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.
| 51. |
Efficiency of a Rankine Cycle is also expressed as__________ |
| A. | Capacity Ratio |
| B. | Heat Rate |
| C. | Heat Ratio |
| D. | Steam Rate |
| Answer» C. Heat Ratio | |
| 52. |
Name the major isotope present in steam generated in a Boiling Water Reactor. |
| A. | N-16 |
| B. | D-32 |
| C. | N-32 |
| D. | D-16 |
| Answer» B. D-32 | |
| 53. |
What percentage of fuel energy is actually converted to electrical energy? |
| A. | 0.5 |
| B. | 0.4 |
| C. | 0.34 |
| D. | 0.25 |
| Answer» D. 0.25 | |
| 54. |
Which of these is a 'fissile fuel'? |
| A. | Thorium |
| B. | Carbon |
| C. | Potassium |
| D. | Graphite |
| Answer» B. Carbon | |
| 55. |
The temperature to which air must be cooled in order to become saturated is the |
| A. | minimum temperature |
| B. | dew point temperature |
| C. | wet-bulb temperature |
| D. | freezing point |
| Answer» C. wet-bulb temperature | |
| 56. |
Critical pressure of water is |
| A. | 1 kg / cm2 |
| B. | 100 kg / cm2 |
| C. | 155 kg / cm2 |
| D. | 217.7 kg / cm2 |
| Answer» E. | |
| 57. |
Which of these shouldn't be there in the pipelines of working fluid for achieving the conditions of Carnot Cycle? |
| A. | Heat Transfer |
| B. | Insulation |
| C. | Lubrication |
| D. | Zero Friction |
| Answer» B. Insulation | |
| 58. |
What is the value of “beta” if h represents the local enthalpy on the given expansion line at a given pressure & hf is the enthalpy of saturated water at that pressure? |
| A. | h + hf |
| B. | h x hf |
| C. | h – hf |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 59. |
Where is the deaerator placed in the feedwater system? |
| A. | in the beginning |
| B. | in the middle |
| C. | at the end |
| D. | there is no deaerator in the feedwater system |
| Answer» C. at the end | |
| 60. |
Which gases are vented out of the deaerator? |
| A. | Oxygen only |
| B. | Carbon dioxide only |
| C. | Oxygen & Carbon dioxide both |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 61. |
Coal used in power plant is also known as |
| A. | steam coal |
| B. | charcoal |
| C. | coke |
| D. | soft coal |
| Answer» B. charcoal | |
| 62. |
What approximate percentage of energy in the fuel is converted to electricity? |
| A. | 0.55 |
| B. | 0.45 |
| C. | 0.35 |
| D. | 0.25 |
| Answer» D. 0.25 | |
| 63. |
Which of the following is not a component of Brayton cycle? |
| A. | Compressor |
| B. | Combustion Chamber |
| C. | Turbine |
| D. | Pump |
| Answer» E. | |
| 64. |
Which of these is a disadvantage of open heater? |
| A. | simplicity |
| B. | lower cost |
| C. | high heat transfer capacity |
| D. | none of the mentioned |
| Answer» E. | |
| 65. |
Which of these is an output of a 'Furnace'? |
| A. | Fuel gas |
| B. | Air |
| C. | Flue gases |
| D. | Water Vapor |
| Answer» D. Water Vapor | |
| 66. |
Which of these is a 'working fluid' in liquid phase? |
| A. | Water |
| B. | Steam |
| C. | Mercury |
| D. | Oxygen |
| Answer» B. Steam | |
| 67. |
Why is the deaerator placement in the feedwater system so important? |
| A. | to maximise pressure difference between the condenser & the boiler |
| B. | to minimise pressure difference between the condenser & the boiler |
| C. | to make the pressure difference between the condenser & the boiler Zero |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 68. |
In the T-S diagram of a Rankine cycle, the abscissa represents? |
| A. | total entropy of turbine steam |
| B. | partial entropy of turbine steam |
| C. | partial enthalpy of turbine steam |
| D. | none of the mentioned |
| Answer» B. partial entropy of turbine steam | |
| 69. |
Which of these constitute a Carnot Cycle? |
| A. | 2 reversible isotherms & 2 reversible adiabatics |
| B. | 1 reversible isotherms & 2 reversible adiabatics |
| C. | 2 reversible isotherms & 1 reversible adiabatics |
