| 1 |
Lenz's law presented in |
- A. 1834
- B. 1934
- C. 1826
- D. 1836
|
| 2 |
Electric current produces magnetic field, was suggested by. |
- A. Faraday
- B. Oersted
- C. Henry
- D. Lenz
|
| 3 |
Which of the following converts electrical energy into mechanical energy. |
- A. Transformer
- B. A.C. generator
- C. D.C. generator
- D. D.C. motor
|
| 4 |
When the back emf is zero, its draws. |
- A. Zero current
- B. Minimum current
- C. Maximum current
- D. Steady current
|
| 5 |
Unit of self inductance is |
- A. Weber
- B. Tesla
- C. Henry
- D. Farad
|
| 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 |
The illustration of the phenomenon of mutual induction is in the device of |
- A. Transformer
- B. Inductor
- C. A.C. Generator
- D. Ammeter
|
| 8 |
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
|
| 9 |
Step up transfer has a transformation ratio of 3:2. What is the voltage in secondary , If voltage in primary is 30 V? |
- A. 45 V
- B. 15 V
- C. 90 V
- D. 300 V
|
| 10 |
If speed of rotation of a generator is doubled the output voltage will be. |
- A. Remain same
- B. Double
- C. Four time
- D. One half
|