| 1 |
Mutual induction has a practical role in the performance of the. |
- A. Radio choke
- B. Transformers
- C. A.C. Generator
- D. D.C. Generator
|
| 2 |
The device in which induced emf is statically induced emf is: |
- A. Transforms
- B. AC generator
- C. Alevator
- D. Dynamo
|
| 3 |
EMF is induced due to change in |
- A. Charge
- B. Current
- C. Magnetic flux
- D. Electric field
|
| 4 |
Lenz's law is a consequence of the law of conservation of |
- A. Charge
- B. Momentum
- C. Energy
- D. Angular momentum
|
| 5 |
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
|
| 6 |
The motional emf depends upon the |
- A. Length of conductor
- B. Speed of conductor
- C. Strength of magnet
- D. All of these
|
| 7 |
A.C. Generator based upon the |
- A. Lenz's law
- B. Maxwell's relation
- C. Faradays law of electromagnet induction
- D. Mutual induction
|
| 8 |
If we make magnetic field stronger the value of induced current is. |
- A. Decreased
- B. Increased
- C. Vanishes
- D. Remain constant
|
| 9 |
When back emf in motor is zero, it draws. |
- A. Zero current
- B. Minimum current
- C. Maximum current
- D. Steady current
|
| 10 |
Which of the following quantities remain constant in step up transformer? |
- A. Current
- B. Voltage
- C. Power
- D. Heat
|