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mechanical engineering steam nozzles and turbines
1. A nozzle is said to be a convergent nozzle
(A): none of the above
(B): when the cross-section of the nozzle decreases continuously from entrance to exit
(C): when the cross-section of the nozzle first decreases from entrance to throat and then increases from its throat to exit
(D): when the cross-section of the nozzle increases continuously from entrance to exit
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