Engineering Sciences
GATE XE topic:mechanics-rigid-bodies PYQs
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Questions 71–72 of 72. Imported answers require independent review unless marked reviewed.
Question 69
Open questionXE-DNAT2 marksNeeds review
A manually operated band brake has a control lever EFG as shown and has a coefficient of kinetic friction equal to 0.2. The cylinder initially rotates clockwise at a constant frequency of 10 revolutions per second. A force P = 300N is applied at G. The pin support at O is frictionless. The radius of the cylinder is
and the radius of gyration is 0.1m. The mass of the cylinder is 50kg. Assume acceleration due to gravity
. The time required (in seconds) to reduce the rotational frequency to 5 revolutions per second is __________. 
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Open questionXE-DNAT2 marksNeeds review
In a pin-connected mechanism shown, load P applied at F is 50N. Neglect the weight of the links and assume
for the spring. The bars EH and FG are pinned at O at their centre such that the lengths of EO, GO, HO and FO are all equal to
. The spring between G and H is unstretched when
. The angle
(in degrees) under equilibrium is __________. 
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