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One mole of argon (assumed to be an ideal gas) expands according to the relation
p=k V between its pressure and volume,k=constant . Find the entropy change of the gas when its volume doubles.
A steam engine working on Rankine cycle operates between 1.96 MPa, 250ºC and 13.7 kPa. If engine consumes steam at the rate of 0.086 kg per second, determine Rankine cycle efficiency, neglecting pump work. Also, find Rankine cycle efficiency considering pump work.
A reheat cycle operates between 80 bar and 0.075 bar. Temperature of steam entering turbine is 600ºCand first stage of expansion is carried out till the steam becomes dry saturated. Subsequently steam is reheated up to the initial temperature at inlet. Neglecting pump work determine efficiency and specific steam consumption in kg/hp·hr.
In an epicyclic gear train, as shown in Fig. 13.34, the wheel C is keyed to the shaft B and wheel F is
keyed to shaft A. The wheels D and E rotate together on a pin fixed to the arm G. The number of teeth
on wheels C, D, E and F are 35, 65, 32 and 68 respectively.
If the shaft A rotates at 60 r.p.m. and the shaft B rotates at 28 r.p.m. in the opposite direction, find
the speed and direction of rotation of arm G
A 2 cm diameter glass rod(k=0.8W/mk) is 6 cm long.I t has base temperature at 120°C and is exposed to the air at 20°C. The temperature at the tip of the rod is measured as 35°C. What is the convection heat transfer coefficient.H ow much heat is lost by the rod?
Describe your role and activities as Production
Planning and Control Engineer is various industries as:
• Food and beverage
• Retail sector
• Healthcare
• RMG Sector
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(a) (i) Test whether < 100. Take as level of significance a= 0:05.
(ii) Which assumption do you need?
(b) If the true value of u is 101, what type of error did you make in part (a)?
(c) (i) Determine a 90% confidence interval for u
(ii) Is it likely that u= 101?
A safety valve (pressure relieve valve) on top of a pressure vessel containing steam under pressure p = 2 MPa, has a discharge hole of diameter d = 10 mm as shown in the figure below. The valve is designed to release the steam when the pressure reaches the maximum allowable value pmax = 2.23 MPa. If the free height (i.e., uncompressed height) of the spring hfree = 135 mm and its spring stiffness k = 5 kN/m, what should be the dimension h of the valve?
A thin copper tube, 14 mm internal diameter and 0,5 mm wall thickness has closed ends and rotates at 1200 r/min while it is subjected to an internal gauge pressure of 222 Pa. Calculate the total hoop stress in the wall of the tube if the density of copper is 8900 kg/m3.
A shaft is transmitting power of 100 kw at 500 rpm and subjected to an additional bending
moment of 8 kNm. The shaft material has ultimate tensile stress of 450 MPa and ultimate
shear stress of 350 MPa. Calculate the diameter of the shaft. Take factor of safety as 5.
The crank of an engine is 180 mm long and obliquity ration is 4 determine acceleration of piston and acceleration of point x on the connecting rod located at 1/4 distance from big end when the crank is turned through 40° from the idc position and crank is rotating at speed of 300 rpm and is increasing at a rate of 120 rad/sec^2 use kilens construction
