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 balanced delta-connected load of (2+j3) per phase is connected to a balanced three-phase 440V supply. The phase current is 10A. Find the apparent power. |
| A. | 10955.67 VAR |
| B. | 10.95567 VAR |
| C. | 109.5567 VAR |
| D. | 1.095567 VAR |
| Answer» B. 10.95567 VAR | |
| 2. |
A balanced delta-connected load of (2+j3) per phase is connected to a balanced three-phase 440V supply. The phase current is 10A. Find the total active power. |
| A. | 7.26W |
| B. | 726W |
| C. | 7260W |
| D. | 72.6W |
| Answer» D. 72.6W | |
| 3. |
In a delta connected system, the expression of power (P) is? |
| A. | V<sub>L</sub>I<sub>L</sub>cos W |
| B. | 3 V<sub>L</sub>I<sub>L</sub>cos W |
| C. | 3V<sub>L</sub>I<sub>L</sub>cos W |
| D. | 3 3V<sub>L</sub>I<sub>L</sub>cos W |
| Answer» C. 3V<sub>L</sub>I<sub>L</sub>cos W | |
| 4. |
The line currents are ________ behind respective phase currents in a delta connected system. |
| A. | 120 |
| B. | 90 |
| C. | 60 |
| D. | 30 |
| Answer» E. | |
| 5. |
The relation between IL and IPh is in a delta connected system is? |
| A. | I<sub>L</sub> = I<sub>Ph</sub> |
| B. | I<sub>L</sub> = 3 I<sub>Ph</sub> |
| C. | I<sub>L</sub> = 3 I<sub>Ph</sub> |
| D. | I<sub>L</sub> = 3 3I<sub>Ph</sub> |
| Answer» C. I<sub>L</sub> = 3 I<sub>Ph</sub> | |
| 6. |
In a delta-connected system, the currents IR = IB = IY =? |
| A. | I<sub>Ph</sub> |
| B. | 2I<sub>Ph</sub> |
| C. | 3I<sub>Ph</sub> |
| D. | 4I<sub>Ph</sub> |
| Answer» B. 2I<sub>Ph</sub> | |
| 7. |
In delta-connected system, the currents IR, IY, IB are equal in magnitude and they are displaced by _____ from one another. |
| A. | 0 |
| B. | 60 |
| C. | 90 |
| D. | 120 |
| Answer» E. | |
| 8. |
In a delta connected system, the voltage across the terminals R and Y is 400 0 . Find the line voltage VBR. |
| A. | 400 240 |
| B. | 400 120 |
| C. | 400 -240 |
| D. | 400 -120 |
| Answer» D. 400 -120 | |
| 9. |
In a delta connected system, the voltage across the terminals R and Y is 400 0 . Find the line voltage VYB. |
| A. | 400 120 |
| B. | 400 -120 |
| C. | 400 240 |
| D. | 400 -240 |
| Answer» C. 400 240 | |
| 10. |
In a delta connected system, the voltage across the terminals R and Y is 400 0 . Calculate the line voltage VRY. Assume RRY phase sequence. |
| A. | 400 0 |
| B. | 400 120 |
| C. | 400 -120 |
| D. | 400 240 |
| Answer» B. 400 120 | |