MCQOPTIONS
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MCQOPTIONS
This section includes 102 Mcqs, each offering curated multiple-choice questions to sharpen your Power Plant knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
What are the components of a Steam Power Plant? |
| A. | Evaporator, Condenser, Boiler, Expansion valve |
| B. | Evaporator, Condenser, Boiler, Turbine |
| C. | Boiler, Turbine, Condenser, Pump |
| D. | Boiler, Turbine, Pump, Expansion valve |
| Answer» D. Boiler, Turbine, Pump, Expansion valve | |
| 2. |
What kind of a process does a ‘Steam Power Plant’ undergoes? |
| A. | Adiabatic |
| B. | Cyclic |
| C. | Irreversible |
| D. | Expansion |
| Answer» C. Irreversible | |
| 3. |
What kind of energy output is obtained from a ‘Steam Power Plant’? |
| A. | Heat energy |
| B. | Sound energy |
| C. | Electricity |
| D. | Thermal energy |
| Answer» D. Thermal energy | |
| 4. |
Which of these is an output of a ‘Furnace’? |
| A. | Fuel gas |
| B. | Air |
| C. | Flue gases |
| D. | Water Vapor |
| Answer» D. Water Vapor | |
| 5. |
Which of these is a ‘working fluid’ in liquid phase? |
| A. | Water |
| B. | Steam |
| C. | Mercury |
| D. | Oxygen |
| Answer» B. Steam | |
| 6. |
Which of these is a ‘fissile fuel’? |
| A. | Thorium |
| B. | Carbon |
| C. | Potassium |
| D. | Graphite |
| Answer» B. Carbon | |
| 7. |
What effect does the heating of feedwater by steam 'bled' from the turbine has on the Rankine Cycle? |
| A. | it rankinises the Rankine Cycle |
| B. | it carnotinises the Rankine Cycle |
| C. | it reheats the Rankine Cycle |
| D. | none of the mentioned |
| Answer» C. it reheats the Rankine Cycle | |
| 8. |
Which of the following material can be used as a moderator? |
| A. | Beryllium |
| B. | Graphite |
| C. | Heavy water |
| D. | All of the mentioned |
| Answer» E. | |
| 9. |
Rankine cycle efficiency of a good Steam Power Plant may be in the range of? |
| A. | 15 to 20% |
| B. | 35 to 45% |
| C. | 70 to 80% |
| D. | 90 to 95% |
| Answer» C. 70 to 80% | |
| 10. |
What kind of a process does a 'Steam Power Plant' undergoes? |
| A. | Adiabatic |
| B. | Cyclic |
| C. | Irreversible |
| D. | Expansion |
| Answer» C. Irreversible | |
| 11. |
Steam Power Plants are more popular in electric power generation because |
| A. | Work output of turbine is very large than work input to the pump |
| B. | Work output of turbine is very small than work input to the pump |
| C. | Work output of turbine is equal to work input to the pump |
| D. | None of the mentioned. |
| Answer» B. Work output of turbine is very small than work input to the pump | |
| 12. |
Which of the following diagrams are used while analyzing the effect of superheat & Inlet Pressure on mean temperature of heat addition? |
| A. | P-V diagram |
| B. | T-S diagram |
| C. | P-T diagram |
| D. | V-T diagram |
| Answer» C. P-T diagram | |
| 13. |
When is a drain-cooler used? |
| A. | when the extracted steam upon condensation gets subcooled |
| B. | when the extracted steam upon subcooling gets condensed |
| C. | the extracted stream has no dependence on drain-cooler |
| D. | none of the mentioned |
| Answer» B. when the extracted steam upon subcooling gets condensed | |
| 14. |
Which one of the following is an advantage of reheat cycle |
| A. | the size of the Low pressure (LP) turbine blades is reduced because specific volume is reduced by 7 to 8% |
| B. | the reheating reduce 4 to 5% fuel consumption with a corresponding reduction in the fuel handling |
| C. | lower steam pressures and temperatures and less costly materials can be used to obtain the required thermal performance |
| D. | all of the mentioned |
| Answer» E. | |
| 15. |
Ideal 'Rankine Cycle' is a __________ process. |
| A. | Reversible |
| B. | Irreversible |
| C. | Both of the mentioned |
| D. | None of the mentioned |
| Answer» B. Irreversible | |
| 16. |
What is the actual turbine inlet temperature in Rankine cycle? |
| A. | 700C |
| B. | 800C |
| C. | 550C |
| D. | 1150C |
| Answer» D. 1150C | |
| 17. |
The heat transfer taking place in the turbine is? |
| A. | irreversible |
