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Engineering
Mechanical
ME Set-1
Steam Nozzles and Turbines
130

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

Steam Nozzles and Turbines MCQ with Answers

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Related Steam Nozzles and Turbines MCQ with Answers

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

134) he efficiency of an impulse turbine is maximum when (where V_b = Blade speed, V = Absolute velocity of steam entering the blade, and ? = Nozzle angle)

V_b = 0.5 V cos ?

V_b = V cos ?

V_b = 0.5 V² cos ?

V_b = V² cos?

Answer is:

V_b = 0.5 V cos ?

Steam Nozzles and Turbines MCQ with Answers

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