Steam at a pressure of 1.9 MN/m2 and with a temperature of 220oC is expanded to a pressure of 0.32 MN/m2 according to the law PV1.3 = constant. It is then further expanded to a pressure of 0.12 MN/m2. Determine

a. The final condition of the steam
b. The total work done

A 4-cylinder ammonia compressor with a bore 0.04 m & stroke 0.03 m running 2500. The system operates in a simple VCC with evaporating & condensing temperatures zero C & 40 C, respectively generating cooling capacity 5 tons.
Determine:
a. Draw the PH diagram indicating all enthalpies & sp. vol.
b. Piston displacement, m3/sec
c. Suction Volume, m3/sec
d. Volumetric efficiency
e. Mass of refrigerant, kg/sec
f. Work of compressor, kW

Consider a space with a peak load of 18 kW with sensible heat factor, SHF, of the space is equal to 0.65. The space is maintained at 25 deg C and 50% RH. Find the appropriate condition (temperature and RH) of air entering the space. Also estimate the volumetric flow rate required in L/s.

Show your calculations for at least two iterations with assumed inlet temperature of the air, Ta,i.

a) How is 4 industrial revolution related to mechanical engineering?

b) What are 4 industrial Revolution  technologies used in engineering?

this is fluid mechanics question

a)sketch performance curve of a pump on a head against volumetric flow rate axis

b) label shutoff and delivery points.

c) on the same axis sketch a system curve and label operating point.

sketch label and describe of an agitated vessel include the impeller and suggest suitable impeller for a high-viscosity liquid

Carbon dioxide gas [M = 44.01 kg/kmol, R = 0.1889 KJ/(kg.K) & T_cr = 304.2 K] is compressed steadily in a water-cooled compressor from P_R1 = 0.15 and T₁ = 365 K to P_R2 = 2 and T₂ = 580 K at a rate of 6 kg/s. The heat rejected to the cooling water is 1058 kW. Using the generalized charts and ideal gas tables, the required power input to the compressor in kW is:

this is fluid mechanics question

a)sketch performance curve of a pump on a head against volumetric flow rate axis

b) label shutoff and delivery points.

c) on the same axis sketch a system curve and label operating point.

Discuss the issues related to flight stability and the use of passive and active control?

a) Describe the specific energy.

b) In the rectangular duct, analyze the flow (Q) as a function of depth (y) for constant specific energy (E = E0).

c) Define critical depth (yc) and critical speed (Vc) for this case.

d) Plot the flow (Q) - depth (y) graph and show the regimes of the flow.

A chilled-water heat-exchange unit is designed to cool 5 m3/s of air at 100 kPa and 30°C to 100 kPa and 18°C by using water at 8°C. Determine (i) the maximum water outlet temperature and (ii) the total power consumed in KW-h, if the heat exchanger operated non-stop for 21 days. Assume the mass flow rate of the water is 2 kg/s.

Explain why bonding between carbon fibers and an epoxy matrix should be excellent, whereas bonding between silicon nitride fibers and a silicon carbide matrix should be poor? Q2- Explain briefly Ceramic-Matrix Composite?

For a given Induction Motor (IM),
1. Draw the equivalent circuit and label each parameter. Indicate which elements represent the
copper losses and mechanical output, respectively.
2. Sketch a typical torque versus speed curve of an IM. Indicate the starting torque,
synchronous speed, and maximum torque points.

Cold air at temperature of 10 C and velocity of 3 m/s is moving parallel to a flat plate with the length of 6 m and surface temperature of 75 C. A) Find the transition location on the plate and the heat loss from the plate. B) Repeat part (A) for water at the same velocity and temperature. The flat plate is made from copper.

1)The welding process with highest power density is: a) Electron beam welding. b) Plasma welding. c) Excimer laser welding. d) Shielded metal arc welding.

2) Welding 1015 and 1010 steels using CO2 laser: a) It is harder to weld the 1010 because of its low hardness. b) It is harder to weld the 1015 because of its low hardness. c) It is harder to weld the 1010 because of less prone for cracking. d) It is harder to weld the 1015 because of more prone for cracking.

3) Find the incorrect sentence from: a) Weldment melts and joins in fusion welding. b) Weldment melts and joins in solid state welding. c) Weldment melts and joins in brazing. d) Weldment melts and joins in friction welding.

4) When welding thin aluminum sheets with laser, the weldment should be: a) Positive b) Negative c) Either positive or negative d) None of the above

5) When using YAG laser to produce a lap joint of two steel sheets, the melt starts at: a) Top of the sheets. b) Between the sheets. c) Bottom of the sheets. d) None of the above.

6) In brazing, the base metals melt at temperatures above 840F (450C) while in soldering they melt at 840F (450C) or below a) true b) false

7) Which one of the following AW processes uses an electrode consisting of continuous consumable tubing containing flux and other ingredients in its core a) FCAW b) GMAW c) GTAW d) SMAW

8) Which one of the following arc welding processes uses a non-consumable electrode a) FCAW b) GMAW c) GTAW d) SMAW

9) "Stick" welding is a term sometimes applied when referring to a) FCAW b) GMAW c) GTAW d) SMAW

10) For metallurgical reasons, it is desirable to melt the weld metal with minimum energy input. Which one of the following heat sources is most consistent with this objective: a) high power b) high power density c) low power d) low power density