Mechanical Engineering Answers

The pressure of a gas in piston-cylinder varies with volume according to PV=C. The initial pressure is 350KPa and initial volume is 0.03 cubic meter, and the final volume is 0.07 cubic meter. Determine the work done in this expansion process. Express your answer in kiloJoules.

A particle moves on the path of 20 ft radius so that its arc distance from a fixed point on the path is given by s= 4³-10t where s is in feet and t in seconds. Compute the total acceleration at the end of 2 sec.

An automobile tire has a volume of 1000 cm³. It is inflated with carbon dioxide to pressure of 40 psig at 23°C.How many grams of carbon dioxide are contained in the tire?

An automobile tire has a volume of 1000 cm³. It is inflated with carbon dioxide to pressure of 40 psig at 23°C.How many grams of carbon dioxide are contained in the tire?

Assume 4.5 kg/sec of steam at 305°C, 1.5 Mpa expands isentropically in a turbine and exhaust at 138 kpaa, AP=0, AK-0. Sketch the process on the TS plane and find a) Exhaust temperature t₂, b) Work in Kw and KBTU/hr.

A rigid vessel contains 6 kg of wet steam at 0.4 MPa with a quality of 75% until the steam

has a temperature of 300C. Determine the initial internal energy and the final pressure.

n a slab milling operation the diameter of cutter is 50 mm and number of teeth of cutter is 12. If the 

cutter spindle speed is 300 rpm, depth of cut is 2 mm, length of job is 500 mm and table longitudinal 

feed is 200 m/min what will be the feed per tooth during the milling operation? If the cutter over travel 

is 2 mm what is the machining time for the single pass milling operation?

A mild steel square tank with a wall thickness of 8mm contains water at 80˚C. The thermal conductivity of amild steel is 50W/m.K and the heat transfer coefficients for the inside and outside of the tank are 2800W/m2.K, and 11W/k2.K respectively. Sketch and label the temperature profile and calculate the rate of heat loss per m2 of tank surface area when the atmospheric temperature is 25˚C.

A motor vehicle of mass 2000 kg travels round a curved path of radius 55 m the coefficient of friction between the tyres and the road surface is 0.75. The track of the vehicle is 1.5m and the centre of gravity is 70cm above ground level. Calculate the maximum speed at which the vehicle can travel round the curve:

i. without skidding outwards ii. without overturning

iii. if the angle of tilt is 300 without overtuming.

Discuss the bending moment theory with regard:

(A) A review to geometric properties

(B) Stress due to pure bending

(C) Shear formula derivation

(D) Stress due to shear