MCQOPTIONS
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MCQOPTIONS
This section includes 15 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. |
Voltage distribution across disc of strings of suspension insulator assembly is ______ |
| A. | same for all disks |
| B. | maximum for unit nearest to the line |
| C. | maximum for unit nearest to the tower |
| D. | equal to transmission line voltage rating |
| Answer» C. maximum for unit nearest to the tower | |
| 2. |
If a string of suspension insulator has three units, each can withstand a maximum 11 KV and total string can withstand 25.76 KV. What is the string efficiency? |
| A. | 234.1% |
| B. | 46.3% |
| C. | 68.75% |
| D. | 78% |
| Answer» E. | |
| 3. |
What is the most common cause of failure of overhead line insulators? |
| A. | Flashover |
| B. | Mechanical stress |
| C. | Porosity of materials |
| D. | Improper vitrification |
| Answer» B. Mechanical stress | |
| 4. |
Suspension type insulator are subjected to ______________ |
| A. | tensile stress |
| B. | compressive stress |
| C. | tensile and compressive stress |
| D. | depends on its use |
| Answer» B. compressive stress | |
| 5. |
WHAT_IS_THE_MOST_COMMON_CAUSE_OF_FAILURE_OF_OVERHEAD_LINE_INSULATORS??$ |
| A. | Flashover |
| B. | Mechanical stress |
| C. | Porosity of materials |
| D. | Improper vitrification |
| Answer» B. Mechanical stress | |
| 6. |
Voltage distribution across disc of strings of suspension insulator assembly is ______$ |
| A. | same for all disks |
| B. | maximum for unit nearest to the line |
| C. | maximum for unit nearest to the tower |
| D. | equal to transmission line voltage rating |
| Answer» C. maximum for unit nearest to the tower | |
| 7. |
If_a_string_of_suspension_insulator_has_three_units,_each_can_withstand_a_maximum_11_KV_and_total_string_can_withstand_25.76_KV._What_is_the_string_efficiency?$ |
| A. | 234.1% |
| B. | 46.3% |
| C. | 68.75% |
| D. | 78% |
| Answer» E. | |
| 8. |
Which type of insulator is used where there is dead end of the line or there is a corner or a sharp curve, for high voltage line? |
| A. | Pin type insulator |
| B. | Shackle insulator |
| C. | Strain insulator |
| D. | Stay insulator |
| Answer» D. Stay insulator | |
| 9. |
Which of the following insulator is similar to pin type insulator? |
| A. | Suspension insulator |
| B. | Post insulator |
| C. | Strain insulator |
| D. | Shackle insulator |
| Answer» C. Strain insulator | |
| 10. |
Suspension insulator are made up of _____________ |
| A. | glass |
| B. | porcelain |
| C. | steatite |
| D. | epoxy resin |
| Answer» C. steatite | |
| 11. |
A transmission line consists of 9 discs of suspension insulator in each string. What is the operating voltage of the transmission line? |
| A. | 11 KV |
| B. | 33 KV |
| C. | 66 KV |
| D. | 132 KV |
| Answer» E. | |
| 12. |
Suspension type insulator are subjected to ______________ |
| A. | tensile stress |
| B. | compressive stress |
| C. | tensile and compressive stress |
| D. | depends on its use |
| Answer» B. compressive stress | |
| 13. |
Which of the following is the main field of application of pin type insulator? |
| A. | Distribution system |
| B. | Transmission system |
| C. | Transmission and distribution system |
| D. | EHV transmission system |
| Answer» B. Transmission system | |
| 14. |
Pin type insulator are mostly subjected to which type of mechanical stress? |
| A. | Compressive stress |
| B. | Tensile stress |
| C. | Both tensile and compressive stress |
| D. | Twisting stress |
| Answer» E. | |
| 15. |
Which of the following material is not used for overhead line insulators? |
| A. | Porcelain |
| B. | Glass |
| C. | PVC |
| D. | Steatite |
| Answer» D. Steatite | |