Engineering Answers

A reaction between methanol and oxygen can be used to produce formaldehyde: 2𝐶𝐻3𝑂𝐻 + 𝑂2 (𝑔) → 2𝐻𝐶𝐻𝑂(𝑔) + 2𝐻2𝑂(𝑙): ∆𝐻̂𝑟 𝑜 = −326.2 𝑘𝐽/𝑚𝑜𝑙 The standard heat of combustion of hydrogen is: 𝐻2 (𝑔) + 1 2 𝑂2 (𝑔) → 𝐻2𝑂(𝑙): ∆𝐻̂𝑟 𝑜 = −285.8 𝑘𝐽/𝑚𝑜𝑙 (a) Use these heats of reaction and Hess’s law to determine the standard heat of the direct decomposition of methanol to form formaldehyde: 𝐶𝐻3𝑂𝐻(𝑙) → 𝐻𝐶𝐻𝑂(𝑔) + 𝐻2(𝑔)

Q2/ The Quality Factor of a certain fiber optic communication system is three, find the value of BER in two methods. (By equation and by graph).

10 ^ 0

10 ^ - 3

Q = 5.99781 for P_{o} = 10 ^ - 9

0

8

10 ^ - 15

10 ^ - 12

10 ^ - 9

P .

10 ^ - 6

Q3/ Analogue optical fiber communications link have OSNR = 10 dBm and the signal

to noise ratio (SNR) = -200dBm. What is the indication about this system? Suggest a

solution about this problem.

9.

Question 9

Use this information to answer Question 9-12:

Consider a step pn junction made of silicon. The doping densities in the p- and n-sides are N_A ​=5×1015 cm^−3 and N_D =1×1014 cm^−3 , respectively.

Find the built-in potential in unit of V

Answers within 5% error will be considered correct.

10.

Question 10

Determine the depletion region width, x_n ​, in the n-side in unit of μm.

Answers within 5% error will be considered correct.

11.

Question 11

Determine the depletion region width, x_p ​, in the p-side in unit of μm.

Answers within 5% error will be considered correct.

12.

Question 12

What is the applied bias voltage (in V) required to have x_n =30μm.

Answers within 5% error will be considered correct.

Starting from rest, you run the engines at full power and holding a straight line, you observe that the ship accelerates uniformly from 0 m/s to 10 m/s over 2.25 km. The mass of the ship fully loaded is 42500 tonnes and the average water resistance is known to be 6.5 MN. The ships engines (4 x 16 cylinder engines with a total 4500 l) are rated at 46080 kW.

a. Determine the total work done during the test.

b. Calculate the amount of power the engines delivered throughout the test. Are they delivering the rated power?

c. Prepare a Sankey diagram to explain the energy flow from chemical energy in the diesel fuel through to the kinetic energy of the liner indicating any losses.

Any help would be greatly appreciated. Thank you.

The person’s data provided in the text file contains the following information: First Name (string), Last Name (string), Telephone (string), email (string). The program should read the data file at the start containing Persons data, store the data in the BST (binary search tree) and then present the following menu: Find and show person’s data given its email. Append new Person entered by user. Delete the data of a Person given its email. Show the data of all Persons. Exit Upon exit, overwrite the provided text file with the current data of the link list, so that the text file has the updated data

4.

Question 4

Use this information to answer Question 4-8:

Consider a step pn junction made of GaAs at T = 300 K. At zero bias, only 20% of the total depletion region width is in the p-side. The built-in potential ϕi =1.20V.

Determine the acceptor density in the p-side in unit of cm^-3.

Answers within 5% error will be considered correct.

5.

Question 5

Determine the donor density in the n-side in unit of cm^-3

Answers within 5% error will be considered correct.

6.

Question 6

Determine the depletion region width, x_n​, in the n-side in unit of μm.

Answers within 5% error will be considered correct.

7.

Question 7

Determine the depletion region width, x_p​, in the p-side in unit of μm.

Answers within 5% error will be considered correct.

8.

Question 8

Determine maximum electric field in unit of V/cm

Answers within 5% error will be considered correct.

1.

Question 1

Use this information to answer Question 1-3:

Consider a step pn junction made of silicon. The p- and n-sides are doped such that E_C - E_F = 0.21 eV on the n-side and E_F - E_V ​=0.18eV on the p-side. The pn junction is under zero bias and kept at T=300K.

Find the doping density in the n-side in unit of cm^-3

.

Answers within 5% error will be considered correct.

2.

Question 2

Find the doping density in the p-side in unit of cm^-3

.

Answers within 5% error will be considered correct.

3.

Question 3

Find the built-in potential in unit of V

Answers within 5% error will be considered correct.

Tank A which is at a pressure of 1200 kPa, supplies 400 L/min of medium fuel oil to operate a hydraulic press via a 1” schedule 40 steel pipe. The medium fuel oil then exits the hydraulic press and returns to the pressurized tank A via a pump through 2” schedule 40 steel pipes. The pump is rated at 10 hp and has an efficiency of 90%. If the following data are known:

·        Energy loss from tank A to the hydraulic press inlet is 5.4 Nm/N.

·        Energy loss from hydraulic press outlet to the pump inlet is 0.8 Nm/N.

·        Energy loss from outlet of pump to tank A inlet is 1.8 Nm/N.

Ignoring all other losses, compute the following:

1.        Pressure at the hydraulic press inlet.

2.        Pressure at the pump outlet.

3.        Pressure at the pump inlet.

4.        Pressure at the hydraulic press outlet.

5.        Power removed from the fluid by the hydraulic press

Discussion about verification and interpretation of truth tables for digital logic gates.