Q.1
Calculate the mean blade velocity of a Parson’s reaction turbine, if the steam leaves the nozzle with an absolute velocity ofm/s. Take the nozzle angle asand the turbine works at maximum efficiency.
  • a) 156 m/s
  • b) 189 m/s
  • c) 256 m/s
  • d) 301 m/s
Q.2
The nozzle angle of a Parson’s reaction turbine is 25°. Determine the maximum possible efficiency for the turbine.
  • a) 75.62%
  • b) 84.56%
  • c) 90.19%
  • d) 93.21%
Q.3
The efficiency of steam turbine is greater than that of gas turbines.
  • a) True
  • b) False
Q.4
The following data refer to a particular stage of a Parson’s reaction turbine:
  • a) 56.32%
  • b) 65.75%
  • c) 78.74%
  • d) 84.79%
Q.5
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 ism/s. The axial velocity of flow of steam is half of the mean blade velocity. Determine the inlet angles of blades.
  • a) 45°
  • b) 53°
  • c) 63°
  • d) 71°
Q.6
Areaction turbine, having symmetrical velocity triangles, runs atr.p.m. The exit angles of the blades are 20°. The speed ratio is 0.8 and the diameter of the rotor blades is 1 meter. Determine the power developed if the mass flow rate of steam is 0.kg per second.
  • a) 6.534 kW
  • b) 7.654 kW
  • c) 8.425 kW
  • d) 9.612 kW
Q.7
In a steam turbine the turbine blade’s tip experiences more erosion than any other part.
  • a) True
  • b) False
Q.8
Which of the following is the correct definition for ‘Adiabatic Power’?
  • a) It is the power developed at the rim
  • b) It is the actual power transmitted by the turbine
  • c) It is the power based on the total internal steam flow and adiabatic heat drop
  • d) It is the power developed by the blades
Q.9
Which of the following is the correct definition of ‘Shaft Power’?
  • a) It is the power developed by the blades
  • b) It is the power developed at the rim
  • c) It is the power based on the total internal steam flow and adiabatic heat drop
  • d) It is the actual power transmitted by the turbine
Q.10
Which of the following statements regarding a Reaction turbine is FLASE?
  • a) The relative velocity of steam with respect to moving blade increases as the steam glides over the turbine blade
  • b) 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
  • c) If the degree of reaction of a reaction turbine is 50% then, the moving blade and the fixed blades have the same shape
  • d) The angles of receiving tips of fixed and moving blades are always equal
0 h : 0 m : 1 s