Reaction Turbines MCQ

Test your knowledge with important Reaction Turbines MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30+ more Reaction Turbines MCQs on Bissoy. Bissoy App

• Which of the following statements regarding a Reaction turbine is FLASE?
  ক

  The relative velocity of steam with respect to moving blade increases as the steam glides over the turbine blade

  খ

  The degree of reaction for a reaction turbine is defined as the ratio of heat drop in moving blade to heat drop in the stage

  গ

  If the degree of reaction of a reaction turbine is 50% then, the moving blade and the fixed blades have the same shape

  ঘ

  The angles of receiving tips of fixed and moving blades are always equal
• Which of the following is the correct definition of ‘Shaft Power’?
  ক

  It is the power developed by the blades

  খ

  It is the power developed at the rim

  গ

  It is the power based on the total internal steam flow and adiabatic heat drop

  ঘ

  It is the actual power transmitted by the turbine
• Which of the following is the correct definition for ‘Adiabatic Power’?
  ক

  It is the power developed at the rim

  খ

  It is the actual power transmitted by the turbine

  গ

  It is the power based on the total internal steam flow and adiabatic heat drop

  ঘ

  It is the power developed by the blades
• In a steam turbine the turbine blade’s tip experiences more erosion than any other part.
  ক

  True

  খ

  False
• In a reaction turbine, the fixed blades and moving blades are of the same shape but reversed in direction. The angle of the discharging tip is 20°. The mean blade velocity is 200 m/s. The axial velocity of flow of steam is half of the mean blade velocity. Determine the inlet angles of blades.
  ক

  45°

  খ

  53°

  গ

  63°

  ঘ

  71°
• The efficiency of steam turbine is greater than that of gas turbines.
  ক

  True

  খ

  False
• Calculate the mean blade velocity of a Parson’s reaction turbine, if the steam leaves the nozzle with an absolute velocity of 320 m/s. Take the nozzle angle as 20° and the turbine works at maximum efficiency.
  ক

  156 m/s

  খ

  189 m/s

  গ

  256 m/s

  ঘ

  301 m/s
• In a Parson’s reaction turbine, the outlet angle of blade is 25°. Calculate the work done per second by the blades if the blade mean blade speed is 60 m/s and the absolute velocity of the steam leaving the nozzle is 120 m/s. The mass flow rate of steam is 0.1 kg per second.
  ক

  756 W

  খ

  854 W

  গ

  945.12 W

  ঘ

  1065 W
• In a reaction turbine, the fixed blades and the moving blades are of the same shape but reversed in direction. The mean blade speed is 30 m/s. The absolute velocity of the steam leaving the nozzle is 90 m/s and the absolute velocity of steam leaving the moving blade is 64 m/s. Determine the nozzle angle.
  ক

  20°

  খ

  25°

  গ

  30°

  ঘ

  35°
• In a single stage Parson’s reaction turbine, the mean blade velocity is observed to be 60 m/s and the nozzle angle to be 20°. Determine the the entrance angle of moving blade if the absolute velocity of the steam leaving the nozzle is 120 m/s.
  ক

  38°

  খ

  56°

  গ

  23°

  ঘ

  28°
• The following data refers to a particular stage of a Parson’s reaction turbine: Mean blade speed = 90 m/s Velocity of steam leaving the nozzle = 120 m/s Nozzle angle = 20° Mass flow rate of steam = 0.8 kg per second Calculate the tangential force on the blade.
  ক

  203.54 N

  খ

  108.42 N

  গ

  65.32 N

  ঘ

  195.45 N
• The axial force on the blades in Parson’s reaction turbine is always zero.
  ক

  True

  খ

  False
• What should be the ratio of blade speed to absolute velocity of steam leaving the nozzle for a Parson’s reaction turbine to work at maximum efficiency?
  ক

  cos⁡α

  খ

  cos⁡β

  গ

  sin⁡α

  ঘ

  sin⁡β
• Which of the following statements does NOT hold true for a Parson’s reaction turbine?
  ক

  α = Ф

  খ

  θ = β

  গ

  C1 = Cr2

  ঘ

  Cr1 = Cr2
• The degree of reaction of a Parson’s reaction turbine is _____
  ক

  0%

  খ

  25%

  গ

  50%

  ঘ

  100%
• In case of reaction turbines, the magnitude of velocity of steam relative to moving blade increases as the steam progresses.
  ক

  True

  খ

  False
• The magnitude of velocity of steam relative to moving blade in case of an impulse turbine _____
  ক

  always remains constant as steam glides over the blades

  খ

  depending on friction present on the blades, increases or remains constant as the steam glides over the blades

  গ

  depending on friction present on the blades, decreases or remains constant as the steam glides over the blades

  ঘ

  depending on friction present on the blades, increases or decreases as the steam glides over the blades