List of top Mechanical Engineering Questions

Two shafts A and B are made up of the same material. The diameter of the shaft A is twice as that of shaft B. The power transmitted by the shaft A will be 'X' times of shaft B. What is the value of 'X'?

A mould cavity of $1200\text{ cm}^3$ volume has to be filled through a sprue of $10\text{ cm}$ length feeding a horizontal runner. Cross-sectional area at the base of the sprue is $2\text{ cm}^2$. Consider acceleration due to gravity as $9.81\text{ m/s}^2$. Neglecting frictional losses due to molten metal flow, the time taken to fill the mould cavity is}

The logarithmic mean temperature difference (LMTD) method is used to:

What is the name of the surface that is generated with linear interpolation of two curves?

A bar having a cross sectional area of $700\text{ mm}^2$ is subjected to axial loads at the positions indicated in figure. Find the value of stress in the segment QR?

For a closed, simple compressible system, which of the following thermodynamic relations is always valid, irrespective of the process, assuming only reversible processes and equilibrium states?

A solid sphere has characteristic length $L_c = 0.02\text{ m}$, thermal conductivity $K = 40\text{ W/mK}$, and convective heat transfer coefficient $h = 10\text{ W/m}^2\text{K}$. Find the correct statement.

What is the main difference between PERT and CPM?

Match the processes with their characteristics:

In a probabilistic inventory model, which distribution is commonly used to model demand?

Air (ideal gas) enters a perfect insulated compressor of a temperature of 310 K. The pressure ratio of compressor is 6, Specific heat at constant pressure for air 1005 J/kgK and ratio of specific heats at constant pressure and constant volume is 1.4. Assume that specific heat of air is constant. If the isentropic efficiency of the compressor is 85 percent, the difference in enthalpies of air between the exit and inlet of the compressor is _______

Which forecasting method is most appropriate when the data exhibits trend but no seasonality?

The Reynolds number for flow of oil through a 1 cm diameter pipe is 1000. The kinematic viscosity, $\nu = 1.0 \times 10^{-6} \text{ m}^2/\text{s}$. What is the velocity at a point 0.25 cm away from the wall?

Two beams of equal cross sectional areas are subjected to equal bending moment. If one beam has square cross section and the other has circular section, then

Virtual work method is particularly useful for analysing

What is the primary cause of buoyant force acting on a submerged object?

If the coefficient of friction between brake lining and drum decreases, the braking effort required

A strip of 200 mm wide and 10 mm thick is reduced to 8 mm in one pass. Roll diameter = 100 mm, average flow stress = 200 MPa. Rolling load is:

A surface behaves as a perfect black body at 600 K. Another black body is at 300 K. The ratio of emissive powers is:

A cylinder contains $5\text{ m}^3$ of an ideal gas at a pressure of 1 bar. The gas is compressed in a reversible isothermal process until the pressure increases to 5 bar. Determine the work required for this compression (kJ).

In a Carnot cycle, which process occurs between the two isothermal processes?

The virtual work done by external active forces on an ideal mechanical system in equilibrium is ______ for any and all virtual displacements consistent with the constraints.

One kg of air, initially at a temperature of $127\text{ }^{\circ}\text{C}$ expands reversibly at a constant pressure until the volume is doubled. If the gas constant of air is $287\text{ J/kg K}$, the magnitude of work transfer is _______ kJ.

A cylindrical vessel is said to be thin if the ratio of its internal diameter to the wall thickness is

In rolling of metals, when reduction per pass is increased while all other conditions are kept constant, the required rolling force