Fluid Mechanics and Hydraulic Machinery Miscellaneous
- For a Newtonian fluid
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For a Newtonian fluid, shear stress is proportional to rate of shear strain.
Correct Option: C
For a Newtonian fluid, shear stress is proportional to rate of shear strain.
- Kaplan water turbine is commonly used when the flow through its runner is
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Kaplan turbine is an axial flow turbine and works at low heads (<50).
Correct Option: B
Kaplan turbine is an axial flow turbine and works at low heads (<50).
- In order to have maximum power from a Pelton turbine, the bucket speed must be
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For a pelton wheel, maximum power is obtained at,
u = υ 2 Correct Option: B
For a pelton wheel, maximum power is obtained at,
u = υ 2
- The velocity triangles at the inlet and exit of the rotor of a turbo machine are shown. V denotes the absolute velocity of the fluid, W denotes the relative velocity of the fluid and U denotes the blade velocity. Subscripts 1 and 2 refer to inlet and outlet respectively If V2 = W1 and V1 = W2, then the degree of reaction is
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DOR = W2² −W1² 2/W2² −W1² = 1 = 0.5 2 Correct Option: C
DOR = W2² −W1² 2/W2² −W1² = 1 = 0.5 2
- A hydraulic turbine develops 1000 kW power for a head of 40 m. If the head is reduced to 20 m, the power developed (in kW) is
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Pu = P H3/2 ∴ P1 = P2 H13/2 H23/2
⇒ P2 = 353.55 kW.Correct Option: B
Pu = P H3/2 ∴ P1 = P2 H13/2 H23/2
⇒ P2 = 353.55 kW.