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Question
Consider the following devices :
1. Orifice
2. Borda's mouthpiece running free
3. Borda's mouthpiece running full
4. External mouthpiece
What is the correct sequence of these devices by decreasing magnitude of coefficient of discharge?
A.
2, 3, 1 and 4
B.
4, 3, 1 and 2
C.
4, 1, 3 and 2
D.
2, 1, 3 and 4
Answer ( Option B)

4, 3, 1 and 2

Solution

Co-efficient of discharge for,
(i) External mouthpiece, (Cd = 0.855)
(ii) Internal (Borda's) mouthpiece, running full, (Cd = 0.707)
(iii) Internal (Borda's) mouthpiece, running free, (Cd= 0.50)
(iv) Orifice, (Cd = 0.62)
(v) Convergent or convergent-divergent, (Cd=1.0)

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