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GATE 2019: Thermodynamics Quiz 13

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Question 1

In a nozzle super heated steam expanding from 10 bar to 2 bar, the pressure at the throat will be

Question 2

In a 50% reaction stage, absolute velocity angle at inlet is 45 °, mean peripheral speed is 75 m/s and the absolute velocity at the exit is axial. The stage specific work is _____ m2/s2.

Question 3

A Kaplan turbine is suitable for:

Question 4

The impulse turbine blade efficiency is cos2α, where α is the nozzle exit angle, if

Question 5

A simple impulse turbine expands steam frictionlessly from 12 bar, 250 °C with an enthalpy of 2935 kJ/kg to an enthalpy of 2584 kJ/kg at 0.1 bar. Assuming that the nozzle makes an angle of 20 ° with the blade motion, and that the blades are symmetrical, find the blade velocity(in m/sec) that produces maximum efficiency for a turbine speed of 3600 rev/min. assume that the steam enters the nozzle with negligible velocity.

Question 6

In the velocity diagram shown below, u = blade velocity, C = absolute fluid velocity and w = relative velocity of fluid and the subscripts 1 and 2 refer to inlet and outlet. This diagram is for
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