MCQOPTIONS
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MCQOPTIONS
This section includes 12 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. | mH/kmd) 0.461 log(d/r) H/km |
| Answer» B. 0.4 log(d/r) mH/km | |
| 2. |
The flux density B, y meters from the centre of conductors in the following diagram, is _______ 11.The internal flux linking the single infinite conductor causes the inductance of ___________ |
| A. | 0.5 *10-7 H/m |
| B. | 2 *10-7 H/m |
| C. | 0.5 *10-7 ln(r) H/m |
| D. | 2 *10-6 H/mView Answer |
| Answer» B. 2 *10-7 H/m | |
| 3. |
If the flux linkages are varied sinusoid with current, then what can be concluded about the inductance?a) Constantb) Varying with the currentc) Linearly varyingd) Exponential change 8.The principle behind the influence of the power lines on the telephone lines is __________ |
| A. | Constantb) Varying with the currentc) Linearly varyingd) Exponential change 8.The principle behind the influence of the power lines on the telephone lines is __________a) Faraday’s laws |
| B. | Varying with the currentc) Linearly varyingd) Exponential change 8.The principle behind the influence of the power lines on the telephone lines is __________a) Faraday’s lawsb) Mutual inductance |
| C. | Linearly varyingd) Exponential change 8.The principle behind the influence of the power lines on the telephone lines is __________a) Faraday’s lawsb) Mutual inductancec) Self inductance |
| D. | Exponential change 8.The principle behind the influence of the power lines on the telephone lines is __________a) Faraday’s lawsb) Mutual inductancec) Self inductanced) All of the mentionedView Answer |
| Answer» C. Linearly varyingd) Exponential change 8.The principle behind the influence of the power lines on the telephone lines is __________a) Faraday’s lawsb) Mutual inductancec) Self 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 μF |
| B. | 76.2 μF |
| C. | 32.2 μF |
| D. | 24 μF |
| Answer» B. 76.2 μF | |
| 5. |
If the power system network is at Vs∠δ and receiving end voltage is Vr∠0 consisting of the impedance of TL as (R+j5)Ω. 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 | |
| 7. |
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 | |
| 8. |
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 | |
| 9. |
If the flux linkages are varied sinusoid with current, then what can be concluded about the inductance? |
| A. | Constant |
| B. | Varying with the current |
| C. | Linearly varying |
| D. | Exponential change |
| Answer» C. Linearly varying | |
| 10. |
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 resistance is ___________ |
| A. | 653.4 Ω |
| B. | 753.6 Ω |
| C. | 280.4 Ω |
| D. | 682 Ω |
| Answer» B. 753.6 ‚Äö√Ñ√∂‚àö√´¬¨‚àÇ | |
| 11. |
If the power system network is at Vs∠δ and receiving end voltage is Vr∠0 consisting of the impedance of TL as (R+j5)Ω. 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 | |
| 12. |
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√ó103 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 | |