An aluminum plate with a thickness of 2L=0.22m is initially at a temperature of To=250°C. The plate is suddenly brought into contact with a fluid at a temperature of T∞=50°C, where the convection heat transfer coefficient is h=500 W/ m2K. Determine

a. the mid-plane temperature at t=300 seconds.

b. the total heat transfer from the plate to the fluid in 300 seconds if the surface area of one side of the plate is 1 m2 .

3. What is the just-in-time (JIT) manufacturing? How to achieve it? How does it impact facilities design? (15 pts)

In the planetary gear train shown in Figure Q2, the annulus A rotates at 300 rpm about the axis of fixed wheel S which has 80 teeth. The armed spider (arm) is driven at 180 rpm. The annulus is connected to input shaft whereas the arm is connected to the output shaft. If the efficiency of gear system is 98% and input torque is 100 Nm, identify the following information regarding these problems (i) The number of teeth on planet gear, P (ii) Holding torque for fixed wheel (iii) Power transmitted by the gear train.

The indoor temperature of an oven can go up to 250 degrees Celsius. There is a 2 mm thick sheet metal material inside and outside of the oven wall. There is a 10 mm insulation material between the oven wall. It is desirable that this temperature should not exceed 30 degrees Celsius in order not to damage the outside of the oven by hand. Find the amount of heat (W) discharged from the furnace unit area and unit time and the energy consumed if the furnace operates for 2 hours.
k_Insulation = 0.0.35 W / m.K
k_sheet metal = 40 W / m.K
h = 25 W / m ^ 2.K

Sketch and label the following thermodynamic processes on enthalpy-temperature or internal energy-temperature diagrams (as appropriate). Use a separate diagram for each case. Clearly label reactant and product conditions on each diagram as well as the direction of the process path. For each process, specify (a) what initial conditions/inputs must be provided, (b) what resulting reaction quantity of interest can be calculated, (c) what thermodynamic constraints/assumptions apply, and (d) why you chose each diagram as well as why you drew each process path.

CASE 1: reaction occurring within a bomb calorimeter

CASE 2: reaction occurring in a highly conductive, non-insulated piston/cylinder

CASE 3: reaction associated with ideal combustion event in an Otto engine

CASE 4: reaction associated with ideal combustion event in a Diesel engine

Q/A coal sample has 90% carbon, 3.3% hydrogen, 3% oxygen, 0.8% nitrogen. 0.9% sulphur and 2% ash. For 50% excess air supply determine percentage composition of dry flue gases by volume and minimum oxygen required.

A 3-kg mass is attached to the end of a coil spring with stiffness k=48N/m . The mass is then pulled down 0.5m (from its equilibrium position) and released at t = 0 with an initial velocity of 2 m/sec directed upward. Neglect the resistance of the medium. a) Determine the resulting displacement and velocity as functions of time. b) Find amplitude, period and frequency of the motion. c) At what time does the weight first pass through the equilibrium position?

Water (cp=4179 J/kg·K) at 30 °C flows on the inside of a steel tube with 25 mm inner diameter and 0.4 mm wall thickness at a flow rate of 0.4 kg/s. The tubes forms inside of a counter flow double pipe heat exchanger. Engine oil at 100 °C flows in the annular space with a flowrate of 0.1 kg/s. The outlet temperature of the oil is 60 °C. The material of the heat exchanger is carbon steel with k=45 W/m·K. The inner diameter of the outer tube is 55 mm. If the length of a hairpin is 5m, calculate the number of hairpins ignoring the fouling resistances.

please can you help me course name heat exchangers.

Air enters the compressor of an ideal cold air-standard Brayton cycle at 100 kPa, 300 K, with a mass flow rate of 6 kg/s. The compressor pressure ratio is 10, and the turbine inlet temperature is 1400 K.


For k = 1.4 and C_p = 1.005 kJ/kg, calculate:

(a) the percent thermal efficiency of the cycle.

(b) the back work ratio.

(c) the net power developed, in kW

What fluid property is responsible for the develop­ment of the velocity boundary layer? Explain in detail.

A rectangular car tank 20m long, 4m wide and 3m deep is completely open at the top. If it is initially filled to the top: (a) How much liquid will be spilled if it is given a horizontal acceleration of 0.3g in the direction of its length? (b) What is the maximum hydrostatic force acting on the side opposite the direction of the acceleration. (c) Determine the volume of the remaining water at the tank.

nterpret the following NC program block by block. Indicate G and M functions for each block, describe the tool movement and its path also.

N010 G90 G70 M03 S1200 T05

N020 G00 X0.375 Y0.875

N030 Z0.1

N040 G01 Z-0.1 F10.0 M08

N050 X2.0 F20.0

N060 G02 X2.375 Y0.5 I0.0 J-0.375

N070 G01 Y0.375

N080 X3.625

N090 Y1.25

N100 X3.5

N110 G02 Y1.875 I0.0 J0.375

N120 G01 X3.625

N130 Y2.625

N140 X2.375

Explain the finite element method for stress analysis as you would to a high school student who is interested in becoming an engineer. Note that this could be the deciding factor for the student to choose Engineering at University. As such keep your answer relevant, interesting and succinct (furthermore, the student is young so they get bored easily...).

[Word limit: 200]

Infrared Soldering

(FOR REPORT PURPOSE)

1. Synopsis
2. Introduction (Applications/Industries)  
3. Mechanism and Metallurgy