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. |
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 δis ____________ |
| A. | ωCV2 tanδ |
| B. | ωCV2/tanδ |
| C. | (tanδ/ωCV)2 |
| D. | ωCV2 tanδ2 |
| Answer» B. ωCV2/tanδ | |
| 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. |
Grading of the cables is performed in order to achieve ____________(i) uniform stress(ii) reduction in quantity of insulation(iii) reduction in quality of insulation |
| A. | (i), (ii) |
| B. | (ii) |
| C. | (i),(iii) |
| D. | (ii), (iii) |
| Answer» B. (ii) | |
| 5. |
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. | 2.71882 |
| Answer» B. 0.7188 | |
| 6. |
The ratio of dielectric stress of the on the cable corresponding to the maximum and minimum is ____________ |
| A. | R/r |
| B. | r/R |
| C. | rR |
| D. | (R/r)2 |
| Answer» B. r/R | |
| 7. |
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 | |
| 8. |
Single core cables for ac systems are provided with armouring. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 9. |
Single core cables for AC systems are not provided with armouring. |
| A. | True |
| B. | False |
| Answer» B. False | |