List of top Mechanical Engineering Questions

In a CNC machine tool, encoder is used to sense and control:

When a control signal is generated proportional to rate of change of position error, the controller is:

The lead time is defined as:

In a machining operation, doubling the cutting speed reduces the tool life to \(\frac{1}{8}\) of the original value. The exponent ‘n’ in Taylor’s tool life equation \(VT^n = C\) is:

Tolerances are specified in manufacturing parts:

Two identical circular rods of same diameter and length are subjected to same axial tensile force. One is mild steel and other aluminium. Which is correct?

The difference between dry bulb temperature and wet bulb temperature is called:

Green sand mould indicates that:

A petrol engine has compression ratio from:

For a hemispherical furnace with a flat circular base of diameter \(D\), the view factor from dome to its base is:

If a body is at 1727°C, the wavelength at which the body emits maximum radiation is:

Power required in overcoming the viscous resistance in case of shaft in oiled bearing is: where \(\mu\) = coefficient of viscosity, \(D\) = diameter of shaft, \(N\) = angular velocity in RPM, \(L\) = length of shaft, \(t\) = thickness of oil

The speed of sound of carbon monoxide (CO) at 200 kPa pressure and 300°C in m/s is: (Properties of CO: molecular weight = 28.01, \(k = 1.4\))

How many zero force members are there in the truss shown in figure?

A 1 kg block is resting on a surface with coefficient of friction \(\mu = 0.1\). A force of 8 N is applied to the block as shown in figure. The friction force is:

According to maximum shear stress theory, the yield strength in shear \((\tau_s)\) and yield strength in tension \((\sigma_t)\) is related as:

A shaft was initially subjected to bending moment and then subjected to torsion. If the magnitude of bending moment is same as that of torque, the ratio of maximum bending stress to shear stress would be:

What is the effect of mass of spring \(m_s\) on equivalent mass \(M\) of system with mass \(m\)?

Using Runge-Kutta method of fourth order, an approximate value of \(y\) at \(x=0.2\), given that \(\frac{dy}{dx}=\frac{y^2-x^2}{y^2+x^2}\) and \(y(0)=1\), is:

The function of a governor is to:

The value of \(\displaystyle \int_C (xy + y^2)\,dx + x^2\,dy\), where \(C\) is bounded by \(y=x\) and \(y=x^2\), is:

The value of \(\Gamma\left(\frac{1}{2}\right)\) is:

The transformed equation of \( \frac{\partial^2 u}{\partial x^2} + \frac{\partial^2 u}{\partial y^2} = 0 \) in polar coordinates is:

The volume of the solid bounded by the planes \(x=0\), \(y=0\), \(z=0\) and \(x+y+z=2\) is:

If the probability of a bad reaction from a certain injection is \(0.001\), then the chance that out of 2000 individuals more than two will get a bad reaction is given by: