Plzzz tell question no 7-b c d part.. (d' is the nuwhanical u'vantage Of
Ans. (b) S m (e) S (d) 5
A pulley system has a velocity ratio and
efficiency of d i agr-Nn Of this
(a) the advantage Of system.
(b) the effort required to raiæ a of N
Ans. (a) 24. (b) N
7. Fig. 3.33 shows a system of fm.r pulleys.
The upper pulleys fixed the
lower two are moutble.
(a) Draw a string Mound the pulleys.
Also show the point of
and direction in which the effort is
(b) What is the velocity ratio of the
(c) How are load and effort of the pulley
(d) What assumption do you make in
arriving at your answer in pall
Ans. (b) 4 (c) load 4 x effort
Assumption: (l) There is no friction in the
pulley bearings, (2) Weight Of lower block Of
pulleys is negligible, (3) The effort is applied
down w ards.