MCQOPTIONS
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MCQOPTIONS
This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Power Systems knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A three phase transformer has a nameplate rating of 30 MVA, 230Y/69Y kV with a leakage -reactance of 10% and the transformer connection is wye-wye. Choosing a base of 30MVA and 230 kV on high voltage side, the transformer reactance referred to the low voltage side will be _______(in ohms). |
| A. | 15.87 Ω |
| B. | 157.8 Ω |
| C. | 176.33 Ω |
| D. | 17.67 Ω |
| Answer» B. 157.8 Ω | |
| 2. |
In impedance diagram different power system elements are represented by symbols. |
| A. | True |
| B. | False |
| Answer» C. | |
| 3. |
Single line diagram of which of the following power system is possible? |
| A. | Power system with LLG fault |
| B. | Power system with LG fault |
| C. | Power system with LL fault |
| D. | Balanced power system |
| Answer» E. | |
| 4. |
Single line diagram does not represents: |
| A. | Star connection of transformer winding |
| B. | Delta connection of transformer winding |
| C. | Neutral wire of transmission lines |
| D. | Ratings of machines |
| Answer» D. Ratings of machines | |
| 5. |
Reactance diagram contains which of the following ? |
| A. | Resistance of Alternator |
| B. | Resistance of transformer winding |
| C. | Induction motor’s equivalent corcuit |
| D. | Inductive reactance of transmission lines |
| Answer» E. | |
| 6. |
Impedance diagram is used for analysis of __________ |
| A. | Load flow |
| B. | Alternator |
| C. | Fault |
| D. | Transmission Line |
| Answer» B. Alternator | |
| 7. |
Which of the following is not neglected during formation of reactance diagram from impedance diagram? |
| A. | Resistance of various power system components |
| B. | Static loads |
| C. | Shunt component of Transformers |
| D. | Reactance of alternators |
| Answer» E. | |
| 8. |
What is the main purpose of reactance diagram? |
| A. | Load flow analysis |
| B. | Falt analysis |
| C. | Calculation of ratings of Alternators |
| D. | Calculation of ratings of Transformers |
| Answer» C. Calculation of ratings of Alternators | |
| 9. |
A three phase transformer has a nameplate rating of 30 MVA, 230Y/69Y kV with a leakage -reactance of 10% and the transformer connection is wye-wye. Choosing a base of 30MVA and 230 kV on high voltage side, the transformer reactance referred to the low voltage side will be _______(in ohms)? |
| A. | 15.87 Ω |
| B. | 157.8 Ω |
| C. | 176.33 Ω |
| D. | 17.67 Ω |
| Answer» B. 157.8 ‚Äö√Ñ√∂‚àö√´¬¨‚àÇ | |