The blade friction in the impulse turbine reduces the velocity of steam by __________ while it passes over the blades.

A)
15 to 20%
B)
10 to 15%
C)
30 to 40%
D)
20 to 30%

Correct Answer : Option (B) :   10 to 15%

Recently Updated in Steam Nozzles and Turbines Questions
The impulse turbine rotor efficiency will have a maximum value of 0.5 cos2 α, where α is the nozzle exit flow angle, if the
A)
blades are equiangular
B)
blade solidity is 0.65
C)
blade velocity coefficient is unity
D)
blades are equiangular and frictionless

Correct Answer :   blades are equiangular and frictionless

Rateau turbine is
A)
velocity compounded turbine
B)
simple reaction turbine
C)
pressure-velocity compounded turbine
D)
pressure compounded turbine

Correct Answer :   pressure compounded turbine

The flow of steam is super-sonic
A)
at the throat of the nozzle
B)
in the divergent portion of the nozzle
C)
at the entrance to the nozzle
D)
in the convergent portion of the nozzle

Correct Answer :   in the divergent portion of the nozzle

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Theory of Machines
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