Question 11 : The supersaturated flow of steam through a nozzle as compared to a stable flow, the available heat drop
1. is unpredictable
2. decreases
3. remains the same
4. increases
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Question 12 : A turbine is said to have an axial discharge when the steam leaves the blade tip at __________ to the direction of the blade motion.
1. 90°
2. 270°
3. 180°
4. 60°
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Question 13 : 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
1. 0.56
2. 0.4
3. 0.67
4. 0.5
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Question 14 : A regenerative steam cycle renders
1. decreased work output per unit mass of steam as well as increased thermal efficiency
2. increased thermal efficiency
3. decreased work output per unit mass of steam
4. increased work output per unit mass of steam
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Question 15 : The critical pressure ratio for initially wet steam is
1. 0.582
2. 0.577
3. 0.601
4. 0.546
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Question 16 : The flow through a nozzle is regarded as
1. isothermal flow
2. constant volume flow
3. constant pressure flow
4. isentropic flow
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Question 17 : In a nozzle, whole frictional loss is assumed to occur between
1. all of these
2. throat and exit
3. inlet and outlet
4. inlet and thoroat
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Question 18 : The ratio of total useful heat drop to the total isentropic heat drop, is called
1. Rankine efficiency
2. stage efficiency
3. internal efficiency
4. none of these
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Question 19 : A nozzle is said to be a convergent nozzle
1. when the cross-section of the nozzle first decreases from entrance to throat and then increases from its throat to exit
2. when the cross-section of the nozzle increases continuously from entrance to exit
3. none of the above
4. when the cross-section of the nozzle decreases continuously from entrance to exit
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Question 20 : Rateau turbine is
1. simple reaction turbine
2. pressure compounded turbine
3. velocity compounded turbine
4. pressure-velocity compounded turbine
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