MCQOPTIONS
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MCQOPTIONS
This section includes 47 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. |
Air pollution due to smoke around a thermal power station can be reduced by installing |
| A. | Induced draft fan |
| B. | Super heater |
| C. | Economizer |
| D. | Electrostatic precipitator |
| Answer» E. | |
| 2. |
A hydroelectric generating plant is supplied from a reservoir of capacity 3.6 × 106 m3 at a head of 100 m. Find the total energy available in kWh if the overall efficiency is 75% |
| A. | 63675 |
| B. | 35750 |
| C. | 735750 |
| D. | 536750 |
| Answer» D. 536750 | |
| 3. |
In a steam power plant, which of the following is NOT an artificial draught? |
| A. | Chimney draught |
| B. | Induced draught |
| C. | Forced draught |
| D. | Balanced draught |
| Answer» B. Induced draught | |
| 4. |
In hydro-electric power plants, ______ reduces water hammer effect in penstock |
| A. | Spill way |
| B. | Trash rack |
| C. | Surge tank |
| D. | Forebay |
| Answer» D. Forebay | |
| 5. |
A boiling water reactor uses which of the following as fuel? |
| A. | U234 |
| B. | U235 |
| C. | Enriched uranium |
| D. | Plutonium |
| Answer» D. Plutonium | |
| 6. |
Identify the given general symbol shown: |
| A. | Ceiling Fan |
| B. | Exhaust fan |
| C. | Bracket Fan |
| D. | Fan Regulator |
| Answer» C. Bracket Fan | |
| 7. |
Kovvada nuclear plant is being set up in:- |
| A. | Andhra Pradesh |
| B. | Chattisgarh |
| C. | Karnataka |
| D. | Chennai |
| Answer» B. Chattisgarh | |
| 8. |
Find the nearest Horsepower of single phase motor working at 230 V, 50 Hz for pumping 1200 litres of water to a height of 30 m. The time taken to pump the water is 15 minutes. The efficiency of the motor is 80%. |
| A. | 1.5 HP |
| B. | 0.98 HP |
| C. | 0.65 HP |
| D. | 0.82 HP |
| Answer» D. 0.82 HP | |
| 9. |
In hydro-electric plants the type of alternator used is: |
| A. | Turbo generator |
| B. | Non salient pole |
| C. | Salient pole |
| D. | Steam turbine generator |
| Answer» D. Steam turbine generator | |
| 10. |
A hydroelectric generating station is supplied from a reservoir of capacity 6 million m3 at a head of 170m. Determine the potential energy stored in this water. |
| A. | 1010 J |
| B. | 109 J |
| C. | 108 J |
| D. | 1012 J |
| Answer» E. | |
| 11. |
A large hydropower station has a head of 324 metre and an average flow of 1370 m3 / sec. The available hydraulic power from this station will be: |
| A. | 4.35 MW |
| B. | 4.15 MW |
| C. | 4.47 MW |
| D. | 4.73 MW |
| Answer» B. 4.15 MW | |
| 12. |
In a steam nozzle, heat supplied to steam during the expansion process equals |
| A. | zero |
| B. | change in kinetic energy |
| C. | work done |
| D. | heat drop |
| Answer» B. change in kinetic energy | |
| 13. |
Kakarpar Atomic Energy Station is located in the state of ______. |
| A. | Gujarat |
| B. | Rajasthan |
| C. | Maharashtra |
| D. | Karnataka |
| Answer» B. Rajasthan | |
| 14. |
Established capacity of Idukki hydroelectric project |
| A. | 740 Megawatt |
| B. | 750 Megawatt |
| C. | 800 Megawatt |
| D. | 780 Megawatt |
| Answer» E. | |
| 15. |
A diesel power station has fuel consumption of 0.215 kg per kWh, the calorific value of fuel being 10,000 kcal / kg. Determine the overall efficiency. |
| A. | 40% |
| B. | 30% |
| C. | 45% |
| D. | 55% |
| Answer» B. 30% | |
| 16. |
If it is known that the decay constant of radium is 1.3566 × 10-11 s-1 then find its half-life. (Given atomic mass of radium is 226.095 amu) |
| A. | 1000 year |
| B. | 1620 year |
| C. | 1785 year |
| D. | 1467 year |
| Answer» C. 1785 year | |
| 17. |
Economisers are used to heat: |
| A. | condensed steam |
| B. | air |
| C. | steam |
| D. | feed water |
| Answer» E. | |
| 18. |
In steam power plants, the pump handles liquid which has a very small specific volume and the turbine handles vapor whose volume is many times larger. Therefore work output of turbine is ____ the work input to pump. |
