MCQOPTIONS
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MCQOPTIONS
This section includes 122 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. |
Coincidence factor is reciprocal of ___________ |
| A. | average load |
| B. | demand factor |
| C. | capacity factor |
| D. | diversity factor |
| Answer» E. | |
| 2. |
The load factor is __________ |
| A. | always less than unity |
| B. | less than or greater than 1 |
| C. | always greater than 1 |
| D. | less than zero |
| Answer» B. less than or greater than 1 | |
| 3. |
The primary reason for low power factor is supply system is due to installation of |
| A. | induction motors |
| B. | synchronous motors |
| C. | single phase motors |
| D. | d.c. motors |
| Answer» B. synchronous motors | |
| 4. |
which of the following plants ? |
| A. | Base load plants |
| B. | Peak load plants |
| C. | Both (A) and (B) |
| D. | none of the above |
| Answer» C. Both (A) and (B) | |
| 5. |
During load shedding |
| A. | system power factor is changed |
| B. | some loads are switched off |
| C. | system voltage is reduced |
| D. | system frequency is reduced Efficiency is the secondary consideration in |
| Answer» C. system voltage is reduced | |
| 6. |
Diversity factor has direct effect on the |
| A. | fixed cost of unit generated |
| B. | running cost of unit generated |
| C. | both (A) and (B) |
| D. | neither (A) nor (B) |
| Answer» B. running cost of unit generated | |
| 7. |
Which of the following power plants need the least period for installation ? |
| A. | Thermal power plant |
| B. | Diesel power plant |
| C. | Nuclear power plant |
| D. | Hydro-electric power plant |
| Answer» C. Nuclear power plant | |
| 8. |
Annual instalment towards depreciation reduces as rate of interest increases with |
| A. | sinking fund depreciation |
| B. | straight line depreciation |
| C. | reducing balances depreciation |
| D. | none of the above |
| Answer» B. straight line depreciation | |
| 9. |
Which plant can never have 100 percent load factor ? |
| A. | Peak load plant |
| B. | Base load plant |
| C. | Nuclear power plant |
| D. | Hydro electric plant |
| Answer» B. Base load plant | |
| 10. |
_______ industry has the least power consumption per tonne of product. |
| A. | Soap |
| B. | Sugar |
| C. | Vegetable oil |
| D. | Caustic soda |
| Answer» D. Caustic soda | |
| 11. |
The expected useful life of an hydroelectric power station is around |
| A. | 15 years |
| B. | 30 years |
| C. | 60 years |
| D. | 100 years |
| Answer» E. | |
| 12. |
Which of the following place is not associated with nuclear power plants in India ? |
| A. | Narora |
| B. | Tarapur |
| C. | Kota |
| D. | Benglore |
| Answer» E. | |
| 13. |
Annual operating expenditure of a power plant consists of |
| A. | fixed charges |
| B. | semi-fixed charges |
| C. | running charges |
| D. | all of the above |
| Answer» E. | |
| 14. |
The efficiency of a plant is of least concern when it is selected as |
| A. | peak load plant |
| B. | casual run plant |
| C. | either (A) or (B) |
| D. | base load plant |
| Answer» D. base load plant | |
| 15. |
Approximate estimation of power demand can be made by |
| A. | Load survey method |
| B. | Statistical methods |
| C. | Mathematical method |
| D. | All of the above |
| Answer» E. | |
| 16. |
Load curve is useful in deciding the |
| A. | operating schedule of generating units |
| B. | sizes of generating units |
| C. | total installed capacity of the plant |
| D. | all of the above |
| Answer» E. | |
| 17. |
Power plant having maximum demand more than the installed rated capacity will have utilisation factor |
| A. | equal to unity |
| B. | less than unity |
| C. | more than unity |
| D. | none of the above |
| Answer» D. none of the above | |
| 18. |
In two part tariff, variation in load factor will affect |
| A. | fixed charges |
| B. | operating or running charges |
| C. | both (A) and (B) |
| D. | either (A) or (B) |
| Answer» C. both (A) and (B) | |
| 19. |
In a distribution system, in order to improve power factor, the synchronous capacitors are installed |
| A. | at the receiving end |
| B. | at the sending end |
| C. | either (A) or (B) |
| D. | none of the above |
| Answer» B. at the sending end | |
| 20. |
Which of the following is the disadvantage of a synchronous condenser ? |
| A. | High maintenance cost |
| B. | Continuous losses in motor |
| C. | Noise |
| D. | All of the above |
| Answer» E. | |
| 21. |
A synchronous condenser is virtually which of the following? |
| A. | Induction motor |
| B. | Under excited synchronous motor |
| C. | Over excited synchronous motor |
| D. | D.C. generator |
| Answer» D. D.C. generator | |
| 22. |
Generators for peak load plants are usually designed for maximum efficiency at |
| A. | 25 to 50 percent full load |
| B. | 50 to 75 percent full load |
| C. | full load |
| D. | 25 percent overload |
| Answer» C. full load | |
| 23. |
Large capacity generators are invariably |
| A. | water cooled |
| B. | natural air cooled |
| C. | forced air cooled |
| D. | hydrogen cooled |
| Answer» E. | |
| 24. |
In ______ fuel transportation cost is least. |
| A. | nuclear power plants |
| B. | diesel generating plants |
| C. | steam power stations |
| D. | none of the above |
| Answer» B. diesel generating plants | |
| 25. |
Which of the following plants is almost inevitably used as base load plant ? |
