| 1 |
Eddy current is one cause energy loss in |
- A. A.C. generator
- B. Transformer
- C. D.C. motor
- D. D.C. generator
|
| 2 |
Efficiency of transformer does not affected by |
- A. Input voltage
- B. Core of transformer
- C. Insulation between sheet
- D. Resistance of coils
|
| 3 |
Electric current produces magnetic field, was suggested by. |
- A. Faraday
- B. Oersted
- C. Henry
- D. Lenz
|
| 4 |
The induction can be increased by winding the wire around a core made of. |
- A. Copper
- B. Silicon
- C. Iron
- D. Aluminum
|
| 5 |
The working principle of transformer is. |
- A. Self induction
- B. Faraday's law
- C. Mutual induction
- D. Electromagnetic induction
|
| 6 |
If a step up transformer were 100% efficient the primary and secondary winging's would have the same. |
- A. Current
- B. Power
- C. Voltage
- D. Direction of winding
|
| 7 |
Lenz's law is a consequence of the law of conservation of |
- A. Charge
- B. Momentum
- C. Energy
- D. Angular momentum
|
| 8 |
If magnetic field is doubled then magnetic energy density becomes. |
- A. Four times
- B. Two times
- C. Three times
- D. Six times
|
| 9 |
If D.C. input for step up transformer, the output is |
- A. Zero
- B. High
- C. Low
- D. May be high or low
|
| 10 |
The Lenz's law fulfils. |
- A. Law of conservation of energy
- B. Law of conservation of charge
- C. Law of conservation of momentum
- D. Kirchhoff's law
|
