1
GATE ME 1991
+2
-0.6
In a Rankine cycle heat is added
A
Reversibly at constant volume
B
Reversibly at constant temperature
C
Reversibly at constant pressure and temperature
D
Reversibly at constant pressure
2
GATE ME 1991
Fill in the Blanks
+2
-0
Velocity compounded steam turbine known as ___________ (Curtis / Rateau ) turbine uses the principle of converting entire __________ (pressure / velocity) energy before entering the first stage runner itself.
3
GATE ME 1991
Subjective
+5
-0
In a single heater regenerative cycle, steam enters the turbine at $$30$$ bar, $${300^0}C$$ and condenser pressure is $$0.096$$ bar. The feed water heater is a direct contact type which operates at $$5$$ bar. Draw flow and $$h$$-$$s$$ diagrams considering the condition of steam at entry to the heater in mixture region. Calculate steam extracted from heater to turbine in $$kg$$ per $$kg$$ of steam flow the cycle and cycle efficiency. The enthalpies of steam at different locations of the cycle are given in a table below. Pump work may neglected.
4
GATE ME 1991
Subjective
+5
-0
A $$7MW$$ hydro turbine working under a head of $$10$$ $$m$$ at a rotational speed of $$125$$ $$rpm$$ is to be designed and developed by conducting model tests in a laboratory. Maximum possible discharge to the model is $$600$$ liters per second at a constant head of $$5m.$$ Determine the minimum scale of the model and its speed if the expected efficiency of the model is $$85\% .$$
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