ISRO Mechanical Engineering 2020

The laws of adhesive wear, commonly referred to as Archard’s law can be expressed as _____.
If ‘Q’ is the total volume of wear debris produced, ‘W’ is the normal load, ‘L’ is the sliding distance, ‘H’ is the hardness of the softest contacting surface being worn away, and ‘k’ is a non- dimensional wear coefficient dependent on the materials in contact and their exact degree of cleanliness)

In a four-bar linkage if ‘S’ is the length of the shortest link, ‘L’ is the length of longest link and ‘P’ & ‘Q’ are length of other links, then the criteria for getting a triple rocker mechanism in which no links will fully rotate is.

The piston of an engine moves with simple harmonic motion. The crank rotates at 120 rpm with a stroke of 2 meters. The velocity of the piston, when it is at is at a distance of 0.8 metre from the center is.

If a block slides outwards on a link at a uniform rate of 30 m/s, while the link is rotating at a constant angular velocity of 50 rad/s counter clockwise, the Coriolis component of acceleration is ______ m/s2.

IN a screw jack of lead angle α, the effort required to lift the load W is given by _____

If, Kf is the fatigue stress concentration factor and Kt is the theoretical stress concentration factor then, the notch sensitivity q is?