| A. | many times larger than |
| B. | many times smaller than |
| C. | equal to |
| D. | none of these |
| Answer» B. many times smaller than | |
| 19. |
Natural draught in a steam power plant is produced by _________. |
| A. | Chimneys |
| B. | Fans |
| C. | Steam jets |
| D. | Mechanical system |
| Answer» B. Fans | |
| 20. |
In which district is the ‘Shree Singaji Thermal Power Project’ located? |
| A. | Shahdol |
| B. | Khandwa |
| C. | Burhanpur |
| D. | Rewa |
| Answer» C. Burhanpur | |
| 21. |
In which district is the Jaitapur Atomic Power Project proposed? |
| A. | Sindhudurg |
| B. | Ratnagiri |
| C. | Raigad |
| D. | Palghar |
| Answer» C. Raigad | |
| 22. |
A steam power station has an overall efficiency of 25%, and 0.5 kg of coal is burnt per kWh of electrical energy generated. Determine the calorific value of fuel.(Take heat equivalent of 1 kWh as 860 kcal) |
| A. | 1720 kcal/kg |
| B. | 6880 kcal/kg |
| C. | 3400 kcal/kg |
| D. | 4650 kcal/kg |
| Answer» C. 3400 kcal/kg | |
| 23. |
Directions: It consists of two statements, one labelled as the ‘Statement (I)’ and the other as ‘Statement (II). Examine these two statements carefully and select the answer using the codes given below:Statement (I): In high head hydel stations, the action of governor due to sudden change in load, changes the water admitted to turbine blades leading to water hammering effect on penstocks.Statement (II): A surge tank in high head hydel stations is used to absorb the flow variations. |
| A. | Both Statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I) |
| B. | Both Statement (I) and Statement (II) are individually true but Statement (II) is not the correct explanation of Statement (I) |
| C. | Statement (I) is true but Statement (II) is false |
| D. | Statement (I) is false but Statement (II) is true |
| Answer» B. Both Statement (I) and Statement (II) are individually true but Statement (II) is not the correct explanation of Statement (I) | |
| 24. |
In nuclear power station, moderator is used to, |
| A. | absorb neutrons |
| B. | reduce the speed of neutrons |
| C. | accelerate the speed of neutrons |
| D. | stop chain reactions |
| Answer» C. accelerate the speed of neutrons | |
| 25. |
A surge tank is provided in hydropower schemes to |
| A. | strengthen the penstocks |
| B. | reduce water hammer pressure |
| C. | reduce frictional losses in the system |
| D. | increase net head |
| E. | increase efficiency of power generation |
| Answer» C. reduce frictional losses in the system | |
| 26. |
A generating station which converts heat energy from coal combustion into electrical energy is a __________. |
| A. | Wind turbine |
| B. | Hydro power station |
| C. | Nuclear power station |
| D. | Thermal power station |
| Answer» E. | |
| 27. |
A closed container is termed as boiler if its volume exceeds _________ litres. |
| A. | 10 |
| B. | 50 |
| C. | 100 |
| D. | 22.75 |
| Answer» E. | |
| 28. |
Kakrapar Atomic Power Station is located in _______. |
| A. | Madhya Pradesh |
| B. | Tamil Nadu |
| C. | Uttarakhand |
| D. | Gujarat |
| Answer» E. | |
| 29. |
Kakrapar Atomic Power Station is located in____ |
| A. | Tamil Nadu |
| B. | Gujarat |
| C. | Madhya Pradesh |
| D. | Uttarakhand |
| Answer» C. Madhya Pradesh | |
| 30. |
A hydro-electric generating station is supplied from a reservoir of capacity 5 × 106 cubic meter at a head of 200 meter. Find the total energy available in kWh, if the overall efficiency is 75%. |
| A. | 2 × 106 kWh |
| B. | 2 × 105 kWh |
| C. | 2 × 107 kWh |
| D. | 2 × 104 kWh |
| Answer» B. 2 × 105 kWh | |
| 31. |
A steam power station has a thermal efficiency of 30% and electrical efficiency of 90%, what is the overall efficiency of the station? |
| A. | 27% |
| B. | 33% |
