Mechanical Engineering - MCQ Practice Questions
Core mechanical MCQs — thermodynamics, SOM, fluid mechanics for GATE & PSUs.
259 questions | 100% Free
A submerged gate in a canal discharges water at the bottom. The discharge through the gate is given by Q = Cd × A × √(2g(h₁-h₂)), where Cd is discharge coefficient, A is gate area, and (h₁-h₂) is head difference. Typical value of Cd for a sharp-edged gate is:
The Froude number Fr = V/√(gD) for channel flow determines the flow type. For Fr = 0.8, the flow is classified as:
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?
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 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?
A cast iron machine bed is subjected to fluctuating loads. Which material property is MOST important for its long-term reliability?
A gear pair is designed with a contact ratio of 1.4. What does this indicate about the gear mesh?
A coupling is required for a motor-pump assembly where slight misalignment and vibration are expected. Which coupling type is MOST suitable?
In the design of a flat belt drive, what is the primary criterion for determining the belt width?
In spring design, what is the primary effect of shot peening on the fatigue strength of a spring?
A V-belt drive shows signs of slipping. Which of the following is NOT a likely cause?
In a brake design, which material property is MOST critical for brake pad selection?