| 1 |
For step down transformer |
- A. Ns>Np
- B. Np > Ns
- C. Ns = Np
- D. Ns > > > Np
|
| 2 |
The Lenz's law is also statement of: |
- A. Law of conservation of mass
- B. Law of conservation of charge
- C. Law of conservation of energy
- D. Law of conservation of momentum
|
| 3 |
Which one is not present in A.C. generator. |
- A. Armature
- B. Magnet
- C. Slip rings
- D. Commutator
|
| 4 |
A step up transformer is used 120 V line to provide 240 V. If primary coil has 100 turns the number of turns is secondary is. |
- A. 50
- B. 100
- C. 150
- D. 200
|
| 5 |
Energy density in an inductor is. |
- A. Directly proportional to magnetic field
- B. Directly proportional to square of magnetic field
- C. Inversely proportional to magnetic field
- D. Inversely proportional to square of magnetic field
|
| 6 |
Unit of self inductance is |
- A. Weber
- B. Tesla
- C. Henry
- D. Farad
|
| 7 |
The movement of conductor in magnetic field produces electrical current was discovered in: |
- A. 1931
- B. 1731
- C. 1842
- D. 1831
|
| 8 |
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
|
| 9 |
Eddy current is one cause energy loss in |
- A. A.C. generator
- B. Transformer
- C. D.C. motor
- D. D.C. generator
|
| 10 |
In A.C. inductor behaves as |
- A. Capacitor
- B. Resistor
- C. Commutator
- D. Transistor
|
