McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Uncategorized topics .
Chapters
| 1. |
E.M.F can be induced in a circuit by |
| A. | changing magnetic flux density |
| B. | changing area of circuit |
| C. | changing the angle |
| D. | all of above |
| Answer» D. all of above | |
| 2. |
A straight wire of length 0.20 m moves at a steady speed of {{}} 3.0 m s-1 at right angles to the magnetic field of flux density 0.10 T. The e.m.f induced across ends of wire is |
| A. | 0.5 V |
| B. | 0.06 V |
| C. | 0.05 V |
| D. | 0.04 V |
| Answer» B. 0.06 V | |
| 3. |
By accelerating the magnet inside the coil, the current in it |
| A. | increases |
| B. | decreases |
| C. | remains constant |
| D. | reverses |
| Answer» A. increases | |
| 4. |
Consequence of motor effect is |
| A. | electromagnetic induction |
| B. | current |
| C. | voltage |
| D. | e.m.f |
| Answer» A. electromagnetic induction | |
| 5. |
Total number of magnetic field lines passing through an area is called |
| A. | magnetic flux density |
| B. | magnetic flux |
| C. | e.m.f |
| D. | voltage |
| Answer» B. magnetic flux | |
| 6. |
Magnitude of induced e.m.f is proportional to |
| A. | rate of change of current |
| B. | rate of change of voltage |
| C. | rate of change of magnetic flux linkage |
| D. | rate of change of resistance |
| Answer» C. rate of change of magnetic flux linkage | |
| 7. |
In transformer, the core is made up of soft iron in order to pass the maximum |
| A. | flux |
| B. | current |
| C. | magnetic flux |
| D. | voltage |
| Answer» C. magnetic flux | |
| 8. |
For a straight wire, induced current depends upon |
| A. | the speed of movement of wire |
| B. | the length of wire |
| C. | the magnitude of magnetic flux density |
| D. | all of above |
| Answer» D. all of above | |
| 9. |
In generators, the rate of change of flux linkage is maximum when the coil is moving through the |
| A. | vertical position |
| B. | horizontal position |
| C. | diagonal position |
| D. | at an angle of 45° |
| Answer» B. horizontal position | |
| 10. |
E.M.F for a coil depends upon |
| A. | the cross sectional area |
| B. | no. of turns of wire |
| C. | the magnitude of magnetic flux density |
| D. | all of above |
| Answer» D. all of above | |
| 11. |
Currents that flow in circles inside a disc are known as |
| A. | eddy currents |
| B. | circular currents |
| C. | air currents |
| D. | alternating curents |
| Answer» A. eddy currents | |
| 12. |
When field is parallel to plane of area, magnetic flux through coil is |
| A. | zero |
| B. | infinite |
| C. | 2 |
| D. | 5 |
| Answer» A. zero | |
| 13. |
Moving a coil in and out of magnetic field induces |
| A. | force |
| B. | potential difference |
| C. | e.m.f |
| D. | voltage |
| Answer» C. e.m.f | |
| 14. |
Induced current in coil by a magnet turns it into an |
| A. | straight wire |
| B. | magnet |
| C. | ammeter |
| D. | electromagnet |
| Answer» D. electromagnet | |
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