Mechanical Engineering Answers

a horizontal gas engine running at 210 rpm has a bore of 220mm and stroke of 440mm. The connecting rod is 924mm long the reciprocating parts weighs 20kg when the crank has turned to the angle of 30° from IDC . The Gas pressure and the cover and the crank sights are 500KN/m2 and 60KN/m2 respectively .Diameter of the piston rod is 40mm

i) Turning moment on the crank shaft

ii) Thrust on Bearing

iii) Acceleration of the flywheel which has a mass of 8kg and radius of gyration of 600mm while the power of the engine 22kw

A pressure cooker has 1.0 kg of steam 0.8 dry at 3.0 bar. What amount of heat needs to be supplied

to raise its pressure to 4.0 bar?

A study of the compressibility charts, Items B 19 through B 21, will reveal that certain combinations of PR and TR will produce compressibility factors of Z = 1, as if the gas were ideal. (a) List several of these combinations from Item B 20. (b) What will be the state (p psia, t°F) of a given fluid (other than ideal) to produce Z = 1 if that fluid is air? Ammonia? Helium?

A booster station compresses 50 kg/sec of methane from 14 atm, 285 K to 92 atm in a reversible and isothermal steady state steady-flow manner. Use the general ized fugacity coefficient chart (Item B 37) and calculate the compression work and the heat transfer. Now solve using ideal gas theory and compare answers.

piston-cylinder contains gas initially at 3500 kPaa with a volume of 0.03 mº. The gas is compressed during a process where pV 1.25 C to a pressure of 8500 kPaa. The heat transfer from the gas is 2.5 kJ. Determine the change in internal energy, neglecting changes in kinetic and potential energies.

In a crank and slotted lever quick return mechanism, as shown in Fig. 5.37, the driving crank length is 75 mm. The distance between the fixed centres is 200 mm and the length of the slotted lever is 500 mm. Find the ratio of the times taken on the cutting and idle strokes. Determine the effective stroke also. [Ans. 1.67 ; 380 mm] 3.

An electron has a rest mass of 9.11×10^(-28) g. What is its mass in kg when moving with a speed of 0.95c_0? Express the answer in 4 significant figures

Figure 3 shows a loaded bracket supported by nut and bolt at O. Given force a= 25.3 kN and force b= 97.6 kN. Assume moment in counter clockwise direction as positive sense.

Figure below shows a composite shape on a positive x-y coordinate system (solve the question by using the given x-y coordinate system).

Given a=128 mm.

Determine the total area of the composite shape (answer in mm², with single decimal place).

A single cylinder two stroke diesel engine of 125mm bure and 152 mm stroke with Comprenion ratio r = 15 at 1800 rpm. is ronning • arbea, Actos / -Air flow / hour = 245 kg;

Air Inlet tempertun = 300°K; Exhaust pression = 1.0275 bal

Determine (1) The Sav • Scavenging ratio

(ii) The Scavenging efficiency 1111/ Trapping Efficiency.