Hydrogen at 25^oC and 0.1 Mpa is fed to the head of a cutting torch. Calculate the adiabatic flame temperature if the hydrogen is burned with 250% excess air at at 25^oC and 0.1 Mpa,

a) without taking into account dissociation

b) assuming equilibrium composition of water has been achieved (both dissociation reactions of water reach chemical equilibrium)

Completely and thoroughly explain how Averages were determined and used by any company that either makes or installs any type of Heating or Air Conditioning Product

You may briefly summarize the concept, but at least 70% of your answer should be an explanation of how that concept is applied to the company specified in the question.

Consider an ideal Brayton cycle with reheat (air standard). The pressure and temperature of the air at the inlet of the gas turbine is 1200 kPa and 1000 K respectively. Assume the gas expands to 100 kPa in two stages. Between the stages, the air is reheated at a constant pressure of 350 kPa to 1000 K. Assume a fully isentropic process in the turbines.

Find:

(a) the work produced at each stage, in kJ/kg of air flowing.

(b) the heat transfer for the reheat process, in kJ/kg of air flowing.

(c) the increase in net work as compared to a single stage of expansion with no reheat.

Construct a vertical U-tube manometer to measure the pressure difference across a flow section. Explain in details and write an equation relating to the pressure difference to the difference in liquid level. Recommend TWO techniques to increase the sensitivity of a manometer. Justify your recommendation with the aid of diagrams and equations.

Heat & Mass Transfer

Consider the flow of water over a flat plate at a film temperature of 25 °C. The plate is 10m long, and the Reynolds number at the end of the plate is 10⁶.

Determine:

The free stream velocity

Is the flow laminar or turbulent at the end of the plate?

Is the flow laminar or turbulent at the mid-length?

What is the average Nusselt number?

What is the average heat transfer coefficient?

What is the Nusselt number at the end?

What is the heat transfer coefficient at mid-length?

What is the drag coefficient at mid-length?

C++ Primary U.S. interstate highways are numbered 1-99. Odd numbers (like the 5 or 95) go north/south, and evens (like the 10 or 90) go east/west. Auxiliary highways are numbered 100-999, and service the primary highway indicated by the rightmost two digits. Thus, the 405 services the 5, and the 290 services the 90.

Your program will prompt the user to type a highway number ("Please enter a highway number, Ex: 65: "), read in the number typed by the user, and print out whether it is a primary or auxiliary highway. If auxiliary, indicate what primary highway it serves.

Also your program must indicate if the (primary) highway runs north/south or east/west, that it is an invalid number if not between 0 and 999.

Superheated vapor enters the turbine at 10 MPa, 480°C, and the condenser pressure is 7.5 kPa of a steam Rankine power cycle. Isentropic efficiencies of the turbine and pump are 84% and 73%, respectively. Determine for the cycle

a. Sketch the cycle of a T-s diagram. Indicate the isobars with their values and the values for temperature and entropy.

b. The heat transfer to the working fluid passing through the steam generator, in kJ per kg of steam flowing.

c. The thermal efficiency.

d. Compute the entropy generated by the turbine per unit of mas of steam flowing.

e. The heat transfer from the working fluid passing through the condenser to the cooling water, in kJ per kg of steam flowing. [Hint: this refers to the cooling tower]

A pump steadily delivers 8.94 kg/s of water at the conditions given below. Calculate the pump power (hp).

The rate of heat transfer from the pump to the surroundings is Q = 1.61 kW.

There are no changes in kinetic or potential energy.

Pump Inlet Temperature = 50^oC

Pump Inlet Pressure = 1.75 MPa

Pump Exit Temperature = 50^oC

Pump Exit Pressure = 4.17 MPa

The circular fin of diameter D=1mm and length L=25.4mm, made of copper (k=400 W/m.K), are used to enhance heat transfer from a surface that is maintained at temperature Tb=132 °C. and the rod has another end attached to a large surface which is maintained at Te= 0°C. The airflow through the rod surfaces is at T∞ = 0 °C with convection heat transfer coefficient h = 100 W/m2.K. (Hint: use table 3.4 in the lecture slides.)

(a) Express temperature T(x) along the fin and calculate the temperature at x=L/2. (5points)

(b) Determine the rate of heat transfer at the hot end of the fin (3 points) and calculate the fin effectiveness (2 points).

How to find the material kind from the young modulus? My young modulus is 21548.26 MPa. I dont know what table to look at.

discuss how analog signal is converted to a digital signal in an analog to digital (A/D) converter(ADC).you may use sketches to support your answer

Identify the risk factors associated with worker, job and workplace environment in the following industry and give recommendations for reducing the risk. (Mining industry)

(please don't write the answer in a paper)

a)(10%) What is the distinction between hypoeutectoid and hypereutectoid steels? b)(10%) For a 99.65 wt% Fe – 0.35 wt% C alloy at a temperature just below the eutectoid, determine the following: i.The fractions of total ferrite and cementite phases. ii.The fractions of the proeutectoid ferrite and pearlite. Sketch the microstructure. iii.The fraction of eutectoid ferrite.

How to design C-clamp