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GATE 2020: Machine Design Rapid mini mock (App update required to attempt this test)

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Question 1

A Circular bar is subjected to torsional moment of 2kN-m. Find the size of the fillet weld ( in mm) for Circular bar of 50mm. Take allowable torsional shear stress for weld material as 60 N/mm².

Question 2

The uniaxial yield stress of a material is 300 MPa According to von Mises criterion, the shear yield stress (in MPa) or the material is ________.

Question 3

In a concentric spring of same length the ratio of the outer spring diameter to the inner spring diameter is 2 and assume the same spring index, the ratio of the outer spring force to the inner spring force is

Question 4

A plate of width 120 mm has a central hole of 20 mm diameter. The plate is subjected to an axial tensile load of 20 kN. Yield stress is 600 MPa and theoretical stress concentration factor is 3. If factor of safety is 5 then the plate thickness is ____ mm.

Question 5

In a multiple plate clutch the max axial pressure allowed is 0.1 MPa. The inner and outer radii of the clutch plates are 250mm and 500mm respectively. Calculate the axial force for each pair of contact surface.

Question 6

What will be ratio of stiffness of spring 1 to that of spring 2, if spring 2 has coil diameter and wire diameter twice and four times that of spring 1, respectively?

Question 7

The transverse fillet joint is given by Ʈ = P sin θ (sin θ + cos θ)/h l. The maximum shear stress induced is?

Question 8

A machine component is subjected to a flexural stress which fluctuates between + 500 MN/m² and –100 MN/m². Determine the value of minimum ultimate strength according to Soderberg relation. Take yield strength = 0.55 Ultimate strength; Endurance strength = 0.5 Ultimate strength; and factor of safety = 3

Question 9

The value of Tearing resistance, Shearing Resistance, Crushing resistance of Single riveted lap joint of 15 mm plates with 25 mm diameter rivets having a pitch of 48 mm. Assume Permissible tensile stress in plate = 100 MPa, Permissible shearing stress in rivets = 90 MPa and Permissible crushing stress in rivets = 170 MPa

Question 10

A block brake shown in the figure has a face width of 200mm and the face is lined with coefficient of friction 0.33. An activating force P of 400N is applied at the end A of lever. Calculate the braking torque on the wheel when the Fulcrum is located at "o".

Question 11

A ball bearing operating at a load F has 8000 hours of life. The life of the bearing, in hours, when the load is doubled to 2F is

Question 12

A multi-plate clutch has 6 plates on the driving shaft and 5 plates on the driven shaft. The plates are friction lined with ferrodo. Calculate the number of contact pairs in this clutch.

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ESE & GATE ME Machine Design

Oct 21ESE & GATE ME