MCQOPTIONS
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MCQOPTIONS
This section includes 46 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A 33 half-watt resistor and a 330 half-watt resistor are connected across a 12 V source. Which one(s) will overheat? |
| A. | 33 |
| B. | 330 |
| C. | both resistors |
| D. | neither resistor |
| Answer» E. | |
| 2. |
A 220 resistor dissipates 3 W. The voltage is |
| A. | 73.3 V |
| B. | 2.5 V |
| C. | 25.7 V |
| D. | 257 V |
| Answer» D. 257 V | |
| 3. |
A 3.3 k resistor dissipates 0.25 W. The current is |
| A. | 8.7 mA |
| B. | 87 mA |
| C. | 8.7 µA |
| D. | 8.7 A |
| Answer» B. 87 mA | |
| 4. |
A 15 V source is connected across a 12 resistor. How much energy is used in three minutes? |
| A. | 938 Wh |
| B. | 0.938 Wh |
| C. | 56.25 Wh |
| D. | 5.6 Wh |
| Answer» C. 56.25 Wh | |
| 5. |
A 120 resistor must carry a maximum current of 25 mA. Its rating should be at least |
| A. | 4.8 W |
| B. | 150 mW |
| C. | 15 mW |
| D. | 480 mW |
| Answer» C. 15 mW | |
| 6. |
A 75 load uses 2 W of power. The output voltage of the power supply is approximately |
| A. | 120 V |
| B. | 1.2 V |
| C. | 12 V |
| D. | 6 V |
| Answer» D. 6 V | |
| 7. |
When the current through a 12 k resistor is 8 mA, the power is |
| A. | 7.68 mW |
| B. | 768 mW |
| C. | 7.68 W |
| D. | 76.8 W |
| Answer» C. 7.68 W | |
| 8. |
A 6 V battery is connected to a 300 load. Under these conditions, it is rated at 40 Ah. How long can it supply current to the load? |
| A. | 1 h |
| B. | 200 h |
| C. | 2,000 h |
| D. | 10 h |
| Answer» D. 10 h | |
| 9. |
A 68 resistor is connected across the terminals of a 3 V battery. The power dissipation of the resistor is |
| A. | 132 mW |
| B. | 13.2 mW |
| C. | 22.6 mW |
| D. | 226 mW |
| Answer» B. 13.2 mW | |
| 10. |
A 75 load uses 2 W of power. The output voltage of the power supply is approximately |
| A. | 120 V |
| B. | 1.2 V |
| C. | 12 V |
| D. | 6 V |
| Answer» D. 6 V | |
| 11. |
A 68 resistor is connected across the terminals of a 3 V battery. The power dissipation of the resistor is |
| A. | 132 mW |
| B. | 13.2 mW |
| C. | 22.6 mW |
| D. | 226 mW |
| Answer» B. 13.2 mW | |
| 12. |
Power rating is related to resistance value. |
| A. | rue |
| B. | alse |
| Answer» C. | |
| 13. |
A resistor normally opens when it burns out. |
| A. | rue |
| B. | alse |
| Answer» B. alse | |
| 14. |
The watt is the unit of power. |
| A. | rue |
| B. | alse |
| Answer» B. alse | |
| 15. |
When the current through a 12 kΩ resistor is 8 mA, the power is |
| A. | .68 mW |
| B. | 68 mW |
| C. | .68 W |
| D. | 6.8 W |
| Answer» C. .68 W | |
| 16. |
A 75 Ω load uses 2 W of power. The output voltage of the power supply is approximately |
| A. | 20 V |
| B. | .2 V |
| C. | 2 V |
| D. | V |
| Answer» D. V | |
| 17. |
A battery is one type of power supply that converts chemical energy into electrical energy. |
| A. | rue |
| B. | alse |
| Answer» B. alse | |
| 18. |
A 33 Ω half-watt resistor and a 330 Ω half-watt resistor are connected across a 12 V source. Which one(s) will overheat? |
| A. | 3 Ω |
| B. | 30 Ω |
| C. | oth resistors |
| D. | either resistor |
| Answer» E. | |
| 19. |
A 68 Ω resistor is connected across the terminals of a 3 V battery. The power dissipation of the resistor is |
| A. | 32 mW |
| B. | 3.2 mW |
| C. | 2.6 mW |
| D. | 26 mW |
| Answer» B. 3.2 mW | |
| 20. |
A 120 Ω resistor must carry a maximum current of 25 mA. Its rating should be at least |
| A. | .8 W |
| B. | 50 mW |
| C. | 5 mW |
| D. | 80 mW |
| Answer» C. 5 mW | |
| 21. |
A 15 V source is connected across a 12 Ω resistor. How much energy is used in three minutes? |
| A. | 38 Wh |
| B. | .938 Wh |
| C. | 6.25 Wh |
| D. | .6 Wh |
| Answer» C. 6.25 Wh | |
| 22. |
The capacity of a battery is measured in milli-amperes. |
| A. | rue |
| B. | alse |
