Helium in a piston/cylinder at 20 C, 100 kPa is brought to 400 K in a reversible polytropic process with exponent n = 1.25. Helium can be assumed to be an ideal gas with constant specific heat. Find the specific work.

Helium in a piston/cylinder at 20 C, 100 kPa is brought to 400 K in a

1.	Helium in a piston/cylinder at 20 C, 100 kPa is brought to 400 K in a reversible polytropic process with exponent n = 1.25. Helium can be assumed to be an ideal gas with constant specific heat. Find the specific work.
A.	-587.7 kJ/kg
B.	-687.7 kJ/kg
C.	-787.7 kJ/kg
D.	-887.7 kJ/kg
Answer» E.

Discussion

No Comment Found

Related MCQs

A piston/cylinder contains air at 100 kPa, 300 K. A reversible polytropic process with n = 1.3 brings the air to 500 K. Any heat transfer if it comes in is from a 325 C reservoir and if it goes out it is to the ambient at 300 K. Find the specific work.
A mass of 2 kg ethane gas at 100 C, 500 kPa, undergoes a reversible polytropic expansion with n = 1.3, to a final temperature of 20 C. Find the work done.
A cylinder/piston contains 100L of air at 25 C, 110 kPa. The air is compressed in a reversible polytropic process to a final state of 200 C, 800 kPa. Assume the heat transfer is with the ambient at 25 C. Find the work done by the air.
A cylinder/piston contains carbon dioxide at 300 C, 1 MPa with a volume of 200L. The total external force acting on the piston is proportional to V3. This system is allowed to cool to room temperature, 20 C. Find the work.
Consider air in a cylinder volume of 0.2 L at 7 MPa, 1800K. It now expands in a reversible polytropic process with exponent, n = 1.5, through a volume ratio of 8:1. Calculate the work for the process.
Helium in a piston/cylinder at 20 C, 100 kPa is brought to 400 K in a reversible polytropic process with exponent n = 1.25. Helium can be assumed to be an ideal gas with constant specific heat. Find the specific work.
A cylinder/piston contains 1kg methane gas at 100 kPa, 20 C. The gas is compressed reversibly to a pressure of 800 kPa. Calculate the work required if the process is polytropic, with exponent n = 1.15.
A cylinder/piston contains 1kg methane gas at 100 kPa, 20 C. The gas is compressed reversibly to a pressure of 800 kPa. Calculate the work required if the process is isothermal.
Neon at 400 kPa, 20 C is brought to 100 C in a polytropic process with n = 1.4. Find the work done.
The piston/cylinder contains carbon dioxide at 300 kPa, with volume of 0.2 m3 and at 100 C. Mass is added at such that the gas compresses with PV^(1.2) = constant to a final temperature of 200 C. Determine the work done during the process.

Helium in a piston/cylinder at 20 C, 100 kPa is brought to 400 K in a reversible polytropic process with exponent n = 1.25. Helium can be assumed to be an ideal gas with constant specific heat. Find the specific work.

Discussion

No Comment Found

Related MCQs

Reply to Comment