List of top Mechanical Engineering Questions

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

Angle of twist of a shaft of diameter 'd' is inversely proportional to

For an air refrigeration cycle, COP improves when

The ratio of modulus of rigidity to modulus of elasticity for a Poisson's ratio of 1 would be

What is the main cause of irreversibility in thermodynamic processes?

In a concentric tube counter flow heat exchanger, hot oil enters at $102\text{ }^{\circ}\text{C}$ and leaves at $65\text{ }^{\circ}\text{C}$. Cold water at $25\text{ }^{\circ}\text{C}$ and leaves at $42\text{ }^{\circ}\text{C}$. The log mean temperature difference (LTMD) is _______}

A solid cylinder of diameter 100 mm and height 50 mm is forged between two frictionless flat dies to a height of 25 mm. The percentage change in diameter is

Which dimensionless number characterizes the ratio of convective to conductive heat transfer in a fluid?

Which of the following processes is an example of an isothermal process?

In a Diesel cycle, the parameter that affects efficiency in addition to compression ratio is

Determine the atmospheric pressure at a location where the barometric reading is 700 mmHg and the gravitational acceleration is $g = 10 \text{ m/s}^2$. Assume the mercury density is $14000 \text{ kg/m}^3$.

The control volume approach in fluid mechanics is primarily used to analyse:

What happens to the entropy of a pure substance during a phase change at constant temperature and pressure?

In free convection, which dimensionless number represents the ratio of buoyancy forces to viscous forces?

The truss which follows the law $n =$ _________ is known as simple truss

What happens to the total potential energy of a system if the external work done by applied loads is greater than the increase in internal strain energy?

A solid uniform metal bar of diameter D and length L is hanging vertically from its upper end. The elongation of the bar due to self-weight is

Consider an ideal vapour compression refrigeration cycle working on R-134a refrigerant. The COP of the cycle is 10 and the refrigeration capacity is 150 kJ/kg. The heat rejected by the refrigerant in the condenser is _______ kJ/kg.

The critical speed of a rotating shaft depends on

Which of the following is NOT a characteristic of a transportation problem?

The activities of W, X, Y and Z are the direct precursors of A. What is the earliest starting time for A, if the activities of earliest finishing times are 12, 15, 10 and 6?

Which of the cost estimates and performance measures are not used for economic analysis of a queuing system?

In a graphical solution of solving Linear Programming Problem to convert inequalities into equations, they

The penalty of a row in a transportation problem is obtained by

The pessimistic time and optimistic time of completion of an activity are given as 10 days and 4 days respectively. Then the variance of the activity is