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A two stage single acting air compressor with complete intercooling takes in air at 1 bar and 288k at rate of 360kg/h.The delivery pressure is 16 bar. Calculate the power required,the isothermal efficiency ,FAD and the net heat transferred in each cylinder and the intercooler . Take the index of compression and expansion for both stages is 1.3. The speed of the compressor is 420rpm. If the clearance ratios for the LP and HP cylinders are 0.06 and 0.08 respectively , calculate the swept and clearance volumes for each cylinder.
A three-stage, single acting compressor is required to compress 135m3 of free air per hour from 1bar to 64bar. Prove that with complete intercooling the stage pressure ratio should be equal to the cube root of the overall pressure ratio for the required power to a minimum. Calculate the power needed in each case, assuming n = 1.3.
If the mean piston speed is to be 140 m/min, calculate the piston areas, neglecting clearance. State any assumptions made.
A gas – turbine plant operates on the ideal cycle. The air enters the compressor at 1 bar, 15°C, and is delivered at 6 bar; the temperature at turbine inlet is 650°C. Determine per kg of air.
a) the compressor work
b) the turbine work
c) the heat supplied
d) the heat rejected
e) the thermal efficiency of the plant
Assume the working fluid to have the properties of air throughout, and take cp = 1.005 kJ/kg K and γ = 1.4.
In a gas turbine unit air is drawn in at 1.02 bar and 15°C, and is compressed to 6.12 bar. Calculate the thermal efficiency and the work ratio of the ideal constant pressure cycle, when the maximum cycle temperature is 800°C.
Determine the root mean square velocity of nitrogen at a
temperature of 300 K.
Evaluate
"\\int\\int_D(3-x-y)dA"
[dA means dxdy or dydx]
where D is the triangle in the (x, y) plane bounded by the x-axis and the lines y = x
and x = 1.
Optical fibres typically use lasers as the light source. They normally transmit digital data in a series of ones and zeros. Explain how this data is used to represent a digital number between 0 and 7 and how the laser transmits this data and how it is received
