MCQOPTIONS
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MCQOPTIONS
This section includes 5 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. |
Dielectric power loss of a transmission line cable operating for V volts, f Hz having a capacitance of C Farads with the tangent loss angle of is ____________ |
| A. | CV<sup>2</sup> tan |
| B. | CV<sup>2</sup>/tan |
| C. | (tan / CV)<sup>2</sup> |
| D. | CV<sup>2</sup> tan <sup>2</sup> |
| Answer» B. CV<sup>2</sup>/tan | |
| 2. |
Consider a system having a cable of capacitance 5 nF, with 765 kV star connected at 50 Hz having a power loss in the cable as 82.1 kW. Then the dielectric loss angle is _________(in degrees). |
| A. | 15 |
| B. | 7.5 |
| C. | 20 |
| D. | 4.9 |
| Answer» B. 7.5 | |
| 3. |
The resistance of the insulation used for the cables is 40 ohms for a length of x km. If the proposed plan needs to extend the transmission line cable to extra 2x m then the resistance of the cable offered will be _____________ (in ohms). |
| A. | 13.33 |
| B. | 20 |
| C. | 120 |
| D. | 40 |
| Answer» B. 20 | |
| 4. |
The condition at which the minimized dielectric stress condition (R/r) will take place is ______________ |
| A. | 2.7188 |
| B. | 0.7188 |
| C. | 1/2.7188 |
| D. | 2.7188<sup>2</sup> |
| Answer» B. 0.7188 | |
| 5. |
For a transmission system of voltage 765 kV volts having the core radius of 5 cm and outer radius of 0.40 m. The maximum dielectric stress on single core cable is _________ |
| A. | 7357.7 kV |
| B. | 919.7 kV |
| C. | 4247 kV |
| D. | 530 kV |
| Answer» B. 919.7 kV | |