| B. | reversible |
| C. | both of the mentioned |
| D. | none of the mentioned |
| Answer» C. both of the mentioned | |
| 18. |
The initial pressure of a Watt's Beam Engine is about? |
| A. | 1 bar |
| B. | 2 bar |
| C. | 3 bar |
| D. | 4 bar |
| Answer» C. 3 bar | |
| 19. |
The number of feedwater heaters required in a Watt's Beam Engine is? |
| A. | 0 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» B. 4 | |
| 20. |
The steam power plant is a bulk energy converter where fuel energy is converted to? |
| A. | heat energy |
| B. | electrical energy |
| C. | chemical energy |
| D. | none of the mentioned |
| Answer» C. chemical energy | |
| 21. |
Which of these shows the formula for the efficiencies of the auxiliaries n1? |
| A. | n1 = (net power transmitted by the generator x gross power produced by the plant) |
| B. | n1 = (net power transmitted by the generator / gross power input to the plant) |
| C. | n1 = (net power transmitted by the generator / gross power produced by the plant) |
| D. | n1 = (net power transmitted by the generator / gross power transferred by the plant) |
| Answer» D. n1 = (net power transmitted by the generator / gross power transferred by the plant) | |
| 22. |
The number of heaters for a plant is fixed by? |
| A. | Mass Balance |
| B. | Energy balance |
| C. | Heat balance |
| D. | None of the mentioned. |
| Answer» C. Heat balance | |
| 23. |
Efficiency gain follows the law of? |
| A. | diminishing forward motion |
| B. | increasing return |
| C. | decreasing return |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 24. |
Location of low pressure heaters |
| A. | after the deaerator |
| B. | before the deaerator |
| C. | middle of deaerator |
| D. | depends on pressure conditions |
| Answer» B. before the deaerator | |
| 25. |
Feedwater heaters are of two types, they are |
| A. | natural and forced |
| B. | saturated and non saturated |
| C. | open and close |
| D. | water driven and steam driven |
| Answer» D. water driven and steam driven | |
| 26. |
Which of the following is a good medium for constant temperature heating? |
| A. | Water |
| B. | Steam |
| C. | Coolant |
| D. | Diesel |
| Answer» C. Coolant | |
| 27. |
In the T-S diagram, the process of heating from condenser to boiler saturation temperature when the number of turbine extraction stages are finite is? |
| A. | Reversible |
| B. | Irreversible |
| C. | Adiabatic |
| D. | None of the mentioned |
| Answer» C. Adiabatic | |
| 28. |
A simple Rankine cycle operates the Boiler at 3 MPa with an outlet temperature of 350°C and the Condenser at 50 kPa. Assuming ideal operation and processes, what is the thermal efficiency of this cycle? |
| A. | 7.7 |
| B. | 17.7 |
| C. | 27.7 |
| D. | 37.7 |
| Answer» D. 37.7 | |
| 29. |
The relation between the steam rate of ideal regenerative cycle & steam rate of rankine cycle is? |
| A. | steam rate of ideal regenerative cycle = steam rate of rankine cycle |
| B. | steam rate of ideal regenerative cycle > steam rate of rankine cycle |
| C. | steam rate of ideal regenerative cycle < steam rate of rankine cycle |
| D. | no relation |
| Answer» C. steam rate of ideal regenerative cycle < steam rate of rankine cycle | |
| 30. |
A Sterling engine uses an energy source whose temperature is 727°C and an energy sink whose temperature is 27°C. How much heat must be added to the engine to produce 1 unit of work? |
| A. | 1.1 |
| B. | 1.19 |
| C. | 1.43 |
| D. | 2 |
| Answer» D. 2 | |
| 31. |
The electricity fraction of total energy output if W1 and Q1 represents the turbine work and heat output is given by? |
| A. | W1 / (W1 + Q1) |
| B. | W1 / (W1 – Q1) |
| C. | W1 / (W1Q1) |
| D. | W1 / Q1 |
| Answer» B. W1 / (W1 – Q1) | |
| 32. |
" A simple Brayton cycle has a pressure ratio of 5 and a maximum temperature of 900 K. Air enters the compressor at 100 kPa, 300 K. Based upon cold-air standard analysis assumptions, the back-work ratio of this cycle is:" |
| A. | 0.23 |
| B. | 0.53 |
| C. | 0.48 |
| D. | 0.36 |
| Answer» C. 0.48 | |
| 33. |
Which of these factors don't cause Internal Irreversibility of a Rankine cycle? |
