# Mechanical Engineering - Steam Nozzles and Turbines

### Exercise :: Steam Nozzles and Turbines - Section 3

11.

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

 A. sin2 α B. cos2 α C. tan2 α D. cot2 α

Explanation:

No answer description available for this question. Let us discuss.

12.

The pressure compounded impulse turbine as compared to velocity compounded turbine require __________ number of stages.

 A. same B. less C. more

Explanation:

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13.

In a reaction turbine when the degree of reaction is zero, then there is

 A. no heat drop in moving blades B. no heat drop in fixed blades C. maximum heat drop in moving blades D. maximum heat drop in fixed blades

Explanation:

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14.

The effect of friction in the nozzle __________ dryness fraction of steam.

 A. has no effect on B. decreases C. increases

Explanation:

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15.

In a Parson's turbine stage, blade velocity is 320 m/s at the mean radius and rotor blade exit angle is 30°. For minimum kinetic energy of the steam leaving the stage, the steam velocity at the exit of the rotor will be

 A. 160/3 m/s B. 320/3 m/s C. 640/3 m/s D. 640 m/s