Question:-
The friction torque for square thread at mean radius while raising load is given by
(w= load, R0 = mean radius, Æ = angle of friction, a = lead angle )
Option (A)
wR0 tan(Æ-a)
Option (B)
wR0 tan(Æ+a)
Option(C)
wR0 tana
Option(D)
wR0 tan Æ
Correct Option:
(B)
Question Solution:
Torque required to raise the load T1 = WR tan(Æ + a)
Torque required to lower load T2 = WR tan(Æ - a).
question-answer-faq-3249