| C. | 90% |
| D. | 30% |
| Answer» B. 33% | |
| 32. |
A base load power station of capacity 35 MW has annual output of 150 × 106 kWh. The plant capacity factor of the power plant is |
| A. | 68% |
| B. | 35% |
| C. | 49% |
| D. | 25% |
| Answer» D. 25% | |
| 33. |
In a Steam power plant, _________ heats the feed water on its way to the boiler by deriving heat from the flue gases. |
| A. | Superheater |
| B. | Economizer |
| C. | Preheater |
| D. | Turbine |
| Answer» C. Preheater | |
| 34. |
A generating station which converts heat energy of coal combustion into electrical energy is classified as: |
| A. | hydroelectric power plant |
| B. | Thermal power plant |
| C. | nuclear power plant |
| D. | solar power plant |
| Answer» C. nuclear power plant | |
| 35. |
A 100 MW steam station uses coal of calorific value 6400 kcal/kg. Thermal efficiency of the station is 30% and electrical efficiency is 92%. Find the overall efficiency of the plant. |
| A. | 92% |
| B. | 30% |
| C. | 27.6% |
| D. | 62% |
| Answer» D. 62% | |
| 36. |
In a steam power plant, the condensate from the condenser is used: |
| A. | to cool the generator |
| B. | as feed water to the boiler |
| C. | to cool the turbine |
| D. | to cool the boiler |
| Answer» C. to cool the turbine | |
| 37. |
A hydroelectric reservoir can supply water continuously at a rate of 100 m3/s. The head is 75 m. The theoretical power that can be developed is (in MW). |
| A. | 73.5 |
| B. | 65.7 |
| C. | 68.5 |
| D. | 70.8 |
| Answer» B. 65.7 | |
| 38. |
A simple steam power cycle receives 100,000 kJ/min as heat transfer from hot combustion gases and rejects 66,000 kJ/min as heat transfer to the environment. If the pump power required is 1400 kJ/min, the thermal efficiency of the cycle and turbine power output is |
| A. | 51.5% and 590 kW |
| B. | 34% and 590 kW |
| C. | 51.5% and 566.6 kW |
| D. | 34% and 566.6 kW |
| Answer» C. 51.5% and 566.6 kW | |
| 39. |
Rammam hydroelectric power project is located in |
| A. | Purulia |
| B. | Bankura |
| C. | Jalpaiguri |
| D. | Darjeeling |
| Answer» E. | |
| 40. |
Air forced into the tower in mechanical draft cooling towers by using: |
| A. | Spray nozzles |
| B. | Propellers |
| C. | Louvers |
| D. | Deckings |
| Answer» C. Louvers | |
| 41. |
In thermal power plants, the function of economizer is to: |
| A. | Heat steam from boiler |
| B. | Heat feed water using flue gas |
| C. | Heat air fuel mixture |
| D. | Heat steam taken from turbine outlets |
| Answer» C. Heat air fuel mixture | |
| 42. |
Impulse turbines are used in: |
| A. | Very low head plants |
| B. | High head plants |
| C. | Medium head plants |
| D. | Low head plants |
| Answer» C. Medium head plants | |
| 43. |
In hydroelectric plant, surge tank is provided for the protection of the ________. |
| A. | fuel tank |
| B. | dam |
| C. | power house |
| D. | penstock |
| Answer» E. | |
| 44. |
In thermal power plants, steam energy is converted into mechanical energy by means of a: |
| A. | Boiler |
| B. | Condenser |
| C. | Steam turbine |
| D. | Reactor |
| Answer» D. Reactor | |
| 45. |
If K is the ratio of the rate of production of neutrons to the rate of loss of neutrons, the reactor is called a critical reactor, when |
| A. | K = 0 |
| B. | 0 < K < 1 |
| C. | K = 1 |
| D. | K > 1 |
| Answer» D. K > 1 | |
| 46. |
For which engineering purposes, uranium, thorium, plutonium, zirconium, beryllium, niobium and their alloys are primarily used? |
| A. | Electronic Engineering |
| B. | Nuclear Engineering |
| C. | Telecommunication Engineering |
| D. | Computer Engineering |
| Answer» C. Telecommunication Engineering | |
| 47. |
A thermal power plant generates the power of 1000 MW. 900 × 107 kJ/h of energy. The rate at which heat is rejected from the this power plant will be: |
| A. | 500 MW |
| B. | 1000 MW |
| C. | 250 MW |
| D. | 1500 MW |
| Answer» E. | |