Mechanical Engineering Answers

0.078 kg of a carbon monoxide initially exists at 130 kPa and 120oC. The gas is then expanded polytropically to a state of 100 kPa and 100oC. Sketch the P-V diagram for this process. Also determine the value of n (index) and the boundary work done during this process.

A system contains 0.15 m3 of air pressure of 3.8 bars and 1500 C. It is expanded adiabatically till the pressure falls to 1.0 bar. The air is then heated at a constant pressure till its enthalpy increases by 70 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

A 0.5 m3 rigid tank contains refrigerant-134a initially at 200 kPa and 40 percent quality. Heat is now transferred to the refrigerant until the pressure reaches 800 kPa. Determine (a) the mass of the refrigerant in the tank and (b) the amount of heat transferred. Also, show the process on a P-v diagram with respect to saturation lines.

A piston cylinder device contains 0.2 kg of water initially at 800 kPa
3
and 0.06 m . Now 200 kJ of heat is transferred to the water while its
pressure is held constant. Determine the final temperature of the water. Also, show the process on a T-V diagram with respect to saturation
lines

A circular tank with a diameter at the bottom of D 20 m and with vertical walls been filled with a flow of 240 m3/h. what will be the increase of the tank depth after 15 minutes, assuming a constant flow during this period of time?

. An insulated tank is divided into two parts by a partition. One part of the tank contains 6 kg of an ideal gas at 50°C and 800 kPa while the other part is evacuated. The partition is now removed, and the gas expands to fill the entire tank. Determine the final temperature and the pressure in the tank.

The percentage of microorganisms remaining vs. exposure time to autoclave sterilization process follows % = 70-t*2. The percentage of microorganisms
remaining vs. exposure time to dry heat sterilization process follows % = 80-t*5. At what time both the methods are equally efficient?

How to review test certificate of bolt as per standard IS 1367 part 3 ?

Q15.
The ram of a pile driver has mass 800 kg and is released from rest at a
height of 2 m above the top of a 2400 kg pile. If the ram rebounds to a
height of 0.1 m after a direct central impact with the pile, determine the
following:
(a) the velocity of the pile immediately after impact;
(b) the coefficient of restitution;
(c) the percentage of the energy lost in the impact.

An object of 30 kg is moved with a velocity of 2 m/s on a horizontal smooth surface. What is the velocity of the block for 4 seconds if force of 40 N is applied on it in the direction of force?