The critical pressure ratio is given by (where p1 = Initial pressure of steam, a

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Question
The critical pressure ratio is given by (where p₁ = Initial pressure of steam, and p₂ = Pressure of steam at throat or critical pressure)
Options
A. p₁ p₂
B. p₁/p₂
C. p₂/p₁
D. p₁ + p₂

Correct Answer

p₂/p₁

Steam Nozzles and Turbines problems

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1. A steam turbine, in which a part of the steam after partial expansion, is used for process heating and the remaining steam is further expanded for power generation, is known as
Options
A. back pressure turbine
B. pass out turbine
C. low pressure turbine
D. impulse turbine

3. Degree of reaction is defined as the ratio of
Options
A. heat drop in fixed blades to the heat drop in moving blades
B. heat drop in moving blades to the heat drop in fixed blades
C. heat drop in moving blades to the heat drop in fixed blades plus heat drop in moving blades
D. heat drop in fixed blades plus heat drop in moving blades to the heat drop in moving blades

4. In a reaction turbine when the degree of reaction is zero, then there is
Options
A. no heat drop in moving blades
B. no heat drop in fixed blades
C. maximum heat drop in moving blades
D. maximum heat drop in fixed blades

7. In a reaction turbine, when steam flows through the moving blades,
Options
A. pressure increases while velocity decreases
B. pressure decreases while velocity increases
C. pressure and velocity both decreases
D. pressure and velocity both increases

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