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

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Question 1

A carbon steel shaft 60 mm diameter is subjected to a fluctuating torque between 1500 Nm to 4000 Nm. Using Soderberg equation, the factor of safety is _________.
[Take, Description: E:\Gate\SSC JE Mechanical Part 1\Made Easy Questions\12_Machine-Design_BLok1_files\image067.png = 600 MPa and Description: E:\Gate\SSC JE Mechanical Part 1\Made Easy Questions\12_Machine-Design_BLok1_files\image068.png = 400 MPa]
Assume, Description: E:\Gate\SSC JE Mechanical Part 1\Made Easy Questions\12_Machine-Design_BLok1_files\image069.png = 0.6 Description: E:\Gate\SSC JE Mechanical Part 1\Made Easy Questions\12_Machine-Design_BLok1_files\image068.png and Description: E:\Gate\SSC JE Mechanical Part 1\Made Easy Questions\12_Machine-Design_BLok1_files\image070.png = 0.5 Description: E:\Gate\SSC JE Mechanical Part 1\Made Easy Questions\12_Machine-Design_BLok1_files\image067.png.

Question 2

A riveted joint (with 4 rivets numbered 1 to 4) as shown in the figure is subjected to eccentric loading. The most and least stressed rivets respectively are____.


Question 3

An eye bolt is to be used lifting a load of 70 KN and the tensile stress is not to exceed 100 MPa. The core diameter of the bolt will be given by:

Question 4

Single plate clutch with an outside diameter 250 mm and the inside diameter of 100 mm is subjected to a uniform pressure of 1 MPa. The coefficient of friction between the rubbing surfaces is 0.2. The power transmit at 1000 rpm (in kW) is.

Question 5

The following data is given for a hydrodynamic bearing:
Length to diameter ratio- 1
Journal speed- 1500 rpm
Diametric clearance-
Journal diameter- 50 mm
External load- 6 kN
The value of minimum film thickness variable is 0.4 and corresponding Sommerfeld number is 0.121. The viscosity (in centipoise) of oil that need to be used is

Question 6

A journal bearing is loaded with a radial load of 30 kN. The journal diameter and length both are 100 mm and it rotates at 1200 rpm. The heat is dissipated from the surface at the rate of 96 J/m2/sec./ °c. The bearing housing is 20 times the projected area. If coefficient of friction is 0.003 and room temperature is 35 °c, then the surface temperature of the bearings is _____ °c.
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