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The pressure and temperature at the beginning of compression in an air-standard dual cycle are 14.0 lbf/in.2 and 5208R, respectively. The compression ratio is 15 and the heat addition per unit mass of air is 800 Btu/lb. At the end of the constant volume heat addition process, the pressure is 1200 lbf/in.2 Determine
(a) the net work of the cycle per unit mass of air, in Btu/lb.
(b) the heat rejection for the cycle per unit mass of air, in Btu/lb.
(c) the thermal efficiency.
(d) the cutoff ratio.
(e) To investigate the effects of varying compression ratio, plot each of the quantities calculated in parts (a) through
(d) for compression ratios ranging from 10 to 28.
As a pickup truck (total mass of 2500 kg, including fuel and driver) approaches a rise in an otherwise flat road, the driver presses the clutch and begins to coast. Initially the truck was moving at 34 m/s. For many reasons, including friction losses..
A single-row deep groove ball bearing operating at 1500 rpm is acted upon by a 2668 lb. radial load. The inner ring rotates, the load is steady and the service is continuous. Determine the rating life in hours if the basic load rating is 9210 lb.
The acceleration due to gravity at sea level is g = 9.81 m/s2 . What is the person"s weight at sea level? The acceleration due to gravity on the moon is g = 1.62 m/s2 . What would the person weigh on the moon?
Discuss the factors beyond crystal structure, quenching and temperature that affect he results of a specimen in a Charpy V notch impact testing.
a 200-mm-long strip of metal is stretched in two steps first to 300mm and then to 400mm. show that the total true
A power cycle receives 1120 Btu by heat transfer from a reservoir at 1080o F and discharges energy by heat transfer to a reservoir at 280 o F. The thermal efficiency of the cycle is 68% of that for a reversible power cycle operating between the same ..
Kinetic and potential energy effects can be ignored. Evaluate the work required and the heat transfer, each in kW.
A crane has a loading hook that is hanging in a steel wire. The allowable normal tensile stress in the wire gives an allowable force of 100,000 N. Estimate the safety factor that should be used.
what is the gauge pressure of the gas in this mercury manometer if h 81 mm and the atmospheric pressure is 773 mmhg?
a piston d50mm sits on top of a fluid s.g.11 connected to a 10mm diameter tube open to the atmosphere. a if the fluid
A heat pump with a COP of 3.0 is used to heat an air-tight house. When running, the heat pump consumes 5 kW of power. If the temperature in the house is 5 degrees C when the heat pump is turned on, how long will it take for the heat pump to raise the..
A rigid adiabatic container in a room with a barometric pressure of 100 kPa is divided into two unequal volumes as shown. V1 = 0.108 m3 and contains air (R = 0.2870 kJ/kg-K, k = 1.40) at a gauge pressure of 32 kPa and temperature of -3°C.
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