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Question

Design of Machine Elements Question on Efficiency of Screws

The maximum efficiency in a Screw Jack is given as:

A

1+cosϑs1−cosϑs\frac{1+ cos\vartheta_s}{1-cos \vartheta_s}

B

1−cosϑs1+cosϑs\frac{1-cos\vartheta_s}{1+cos \vartheta_s}

C

1+sinϑs1−sinϑs\frac{1+sin \vartheta_s}{1-sin \vartheta_s}

D

1−sinϑs1+sinϑs\frac{1-sin \vartheta_s}{1+sin \vartheta_s}

Answer

1−sinϑs1+sinϑs\frac{1-sin \vartheta_s}{1+sin \vartheta_s}

Explanation

Solution

The correct option is (D): 1−sinϑs1+sinϑs\frac{1-sin \vartheta_s}{1+sin \vartheta_s}