| D. | 1 reversible isotherms & 2 reversible adiabatics |
| Answer» B. 1 reversible isotherms & 2 reversible adiabatics | |
| 70. |
Is regenerative cycle alone useful? |
| A. | Yes |
| B. | No |
| C. | may be |
| D. | depends on other factors |
| Answer» B. No | |
| 71. |
What is the most preferable dryness fraction of the exhaust steam? |
| A. | 0.99 |
| B. | 0.77 |
| C. | 0.66 |
| D. | 0.88 |
| Answer» E. | |
| 72. |
If q represents the work output, r represents the work input, Q represents the heat input, the efficiency n in terms of q & r is given by? |
| A. | n = (q-r)/Q |
| B. | n = ( q+r)/Q |
| C. | n = (qr)/Q |
| D. | n = (qr x qr)/Q |
| Answer» B. n = ( q+r)/Q | |
| 73. |
Apart from alloying, name a material that is used instead of ferritic steels to increase the ultimate strength of unalloyed steels. |
| A. | Chromium |
| B. | Molybdenum |
| C. | " Austenitic steelb) None of the mentionedView AnswerAnswer: cExplanation: The use of Austenitic steels increases the ultimate strength of unalloyed steels at high temperatures. The temperature limits are in the range 538-565 degree Centigrade.9. Which of these cases will have a higher cycle efficiency?a) Condenser Pressure= 25 mm of Hg; C |
| D. | Condenser Pressure= 100 mm of Hg; Cooling Water Temperature= 45 degree Centigrade |
| Answer» B. Molybdenum | |
| 74. |
The mechanical efficiency of a turbine is given by? (ntm denotes the mechanical efficiency) |
| A. | ntm = (brake output of the turbine x internal output of the turbine) |
| B. | ntm = (internal output of the turbine / break output of the turbine) |
| C. | ntm = (brake output of the turbine / internal output of the turbine) |
| D. | ntm = (brake output of the turbine – internal output of the turbine) |
| Answer» D. ntm = (brake output of the turbine – internal output of the turbine) | |
| 75. |
Which of the following is not an advantage of an open heater? |
| A. | simplicity |
| B. | lower cost |
| C. | high heat transfer capacity |
| D. | necessity of a pump at each heater to handle the large feedwater stream |
| Answer» E. | |
| 76. |
Function of surge tank? |
| A. | Regulation of water pressure |
| B. | Regulation of steam pressure |
| C. | Storage |
| D. | Regulation of lubricants |
| Answer» B. Regulation of steam pressure | |
| 77. |
Efficiency of a power plant is more in summers or winters? |
| A. | summers |
| B. | winters |
| C. | same in both |
| D. | depends on variation |
| Answer» C. same in both | |
| 78. |
Which of the following shows the correct relation? (nboiler denotes efficiency of a boiler) |
| A. | nboiler = (rate of energy absorption by water to form steam / rate of energy released by the combustion of fuel) |
| B. | nboiler = (rate of energy absorption by water to form steam + rate of energy released by the combustion of fuel) |
| C. | nboiler = (rate of energy absorption by water to form steam – rate of energy released by the combustion of fuel) |
| D. | nboiler = (rate of energy absorption by water to form steam x rate of energy released by the combustion of fuel) |
| Answer» B. nboiler = (rate of energy absorption by water to form steam + rate of energy released by the combustion of fuel) | |
| 79. |
What is the effect of increase in steam rate on boiler size? |
| A. | boiler size increases |
| B. | boiler size increases |
| C. | boiler size is independent of steam rate |
| D. | none of the mentioned |
| Answer» B. boiler size increases | |
| 80. |
A Hydraulic Ram Pump is based on the principle of? |
| A. | Wind Hammer |
| B. | Water hammer |
| C. | Wind gushing |
| D. | None of the mentioned |
| Answer» C. Wind gushing | |
| 81. |
“Regenerative feedwater heating by turbine extraction” is often termed as? |
| A. | Electrophoresis of Rankine cycle |
| B. | Sterlinisation of Rankine cycle |
