MCQOPTIONS
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MCQOPTIONS
This section includes 70 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. |
_______ are simple heat exchangers for imparting additional energy to steam for given pressure. |
| A. | Superheaters |
| B. | Economizers |
| C. | Draught systems |
| D. | None of the above |
| Answer» B. Economizers | |
| 2. |
Match List – I with List – IIList – IList – IIa. Base load1. nuclear power plantb. Peak load2. dielsel power plant 3. gas power plant |
| A. | 1-a, 2-b, 3-b |
| B. | 1-b, 2-b, 3-b |
| C. | 1-a, 2-b, 3-a |
| D. | 1-a, 2-a, 3-b |
| Answer» B. 1-b, 2-b, 3-b | |
| 3. |
Public Sector Undertaking Associated with erection and commissioning of thermal power plants in India is: |
| A. | Bharat Coking Coal Ltd. |
| B. | National Thermal Power Corporation Ltd. |
| C. | Indian Electricity Authority |
| D. | Department of Science and Technology |
| Answer» C. Indian Electricity Authority | |
| 4. |
A steam power station has an overall efficiency of 20% and 0.5 kg of coal is burnt per kWh of electrical energy generated. Calculate the calorific value of the fuel. Heat equivalent of 1 kWh is 860 kcal. |
| A. | 8600 kcal/kg |
| B. | 344 kcal/kg |
| C. | 860 kcal/kg |
| D. | 2150 kcal/kg |
| Answer» B. 344 kcal/kg | |
| 5. |
If a motor-pump set lifts 100 litres of water through a height of 10 m in 1.5 min, then the output power required by the pump will be (Take 1 lit = 1 kg) |
| A. | 0.109 kW |
| B. | 1.102 kW |
| C. | 0.5 kW |
| D. | 10.9 kW |
| Answer» B. 1.102 kW | |
| 6. |
High Head Power Plant has a turbine as a common prime mover. |
| A. | Francis |
| B. | Pelton Wheel |
| C. | Kaplan |
| D. | Kaplan/Pelton Wheel |
| Answer» C. Kaplan | |
| 7. |
ISO 3046 (Part 5) establishes that the general requirement for DG set is |
| A. | Torsional vibration |
| B. | Speed |
| C. | Power |
| D. | None of the above |
| Answer» B. Speed | |
| 8. |
A diesel power station has fuel consumption of 0.2 kg per kWh. If the calorific value of diesel is 11000 kcal per kg, overall efficiency of power station is |
| A. | 43.3% |
| B. | 65.5% |
| C. | 39.2% |
| D. | 25.6% |
| Answer» D. 25.6% | |
| 9. |
Choose the INCORRECT statement with respect to solid fuels and liquid fuels used in power generation. |
| A. | Solid fuels have higher percentage of moisture, and consequently, they burn with great difficulty. |
| B. | Liquid flues require special types of burners for burning. |
| C. | Handling of solid fuels is easier, and they require less storage space. |
| D. | The waste product of solid fuels is a large quantity of ash. |
| Answer» D. The waste product of solid fuels is a large quantity of ash. | |
| 10. |
Baseload plants supply power at |
| A. | Low capital cost and low running cost |
| B. | Low capital cost and high running cost |
| C. | High capital cost and high running cost |
| D. | High capital cost and low running cost |
| Answer» E. | |
| 11. |
Depreciation charges are high in the case of |
| A. | Thermal plant |
| B. | Diesel plant |
| C. | Hydroelectric plant |
| D. | Wind power plant |
| Answer» B. Diesel plant | |
| 12. |
A normal DG Set must be CPCB compliant for noise as below: |
| A. | 75 dB at 1 metre |
| B. | 80 dB at 1 metre |
| C. | 85 dB at 1 metre |
| D. | 90 dB at 1 metre |
| Answer» B. 80 dB at 1 metre | |
| 13. |
Operation of following wind turbine is independent of wind direction. |
| A. | Horizontal axis turbine |
| B. | Vertical axis turbine |
| C. | Angular horizontal axis turbine |
| D. | None of the options available |
| Answer» C. Angular horizontal axis turbine | |
| 14. |
A diesel power station has fuel consumption of 0.28kg per kWh, the calorific value of fuel being 10, 000 kcal/kg. Determine the overall efficiency |
| A. | 23.5% |
| B. | 50.2% |
| C. | 40.2% |
| D. | 30.7% |
| Answer» E. | |
| 15. |
In a hydro – electric power plant, _______ turbine is used for high head and low discharge. |
| A. | Pelton |
| B. | Kaplan |
| C. | Deriaz |
| D. | Francis |
| Answer» B. Kaplan | |
| 16. |
For under water movement of a submarine the power is provided by: |
| A. | tidal energy |
| B. | MHD generator |
| C. | batteries |
| D. | Thermionic generator |
| Answer» D. Thermionic generator | |
| 17. |
Forced draft fan handling which type of air |
