Effect of variation of Steam Condition on Thermal Efficiency MCQ

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• For the given values of efficiency, inlet steam pressure and quality of steam, pressure limits can be determined by?
  ক

  Mollier Charts

  খ

  Gantt Charts

  গ

  Mollier & Gantt Charts

  ঘ

  None of the mentioned
• Which of these cases will have a higher cycle efficiency?
  ক

  Condenser Pressure = 25 mm of Hg; Cooling Water Temperature = 12 degree Centigrade

  খ

  Condenser Pressure = 50 mm of Hg; Cooling Water Temperature = 27 degree Centigrade

  গ

  Condenser Pressure = 75 mm of Hg; Cooling Water Temperature = 36 degree Centigrade

  ঘ

  Condenser Pressure = 100 mm of Hg; Cooling Water Temperature = 45 degree Centigrade
• Apart from alloying, name a material that is used instead of ferritic steels to increase the ultimate strength of unalloyed steels.
  ক

  Chromium

  খ

  Molybdenum

  গ

  Austenitic steel

  ঘ

  None of the mentioned
• What is the percentage drop in the ultimate strength of unalloyed steels when the steam temperature is raised from 400-500 degree Centigrade?
  ক

  20%

  খ

  30%

  গ

  40%

  ঘ

  60%
• What is the effect of increasing steam inlet temperature on turbine internal efficiency?
  ক

  it remains same

  খ

  it increases

  গ

  it decreases

  ঘ

  none of the mentioned
• What is the effect of increasing superheat at constant inlet steam pressure & condenser pressure on mean temperature of heat addition?
  ক

  increases

  খ

  decreases

  গ

  remains same

  ঘ

  none of the mentioned
• What is the effect of increasing superheat at constant inlet steam pressure & condenser pressure on cycle efficiency?
  ক

  Steady decrement in cycle efficiency

  খ

  Steady improvement in cycle efficiency

  গ

  No effect on cycle efficiency

  ঘ

  None of the mentioned
• An increase in inlet steam temperature ___________ the heat rate.
  ক

  lowers

  খ

  increases

  গ

  does not have any effect on

  ঘ

  temperature has no significance in heat rate
• The cycle efficiency ________________ with the _____________ of condenser pressure.
  ক

  decreases, decrease

  খ

  increases, decrease

  গ

  remains same, decrease

  ঘ

  does not vary, decrease