1 |
Mutual induction play role in. |
- A. Generator
- B. D.C. motor
- C. Galvanometer
- D. Transformer
|
2 |
Induced emf in A.C. generator can be increased by |
- A. Decreasing area of coil
- B. Decreasing magnetic field
- C. Increasing area of coil
- D. Slowing down speed of coil
|
3 |
split rings are used in |
- A. A.C. generator
- B. A.C. motor
- C. Transformer
- D. D.C. motor
|
4 |
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
|
5 |
The emf induced by the motion of a conductor across a magnetic field is called: |
- A. Motional emf
- B. Rotational emf
- C. Induced emf
- D. All of above
|
6 |
The jerks in D.C. motor are created by the use of. |
- A. Armature
- B. Commutators
- C. Split rings
- D. Source of emf
|
7 |
When back emf in motor is zero, it draws. |
- A. Zero current
- B. Minimum current
- C. Maximum current
- D. Steady current
|
8 |
Lenz's law was given by Heinrich lenz in: |
- A. 1894
- B. 1904
- C. 1854
- D. 1834
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9 |
Lenz's law deals with |
- A. Magnitude of emf
- B. Direction emf
- C. Direction of induced current
- D. Resistance
|
10 |
If force in the direction of velocity of conductor, then induced current is directed, |
- A. Anti clockwise
- B. Clock wise
- C. At equilibrium
- D. None of above
|