McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Uncategorized topics .
Chapters
| 1. |
If a secondary coil has 40 turns, and, a primary coil with 20 turns is charged with 50 V of potential difference, then the potential difference in the secondary coil would be |
| A. | 50 V in secondary coil |
| B. | 25 V in secondary coil |
| C. | 60 V in secondary coil |
| D. | 100 V in secondary coil |
| Answer» D. 100 V in secondary coil | |
| 2. |
Generators at a power station produce electric power at voltage |
| A. | 45 kW |
| B. | 50 kW |
| C. | 60 kW |
| D. | 25 kW |
| Answer» D. 25 kW | |
| 3. |
Equation which measures alternating voltage is |
| A. | Vsin ω |
| B. | sin t |
| C. | Vo sinωt |
| D. | V=IR |
| Answer» C. Vo sinωt | |
| 4. |
In transformer, alternating current is induced in |
| A. | primary coil |
| B. | secondary coil |
| C. | iron core |
| D. | resistor |
| Answer» B. secondary coil | |
| 5. |
High voltages lead to |
| A. | less power loss |
| B. | more power loss |
| C. | high current |
| D. | high resistance |
| Answer» A. less power loss | |
| 6. |
Graph of alternating current is a |
| A. | cos wave |
| B. | tan wave |
| C. | curve |
| D. | sine wave |
| Answer» D. sine wave | |
| 7. |
A component that allows only unidirectional current to pass through it is |
| A. | resistor |
| B. | inductor |
| C. | transformer |
| D. | diode |
| Answer» D. diode | |
| 8. |
Average power dissipated in resistor if sinusoidal p.d of peak value 25V is connected across a 20 Ω resistor is |
| A. | 15.6 W |
| B. | 15 W |
| C. | 16 W |
| D. | 17 W |
| Answer» A. 15.6 W | |
| 9. |
Amount of d.c voltage as compare to Vo is |
| A. | 50% |
| B. | 60% |
| C. | 70% |
| D. | 80% |
| Answer» C. 70% | |
| 10. |
A well designed transformer loses power under |
| A. | 10% |
| B. | 1.20% |
| C. | 0.1% |
| D. | 20% |
| Answer» C. 0.1% | |
| 11. |
Ratio of voltages is equal to ratio of |
| A. | iron sheets in core |
| B. | coil |
| C. | number of turns in coil |
| D. | all of above |
| Answer» C. number of turns in coil | |
| 12. |
Process in which A.C is converted into D.C is called |
| A. | induction |
| B. | rectification |
| C. | inversion |
| D. | dispersion |
| Answer» B. rectification | |
| 13. |
Steady d.c voltage is also known as |
| A. | square velocity |
| B. | root mean square velocity |
| C. | root velocity |
| D. | velocity |
| Answer» B. root mean square velocity | |
| 14. |
Ratio of voltages is inverse ratio of the |
| A. | transformer |
| B. | resistor |
| C. | iron core |
| D. | current |
| Answer» D. current | |
| 15. |
If output voltage is greater than input voltage, then transformer is |
| A. | step up |
| B. | step down |
| C. | faulty |
| D. | fatal |
| Answer» A. step up | |
| 16. |
Highest point on AC graph is known as |
| A. | peak value |
| B. | amplitude |
| C. | frequency |
| D. | wave front |
| Answer» A. peak value | |
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