| C. | Carnotization of Rankine cycle |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 82. |
If Q1 represents the rate of heat addition to the cycle and W represents net cycle work output, the expression for net cycle heat rate is ? |
| A. | Q1 + W |
| B. | Q1 / W |
| C. | Q1 / (1/ W) |
| D. | Q1 x W |
| Answer» C. Q1 / (1/ W) | |
| 83. |
What is the exhaust condition of a Watt's Beam Engine? |
| A. | near saturation |
| B. | dry |
| C. | wet |
| D. | 0.9 dry |
| Answer» D. 0.9 dry | |
| 84. |
The area of parallelogram in the T-S diagram representing the cycle output is equal to? |
| A. | area of rectangle representing the output of the Carnot cycle |
| B. | area of the triangle representing the output of the Carnot cycle |
| C. | area of the square representing the output of the Carnot cycle |
| D. | none of the mentioned |
| Answer» B. area of the triangle representing the output of the Carnot cycle | |
| 85. |
If plant efficiency is high, what will be its effect on heater size? |
| A. | it remains same |
| B. | it increases |
| C. | it decreases |
| D. | none of the mentioned |
| Answer» C. it decreases | |
| 86. |
Reheat is preferred for the plants having efficiency greater than |
| A. | 150MW |
| B. | 200MW |
| C. | 100MW |
| D. | 250MW |
| Answer» D. 250MW | |
| 87. |
In an ideal regenerative cycle, the work output is at? |
| A. | Boiler |
| B. | Turbine |
| C. | Condenser |
| D. | Pump |
| Answer» C. Condenser | |
| 88. |
Heat rejection in a condenser is to? |
| A. | cooled water |
| B. | coolant |
| C. | cooling water |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 89. |
The expression for the overall temperature difference T is given by? |
| A. | t = boiler saturation temperature – condenser temperature |
| B. | t = boiler saturation temperature + condenser temperature |
| C. | t = boiler saturation temperature x condenser temperature |
| D. | t = boiler saturation temperature / condenser temperature |
| Answer» B. t = boiler saturation temperature + condenser temperature | |
| 90. |
The cogeneration plant efficiency nco if WT, Qi, QH represents turbine work, heat input, heat output respectively is given by? |
| A. | nCO = (WT + Qi) / QH |
| B. | nCO = (WT – Qi) / QH |
| C. | nCO = (WT + QH) / Qi |
| D. | nCO = (WT + QH) / Qi |
| Answer» E. | |
| 91. |
Among 1 MW, 2 MW, 30 MW & 660 MW locomotive steam engines, the highest initial temperature is of? |
| A. | 1 MW |
| B. | 2 MW |
| C. | 30 MW |
| D. | 660 MW |
| Answer» E. | |
| 92. |
Steam used to heat water comes from? |
| A. | boiler |
| B. | turbine |
| C. | condenser |
| D. | external power source |
| Answer» C. condenser | |
| 93. |
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 | |
| 94. |
Shaft_work_is_fed_to____________for_getting_an_electrical_output.$ |
| A. | Motor |
| B. | Generator |
| C. | Rotor |
| D. | Accelerator |
| Answer» C. Rotor | |
| 95. |
The product of efficiency & heat transferred to the working fluid is? |
| A. | Net temperature change |
| B. | Net work done |
| C. | Net enthalpy change |
| D. | None of the mentioned |
| Answer» C. Net enthalpy change | |
| 96. |
The net change in internal energy in a steam power plant is? |
| A. | Positive |
| B. | Negative |
| C. | Zero |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 97. |
Water that is fed back to the boiler by the pump is called? |
| A. | Adsorbate |
| B. | Absorbate |
| C. | Condenset |
| D. | Condensate |
| Answer» E. | |
| 98. |
What kind of a process does a ‘Steam Power Plant’ undergoes?$ |
| A. | Adiabatic |
| B. | Cyclic |
| C. | Irreversible |
| D. | Expansion |
| Answer» C. Irreversible | |
| 99. |
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 | |
| 100. |
Which of these is an output of a ‘Furnace’?$ |
| A. | Fuel gas |
| B. | Air |
| C. | Flue gases |
| D. | Water Vapor |
| Answer» D. Water Vapor | |