MCQOPTIONS
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MCQOPTIONS
This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Measurements knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Thermal emf can be prevented by _________ |
| A. | using more sensitive galvanometers |
| B. | using similar metals |
| C. | by separating the dissimilar metals |
| D. | reducing the supply emf |
| Answer» B. using similar metals | |
| 2. |
How is thermal emf generated? |
| A. | when current flows |
| B. | when voltage is applied |
| C. | when the null detector is connected |
| D. | when dissimilar metals come in contact |
| Answer» E. | |
| 3. |
The main error when measuring low resistances is _________ |
| A. | power dissipation of the arms |
| B. | voltage drop across the emf source |
| C. | lead and contact resistance |
| D. | current flowing through the circuit |
| Answer» D. current flowing through the circuit | |
| 4. |
Heating effect in the Wheatstone bridge can be avoided by _________ |
| A. | using an expensive emf source |
| B. | limiting current to a safe value |
| C. | using heating sinks |
| D. | immersing the setup in ice |
| Answer» C. using heating sinks | |
| 5. |
What is the effect of the increase in temperature on the resistance elements? |
| A. | directly proportional |
| B. | independent |
| C. | inversely proportional |
| D. | changes by a factor of 10 |
| Answer» B. independent | |
| 6. |
When current passes through the resistances in the Wheatstone bridge what happens? |
| A. | voltage drop occurs |
| B. | null detector burns |
| C. | back emf is induced |
| D. | temperature increases due to power dissipation |
| Answer» E. | |
| 7. |
What is the main source of error in a null detector? |
| A. | lower current detection ability |
| B. | insufficient sensitivity of the null detector |
| C. | wiring resistance |
| D. | power dissipation |
| Answer» C. wiring resistance | |
| 8. |
The source of error in a Wheatstone bridge is due to _________ |
| A. | range of galvanometer used |
| B. | type of the source of emf used |
| C. | limiting errors of the three known resistances |
| D. | balance condition |
| Answer» D. balance condition | |
| 9. |
The Wheatstone bridge is used for the measurement of _________ |
| A. | 1 to a few megaohms |
| B. | 1k to a few megaohms |
| C. | 1M to a few gigaohms |
| D. | 1m to a few ohms |
| Answer» B. 1k to a few megaohms | |