List of top Mechanical Engineering Questions

A bicycle and rider have a combined mass of 100 kg traveling at 12 km/hr on a level road. A brake is applied to the rear wheel which has 800 mm in diameter. The pressure on the brake is 80 N and the coefficient of friction is 0.05. The distance covered by the bicycle before it comes to rest will be approximately equal to
In hydrodynamic journal bearing, if the clearance ratio is halved then the Sommer field number 'S' and the coefficient of friction '$ \mu $' will change as
The deflection of a spring with 20 active turns for the specified load is 10 mm. If the same spring is cut into two halves and connected parallel and applied the same load, then the deflection would be
What is the failure theory to be considered for the loading of aluminum components under steady load conditions?
While designing the gears, the Lewis equation is generally used for finding out the following stress?
The endurance limit for the carburized machine components is high because
A free damped vibrating system consists of a mass of 200 kg and a spring of stiffness 40 N/mm. If the damping factor is 0.22, the time in which the system would settle down 10$^\text{1/50}$th of its initial deflection will be:
If the damping factor of the vibrating system is considered as unity, then the type of system is said to be
In the analysis of torsional vibrations of the shaft, the node of the shaft is characterized by the:
During the design of a gear, if the higher-pressure angle is chosen, then the gear has:
For the specified flywheel design, the variation of the engine speed is from 210 rad/s to 190 rad/s. During the cycle process, the change in kinetic energy is found to be 400 N-m, then the moment of inertia of the flywheel in kg-m² is:
The total reaction on the ground when wheels of the vehicle are subjected to the gyroscopic couple and the centrifugal force while negotiating the curve is
The point on the cam at which the pressure is maximum is known as:
In the case of balancing problems pertaining to locomotives, the resultant unbalanced force is minimum when:
In a slider crank mechanism for $ \frac{l}{4} $ ratio of 4, the percentage of stroke converted by the piston corresponding to 90° movement of the crank from top dead center is
A shaft subjected to pure torsion develops the maximum shear stress of 80 MPa. If the shaft diameter is doubled, then the maximum shear stress developed in the shaft corresponding to the same torque is
A thin cylindrical shell subjected to an internal pressure resulted in hoop stress and longitudinal stress. If the radius and thickness of the shell are increased by 10%, then the increase in percentage of hoop stress and longitudinal stress respectively are
A simply supported beam of length 'L' having the flexural rigidity of 'EI', subjected to a uniformly distributed load of 'w'. Then the maximum bending moment and maximum deflection are
Based on flexural point, a beam can be considered as strongest due to:
The ratio of equivalent lengths for the slender column subjected to the critical load when one end is fixed and the other is free, and both ends are fixed is:
The relation between number of links $ (l) $ and number of joints $ (j) $ in a kinematic chain is generally
The extension due to self-weight of a bar of uniform cross section being hanged vertically downward is ___ times the extension produced by the same weight applied at the lower end of the vertical bar.
What is the coefficient of restitution of a perfectly elastic impact?
If the coefficient of friction between tyres and the road is 0.6, what is the angle of banking for a highway curve of 500 m radius designed to accommodate cars travelling at 180 km/h?
Which of the following relations are correct for the Young's modulus in terms of modulus of rigidity (G), Bulk modulus (K) and Poisson's ratio ($\mu$)?