Steam Turbine MCQ

Test your knowledge with important Steam Turbine MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Steam Turbine MCQs at Bissoy

• Boiler extracts heat from the working fluid.
  ক

  True

  খ

  False
• In double acting steam engine pressure acts on the both sides of the valves.
  ক

  True

  খ

  False
• Energy efficiency of superficial steam is _________
  ক

  low

  খ

  high

  গ

  same as other steams

  ঘ

  none of the mentioned
• Superficial steam power plants operate at _____ temperatures.
  ক

  high

  খ

  low

  গ

  constant

  ঘ

  none of the mentioned
• ________ and pressure of the superficial steam are at critical points.
  ক

  Specific heat

  খ

  Volume

  গ

  Temperature

  ঘ

  None of the mentioned
• When steam pressure ________ it becomes superficial fluid.
  ক

  Decreases

  খ

  Increases

  গ

  Steam can not become superficial fluid

  ঘ

  None of the mentioned
• When lubrication is failed _____________ is used.
  ক

  Centrifugal governor

  খ

  Emergency governor

  গ

  Potter governor

  ঘ

  None of the mentioned
• When balancing of the turbine is disturbed ___________ is used.
  ক

  Potter governor

  খ

  Centrifugal governor

  গ

  Emergency governor

  ঘ

  None of the mentioned
• When is emergency governing used?
  ক

  Speed of shaft increased above 110%

  খ

  When turbine is shut down due to overload

  গ

  When Low steam is entering

  ঘ

  None of the mentioned
• During overload of turbines __________ are used.
  ক

  throttle governing

  খ

  nozzle valves

  গ

  bypass governing

  ঘ

  none of the mentioned
• In nozzle governing the flow rate is controlled by ____________
  ক

  opening and closing the valves at nozzle

  খ

  adding more number of nozzles

  গ

  increasing nozzle efficiency

  ঘ

  none of the mentioned
• For calculating heat rate in steam turbines enthalpy is calculated.
  ক

  False

  খ

  True
• What is heat rate in turbine?
  ক

  Heat required for unit of power generated in specific conditions and specific fuel burning

  খ

  Amount of heat required to expand turbine blades

  গ

  Amount of heat required to increase pressure of steam

  ঘ

  None of the mentioned
• Heat rate defines how much energy is to be expanded for obtaining a unit of useful work.
  ক

  True

  খ

  False
• Superheating the steam results in __________
  ক

  increasing the efficiency

  খ

  decreases the moisture content

  গ

  increasing efficiency & decreases the moisture content

  ঘ

  none of the mentioned
• Superheating the steam increases efficiency.
  ক

  True

  খ

  False
• When condenser pressure is lowered efficiency _________
  ক

  increases

  খ

  decreases

  গ

  does not effect

  ঘ

  none of the mentioned
• Increase in temperature increases __________
  ক

  reheating capacity of the fluid

  খ

  thermal efficiency

  গ

  reheating capacity of the fluid & thermal efficiency

  ঘ

  none of the mentioned
• What happens to the efficiency when temperature is increased in rankine cycle?
  ক

  Increased

  খ

  Decreased

  গ

  Remains constant

  ঘ

  None of the mentioned
• Can we keep on increasing the pressure of the boiler to increase its efficiency?
  ক

  Yes

  খ

  No
• When boiler pressure is increased __________
  ক

  efficiency is increased

  খ

  Qh is increased

  গ

  efficiency & Qh is increased

  ঘ

  none of the mentioned
• Why is operating pressure of boiler designed?
  ক

  To maintain economic equivalence

  খ

  For not decreasing efficiency

  গ

  No such operating pressures are designed

  ঘ

  None of the mentioned
• When boiler pressure is increased efficiency is ____________
  ক

  decreased

  খ

  increased

  গ

  remains constant

  ঘ

  none of the mentioned
• A boiler feed pump is used to raise ___________
  ক

  Static pressure of feedwater

  খ

  Dynamic pressure of feedwater

  গ

  Static & Dynamic pressure of feedwater

  ঘ

  None of the mentioned
• In a solar operated steam power plant, water is converted into steam via solar heat. If the effective area of solar plate is 200m2, value of solar constant is 1.362KW per m2, efficiency of solar components is 17% and overall thermal efficiency of steam cycle desired is 12%. Find the turbine power output?
  ক

  45KW

  খ

  22.46KW

  গ

  5.55KW

  ঘ

  16.54KW
• The mass of coal(lignite) used in boiler of a steam power plant is 20 ton per hour and calorific value of lignite is 13600 KJ/kg. Also, if the entropy of steam entering turbine is 750 J/K and that of feedwater entering the boiler is 550J/K. Find the mean temperature of heat addition?
  ক

  100 deg C

  খ

  115 deg C

  গ

  110 deg C

  ঘ

  105 deg C
• A researcher during an experiment found that mean temperature of heat addition and heat rejection for a steam power plant operating on a Carnot cycle is 127 deg C and 27 deg C respectively. Later, he calculated the thermal efficiency of the steam cycle. Can you predict what was it?
  ক

  0.20

  খ

  0.25

  গ

  0.30

  ঘ

  0.35
• Why does Carnot cycle has maximum efficiency?
  ক

  Since all the processes in Carnot cycle are completely reversible

  খ

  Since only process of expansion and compression are reversible

  গ

  Since only the process of heat addition and heat rejection are reversible

  ঘ

  Since all processes involved are irreversible
• In a newly developed innovative idea brought up by CSIR in India, gas turbine exhaust gas are being utilized to convert feedwater into steam. Certain data of the experiment are as follows: mass flow rate of exhaust gas = 40 kg/hr, enthalpy of exhaust gas at the time of their exit from gas turbine is 600 kJ/kg, steam turbine output as measured by brake dynamometer = 60 hp-sec, thermal efficiency of steam power plant is 0.25, efficiency of exhaust gas in converting feedwater into steam is taken as 50%. Find the enthalpy of exhaust gas remaining after they generate steam from feedwater?
  ক

  350.0KJ/Kg

  খ

  241.2KJ/Kg

  গ

  112.45KJ/Kg

  ঘ

  512.56KJ/Kg
• In a steam turbine power plant, the boiler feedwater temperature is marked as 30 deg C, ocean as sink with temperature 20 deg C and desired thermal efficiency of the plant is 0.46. Find the temperature of steam entering the turbine?
  ক

  500degC

  খ

  505.55degC

  গ

  507.62degC

  ঘ

  509.18degC