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)
sin2 α
cos2 α
tan2 α
cot2 α
Answer: Option
Explanation:
No answer description is available. Let's discuss.

12.
The pressure compounded impulse turbine as compared to velocity compounded turbine require __________ number of stages.
same
less
more
Answer: Option
Explanation:
No answer description is available. Let's discuss.

13.
In a reaction turbine when the degree of reaction is zero, then there is
no heat drop in moving blades
no heat drop in fixed blades
maximum heat drop in moving blades
maximum heat drop in fixed blades
Answer: Option
Explanation:
No answer description is available. Let's discuss.

14.
The effect of friction in the nozzle __________ dryness fraction of steam.
has no effect on
decreases
increases
Answer: Option
Explanation:
No answer description is available. Let's discuss.

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
160/3 m/s
320/3 m/s
640/3 m/s
640 m/s
Answer: Option
Explanation:
No answer description is available. Let's discuss.