Engineering Sciences
GATE XE concept:friction PYQs
Build your understanding with focused practice from past exam papers.
Questions 11–13 of 13. Imported answers require independent review unless marked reviewed.
Question 11
Open questionXE-DMCQ2 marksNeeds review
A horizontal effort
is applied to raise a block of weight
on a rough surface inclined at an angle
with the horizontal. If
is the coefficient of static friction between the block and the surface, the minimum effort
required to impend the upward motion of the block along the surface is 
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Open questionXE-DNAT2 marksNeeds review
Two rigid blocks, of masses 10kg and 15kg, are arranged one on top of the other and placed on a horizontal rough surface as shown. The blocks are connected to each other through an inextensible cable passing over a frictionless pulley. The coefficients of static friction between the blocks and also between the bottom block and the surface are all equal to 0.3. The force
(in Newtons) needed to set the blocks in motion towards right is _________. (Assume acceleration due to gravity
). 
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 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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