voltage will____________?

   A. aid the increasing current
   B. tend to decrease the amount of cur-rent
   C. produce current opposite to the in-creasing current
   D. aid the applied voltage

5. An e.m.f. of 16 volts is induced in a coil of inductance 4H. The rate of change of current must be______________?

   A. 64 A/s
   B. 32 A/s
   C. 16 A/s
   D. 4 A/s

6. In case all the flux from the current in coil 1 links with coil 2, the co-efficient of coupling will be____________?

   A. 2.0
   B. 1.0
   C. 0.5
   D. zero

7. A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by________________?

   A. variation in coil current
   B. variation in voltage to the coil
   C. change of number of turns of coil
   D. the resistance of magnetic path

8. Current produced by moving the loop of wire across a magnetic field is called_____________?

   A. A.C current
   B. D.C current
   C. induced current
   D. mean square current

9. An alternating current or voltage________________?

   A. fluctuates off and on
   B. varies in magnitude alone
   C. changes its direction again and again
   D. changes its magnitude continuously and reverses its direction of flow after regularly recurring intervals.

10. The alternating current has frequency of 106 Hz in such a way that time period for completion of cycle is_______________?

    A. 1Hzs
    B. 1.5Hzs
    C. 106sec
    D. 1sec