Home » Mechanical Engineering » Steam Nozzles and Turbines

Thermal states: definition related to supersaturation Definition prompt: “The difference between the supersaturated temperature and the saturation temperature at the same pressure is called …” Choose the correct term.

Difficulty: Easy

Degree of supersaturation
Degree of superheat
Degree of undercooling
None of these

Correct Answer: Degree of undercooling

Explanation:

Concept/Approach

In nozzle flows, supersaturation refers to the fluid being below the saturation temperature (delayed condensation).
The temperature deficit relative to saturation at the same pressure is the degree of undercooling (also termed supercooling).

Final Answer
Degree of undercooling

← Previous Question Next Question→

More Questions from Steam Nozzles and Turbines

Degree of reaction from enthalpy drops in a turbine stage Given: Isentropic enthalpy drop in the moving blade (rotor) is two-thirds of the isentropic enthalpy drop in the fixed blade (stator). Compute the degree of reaction R = (rotor drop)/(stator drop + rotor drop). Choose the correct value.
Critical pressure condition at a nozzle throat Choose the correct statement about the steam velocity at the throat when the flow is critical (choked).
Critical pressure ratio for initially wet steam Select the correct value of the critical pressure ratio (p₂/p₁ at the throat corresponding to maximum discharge) for initially wet steam. Choose the correct option.
Types of multi-stage steam turbines Identify which turbine configurations can be multi-stage in practical steam turbine design. Choose the correct option.
Maximum efficiency of a reaction turbine The prompt is incomplete and lacks the necessary constraints (e.g., inlet/exit angles, degree of reaction, losses) to state a unique numeric maximum efficiency. Choose the most appropriate statement.
Meaning of critical pressure (choked condition) in steam nozzles Statement: The critical pressure corresponds to steam velocity at the throat being equal to the local speed of sound (sonic condition). Decide whether the statement is correct.
Components of a binary vapour (mercury–steam) power plant Identify which of the following are included as core components in a classic binary vapour plant arrangement. Choose the correct option.
Blade geometry in a Parsons reaction turbine For a Parsons (≈50% reaction) turbine stage, determine the relation between fixed (stator) and moving (rotor) blade shapes. Choose the correct option.
Definition of axial discharge from turbine blades A turbine has axial discharge when the absolute exit steam direction makes what angle with the blade motion (tangential) direction? Choose the correct option.
Terminology: axial-flow turbines Statement: A turbine in which the general direction of steam flow is parallel to the turbine axis is called an axial-flow turbine. Decide whether the statement is correct.

Discussion & Comments

No comments yet. Be the first to comment!

Join Discussion