MCQOPTIONS
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MCQOPTIONS
This section includes 11 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering Mcqs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The resistance of a conductor of diameter d and length l is R . If the diameter of the conductor is halved and its length is doubled, the resistance will be |
| A. | R |
| B. | 2R |
| C. | 4R |
| D. | 8R |
| Answer» E. | |
| 2. |
Ohm s law is not applicable to____________? |
| A. | Vacuum tubes |
| B. | Carbon resistors |
| C. | High voltage circuits |
| D. | Circuits with low current densities |
| Answer» B. Carbon resistors | |
| 3. |
If/, R and t are the current, resistance and time respectively, then according to Joule s law heat produced will be proportional to_______________? |
| A. | I2Rt |
| B. | I2Rf |
| C. | I2R2t |
| D. | I2R2t* |
| Answer» B. I2Rf | |
| 4. |
The hot resistance of the bulb s filament is higher than its cold resistance because the temperature co-efficient of the filament is___________________? |
| A. | Zero |
| B. | Negative |
| C. | Positive |
| D. | About 2 ohms per degree |
| Answer» D. About 2 ohms per degree | |
| 5. |
Switching of a lamp in house produces noise in the radio. This is because switching operation produces________? |
| A. | Arcs across separating contacts |
| B. | Mechanical noise of high intensity |
| C. | Both mechanical noise and arc between contacts |
| D. | None of the above |
| Answer» B. Mechanical noise of high intensity | |
| 6. |
A field of force can exist only between_____________? |
| A. | Two molecules |
| B. | Two ions |
| C. | Two atoms |
| D. | Two metal particles |
| Answer» C. Two atoms | |
| 7. |
Ohm s law is not applicable to__________? |
| A. | Semi-conductors |
| B. | D. C. circuits |
| C. | Small resistors |
| D. | High currents |
| Answer» B. D. C. circuits | |
| 8. |
A nichrome wire used as a heater coil has the resistance of 2 2/m. For a heater of 1 kW at 200 V, the length of wire required will be_____________? |
| A. | 80 m |
| B. | 60 m |
| C. | 40 m |
| D. | 20 m |
| Answer» E. | |
| 9. |
Temperature co-efficient of resistance is expressed in terms of___________? |
| A. | Ohms/ C |
| B. | Mhos/ohm C |
| C. | Ohms/ohm C |
| D. | Mhos/ C |
| Answer» D. Mhos/ C | |
| 10. |
The condition for the validity under Ohm s law is that_______________? |
| A. | Resistance must be uniform |
| B. | Current should be proportional to the size of the resistance |
| C. | Resistance must be wire wound type |
| D. | Temperature at positive end should be more than the temperature at negative end |
| Answer» B. Current should be proportional to the size of the resistance | |
| 11. |
For which of the following ampere second could be the unit ? |
| A. | Reluctance |
| B. | Charge |
| C. | Power |
| D. | Energy |
| Answer» C. Power | |