| A. | Throttling |
| B. | Mixing |
| C. | Fluid Friction |
| D. | Fluid flow |
| Answer» E. | |
| 34. |
Closed heaters are? |
| A. | horizontal |
| B. | vertical |
| C. | inclined |
| D. | depends on requirement |
| Answer» E. | |
| 35. |
The components of a Steam Power Plant are? |
| A. | Evaporator, Condenser, Boiler, Expansion valve |
| B. | Evaporator, Condenser, Boiler, Turbine |
| C. | Boiler, Turbine, Condenser, Pump |
| D. | Boiler, Turbine, Pump, Expansion valve |
| Answer» D. Boiler, Turbine, Pump, Expansion valve | |
| 36. |
A simple Rankine cycle produces 40 MW of power, 50 MW of process heat and rejects 60 MW of heat to the surroundings. What is the utilization factor of this co generation cycle neglecting the pump work? |
| A. | 50 |
| B. | 60 |
| C. | 70 |
| D. | 80 |
| Answer» C. 70 | |
| 37. |
What kind of energy output is obtained from a 'Steam Power Plant'? |
| A. | Heat energy |
| B. | Sound energy |
| C. | Electricity |
| D. | Thermal energy |
| Answer» D. Thermal energy | |
| 38. |
Why don't we use more than two reheats? |
| A. | not economical |
| B. | increased mechanical stresses |
| C. | net efficiency is decreased |
| D. | all of the mentioned |
| Answer» E. | |
| 39. |
The overall efficiency noverall of a steam power plant is given by? |
| A. | noverall = (power available at the generator terminals / (Fuel burning rate x Calorific Value of the fuel)) |
| B. | noverall = (power available at the generator terminals + (Fuel burning rate x Calorific Value of the fuel)) |
| C. | noverall = (power available at the generator terminals – (Fuel burning rate x Calorific Value of the fuel)) |
| D. | none of the mentioned |
| Answer» B. noverall = (power available at the generator terminals + (Fuel burning rate x Calorific Value of the fuel)) | |
| 40. |
For pressure ratio = 1, efficiency = 0, |
| A. | reheat is used |
| B. | reheat is not used |
| C. | only reheat is used |
| D. | none of the mentioned |
| Answer» C. only reheat is used | |
| 41. |
The most common type of Evaporator is? |
| A. | Flooded Evaporator |
| B. | Plate Evaporator |
| C. | Coil Evaporator |
| D. | Brine Evaporator |
| Answer» C. Coil Evaporator | |
| 42. |
External Thermal Irreversibility can be removed by which of the following process? |
| A. | Reheat |
| B. | Regeneration |
| C. | Pre-heat |
| D. | None of the mentioned |
| Answer» C. Pre-heat | |
| 43. |
Common size unit of a Steam Power Plant is? |
| A. | 30 MW(e) |
| B. | 300 MW(e) |
| C. | 500 MW(e) |
| D. | 150 MW(e) |
| Answer» D. 150 MW(e) | |
| 44. |
The thermal efficiency of a Watt's Beam Engine is about? |
| A. | 0.5 |
| B. | 1 |
| C. | 0.05 |
| D. | 0.02 |
| Answer» E. | |
| 45. |
If h & h1 are the enthalpies at the inlet & at the exhaust, s & s1 are the enthalpies at the inlet & exhaust, the mean temperature of heat addition, T with regeneration is ? |
| A. | (h + h1)/(s + s1) |
| B. | (h + h1)/(s – s1) |
| C. | (h – h1)/(s + s1) |
| D. | (h – h1)/(s – s1) |
| Answer» E. | |
| 46. |
Heat rate indicates? |
| A. | heat added per unit volume |
| B. | heat added per unit of work produced |
| C. | heat added per unit of mass stored |
| D. | heat added per unit area |
| Answer» C. heat added per unit of mass stored | |
| 47. |
Why Reheating of steam is used? |
| A. | to increase efficiency |
| B. | to increase work output |
| C. | to increase Turbine Inlet Temperature |
| D. | to reduce amount of fuel used |
| Answer» C. to increase Turbine Inlet Temperature | |
| 48. |
Shaft work is fed to __________ for getting an electrical output. |
| A. | Motor |
| B. | Generator |
| C. | Rotor |
| D. | Accelerator |
| Answer» C. Rotor | |
| 49. |
What is the mechanical efficiency of turbine? |
| A. | brake output / internal output |
| B. | internal output / brake output |
| C. | blade energy / energy supplied |
| D. | none of the mentioned |
| Answer» C. blade energy / energy supplied | |
| 50. |
In Rankine Cycle, water is converted to saturated liquid in ___________ |
| A. | Evaporator |
| B. | Economizer |
| C. | Superheater |
| D. | Preheater |
| Answer» C. Superheater | |