List of top Mechanical Engineering Questions

What is the primary reason for using a key in shaft and gear assemblies?
In a clock mechanism, hour and minute hands are connected by _________ gear train.
The Number of Transfer Units (NTU) method is primarily used to:
Water (\(C_{\text{p}} = 4.18\text{ kJ/kg}\cdot\text{K}\)) at \(80^\circ\text{C}\) enters a counter-flow heat exchanger with a mass flow rate of \(0.5\text{ kg/s}\). Air (\(C_{\text{p}} = 1\text{ kJ/kg}\cdot\text{K}\)) enters at \(30^\circ\text{C}\) with a mass flow rate of \(2.09\text{ kg/s}\). If the effectiveness of the heat exchanger is 0.8, the LMTD (\(^\circ\text{C}\)) is
Fatigue failure occurs due to
If a heat exchanger has effectiveness = 1, it means:
During heat treatment of steel, the hardness of various structures in increasing order is
The continuity equation for an incompressible fluid states that:
In a project network, two parallel activities start from the same node and merge at the same succeeding node. Their durations are: Activity A = 6 days, Activity B = 9 days. Which statement is correct?
A rod of steel of \(1\text{ cm}^{2}\) in cross-sectional area and \(100\text{ cm}\) long is subjected to an axial pull of \(20000\text{ N}\). If \(E = 20 \times 10^{6}\text{ N/cm}^{2}\), the elongation will be
The relative humidity of ambient air at \(300\text{ K}\) is \(50\%\) with a partial pressure of water vapour equal to \(P_{\text{v}}\). The saturation pressure of water at \(300\text{ K}\) is \(p_{\text{sat}}\). The correct relation for the air-water mixture is
A hole of $25\text{H}_7$ is to be checked. IT7 tolerance = $0.021\text{ mm}$. Hole limits are:
A 50 mm diameter disc is to be punched out from a carbon steel sheet 1.0 mm thick. The diameter of the punch should be
Which aggregate production planning strategy focuses on maintaining a stable workforce and using inventory to absorb demand fluctuations?
In the Basic Economic Order Quantity (EOQ) model, if the holding cost per unit increases, the EOQ will:
The emissivity of a grey surface is:
A cantilever beam of rectangular cross section is subjected to a load W at its free end. If the depth of the beam is doubled and the load is halved, the deflection of the free end as compared to original deflection will be _______.
What is the name of the surface that is generated with linear interpolation of two curves?
What is the significance of availability (or exergy) in thermodynamics?
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'?
Maximum velocity in laminar flow in a pipe is
The logarithmic mean temperature difference (LMTD) method is used to:
Match the processes with their characteristics:
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?
In a probabilistic inventory model, which distribution is commonly used to model demand?