| 1 |
When motor is just started, back emf is almost. |
- A. Maximum
- B. Zero
- C. Minimum
- D. Infinite
|
| 2 |
If D.C. input for step up transformer, the output is |
- A. Zero
- B. High
- C. Low
- D. May be high or low
|
| 3 |
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
|
| 4 |
Mutual induction has a practical role in the performance of the. |
- A. Radio choke
- B. Transformers
- C. A.C. Generator
- D. D.C. Generator
|
| 5 |
split rings are used in |
- A. A.C. generator
- B. A.C. motor
- C. Transformer
- D. D.C. motor
|
| 6 |
When a conductor moves across a magnetic field an emf is set up this emf is called. |
- A. Variable emf
- B. Constant emf
- C. Back emf
- D. Induced emf
|
| 7 |
The Direction of induced current is always so as to oppose the change which causes the current, is: |
- A. Faraday's law
- B. Lenz's law
- C. Ohm's law
- D. Kirchhoff' s1ast rule
|
| 8 |
The self induction emf is some times called. |
- A. Motional emf
- B. Constant emf
- C. Back emf
- D. Variable emf
|
| 9 |
Energy stored in an inductor is: |
- A. 1/2L<sup>2</sup>I
- B. 1/2L<sup>2</sup>/I
- C. <sub>1/2LI</sub><sup>2</sup>
- D. 1/2LI
|
| 10 |
The Si unit of Mutual inductance is: |
- A. VA<sup>-1</sup>S<sup>-1</sup>
- B. VAS<sup>-1</sup>
- C. VSA<sup>-1</sup>
- D. ASV<sup>-1</sup>
|