The maximum efficiency of a screw jack is
A. 1−sinφ1+sinφ1−sinφ1+sinφ
B. 1+sinφ1−sinφ1+sinφ1−sinφ
C. 1−tanφ1+tanφ1−tanφ1+tanφ
D. 1+tanφ1−tanφ1+tanφ1−tanφ
Answer: Option A
A. 1−sinφ1+sinφ1−sinφ1+sinφ
B. 1+sinφ1−sinφ1+sinφ1−sinφ
C. 1−tanφ1+tanφ1−tanφ1+tanφ
D. 1+tanφ1−tanφ1+tanφ1−tanφ
Answer: Option A
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