| 1 |
Unit of self inductance is |
- A. Weber
- B. Tesla
- C. Henry
- D. Farad
|
| 2 |
By winding the coil around a less magnetic core, self induction. |
- A. Will increase
- B. Will decrease
- C. Remain same
- D. First increase then decrease
|
| 3 |
A.C. Generator based upon the |
- A. Lenz's law
- B. Maxwell's relation
- C. Faradays law of electromagnet induction
- D. Mutual induction
|
| 4 |
In A.C. generator , when plane of coil is perpendicular to magnetic field, then output of generator is. |
- A. NwAB
- B. 2pi f
- C. Maximum
- D. Zero
|
| 5 |
Step up transformer is used. |
- A. Step up D.C. voltage
- B. Step up A.C. voltage
- C. Step up both A.C and D.C.
- D. Step up A.C. current
|
| 6 |
SI unit of hennery which is. |
- A. VSA-1
- B. VS-1 A
- C. VS-1A-1
- D. VSA
|
| 7 |
The magnitude of motional emf is given by |
|
| 8 |
Eddy current is produced when: |
- A. A metal is light in varying magnetic field
- B. A metal is kept in steady magnetic field
- C. A circular coil is placed in a steady magnetic field
- D. A current is passed through a circualr coil
|
| 9 |
With the speed of motor, magnitude of back emf |
- A. Remain same
- B. Increase
- C. Decrease
- D. First increases then decreases
|
| 10 |
The direction of induced current is always so as to oppose the change which causes the current, this is the statement of |
- A. Lenz's law
- B. Faraday's law
- C. Ampere's law
- D. Coulomb's law
|