List of top Mechanical Engineering Questions

Assertion (A): If \(P = \begin{bmatrix}1 & 4 \\ 2 & 3 \end{bmatrix}\), then \(P^2 - 4P - 5I = 0\).
Reason (R): Every square matrix satisfies its own characteristic equation.

Assertion (A): Any square matrix \(P\) and its transpose \(P^T\) have the same eigen values.
Reason (R): The eigen values of an idempotent matrix are either zero or unity.

Which type of robot possesses two revolute and one prismatic joint?

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

The tactile sensor is used to measure:

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

In sensors, the response time is the time required:

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:

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?

Tolerances are specified in manufacturing parts:

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

A petrol engine has compression ratio from:

Green sand mould indicates that:

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:

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, \(k = 1.4\))

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

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:

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

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:

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:

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: