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 |
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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