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
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