Mechanical Engineering - Steam Nozzles and Turbines

Exercise :: Steam Nozzles and Turbines - Section 1

11. 

The isentropic enthalpy drop in moving blade is two-third of the isentropic enthalpy drop in fixed blades of a turbine. The degree of reaction will be

A. 0.4
B. 0.56
C. 0.67
D. 1.67

Answer: Option A

Explanation:

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12. 

The impulse reaction turbine has its driving force

A. as an impulsive force
B. as a reaction force
C. partly as an impulsive force and partly as a reaction force
D. none of the above

Answer: Option C

Explanation:

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13. 

The efficiency of reaction turbine is maximum when (where α = Angle made by the absolute velocity (V) at inlet)

A. Vb = 0.5 V cos α
B. Vb = V cos α
C. Vb = 0.5 V2 cos α
D. Vb = V2 cos α

Answer: Option B

Explanation:

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14. 

A regenerative steam cycle renders

A. increased work output per unit mass of steam
B. decreased work output per unit mass of steam
C. increased thermal efficiency
D. decreased work output per unit mass of steam as well as increased thermal efficiency

Answer: Option D

Explanation:

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15. 

De-Laval turbine is a

A. single rotor impulse turbine
B. multi-rotor impulse turbine
C. impulse reaction turbine
D. none of these

Answer: Option A

Explanation:

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