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GATE 2022 ME: Fluid Mechanics Quiz-12

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Question 1

The degree of reaction for pelton turbine is ______.

Question 2

Consider two hydraulic turbines having identical specific speed and effective head at the inlet. If the speed ratio (N1/N2) of the two turbines is 2, then the respective power ratio (P1/P2) is ________

Question 3

A single acting reciprocating pump, having an efficiency of 96%, lifts water to a height of 175 m. The piston area of pump is 1200 cm2 and stroke length is 400 cm. The friction head loss in the pipe is 17 m. The required pump work (in kJ) will be _______. Assume (g = 10m/s2)

Question 4

A pelton turbine is to operate under a net head of 500 m at 420 rpm. If a single jet with diameter 18 cm is used, find the specific speed of the machine. Take Cv = 0.98, ϕ = 0.45 and overall efficiency .

Question 5

For a Kaplan (axial flow) turbine, the outlet blade velocity diagram at a section is shown in figure.

The diameter at this section is 3 m. The hub and tip diameters of the blade are 2 m and 4 m respectively. The water volume flow rate is 100 m3/s. The rotational speed of the turbine is 300 rpm. The blade outlet angle β is _____ degrees (round off to one decimal place).

Question 6

A centrifugal pumps having efficiency of 75%, is used to deliver 2000 L/min. of water at 20o C when the brake power is 25HP. The rise in pressure (in kPa), is
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