Q.

Which of the following is known as Re- entrant mouthpiece?

A. external mouthpiece
B. convergent mouthpiece
C. internal mouthpiece
D. cylindrical mouthpiece
Answer» C. internal mouthpiece
Explanation: according to the position, mouthpieces are classified as an external mouthpiece and internal mouthpiece. if the tube projects inside the tank, it is called an internal mouthpiece or re-entrant or borda’s
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