Mechanical Engi...

Assign the operators to different machines so that the total cost is minimized. Find the value of minimum cost.

The expected life of a ball bearing subjected to a load of 9800 N and working at 1000 rpm is 3000 hours. What is the expected life of the same bearing for a similar load of 4900 N and speed of 2000 rpm?

The band brake shown in the figure is to have a maximum lining presure of 600 kPa, the drum is 350 mm in diameter, and the band width is 100 mm. The coefficient of friction is 0.25 and the angle of wrap is 270°. Band tensions of the brake are

A 1 m³ tank containing air at 25°C and 500 kPa is connected through a valve to another tank containing 5 kg of air at 35°C and 200 kPa. Now the valve is opened, and the entire system is allowed to reach thermal equilibrium with the surroundings, which are at 20°C. final equilibrium pressure of air is:

A vapour absorption refrigeration system is a heat pump with three thermal reservoirs as shown in the figure. A refrigeration effect of 100 W is required at 250 K when the heat source available is at 400 K. Heat rejection occurs at 300 K. The minimum value of heat required (in W) is

An inward flow reaction turbine has external and internal diameters as 2.0 m & 1.0 m respectively. The velocity of flow through the runner is constant & is equal to 3 m/s. Determine the discharge (in m³/s) through the runner, if width of the runner at inlet is 400 mm.

A closed tank of constant volume containing a mixture of water and water vapour with dryness fraction 0.05. This system is heated externally such that the temperature changes from 293 K to 350 K. Using the following data, find the value of heat added into the system. Assume reversibility

A hollow alloy tube 6 m long with an external diameter of 50 mm and internal diameter of 30 mm was found to extend 2.98 mm under a tensile load of 50 kN. Find safe load on the tube used as strut of both ends pined( Up to the nearest integer value) in KN. Take the factor of safety as 3.

The maximum shear stress developed in the bar subjected to tensile stress (2σ) as shown in the figure will be_______.