Mechanical Engineering - MCQ Practice Questions
Core mechanical MCQs — thermodynamics, SOM, fluid mechanics for GATE & PSUs.
259 questions | 100% Free
Which of the following is the primary function of a key in mechanical design?
In gear design, what does the term 'Module' represent?
Which bearing type is most suitable for high-speed applications with moderate loads?
The fatigue strength of a material is typically determined at how many cycles of stress reversal?
A welded joint is subjected to a tensile load of 50 kN. If the weld has a size of 6 mm and length of 100 mm, what is the average shear stress in the weld?
Which of the following factors does NOT directly influence the selection of a coupling?
In screw thread design, what does the pitch angle represent?
A shaft is designed for a combined bending moment of 1000 Nm and a torque of 800 Nm. Using the maximum shear stress theory, the equivalent torque is approximately:
Which type of fit is used when a permanent assembly is required with no relative motion?
In a belt drive system, the belt tensions on the tight side and slack side are 1200 N and 400 N respectively. What is the power transmitted at 600 RPM with a pulley diameter of 200 mm?
What is the primary purpose of using a stress concentration factor (Kt) in fatigue analysis?
In rolling contact bearings, what does the 'L10 life' represent?
A hollow circular shaft has outer diameter 50 mm and inner diameter 30 mm. Calculate the polar moment of inertia.
Which surface finish is typically required for bearing bore surfaces?
In a riveted joint, if the shear strength of rivet material is 300 MPa and bearing strength is 400 MPa, which failure mode would occur first for a single rivet with 16 mm diameter?
What is the significance of the 'Hertzian stress' in rolling contact bearings?
In power screw design, what does the 'efficiency' of a screw represent?
A spur gear with 60 teeth and module 2 mm meshes with a pinion. If the center distance is 90 mm, how many teeth does the pinion have?
Which material property is MOST critical for designing a component subjected to cyclic loading?
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?