List of top Mechanical Engineering Questions

The thermal stress in terms of modules of elasticity(E), co-efficient of thermal expansion(\(\alpha\)), Temperature(T) is given by

Which of the following is NOT a primary mechanism of material removal in Electrical Discharge Machining (EDM)

A liquid of specific gravity 1.0 flows in a pipe at a rate of 900 lit/s, from point 1 to point 2 which is 1 m above point 1. The areas at section 1 and 2 are 0.6 m\(^2\) and 0.3 m\(^2\) respectively. If the pressure at section 1 is 20 kPa, determine the pressure at section 2. (Assume g = 10 m/s\(^2\))

Consider a large cubic ice block floating in water with top surface of the ice block parallel to the surface of the sea. The specific gravities of ice and seawater are 0.9 and 1.0, respectively. If a 20-cm-high portion of the ice block extends above the surface of the water, determine the height of the ice block below the surface.

Which type of bearing is best suited for high-speed applications with moderate radial loads?

In the case of bi-axial state of normal stresses, the normal stress on 45\(^\circ\) plane is equal to ________.

In turbulent flow through a pipe, the Reynolds number is typically:

In Mohr's circle for plane stress, what do the points on the circle represent?

The device used to demonstrate laminar and turbulent flow in pipes is:

Which of the following is a key assumption in linear programming?

For an air-standard Otto cycle, the compression ratio is 8 and the ratio of specific heats (\(\gamma\)) is 1.4. The air-standard efficiency of the cycle is _______.

A closed system undergoes a process in which it interacts with the surroundings maintained at \(T_{0} = 300\text{ K}\) and \(P_{0} = 100\text{ kPa}\). During the process:
\(\bullet\) The system receives 1000 kJ of heat from a reservoir at 1200 K.
\(\bullet\) The system does 500 kJ of boundary work on the surroundings.
\(\bullet\) There is no change in kinetic or potential energy, and the process ends at the dead state (equilibrium with surroundings).
Which of the following statements is most correct?

The number of atoms per unit cell and the number of slip system, respectively, for a face-centered cubic (FCC) crystal are

Computer Integrated Manufacturing (CIM) primarily refers to

What is the main difference between annealing and tempering?

Which comparator type uses a dial indicator to measure deviations from a standard?

Air enters an adiabatic nozzle at 300 kPa and 500 K with a velocity of 10 m/s. It leaves the nozzle at 100 kPa with a velocity of 180 m/s. The specific heat of air \(C_{\text{p}} = 1008\text{ J/kg}\cdot\text{K}\). The exit temperature of air is

In a counter flow heat exchanger, hot fluid enters at \(120^\circ\text{C}\) and leaves at \(80^\circ\text{C}\). Cold fluid enters at \(20^\circ\text{C}\) and leaves at \(60^\circ\text{C}\). Find the log mean temperature difference (LMTD).

For an ideal Rankine cycle operating between pressure of 30 bar and 0.04 bar the work output from the turbine is 903kJ/kg and the work input to the feed pump is 3kJ/kg. The specific steam consumption is ________ kg/kWh

In the entrance region of a pipe, the boundary layer grows and the inviscid core accelerates. This is accompanied by the fluid's pressure drop per unit length is

A shaft is required to transmit a power of 25 kW at 360 rpm. The force analysis due to attached parts results in Bending Moment of 830 Nm at a section between bearings. If permissible stresses in the shaft are 60 N/mm\(^2\) in bending and 40 N/mm\(^2\) in shear, calculate the diameter of the shaft.

Which of the following processes is isobaric?

Consider a simple gas turbine (Brayton) cycle and a gas turbine with perfect regeneration. In both the cycles, the pressure ratio is 6 and the ratio of the specific heats of the working medium is 1.4. The ratio of minimum to maximum temperatures is 0.3 (with temperatures expressed in K) in the regenerative cycle. The ratio of the thermal efficiency of the simple cycle to that of the regenerative cycle is

Heat transfer of 800 kJ occurs from a source at 500 K to surroundings at 300 K. Calculate maximum available work.

What is the significance of the "instantaneous center of zero velocity" in mechanism analysis?