Engineering Answers

A company has decided to expand its business and has opened new departments. Company has its

software system, to incorporate those departments in existing software system, it contacts a software

company.

To build such a system which type of process model approach should be followed by the software

company, iterative, incremental, or simple linear approach. Justify your answer please.

In a slider crank mechanism, the length of crank OB and connecting rod AB are 125 mm and 500 mm respectively. The centre of gravity G of the connecting rod is 275 mm from the slider A. The crank speed is 600 r.p.m. clockwise. When the crank has turned 45° from the inner dead centre position, determine:

1. velocity of the slider A,

2. velocity of the point G, and

3. angular velocity of the connecting rod AB. Use relative velocity method.

[Ans. 6.45 m/s ; 6.75 m/s ; 10.8 rad/s]

The crank and connecting rod of a reciprocating engine are 200 mm and 700 mm respectively. The crank is rotating in clockwise direction at 120 rad/s. Find with the help of Klein’s construction: 1. Velocity and acceleration of the piston, 2. Velocity and acceleration of the midpoint of the connecting rod, and 3. Angular velocity and angular acceleration of the connecting rod, at the instant when the crank is at 30° to I.D.C. (inner dead center). [Ans. 15.24 m/s, 2880 m/s2 ; 16.8 m/s, 2779.2 m/s2 ; 29.66 rad/s, 1913.14 rad/s2]

In a slider crank mechanism having a stroke length of 30 cm and an obliquity ratio of 4, the crank is rotating uniformly in anti-clockwise direction. The angular velocity of crank is 52 rad/sec. The crank has turned through angle of 48.45 degree from IDC position. Determine using Klein’s construction:

a)   Acceleration of slider    [259.584 m/s2]

b)   Angular velocity and angular acceleration of connecting rod   [8.75rad/s, 500rad/s2]

c)    Velocity of slider    [6.812m/s]

The speed of a vehicle is reduced with a constant acceleration from 72km/h

72km/h to 18 km/h

km/h over 250m

250m directly down an incline of 1in25

1in25. The mass of the vehicle is 1.9 Mg

Mg and it has a constant resistance to motion of 350N

350N. 

Calculate the magnitude of the braking Force

a steam engine working on Rankine cycle operates between 1.96Mpa, 250degree celsius and 13.7Kpa. If engine consumes steam at the rate of 0.086kg per second, determine rankine cycle efficiency, neglecting pump work. Also, find Rankine cycle effeciency considering pump work.

A company purchased an equipment with the initial cost of 50000$. The annual operating cost of the equipment is 9000$ per year. There is a major maintenance cost of 20000$ at 6th year. The salvage value of the equipment is 6000$. Find the net present value if the useful life of the equipment is 9 years, considering interest rate is 10%/year. 

design and create the complete BOM list along with production plan for an office table of size 24"*48"*30" made of ms square pipe of 25mm*25mm*1.25mm and fitted with 18mm pre laminated mdf board with 3 drawers on left side of the table. 3 drawers were made of 0.8mm CRCA sheet in auto CAD software

1- In the casting of steel under certain mold conditions, the mold constant in Chvorinov's Rule is 

known to be 4.0 min/cm2

, based on previous experience. The casting is a plate (fig. 1) whose 

length l = 30 cm, width w = 10 cm, and thickness/height h = 20 mm. Determine the time it will 

take for the casting to solidify.

1. fluorine gas (F )

2. lithium fluoride (LiF)

3. glucose (C ) H O

B. Indicate the number of electrons lost or gained in forming theses ions:

1. Gold (III)

2. OH 

C. Give the name of each of the following compounds.

2 2 1.NO 2.NaF

3. CaBr

D. Given the name of the compound, write the molecular formula.

1.carbon monoxide

2.nitrogen trichloride