Exam Details
| Subject | Power Distribution System- Basics | |
| Paper | ||
| Exam / Course | Certificate of Competency in Power Distribution (CCPD) | |
| Department | School of Engineering & Technology (SOET) | |
| Organization | indira gandhi national open university | |
| Position | ||
| Exam Date | December, 2016 | |
| City, State | new delhi, |
Question Paper
1. Fill in the blanks by choosing the correct answers from the choices given below:
small, tampering, preventing, weekly/fortnightly,
650, 70, maintenance, 33000, separation, cores, bivector, minor, rod, protection, collection
In a cross loop arrangement, the feeders are normally loaded up to of their current carrying capacity so that in the event of breakdown they can share the load of other feeders also.
Isolators are mechanical switching devices capable of opening or closing a current.
Energy realised is calculated by multiplying energy billed by efficiency.
Commercial losses are caused by of meters.
Aerial bunched cables are used by the utility for theft.
A meter records active and apparent energy along with maximum demand.
insulation test is conducted to test the dielectric strength of the interturn and interphase insulation.
(viii) Cross arms are provided on a pole to provide mechanical support to conductors while maintaining the recommended between them.
Pipe earthing or earthing is provided on distribution substations.
Breather oil, silica gel for distribution transformer is checked
Above V and up to volt are defined as high voltage.
Earthing switches are provided at various locations to facilitate
(xiii) The station battery supplies energy to operate systems.
The rated voltage of lightning arresters should be kV for effectively earthed system and nominal discharge current rating should be kA.
A cross or short circuit fault is one in which the insulation between two cables or between two of a multi core cable is faulty.
2. State whether the following statements are True or False:
Pin insulators are "Ball and Socket" or "Tongue and Clevis" type.
The radial distribution system is used in urban areas.
"Panther" or "Dog" refers to trade names of conductors.
In case of CTs protection core is used for metering.
Defective metering contributes to technical losses.
Spot billing machine is used for correct billing and timely delivery of bills.
Insulators prevent the electric current from energising the power pole.
(viii) Breakdown maintenance should be carried out for detecting deterioration and maloperation of the system components.
Direct mounting is used for transformers upto 25 kVA only.
Service line should be taken off at support only.
3. Match the following given in Column A with ColumnB:
ColumnA ColumnB
Breather Transformer
HVDS Silica gel
Circuit breaker Reduced losses
Ratio test Vacuum
Oil fire Foam type
extinguisher
Answer any eight(8) questions from the following:
4. Explain the purpose of providing explosion vent and conservator tank on a transformer.
5. Explain reactive compensation for a distribution substation.
6. Describe the activities for preparation of long term plan for technical loss reduction.
7. What is energy accounting and auditing Describe how it will help in reduction of losses.
8. Describe the Section 135 of Electricity Act, 2003.
9. Why should overloading of distribution transformer be avoided and how can it be prevented
10. What is the procedure followed for permit to work.
11. Explain the advantages of using high voltage distribution system.
12. Write a short note on possible methods of cable laying.
13. Describe two types of supports used for overhead lines.
14. Why are 3-phase 4-wire meters preferred over 3-phase 3-wire meters for recording consumption of LT power consumers?
15. Explain the difference between T D losses and AT C losses.
16. What installation practices should be adopted for meters to guard against tampers?
small, tampering, preventing, weekly/fortnightly,
650, 70, maintenance, 33000, separation, cores, bivector, minor, rod, protection, collection
In a cross loop arrangement, the feeders are normally loaded up to of their current carrying capacity so that in the event of breakdown they can share the load of other feeders also.
Isolators are mechanical switching devices capable of opening or closing a current.
Energy realised is calculated by multiplying energy billed by efficiency.
Commercial losses are caused by of meters.
Aerial bunched cables are used by the utility for theft.
A meter records active and apparent energy along with maximum demand.
insulation test is conducted to test the dielectric strength of the interturn and interphase insulation.
(viii) Cross arms are provided on a pole to provide mechanical support to conductors while maintaining the recommended between them.
Pipe earthing or earthing is provided on distribution substations.
Breather oil, silica gel for distribution transformer is checked
Above V and up to volt are defined as high voltage.
Earthing switches are provided at various locations to facilitate
(xiii) The station battery supplies energy to operate systems.
The rated voltage of lightning arresters should be kV for effectively earthed system and nominal discharge current rating should be kA.
A cross or short circuit fault is one in which the insulation between two cables or between two of a multi core cable is faulty.
2. State whether the following statements are True or False:
Pin insulators are "Ball and Socket" or "Tongue and Clevis" type.
The radial distribution system is used in urban areas.
"Panther" or "Dog" refers to trade names of conductors.
In case of CTs protection core is used for metering.
Defective metering contributes to technical losses.
Spot billing machine is used for correct billing and timely delivery of bills.
Insulators prevent the electric current from energising the power pole.
(viii) Breakdown maintenance should be carried out for detecting deterioration and maloperation of the system components.
Direct mounting is used for transformers upto 25 kVA only.
Service line should be taken off at support only.
3. Match the following given in Column A with ColumnB:
ColumnA ColumnB
Breather Transformer
HVDS Silica gel
Circuit breaker Reduced losses
Ratio test Vacuum
Oil fire Foam type
extinguisher
Answer any eight(8) questions from the following:
4. Explain the purpose of providing explosion vent and conservator tank on a transformer.
5. Explain reactive compensation for a distribution substation.
6. Describe the activities for preparation of long term plan for technical loss reduction.
7. What is energy accounting and auditing Describe how it will help in reduction of losses.
8. Describe the Section 135 of Electricity Act, 2003.
9. Why should overloading of distribution transformer be avoided and how can it be prevented
10. What is the procedure followed for permit to work.
11. Explain the advantages of using high voltage distribution system.
12. Write a short note on possible methods of cable laying.
13. Describe two types of supports used for overhead lines.
14. Why are 3-phase 4-wire meters preferred over 3-phase 3-wire meters for recording consumption of LT power consumers?
15. Explain the difference between T D losses and AT C losses.
16. What installation practices should be adopted for meters to guard against tampers?
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Subjects
- Electricity and Safety Measures
- Power Distribution System- Basics