| 1 |
The movement of conductor in magnetic field produces electrical current was discovered in: |
- A. 1931
- B. 1731
- C. 1842
- D. 1831
|
| 2 |
The rod of unit length is moving at 30 o through a magnetic field of 1 T. If the velocity of rod is 1 m/s, then induced emf in the rod will be given by |
- A. I V
- B. 0.25 V
- C. 0.5 V
- D. 0.6 V
|
| 3 |
When back emf in motor is zero, it draws. |
- A. Zero current
- B. Minimum current
- C. Maximum current
- D. Steady current
|
| 4 |
In self induction A coil is connected in__________ with battery and a rheostat. |
- A. Parallel
- B. Series
- C. Both A and B
- D. None of above
|
| 5 |
Mutual induction has a practical role in the performance of the. |
- A. Radio choke
- B. Transformers
- C. A.C. Generator
- D. D.C. Generator
|
| 6 |
One henry is equal to |
- A. 1 ohm x 1 sec
- B. 1 ohm x 1 hertz
- C. 1 ohm x 1 metre
- D. All of above
|
| 7 |
If the north pole of a magnet moves away from a metallic ring |
- A. Clockwise
- B. Anticlockwise
- C. First clockwise and then anticlockwise
- D. None of above
|
| 8 |
Self induction does not depend on |
- A. Number of turns of the coil
- B. Area of cross section of the core
- C. Nature of material of the core
- D. Current through inductor
|
| 9 |
Commutator was invented by: |
- A. William bills
- B. William Gates
- C. William tells
- D. William Sturgeon
|
| 10 |
In A.C. inductor behaves as |
- A. Capacitor
- B. Resistor
- C. Commutator
- D. Transistor
|