| A. | Cold air |
| B. | Hot air |
| C. | Flue gas only |
| D. | Fresh air |
| Answer» E. | |
| 18. |
Capital cost on a nuclear plant is: |
| A. | equal to |
| B. | low |
| C. | Moderate |
| D. | Very high |
| Answer» E. | |
| 19. |
Overall thermal efficiency of a steam power station is in the range |
| A. | 18 – 24% |
| B. | 30 – 40% |
| C. | 44 – 62% |
| D. | 68 – 79% |
| Answer» C. 44 – 62% | |
| 20. |
In a biogas plant, pH of the slurry is kept between: |
| A. | 4.5-5.5 |
| B. | 5.5-6.5 |
| C. | 6.5-8.5 |
| D. | 8.5-10.5 |
| Answer» D. 8.5-10.5 | |
| 21. |
Calculate the overall efficiency of the steam thermal power plant, if boiler efficiency is 85%, turbine efficiency is 40% and alternator efficiency is 95% |
| A. | 73.3% |
| B. | 32.3% |
| C. | 43.5% |
| D. | 25.3% |
| Answer» C. 43.5% | |
| 22. |
Generators with the operating speeds of 3000, 3000 and 300 rpm are appreciate in ________ power plants, respectively. |
| A. | hydro, nuclear and thermal |
| B. | thermal, hydro and nuclear |
| C. | thermal, nuclear and hydro |
| D. | hydro, thermal and nuclear |
| Answer» D. hydro, thermal and nuclear | |
| 23. |
Puga Valley in Ladakh is suitable for which of the following power generation? |
| A. | Wind |
| B. | Solar |
| C. | Geothermal |
| D. | All of these |
| Answer» D. All of these | |
| 24. |
For the protection of power station buildings against direct strokes the requirements are: |
| A. | Interception and conduction |
| B. | Interception, conduction, and dissipation |
| C. | Interception, conduction, dissipation, and reflection |
| D. | None of these |
| Answer» C. Interception, conduction, dissipation, and reflection | |
| 25. |
Penstocks are used in _____ power station. |
| A. | Thermal |
| B. | Nuclear |
| C. | Wind |
| D. | Hydro-electric |
| Answer» E. | |
| 26. |
Bus bar temperature rise in a DG Set is proportional to |
| A. | Current (I) |
| B. | Square of current (I2) |
| C. | Voltage (V) |
| D. | All of the above |
| Answer» C. Voltage (V) | |
| 27. |
Identify the correct statement regarding a nuclear power plant. |
| A. | Graphite is used as an electrode |
| B. | Graphite is used as a coolant |
| C. | Graphite is used as a moderator |
| D. | Graphite is used as fuel |
| Answer» D. Graphite is used as fuel | |
| 28. |
___________ is a tube that brings water to turbines. |
| A. | Spillway |
| B. | Penstock |
| C. | Trash rack |
| D. | Forebay |
| Answer» C. Trash rack | |
| 29. |
Choose the correct schematic arrangement of the nuclear power station. |
| A. | A nuclear reactor, heat exchanger, steam turbine, alternator |
| B. | Steam turbine, alternator, heat exchanger, nuclear reactor |
| C. | Steam turbine, heat exchanger, alternator, nuclear reactor |
| D. | Alternator, heat exchanger, nuclear reactor, steam turbine |
| Answer» B. Steam turbine, alternator, heat exchanger, nuclear reactor | |
| 30. |
Generators of peak load plants are usually designed for maximum efficiency at |
| A. | Full load |
| B. | 25 to 50% full load |
| C. | 50 to 75% full load |
| D. | 25% overload |
| Answer» D. 25% overload | |
| 31. |
___________ are often employed to eliminate dusty air. |
| A. | Industrial fan |
| B. | Exhaust fan |
| C. | Pedestal fan |
| D. | Table fan |
| Answer» C. Pedestal fan | |
| 32. |
In the current situation, which of the following fuels is used more in electrical energy generation? |
| A. | Natural gas |
| B. | Coal |
| C. | Nuclear energy |
| D. | Wind energy |
| Answer» C. Nuclear energy | |
| 33. |
In hydroelectric power station Kaplan turbine is used for _________. |
| A. | Medium head |
| B. | All of these |
| C. | High head |
| D. | Low head |
| Answer» E. | |
| 34. |
According to Betz theory, the maximum possible power coefficient is 16/27 and 59% efficiency is the best conventional wind turbine can do in extracting power from the wind becausea. 100% efficiency is not possible due to fluid mechanics of windb. 100% efficiency can be extracted then the flow of air would be reduced to complete stop and no velocity would remain available to sustain flow through extraction mechanism. |
| A. | a is true, b is false |
| B. | Both a and b are true |
| C. | a is false, b is true |
| D. | Both a and b are false |
| Answer» C. a is false, b is true | |
| 35. |
