MCQOPTIONS
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MCQOPTIONS
This section includes 21 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. |
Ohm's law describes how current is related to voltage and resistance. |
| A. | rue |
| B. | alse |
| Answer» B. alse | |
| 2. |
The ampere is the unit of resistance. |
| A. | rue |
| B. | alse |
| Answer» C. | |
| 3. |
What is the voltage source for a circuit carrying 2 A of current through a 36 resistor? |
| A. | 1.8 V |
| B. | 18 V |
| C. | 7.2 V |
| D. | 72 V |
| Answer» E. | |
| 4. |
Twelve volts are applied across a resistor. A current of 3 mA is measured. What is the value of the resistor? |
| A. | 4 |
| B. | 400 |
| C. | 4 k |
| D. | 4.4 |
| Answer» D. 4.4 | |
| 5. |
If 24 V are applied across a resistor and there are 10.9 mA of current, the resistance is |
| A. | 220 k |
| B. | 22 k |
| C. | 2.2 k |
| D. | 220 |
| Answer» D. 220 | |
| 6. |
You are measuring the current in a circuit that is operated on an 18 V battery. The ammeter reads 40 mA. Later you notice the current has dropped to 20 mA. How much has the voltage changed? |
| A. | 9 V |
| B. | 900 mV |
| C. | 0 V |
| D. | 18 V |
| Answer» B. 900 mV | |
| 7. |
How much voltage is needed to produce 2.5 A of current through a 200 resistor? |
| A. | 50 V |
| B. | 500 V |
| C. | 80 V |
| D. | 8 V |
| Answer» C. 80 V | |
| 8. |
What is the approximate resistance of a rheostat if the voltage source is 18 V and the current is 220 mA? |
| A. | 8.2 k |
| B. | 820 |
| C. | 8.2 |
| D. | 82 |
| Answer» E. | |
| 9. |
When there is 12 mA of current through a 1.2 k resistor, the voltage across the resistor is |
| A. | 14.4 V |
| B. | 1.4 V |
| C. | 100 V |
| D. | 10 V |
| Answer» B. 1.4 V | |
| 10. |
The formula for finding resistance when current and voltage are known is R = I/V. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 11. |
A 120 V lamp-dimming circuit is controlled by a rheostat and protected from excessive current by a 3 A fuse. To what minimum resistance value can the rheostat be set without blowing the fuse? Assume a lamp resistance of 20 ohms. |
| A. | 40 |
| B. | 4 |
| C. | 2 |
| D. | 20 |
| Answer» E. | |
| 12. |
When 12 V are applied across a 68 resistor, the current is |
| A. | 816 mA |
| B. | 17.6 mA |
| C. | 176 mA |
| D. | 8.16 mA |
| Answer» D. 8.16 mA | |
| 13. |
How much resistance is needed to draw 17.6 mA from a 12 volt source? |
| A. | 212 |
| B. | 6.8 k |
| C. | 68 |
| D. | 680 |
| Answer» E. | |
| 14. |
A resistor is connected across a 50 V source. What is the current in the resistor if the color code is red, orange, orange, silver? |
| A. | 2 mA |
| B. | 2.2 mA |
| C. | 214 mA |
| D. | 21.4 mA |
| Answer» C. 214 mA | |
| 15. |
If 750 µA is flowing through 11 k of resistance, what is the voltage drop across the resistor? |
| A. | 8.25 V |
| B. | 82.5 V |
| C. | 14.6 V |
| D. | 146 V |
| Answer» B. 82.5 V | |
| 16. |
A resistance of 3.3 M is connected across a 500 V source. The resulting current is approximately |
| A. | 15.1 µA |
| B. | 151 µA |
| C. | 66 mA |
| D. | 660 mA |
| Answer» C. 66 mA | |
| 17. |
The formula for finding voltage when resistance and current are known is V = I/R. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» C. 1 | |
| 18. |
Approximately how many milliamperes of current flow through a circuit with a 40 V source and 6.8 k of resistance? |
| A. | 27.2 mA |
| B. | 59 mA |
| C. | 5.9 mA |
| D. | 590 mA |
| Answer» D. 590 mA | |
| 19. |
The formula to find I when the values of V and R are known is |
| A. | I = VR |
| B. | I = R/V |
| C. | V = IR |
| D. | I = V/R |
| Answer» E. | |
| 20. |
How much resistance is required to limit the current from a 12 V battery to 3.6 mA? |
| A. | 3.3 k |
| B. | 33 k |
| C. | 2.2 k |
| D. | 22 k |
| Answer» B. 33 k | |
| 21. |
An electric heater draws 3.5 A from a 110 V source. The resistance of the heating element is approximately |
| A. | 385 |
| B. | 38.5 |
| C. | 3.1 |
| D. | 31 |
| Answer» E. | |