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Consider the following statements: 
A convergent-divergent nozzle is said to be choked when
1. Critical pressure is attained at the throat.
2. Velocity at the throat becomes sonic.
3. Exit velocity becomes supersonic.
Of these correct statements are
  • a)
    1, 2 and 3
  • b)
    1 and 2
  • c)
    2 and 3
  • d)
    1 and 3
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Consider the following statements:A convergent-divergent nozzle is sai...
Ans. (b) A convergent divergent nozzle is said to be choked when critical pressure
is attained at the throat and velocity at the throat becomes sonic.
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Most Upvoted Answer
Consider the following statements:A convergent-divergent nozzle is sai...
Choked Condition in a Convergent-Divergent Nozzle
Choked condition in a convergent-divergent nozzle occurs when the mass flow rate through the nozzle reaches its maximum value. This condition is important in the design and operation of nozzles for various applications.

Key Points:
- Critical Pressure at the Throat: When a convergent-divergent nozzle is choked, the pressure at the throat reaches the critical pressure. This critical pressure is the minimum pressure that can be achieved in the nozzle flow.
- Velocity at the Throat: At the choked condition, the velocity of the flow at the throat becomes sonic. This means that the flow velocity reaches the speed of sound, which is the maximum achievable velocity at the throat.
Therefore, in the given statements, only statement 1 and 2 are correct. The exit velocity becoming supersonic (statement 3) is not a characteristic of a choked convergent-divergent nozzle.
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