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GATE Prev Year : Machine Design Test-5

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Question 1

The S-N curve for steel becomes asymptotic nearly at

Question 2

Two mating spur gears have 40 and 120 teeth respectively. The pinion rotates at 1200 rpm and transmits a torque of 20 N.m. The torque transmitted by the gear is

Question 3

A block–brake shown below has a face width of 300 mm and a mean co–efficient of friction of 0.25. For an activating force of 400 N, the braking torque in Nm is
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Question 4

The life of a ball bearing at a load of 10 kN is 8000 hours. Its life in hours, if the load is increased to 20 kN, keeping all other conditions the same, is

Question 5

A bracket (shown in figure) is rigidly mounted on wall using four rivets. Each rivet is 6mm in diameter and has an effective length of 12mm.
$Description: D:\GradeStack Courses\GATE Tests (Sent by Ravi)\GATE EC-ME-17-Mar\GATE-ME-2010_files\image086.png$
Direct shear stress (in MPa) in the most heavily loaded rivet is

Question 6

A bolt of major diameter 12 mm is required to clamp two steel plates. Cross sectional area of the threaded portion of the bolt is 84.3mm². The length of the threaded portion in grip is 30 mm, while the length of the unthreaded portion in grip is 8 mm. Young's modulus of material is 200 GPa. The effective stiffness (in MN/m) of the bolt in the clamped zone is ______

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ESE & GATE ME Machine Design

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