Time Left - 10:00 mins

GATE 2020: Machine Design Quiz 1 (App update required to attempt this test)

Attempt now to get your rank among 1134 students!

Question 1

In terms of theoretical stress concentration factor (Kt) and fatigue stress concentration factor (Kf), the notch sensitivity ‘q’ is expressed as

Question 2

For a brittle material, subjected to fluctuating loading has stress concentration factor of 1.8 and stress of 200 MPa. Find the fatigue stress concentration factor (take notch sensitivity = 1)?

Question 3

A cold drawn steel bar is subjected to tensile preload of 72 kN. and a pulsating tensile load varying from 0 to 144 kN.
Ultimate tensile strength of the material is 650 MPa. Corrected endurance limit is 316.8 MPa, The diameter of Shaft (in mm) using Goodman line with Factor of safety 2, will be______.

Question 4

A machine component is subjected to variable loading -60 MPa and +60 MPa. If the endurance strength and yield strength for the material are 200 MPa and 300 MPa, respectively, the factor of safety ( based on Soderberg equation) is______.

Question 5

A steel shaft of 75 mm diameter and 630 MPa ultimate tensile strength is subjected to a torque which varies from
1500 N-m to –900 N-m. Assume the yield stress for steel in reversed bending as 510 N/mm2, corrected endurance limit in shear= 128.118 MPa, The factor of safety using Soderberg criteria will be_____.

Question 6

A cylindrical shaft is subjected to an alternating stress of 100 MPa. Fatigue strength to sustain 1000 cycle is 490 MPa. If the corrected endurance strength is 70 MPa, estimated shaft life will be
  • 1134 attempts
  • 4 upvotes
  • 8 comments
Jun 8ESE & GATE ME