Mechanical Engineering Answers

a rigid vessel of volume 1m (^3) contains steam at 20bar and 400 degrees Celcius. The vessel is cooled until the steam is just dry saturated. Calculate the mass of steam in the vessel, the final pressure of the steam and the heat rejected during the process.

A system contains 0.25 m3 of air pressure of 4.8 bars and 160⁰ C. It is expanded adiabatically till the pressure falls to 1.5 bar. The air is then heated at a constant pressure till its enthalpy increases by 80 kJ. Sketch the process on a P-V diagram and determine the total work done. Use Cp=1.005 kJ/kg.K and Cv=0.714 kJ/kg.K

The viscosity between two parallel plates with a distance of 1 mm between them is 0.01 kg/mxs is an oil. Bottom plate 3 m/S to the left base plate right (2+A) M/S is rapidly pulled. a) find the force that should be applied to the top plate with a field of 1+B(m^2) as newton. b ) find the location ( distance from the lower surface) of the point where the fluid velocity is.chegg

Find the flow velocities v1, v2 and v3 in the conduct shown in Fig. 5.25. The flow rate Q is 800 L/min and the diameters d1, d2 and d3 at sections 1, 2 and 3 are 50, 65 and 100 mm, respectively.

A system contains 0.25 m3 of air pressure of 4.8 bars and 160⁰ C. It is expanded adiabatically till the pressure falls to 1.5 bar. The air is then heated at a constant pressure till its enthalpy increases by 80 kJ. Sketch the process on a P-V diagram and determine the total work done. Use Cp=1.005 kJ/kg.K and Cv=0.714 kJ/kg.K

Ms.begets car, which weights 1,000kg, it has run out of gas. Ms.begets is trying to push the car to a gas station, and she makes the car go 0.05 m/s/s. Calculate how much force ms.begets is applying to the car

An electric motor drives a co-axial rotor through a
single-plate clutch, which has two pairs of driving
surfaces, each of 275mm external and 200mm internal
diameter, the total spring load pressing the plates
together is 500N. The mass of the motor armature and
shaft is 800kg and its radius of gyration is 260mm; the
rotor has a mass of 1350kg and its radius of gyration is
225mm.
The motor is brought up to a speed of 1250rev/min; the
current is then switched off and the clutch suddenly
engaged. Determine the final speed of the motor and
rotor, and find the time taken to reach that speed and
the kinetic energy lost during the period of slipping.
How long would slipping continue if a constant torque
of 50Nm were maintained on the armature shaft? Take
=0.35

a vessel of .03m^3 capacity contains a mixture of air and steam which is 0.75 dry . if pressure is 7 bar and temperature is 116.9C calculate mass of water present , mass of dry saturated vapor and mass of air.

Some forces act on an object with a mass of 20 kg, as shown in the figure below.
Determine the object’s acceleration.

Which two questions can be used to identify time and cost constraints on the

design of a heavy industrial machine?