MCQOPTIONS
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MCQOPTIONS
This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Alternating Current and Voltage knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
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 | |
| 2. |
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 | |
| 3. |
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 | |
| 4. |
Three hundred joules of energy are consumed in 15 s. The power is |
| A. | 2,000 W |
| B. | 2 W |
| C. | 20 W |
| D. | 200 W |
| Answer» D. 200 W | |
| 5. |
A half-watt is equal to how many milliwatts? |
| A. | 5,000 mW |
| B. | 5 mW |
| C. | 500 mW |
| D. | 50 mW |
| Answer» D. 50 mW | |
| 6. |
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 | |
| 7. |
How many watt-hours represent 65 W used for 18 h? |
| A. | 11.7 Wh |
| B. | 1,170 Wh |
| C. | 11,700 Wh |
| D. | 117,000 Wh |
| Answer» C. 11,700 Wh | |
| 8. |
If it takes 400 ms to use 12,000 J of energy, the power is |
| A. | 30 kW |
| B. | 30 W |
| C. | 3 W |
| D. | 300 kW |
| Answer» B. 30 W | |
| 9. |
If you used 600 W of power for 60 h, you have used |
| A. | 36 kWh |
| B. | 3.6 kWh |
| C. | 10 kWh |
| D. | 1 kWh |
| Answer» B. 3.6 kWh | |
| 10. |
If you used 400 W of power for 30 h, you have used |
| A. | 1.3 kWh |
| B. | 13.3 kWh |
| C. | 1.2 kWh |
| D. | 12 kWh |
| Answer» E. | |
| 11. |
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 | |
| 12. |
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 | |
| 13. |
At the end of a 14 day period, your utility bill shows that you have used 18 kWh. What is your average daily power? |
| A. | 1.286 kWh |
| B. | 12.85 kWh |
| C. | 535 kWh |
| D. | 252 kWh |
| Answer» B. 12.85 kWh | |
| 14. |
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 | |
| 15. |
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. | |