Home » Mechanical Engineering » Steam Nozzles and Turbines

Flow through fixed (stator) blades in a reaction turbine When steam flows through the fixed blades (nozzle passages) of a reaction turbine, how do pressure and velocity change? Choose the correct option.

Q: Flow through fixed (stator) blades in a reaction turbine When steam flows through the fixed blades (nozzle passages) of a reaction turbine, how do pressure and velocity change? Choose the correct option.

Concept In a reaction turbine, the fixed blades act as nozzles. Across a nozzle, steam expands: pressure drops and kinetic energy (hence velocity) rises. Therefore Pressure ↓, Velocity ↑ Final Answer Pressure decreases while velocity increases

Difficulty: Easy

Pressure increases while velocity decreases
Pressure decreases while velocity increases
Pressure and velocity both decrease
Pressure and velocity both increase

Correct Answer: Pressure decreases while velocity increases

Explanation:

Concept
In a reaction turbine, the fixed blades act as nozzles. Across a nozzle, steam expands: pressure drops and kinetic energy (hence velocity) rises.

Therefore
Pressure ↓, Velocity ↑

Final Answer
Pressure decreases while velocity increases

← Previous Question Next Question→

More Questions from Steam Nozzles and Turbines

Critical pressure condition: behavior of discharge (mass flow rate) Complete the statement about nozzles/orifices: The discharge is ________ at the critical pressure ratio. Choose the correct option.
Stage efficiency relation: combining nozzle and blade efficiencies Given nozzle efficiency (η_N) and blading efficiency (η_B), express the stage efficiency (η_S). Choose the correct option.
Nozzle inlet state: identify pressure and velocity conditions at entry Select the correct combination for the state of steam at the inlet to a nozzle. Choose the correct option.
Steam nozzles and flow: identify the correct statement Options describe expansion, frictional effect on dryness fraction, and the definition of critical pressure at the throat. Choose the single correct statement.
Reaction turbines: source of axial thrust Given causes: (a) Pressure drop across the rotor (b) Change in axial component of velocity Select the correct cause(s) of axial thrust.
Steam turbine blades: definition check for blade velocity coefficient Statement to judge: “The blade velocity coefficient equals the ratio of the relative velocity of steam at the outlet tip of the blade to the relative velocity at the inlet tip of the blade.” Choose whether the statement is correct or incorrect.
Parsons turbine identification: percentage reaction Parsons (50% reaction) turbine characteristic. Choose the correct percentage of reaction.
Improving steam turbine efficiency: pick valid method(s) Common cycle/plant modifications to raise efficiency. Choose the best option.
Nozzle exit velocity formula (steam): select the correct relation Let K be the nozzle efficiency (or nozzle coefficient) and h_d be the enthalpy (heat) drop during expansion per kilogram. Choose the correct expression for the theoretical exit velocity V (m/s).
Definition check: back pressure at nozzle exit Statement to judge: “The pressure at which the steam leaves the nozzle is known as the back pressure.” Choose whether the statement is correct or incorrect.

Discussion & Comments

No comments yet. Be the first to comment!

Join Discussion