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1. 1 kg of air is polytropically compressed reversibly from 5 bar to 10 bar from an initial temperature of 300°C. Find the transferred heat and the change in entropy. Take the polytropic index as 1.25.
2. 0.5 kg of dry air is expanded reversibly to a final temperature of 100 °C. The work done by the system is 1000kJ. Determine the change in entropy of the system. Take the polytropic index as 1.2.
3. Determine the change in entropy for 1.0 mole of an ideal gas originally confined to one-half of a 5.0-L container when the gas is allowed to expand to fill the entire container at constant temperature.
tests reveal that a normal driver takes about 0.75 seconds before he or she can react to a situation to avoid a
In order to increase production rate, a reactor setpoint was increased from 160 psig to 190 psig. The reactor pressure transmitter was recalibrated from 0- 200 psig to 0- 300 psig. What is the percent span for the old and new setpoints?
Many ventilation systems maintain a slightly higher pressure in a building than the outside pressure. If the pressure in your room is 0.1 psi than the outside pressure will you be able to open the door? How much is this force compared to your weight?..
Four kilograms of water initially at 200 degree Celsius and 0.5 MPa undergo an isothermal, internally reversible compression process to the saturated liquid state. Determine the work and heat transfer involved in the process (in kJ). Sketch the proce..
a 20 mw radial flow hydraulic turbine is to be designed with a head of 70 m and a speed of 90 rpm. a geometrically
a piston-cylinder device contains 0.15kg of air initially at 2mpa and 350oc. the air is first expanded isothermally to
An ideal gas is confined to one side of a rigid, insulated container divided into equal volumes by a partition. The other side is initially evacuated. The following data are known for initial state of the gas: p1 = 300 kPa, T1 = 380K and V1 = 0.025 m..
Air enters a control volume at a pressure of 19000lbf/ft^2, a velocity of 80ft/s and a temp of 440 degrees F. the area through which the air flows is .05 ft^2. The air behaves as an ideal gas. Determine the mass flow rate in lb/s.
a 230-v shunt motor develops a torque of 40 ib-ft when the armature current is 11 a. find the torque developed when the
10 kg of air in a piston-cylinder initially at 0.5 Mpa, 227 Celsius, undergoes two processes in series. constant temperature expansion to triple the volume. constant volume heating to the initial p = 0.5 MPa.
suppose that 1 kg of saturated water vapor at 100ordmc is condensed to a saturated liquid at 100ordmc in a
Consider a 1.25 cm diameter carbon steel (1% C, k = 40 W/m-K) sphere to be cooled from 500oC to 100oC by a cooling air flow at 25oC with convection coefficient of 110 W/m2-K.
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