MCQOPTIONS
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MCQOPTIONS
This section includes 8 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 lossless TL having SIL of 3000 MW is provided with uniform distributed series capacitance compensation of 25% and shunt compensation of 30% then the compensated impedance of TL will be(in pu) ____________ |
| A. | 0.7595 |
| B. | 2.88 |
| C. | 0.647 |
| D. | 3.27 |
| Answer» B. 2.88 | |
| 2. |
A lossless TL having SIL of 3000 MW is provided with uniform distributed series capacitance compensation of 25% and shunt compensation of 30% then the SIL of compensated TL will be _______________ |
| A. | 3949.9 |
| B. | 3289 |
| C. | 2784.9 |
| D. | 2877.6 |
| Answer» B. 3289 | |
| 3. |
For a 100 MVA, 11 kV three phase Alternator observes a three phase fault at terminals of it. If the fault current is 2000 A, the pu value of positive sequence reactance ______ |
| A. | 2.62 |
| B. | 0.46 |
| C. | 1.31 |
| D. | 0.92 |
| Answer» B. 0.46 | |
| 4. |
A fault current of 1500A passing through the primary side of a 400/5 CT. On the secondary side an inverse time over current relay is connected whose current setting is 75%, the plug setting is __________ |
| A. | 5 |
| B. | 3.75 |
| C. | 6 |
| D. | 4 |
| Answer» B. 3.75 | |
| 5. |
The inertia constant of two groups of machines which do not swing together are 4 and 20 MJ/MVA, the equivalent inertia constant of the system is _________ |
| A. | 2.85 |
| B. | 14 |
| C. | 6 |
| D. | 12 |
| Answer» B. 14 | |
| 6. |
If all the sequence voltages at the fault point in a power system are equal, then fault is __________ |
| A. | LLG fault |
| B. | LG fault |
| C. | Three phase to ground fault |
| D. | Line to Line fault |
| Answer» B. LG fault | |
| 7. |
If short TL is delivering a lagging power factor load, sending end p.f. would be ________ |
| A. | (V<sub>r</sub>cos <sub>r</sub>+IR)/Vs |
| B. | (V<sub>r</sub>cos <sub>r</sub>+IRsin <sub>r</sub>)/Vs |
| C. | (V<sub>r</sub>sin <sub>r</sub>+IR)/V<sub>s</sub> |
| D. | (V<sub>s</sub>sin r+IRcos r)/V<sub>s</sub> |
| Answer» B. (V<sub>r</sub>cos <sub>r</sub>+IRsin <sub>r</sub>)/Vs | |
| 8. |
An isolated generator connected to a turbine with its continuous maximum power of 20 MW, 50 Hz. Generator connected with two loads of 8 MW, each operate at 50 Hz.. Generator has 5% droop characteristic. If an additional load of 6 MW is added then the change in the frequency will be ____________ |
| A. | 0.25 |
| B. | 0.75 |
| C. | 0.5 |
| D. | 1 |
| Answer» B. 0.75 | |