| Answer» C. | |
| 23. |
A 6 V battery is connected to a 300 Ω load. Under these conditions, it is rated at 40 Ah. How long can it supply current to the load? |
| A. | h |
| B. | 00 h |
| C. | ,000 h |
| D. | 0 h |
| Answer» D. 0 h | |
| 24. |
Energy equals power multiplied by time. |
| A. | rue |
| B. | alse |
| Answer» B. alse | |
| 25. |
A 220 Ω resistor dissipates 3 W. The voltage is |
| A. | 3.3 V |
| B. | .5 V |
| C. | 5.7 V |
| D. | 57 V |
| Answer» D. 57 V | |
| 26. |
A 3.3 kΩ resistor dissipates 0.25 W. The current is |
| A. | .7 mA |
| B. | 7 mA |
| C. | .7 µA |
| D. | .7 A |
| Answer» B. 7 mA | |
| 27. |
The power rating of a resistor determines the minimum power that it can handle safely. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 28. |
A 220 resistor dissipates 3 W. The voltage is |
| A. | 73.3 V |
| B. | 2.5 V |
| C. | 25.7 V |
| D. | 257 V |
| Answer» D. 257 V | |
| 29. |
A 15 V source is connected across a 12 resistor. How much energy is used in three minutes? |
| A. | 938 Wh |
| B. | 0.938 Wh |
| C. | 56.25 Wh |
| D. | 5.6 Wh |
| Answer» C. 56.25 Wh | |
| 30. |
Energy is equal to power multiplied by voltage. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 31. |
In 40 kW, there are |
| A. | 0.4 mW |
| B. | 40,000 W |
| C. | 400 W |
| D. | 5,000 W |
| Answer» C. 400 W | |
| 32. |
A 3.3 k resistor dissipates 0.25 W. The current is |
| A. | 8.7 mA |
| B. | 87 mA |
| C. | 8.7 µA |
| D. | 8.7 A |
| Answer» B. 87 mA | |
| 33. |
How much continuous current can be drawn from a 60 Ah battery for 14 h? |
| A. | 42.8 A |
| B. | 428 A |
| C. | 4.28 A |
| D. | 4.2 A |
| Answer» D. 4.2 A | |
| 34. |
Watt's law states the relationships of power to energy. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» C. 1 | |
| 35. |
A 120 resistor must carry a maximum current of 25 mA. Its rating should be at least |
| A. | 4.8 W |
| B. | 150 mW |
| C. | 15 mW |
| D. | 480 mW |
| Answer» C. 15 mW | |
| 36. |
The capacity of a battery is measured in milliamperes. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 37. |
A 6 V battery is connected to a 300 load. Under these conditions, it is rated at 40 Ah. How long can it supply current to the load? |
| A. | 1 h |
| B. | 200 h |
| C. | 2,000 h |
| D. | 10 h |
| Answer» D. 10 h | |
| 38. |
The joule is a unit of energy. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» B. | |
| 39. |
When the pointer of an analog ohmmeter reads close to zero, the resistor being measured is |
| A. | overheated |
| B. | shorted |
| C. | open |
| D. | reversed |
| Answer» C. open | |
| 40. |
A certain appliance uses 350 W. If it is allowed to run continuously for 24 days, how many kilowatt-hours of energy does it consume? |
| A. | 20.16 kWh |
| B. | 201.6 kWh |
| C. | 2.01 kWh |
| D. | 8.4 kWh |
| Answer» C. 2.01 kWh | |
| 41. |
A given power supply is capable of providing 6 A for 3.5 h. Its ampere-hour rating is |
| A. | 0.58 Ah |
| B. | 2.1 Ah |
| C. | 21 Ah |
| D. | 58 Ah |
| Answer» D. 58 Ah | |
| 42. |
A power supply produces a 0.6 W output with an input of 0.7 W. Its percentage of efficiency is |
| A. | 0.0857 |
| B. | 0.4285 |
| C. | 0.0428 |
| D. | 0.857 |
| Answer» E. | |
| 43. |
In 0.025 W, there are |
| A. | 25 kW |
| B. | 0.00025 mW |
| C. | 2,500 µW |
| D. | 25 mW |
| Answer» E. | |
| 44. |
The power rating of a carbon-composition resistor that is to handle up to 1.2 W should be |
| A. | 2 W |
| B. | 1 W |
| C. | 5 W |
| D. | 0.5 W |
| Answer» B. 1 W | |
| 45. |
For 12 V and 40 mA, the power is |
| A. | 480 mW |
| B. | 0.480 W |
| C. | 480,000 µW |
| D. | all of the above |
| Answer» E. | |
| 46. |
A 33 half-watt resistor and a 330 half-watt resistor are connected across a 12 V source. Which one(s) will overheat? |
| A. | 33 |
| B. | 330 |
| C. | both resistors |
| D. | neither resistor |
| Answer» E. | |