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ME Set-1
Steam Nozzles and Turbines
129

Steam Nozzles and Turbines MCQ with Answers

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

10 to 15%

15 to 20%

20 to 30%

30 to 40%

Answer is:

10 to 15%

Steam Nozzles and Turbines MCQ with Answers

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Related Steam Nozzles and Turbines MCQ with Answers

130) The effect of bleeding is that

it increases the thermodynamic efficiency of the turbine

boiler is supplied with hot water

it decreases the power developed by the turbine

all of the above

Answer is:

all of the above

131) The expansion of steam, as it flows over the blades in reaction turbine, represents

isothermal process

isentropic process

throttling process

free-expansion process

Answer is:

isentropic process

132) The critical pressure ratio for initially superheated steam is __________ as compared to initially dry saturated steam.

more

less

equal

none of these

Answer is:

less

133) For a Parson's reaction turbine, if ?₁ and ?₂ are fixed blade angles at inlet and exit respectively and ?₁ and ?₂ are the moving blade angles at entrance and exit respectively, then

?₁ = ?₂ and ?₁ = ?₂

?₁ = ?₁ and ?₂ = ?₂

?₁ < ?₁ and ?₂ > ?₂

?₁ = ?₂ and ?₁ = ?₂

Answer is:

?₁ = ?₂ and ?₁ = ?₂

Steam Nozzles and Turbines MCQ with Answers

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