Consider the following statements with respect to thermal power stations. State whether these statements are true or false.(a) They pollute the atmosphere due to the production of a large amount of smoke and fumes.(b) They are costlier in running cost as compared to hydroelectric plants.(c) They require a larger space as compared to hydroelectric power stations for the same capacity of generation. |
| A. | (a) True, (b) True and (c) False |
| B. | (a) False, (b) True and (c) True |
| C. | (a) False, (b) True and (c) False |
| D. | (a) True, (b) True and (c) True |
| Answer» B. (a) False, (b) True and (c) True | |
| 36. |
Pollution due to Tidal Energy generation is usually: |
| A. | Zero |
| B. | Low |
| C. | Moderate |
| D. | High |
| Answer» B. Low | |
| 37. |
A pulverized coal boiler produces approximately _____ fly ash and ______ bottom ash. |
| A. | 60 %; 40 % |
| B. | 50 %; 50 % |
| C. | 80 %; 20 % |
| D. | 70 %; 30 % |
| Answer» D. 70 %; 30 % | |
| 38. |
Economizer is used for |
| A. | superheating the stream |
| B. | pre-heating of the feed water |
| C. | pre-heating the air |
| D. | condensing the exhaust steam of the engine |
| Answer» C. pre-heating the air | |
| 39. |
_________ power plant is the plant which uses the non-conventional source of energy. |
| A. | Hydroelectric |
| B. | Thermal |
| C. | Wind |
| D. | Nuclear |
| Answer» D. Nuclear | |
| 40. |
P = QHg is the water power equation. Head ‘H’ is measured in meter, ‘g’ gravity constant is measured in meter/second square, then the measuring unit of ‘Q’, flow rate of water is: |
| A. | Meter per hour |
| B. | Meter per second |
| C. | Cubic meter per second |
| D. | Square meter per second |
| Answer» D. Square meter per second | |
| 41. |
_____ gas is majorly produced by anaerobic decomposition of human or animal excreta. |
| A. | Methane |
| B. | Carbon dioxide |
| C. | Nitrogen dioxide |
| D. | Ammonia |
| Answer» B. Carbon dioxide | |
| 42. |
Compared to turbines in the conventional coal-fired thermal stations, nuclear power plant turbines use steam at |
| A. | higher pressure and higher temperature |
| B. | lower pressure and lower temperature |
| C. | higher pressure and lower temperature |
| D. | lower pressure and higher temperature |
| Answer» C. higher pressure and lower temperature | |
| 43. |
In a biogas plant, the dome/gas collector is usually in shape. |
| A. | conical |
| B. | hemispherical |
| C. | cuboidal |
| D. | pyramidal |
| Answer» C. cuboidal | |
| 44. |
BEE stands for |
| A. | Board of Energy Efficiency |
| B. | Bureau of Energy Efficiency |
| C. | Branch of Energy Efficiency |
| D. | None of the above |
| Answer» C. Branch of Energy Efficiency | |
| 45. |
Comment on the speed of generators of Chandrapur Super Thermal Power Station and Koyana Hydro Power Station. |
| A. | Same speed of both power station generators |
| B. | Chandrapur Super Thermal Power Station generator speed is higher |
| C. | Koyana Hydro Power Station speed is higher |
| D. | Cannot comment |
| Answer» C. Koyana Hydro Power Station speed is higher | |
| 46. |
Hydraulic power of a pump is |
| A. | proportional to density of fluid |
| B. | inversely proportional to density of fluid |
| C. | not affected by density of fluid |
| D. | proportional to square of density of fluid |
| Answer» B. inversely proportional to density of fluid | |
| 47. |
A modern coal-fired thermal power station consumes about ________ of its power for supplying to the auxiliaries. |
| A. | 10% |
| B. | 40% |
| C. | 20% |
| D. | 30% |
| Answer» B. 40% | |
| 48. |
In steam turbine plant, extraction of heat from flue gases to heat feed water of the boiler is done by |
| A. | Air preheater |
| B. | Superheater |
| C. | Economiser |
| D. | Condenser |
| Answer» D. Condenser | |
| 49. |
Compared to the salient-pole Hydroelectric generators, the steam and the gas-turbine generators have cylindrical rotors for |
| A. | Better air-circulation in the machine |
| B. | Reducing the eddy-current losses in the rotor |
| C. | Accommodating larger number of terms in the field winding |
| D. | Providing higher mechanical strength against the centrifugal stress |
| Answer» E. | |
| 50. |
Flat rate tariff is charged on what basis? |
| A. | Connected load |
| B. | Units consumed |
| C. | Maximum demand |
| D. | Both (a) and (b) |
| Answer» C. Maximum demand | |