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Sample Topics

### Thermodynamics

Thermodynamics is an applied science used by many subdivisions  of engineering, including engineering. It is the study of energy and transformation and usage through a system. Generally, thermodynamics is Related with changing energy from one form to another.
Sample Questions:

1. A gas is initially contained inside an insulated container A, at initial conditions P1, V1, m, and T1. These quantities represent pressure, volume, mass, and temperature, respectively. A valve is then opened which allows the gas to expand freely into an insulated container B, which is initially empty. After the gas has settled, the final conditions of the gas are P2, V2, m, and T2. In thermodynamics, a process is said to be reversible if it produces no entropy. This means that the process can happen in the reverse direction. Explain why the process described is not reversible.

2. A vortex tube, also known as a Ranque-Hilsch vortex tube, is a mechanical device without moving parts that separates a compressed gas into hot and cold streams. According to a manufacturer’s specifications, pressurized air enters a vortex tube at a temperature of 20°C and a guage pressure of 700 kPa. Cold air exits the left side of the tube at a temperature of -18°C and at atmospheric pressure. Hot air exits the right side of the tube at a temperature of 105°C and at atmospheric pressure. The ratio of mass flow rate between the cold stream and the inlet stream is 0.70. Are these specifications possible?

3. Steam at a temperature of 350°C and a pressure of 1 MPa is flowing through a pipe. What is the enthalpy of the steam?

### Fluid Mechanics

Fluid Mechanics is the study which deals with the behaviour of liquids with respect to mechanics in motion or at rest i.e. Different reaction of fluids with different forces.
Sample Questions:

1. Find the pressure inside a water droplet having diameter of 0.5 mm at 20 0 C if the outside pressure is 1.03N/cm 2and the surface tension of water at that temperature is 0.0736 N/m.

2. A balloon is filled with hot air of 60°C. Its diameter is 10 m. The environmental temperature is 0°C. Pressure outside and inside the balloon is 105 Pa. The weight of the balloon material is can be neglected. Determine the buoyant force!

3. Calculate the horizontal force acting on the conical part of the pipe! q 3.5 m / min 3 V = Friction losses are negligible.

### Machine Design

Machine Design or a Technical drawing also known as drafting is an illustration creating steps for manufacturing parts. Drafting has historically been a two-dimensional process, but computer-aided design (CAD) programs now allow the designer to create in three dimensions.
Sample Questions:

1. A helical compression spring must give a minimum force of 500 N and a maximum force of 750 N over an adjustment range of 2 cm static deflection. The spring material is A227 cold drawn wire; the loading is static. Design the spring. (G=79.6 Gpa)

2. The steel pipe shown in the figure has an inner diameter of 2 cm and outer diameter of 2.15 cm. If it is subjected to the force F = 80j + 40 k (N), determine the principal stresses in the pipe at point A and B which are located on the surface of the pipe.

3. A single square-thread power screw has an input power of 3 kW at a speed of 1 rev/s. The screw has a major diameter of 36 mm and a pitch of 6 mm. The frictional coefficients are 0.14 for the threads and 0.09 for the collar, with a collar friction radius of 45 mm.

a) Find the axial resisting load F and the combined efficiency of the screw and collar.

b) Indicate whether the screw is self-locking or not.

c) Find the most critical section and determine safety factor assuming that the load is static. Nut and power screw are made of AISI 1040 HR steel. (Do not consider buckling)

### MATLAB

MATLAB also know as Matrix Laboratory is programming language developed by Maths Work. Its key use is numerical computing and Matrix Manipulation. It includes Functions, Structures, variables and vectors.
Sample Questions:

1. How could we write a function strpoint that returns a string (x,y) containing the x- and y-coordinates? For example, it might be called separately to create strings for the two endpoints and then printed as shown here: >>

fprintf(‘The line segment consists of %s and %sn’, …

strpoint(lineseg.endpoint1), …

strpoint(lineseg.endpoint2))

The line segment consists of (2, 4) and (1, 6)

2. Create three cell array variables that store people’s names, verbs, and nouns. For example, names = {‘Harry’, ‘Xavier’, ‘Sue’}; verbs = {‘loves’, ‘eats’}; nouns = {‘baseballs’, ‘rocks’, ‘sushi’};

3. The velocity of sound in air is 49.02 T feet per second where T is the air temperature in degrees Rankine. Write a function to implement this. If just one argument is passed to the function, it is assumed to be the air temperature in degrees Rankine. If, however, two arguments are passed, the two arguments would be first an air temperature and then a character ‘f’ for Fahrenheit or ‘c’ for Celsius (so this would then have to be converted to Rankine). Note: degrees R = degrees F + 459.67. Degrees F = 9/5 degrees C + 32

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