| A. | Diesel engine plant |
| B. | Gas turbine plant |
| C. | Nuclear power plant |
| D. | Pumped storage plant |
| Answer» D. Pumped storage plant | |
| 26. |
Most efficient plants are normally used as |
| A. | peak load plants |
| B. | base load plants |
| C. | either (A) or (B) |
| D. | none of the above |
| Answer» C. either (A) or (B) | |
| 27. |
For high value of diversity factor, a power station of given installed capacity will be in a position to supply |
| A. | Less number of consumers |
| B. | More number of consumers |
| C. | Neither (A) nor (B) |
| D. | Either (A) or (B) |
| Answer» C. Neither (A) nor (B) | |
| 28. |
Can generate power at unpredictable or uncontrolled times, |
| A. | Solar power plant |
| B. | Tidal power plant |
| C. | Wind power plant |
| D. | Any of the above |
| Answer» E. | |
| 29. |
Salvage value of the plant is always |
| A. | positive |
| B. | negative |
| C. | zero |
| D. | any of the above |
| Answer» E. | |
| 30. |
Which of the following is not an operating cost ? |
| A. | Maintenance cost |
| B. | Fuel cost |
| C. | Salaries of high officials |
| D. | Salaries of operating staff |
| Answer» D. Salaries of operating staff | |
| 31. |
For any type of consumer the ideal tariff is |
| A. | two part tariff |
| B. | three part tariff |
| C. | block rate tariff |
| D. | any of the above |
| Answer» C. block rate tariff | |
| 32. |
Which of the following are not repayable after a stipulated period ? |
| A. | Shares |
| B. | Fixed deposits |
| C. | Cash certificates |
| D. | Bonds |
| Answer» B. Fixed deposits | |
| 33. |
A company can raise funds through |
| A. | fixed deposits |
| B. | shares |
| C. | bonds |
| D. | any of the above |
| Answer» E. | |
| 34. |
Maximum demand on a power plant is |
| A. | the greatest of all ?short time interval averaged? demand during a period |
| B. | instantaneous maximum value of kVA supplied during a period |
| C. | both (A) or (B) |
| D. | none of the above |
| Answer» B. instantaneous maximum value of kVA supplied during a period | |
| 35. |
In an interconnected system, the diversity factor of the whole system |
| A. | remains unchanged |
| B. | decreases |
| C. | increases |
| D. | none of the above |
| Answer» D. none of the above | |
| 36. |
Which of the following is the essential requirement of peak load plant? |
| A. | It should run at high speed |
| B. | It should produce high voltage |
| C. | It should be small in size |
| D. | It should be capable of starting quickly |
| Answer» E. | |
| 37. |
A power transformer is usually rated in |
| A. | kW |
| B. | kVAR |
| C. | kWh |
| D. | kVA |
| Answer» E. | |
| 38. |
Power plant is expected to have the longest life. |
| A. | Steam |
| B. | Diesel |
| C. | Hydroelectric |
| D. | Any of the above |
| Answer» D. Any of the above | |
| 39. |
Load curve helps in deciding |
| A. | total installed capacity of the plant |
| B. | sizes of the generating units |
| C. | operating schedule of generating units |
| D. | all of the above |
| Answer» E. | |
| 40. |
Is the reserved generating capacity available for service under emergency conditions which is not kept in operation but in working order, |
| A. | Hot reserve |
| B. | Cold reserve |
| C. | Spinning reserve |
| D. | Firm power |
| Answer» C. Spinning reserve | |
| 41. |
Annual depreciation of the plant it proportional to the earning capacity of the plant vide |
| A. | sinking fund depreciation |
| B. | straight line depreciation |
| C. | reducing balances depreciation |
| D. | none of the above |
| Answer» D. none of the above | |
| 42. |
For a power plant which of the following constitutes running cost? |
| A. | Cost of wages |
| B. | Cost of fuel |
| C. | Cost of lubricants |
| D. | All of the above |
| Answer» E. | |
| 43. |
________ will be least affected due to charge in supply voltage frequency. |
| A. | Electric clock |
| B. | Mixer grinder |
| C. | Ceiling fan |
| D. | Room heater |
| Answer» E. | |
| 44. |
________ is invariably used for peak load |
| A. | Nuclear power plant |
| B. | Steam turbine plant |
| C. | Pumped storage plant |
| D. | None of the above |
| Answer» D. None of the above | |
| 45. |
For a diesel generating station the useful life is expected to be around |
| A. | 15 to 20 years |
| B. | 20 to 50 years |
| C. | 50 to 75 years |
| D. | 75 to 100 years |
| Answer» B. 20 to 50 years | |
| 46. |
public sector undertaking is associated with erection and sometimes running of thermal power plants |
| A. | NTPC |
| B. | SAIL |
| C. | BEL |
| D. | BHEL |
| Answer» B. SAIL | |
| 47. |
Generating capacity connected to the bus bars and ready to take load when switched on is known as |
| A. | firm power |
| B. | cold reserve |
| C. | hot reserve |
| D. | spinning reserve |
| Answer» E. | |
| 48. |
Load factor of a power station is defined as |
| A. | maximum demand/average load |
| B. | average load x maximum demand |
| C. | average load/maximum demand |
| D. | (average load x maximum demand)172 |
| Answer» D. (average load x maximum demand)172 | |
| 49. |
The load factor of domestic load is usually |
| A. | 10 to 15% |
| B. | 30 to 40% |
| C. | 50 to 60% |
| D. | 60 to 70% |
| Answer» B. 30 to 40% | |
| 50. |
Load factor of a power station is generally |
| A. | equal to unity |
| B. | less than unity |
| C. | more than unity |
| D. | equal to zero Diversity factor is always |
| Answer» C. more than unity | |