Mechanical Engineering - Steam Nozzles and Turbines

Exercise :: Steam Nozzles and Turbines - Section 2

6. 

De-Laval turbine is a

A. simple impulse turbine
B. simple reaction turbine
C. impulse-reaction turbine
D. none of these

Answer: Option A

Explanation:

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7. 

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 velocity coefficient is unity
C. blades are equiangular and frictionless
D. blade solidity is 0.65

Answer: Option C

Explanation:

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8. 

When the cross-section of a nozzle increases continuously from entrance to exit, it is called a

A. divergent nozzle
B. convergent nozzle
C. convergent-divergent nozzle
D. none of these

Answer: Option A

Explanation:

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9. 

Rateau turbine is

A. simple reaction turbine
B. velocity compounded turbine
C. pressure compounded turbine
D. pressure-velocity compounded turbine

Answer: Option C

Explanation:

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10. 

The ratio of the work delivered at the turbine shaft to the heat supplied is called overall thermal efficiency of turbine.

A. True
B. False

Answer: Option A

Explanation:

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