MCQOPTIONS
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MCQOPTIONS
This section includes 6 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. |
The inductance of the conductor contributed by the flux between the point D outside at the distance d from conductor is _____________ |
| A. | 0.461 log(d/r) mH/km |
| B. | 0.4 log(d/r) mH/km |
| C. | 0.461 log(r/d) mH/km |
| D. | 0.461 log(d/r) H/km |
| Answer» B. 0.4 log(d/r) mH/km | |
| 2. |
11.The internal flux linking the single infinite conductor causes the inductance of ___________ |
| A. | 0.5 *10<sup>-7</sup> H/m |
| B. | 2 *10<sup>-7</sup> H/m |
| C. | 0.5 *10<sup>-7</sup> ln(r) H/m |
| D. | 2 *10<sup>-6</sup> H/m |
| Answer» B. 2 *10<sup>-7</sup> H/m | |
| 3. |
The principle behind the influence of the power lines on the telephone lines is __________ |
| A. | Faraday s laws |
| B. | Mutual inductance |
| C. | Self inductance |
| D. | All of the mentioned |
| Answer» B. Mutual inductance | |
| 4. |
At a 33kV 50 Hz to a bus a load of 35 MW is connected. To improve the power factor to unity a synchronous phase modifier is connected taking 5 MW. If the SPM is represented as delta connected impedance, where in each phase we have capacitor connected parallel to resistance forming RC parallel network, then the value of this capacitance is __________ |
| A. | 25.57 F |
| B. | 76.2 F |
| C. | 32.2 F |
| D. | 24 F |
| Answer» B. 76.2 F | |
| 5. |
If the power system network is at Vs and receiving end voltage is Vr 0 consisting of the impedance of TL as (R+j5) . For maximum power transfer to the load, the most appropriate value of resistance R should be __________ |
| A. | 1.732 |
| B. | 3 |
| C. | 1.2 |
| D. | 0.33 |
| Answer» B. 3 | |
| 6. |
A 500 MW, 21 kV, 50 Hz three phase two pole alternator has 0.8 lagging p.f. with moment of inertia of 27.5 103 kgm-2. The inertia constant H will be _______ MJ/MVA. |
| A. | 2.17 |
| B. | 4.2 |
| C. | 2.82 |
| D. | 2.62 |
| Answer» B. 4.2 | |