The maximum efficiency of a De-Laval turbine is (where Î± = Nozzle angle)

Mechanical Engineering : Steam Nozzles and Turbines - Quiz(MCQ)

cosÂ² Î±

sinÂ² Î±

cotÂ² Î±

tanÂ² Î±

Correct Answer : Option (A) : cosÂ² Î±

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The impulse turbine rotor efficiency will have a maximum value of 0.5 cos2 Î±, where Î± is the nozzle exit flow angle, if the

blades are equiangular

blade solidity is 0.65

blade velocity coefficient is unity

blades are equiangular and frictionless

Correct Answer : blades are equiangular and frictionless

Rateau turbine is

velocity compounded turbine

simple reaction turbine

pressure-velocity compounded turbine

pressure compounded turbine

Correct Answer : pressure compounded turbine

The flow of steam is super-sonic

at the throat of the nozzle

in the divergent portion of the nozzle

at the entrance to the nozzle

in the convergent portion of the nozzle

Correct Answer : in the divergent portion of the nozzle