MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Network Theory knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A single wattmeter is connected to measure the reactive power of a three-phase, three-wire balanced load. The line current is 17A and the line voltage is 440V. Calculate the power factor of the load if the reading of the wattmeter is 4488 VAR. |
| A. | 0.6 |
| B. | 0.8 |
| C. | 1 |
| D. | 1.2 |
| Answer» C. 1 | |
| 2. |
The total reactive power in the load while measuring the reactive power with wattmeter is? |
| A. | 3V<sub>L</sub>I<sub>L</sub>cos |
| B. | 3V<sub>L</sub>I<sub>L</sub>tan |
| C. | 3V<sub>L</sub>I<sub>L</sub>sin |
| D. | 3 V<sub>L</sub>I<sub>L</sub>sec |
| Answer» D. 3 V<sub>L</sub>I<sub>L</sub>sec | |
| 3. |
The wattmeter reading while measuring the reactive power with wattmeter is? |
| A. | V<sub>L</sub>I<sub>L</sub>sec |
| B. | V<sub>L</sub>I<sub>L</sub>sin |
| C. | V<sub>L</sub>I<sub>L</sub>tan |
| D. | V<sub>L</sub>I<sub>L</sub>cos |
| Answer» C. V<sub>L</sub>I<sub>L</sub>tan | |
| 4. |
The readings of the two watt meters used to measure power in a capacitive load are -3000W and 8000W respectively. Find the power factor. |
| A. | 0.25 |
| B. | 0.5 |
| C. | 0.75 |
| D. | 1 |
| Answer» B. 0.5 | |
| 5. |
The readings of the two watt meters used to measure power in a capacitive load are -3000W and 8000W respectively. Calculate the input power. Assume RYB sequence. |
| A. | 5 |
| B. | 50 |
| C. | 500 |
| D. | 5000 |
| Answer» E. | |
| 6. |
The input power to a three-phase load is 10kW at 0.8 Pf. Two watt meters are connected to measure the power. Find the reading of lower reading wattmeter. |
| A. | 1.835 |
| B. | 2.835 |
| C. | 3.835 |
| D. | 4.835 |
| Answer» C. 3.835 | |
| 7. |
The input power to a three-phase load is 10kW at 0.8 Pf. Two watt meters are connected to measure the power. Find the reading of higher reading wattmeter. |
| A. | 7.165 |
| B. | 6.165 |
| C. | 6.165 |
| D. | 4.165 |
| Answer» B. 6.165 | |
| 8. |
The wattmeter method is used to measure power in a three-phase load. The wattmeter readings are 400W and -35W. Find the reactive power. |
| A. | 751.44 |
| B. | 752.44 |
| C. | 753.44 |
| D. | 754.44 |
| Answer» D. 754.44 | |
| 9. |
The wattmeter method is used to measure power in a three-phase load. The wattmeter readings are 400W and -35W. Find the power factor. |
| A. | 0.43 |
| B. | 0.53 |
| C. | 0.63 |
| D. | 0.73 |
| Answer» B. 0.53 | |
| 10. |
The wattmeter method is used to measure power in a three-phase load. The wattmeter readings are 400W and -35W. Calculate the total active power. |
| A. | 360 |
| B. | 365 |
| C. | 370 |
| D. | 375 |
| Answer» C. 370 | |