List of top Mechanical Engineering Questions

If a radial ball bearing has a basic load rating of \(50 \text{ kN}\) and desired rating life is \(6000 \text{ hours}\), then the equivalent radial load that the bearing can carry at \(500 \text{ rpm}\) is

In Rayleigh's method, which of the following energy at the mean position is equal to the maximum potential energy (or strain energy) at the extreme position?

Consider a single degree of freedom system with viscous damping excited by a harmonic force. At resonance, the phase angle of the displacement with respect to the exciting force in degrees is

Assume that the connecting rod and the crank of an engine forms as two sides of the triangle. If the area included in the triangle is maximum when the crank is at $60^\circ$, then the ratio of length of connecting rod to the radius of the crank is

In a given mechanism, the number of links are five. Then the number of instantaneous centres of the mechanism is

A flywheel is designed for engine speed variation from $190\text{ rps}$ to $210\text{ rps}$. Calculate the inertia of the wheel if the kinetic energy stored in the flywheel is $400\text{ N}\cdot\text{m}$.

The minimum number of teeth on the pinion in order to avoid interference for $20^\circ$ full depth involute system is

Based on the limiting factor to prevent bursting in thin cylinder, the design is primarily made based on which stress

A tapering bar varying from the diameters from `d\(_1\)' to `d\(_2\)' and a bar of uniform cross section `d' have the same length and subjected to same axial pull attains the same extension. Then the `d' is equal to

A circular shaft has been designed for the twisting moment of $5\text{ kN}\cdot\text{m}$. If the twisting moment is reduced to $4\text{ kN}\cdot\text{m}$, then what will be the maximum value of bending moment that can be applied for the same designed condition?

A long steel column of uniform cross section is subjected to a crippling load of $10\text{ kN}$ as per the Euler designed condition. If the length of the column is reduced to half, then what would be the maximum Euler's crippling load?

Two bars A and B made of different material have same length. The coefficient of expansion and Young's modulus of bar B is twice that of bar A. If the temperature of both bars is increased by the same amount while preventing any expansion, then the ratio of stress developed in bar A to that in bar B is

The simple truss structure is shown below. The forces acting in the members AB and BC respectively are

If the double threaded square screw is having mean diameter \( 8\text{ cm} \) and pitch \( 2\text{ cm} \), then the lead of the double threaded square screw is

If a particle has the initial velocity of \( v_0 = 12\text{ m/s} \) to the right at \( S_0 = 0 \). Then what is the position when \( t = 10\text{ s} \) and \( a = 2\text{ m/s}^2 \) to the left?

The relation of three elastic constants of a metal in terms of Young's Modulus (E), Modulus of rigidity (G) and Bulk Modulus (K) is expressed as

Which planes carry maximum normal stress and what is shear stress on these planes

The range of projectile is maximum when the angle of projection is

Two equal forces each of magnitude P acting at a point with an angle of \( (\alpha) \), then the resultant force is

Three coplanar equilibrium forces \( P = 40\text{ N} \), \( Q = x\text{ N} \) and \( R = y\text{ N} \) are acting on a body and the body is said to be in equilibrium when the angle included between each other is \( 120^\circ \), then \( x = \)

Which of the following is not the property of a distribution function \( F(x) \) of a random variable \( X \)?

If the particular integral of \( y'' - 4y' = x^2 e^{2x} \) is in the form \( y_p = e^{2x} y(x) \), then \( y(x) \) is

\( \mathcal{L}\{ \sin(t-3)u(t-3) \} = \)

The Laurent's series for the function \( f(z) = 1 + \frac{3}{z+2} - \frac{8}{z+3} \) in the region \( |z| \lt 2 \) is

Given \( x_0 \neq 0 \), if the iteration formula \( x_{n+1} = \frac{1}{2}\left( -\frac{7}{x_n} + x_n \right) \), \( n \geq 0 \) is used to find the root of \( f(x) = 0 \), then \( f(x) = \)