Mechanical Engineering - MCQ Practice Questions
Core mechanical MCQs — thermodynamics, SOM, fluid mechanics for GATE & PSUs.
259 questions | 100% Free
What is the significance of the 'Hertzian stress' in rolling contact bearings?
In a threaded fastener assembly, if the preload is 50 kN and external load is 30 kN, with a stiffness ratio of 0.5, what is the actual stress in the bolt?
A ball bearing with dynamic load rating C = 8000 N is subjected to a radial load of 2000 N. What is the approximate L10 life in millions of revolutions?
A bolted joint is subject to a tensile load of 50 kN. If the bolt diameter is 16 mm and material is Grade 8.8, what is the safety factor? (Assume tensile strength = 640 MPa)
For a long slender column subjected to axial compression, buckling occurs when the load reaches the critical value. Which parameter has the MOST significant influence on critical load?
A tapered roller bearing is subjected to combined radial and thrust loads. How should the equivalent bearing load be calculated?
In a cam-follower system, which type of follower motion profile minimizes shock and vibration?
A spring is subjected to a tensile stress of 600 MPa. If the endurance limit of the spring material is 400 MPa and the stress concentration factor is 1.8, what is the factor of safety against fatigue?
In a power screw design, if the pitch is 5 mm, major diameter is 20 mm, and the coefficient of friction is 0.15, what is the efficiency of the screw?
In gear tooth bending stress analysis according to Lewis equation, which parameter does NOT directly affect the bending stress?
A cone clutch has cone angle 15°, outer radius 150 mm, inner radius 100 mm, and coefficient of friction 0.25. Find the torque capacity for 3000 N axial force.
In a multi-plate friction brake with n = 8 plates, coefficient of friction μ = 0.35, and plate radius R = 200 mm, find braking torque for 5000 N axial force.
A V-belt pulley has groove angle 36°. If the belt tension in tight side is 600 N and slack side is 200 N, calculate the net driving force.
A tapered roller bearing has pitch diameter 80 mm and contact angle 12°. Calculate the radial load capacity factor if axial load is 2000 N.