Automotive Technology: A Systems Approach (MindTap Course List)

6th Edition

ISBN: 9781133612315

Author: Jack Erjavec, Rob Thompson

Publisher: Cengage Learning

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A vertical piston-cylinder assembly contains 0.5 kg of water. Initially, the piston is resting against the stops when the water pressure and temperature are 1.00 bar and 100°C, respectively. The piston has a mass of 50 kg and face area of 0.01 m2; local atmospheric pressure is 1.01 bar; local gravitational acceleration is 9.81 m/s2
(5) What water pressure would be required to lift the piston from the stops?
(3) Thinking about water as the system, is the system best described as open, closed, or isolated? Why?
(3) Are changes in kinetic and potential energy negligible for the system in this case? Why?
(5) How much heat transfer must occur to the water in order to begin to lift the piston from the stops?
(2) Once the piston is lifted from the stops, will the water pressure change? Why?
(5) Assuming that the water's pressure remains constant, find the work for the volume to double in kJ. Carefully indicate the direction (i.e., what is the work that you reported being done on or…

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A piston-cylinder assembly contains a mystery substance that undergoes a series of processes.
Process 1-->2: Constant pressure process at 5bar from v1=.07m3/kg to v2=.12m3/kg
Process 2-->3: Constant volume process to saturated vapor
Process 3-->4: Constant temperature process to quality of 50%
Process 4-->5: Constant volume process to 5bar
Sketch the processes on Pt, Pv, and Tv, plots. Lable the axes including property values; use closed dots to show the states, use solid lines to connect the states, add number and arrows to make clear the states numbers and process directions.
Could this be considered a thermodynamic cycle? Why or why not?

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Which of the following is intensive property heat:
work, internal energy, specific heat, heat capacity, pressure

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If a system is at steady state, does this mean intensive properties are uniform with position throughout the system or constant with time? Both uniform with position and constant with time? Explain.

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When you add heat to a system, by how much does its temperature change?

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Four kilogram of certain gas is contained within the piston- cylinder assembly. The gas undergoes a process for which the pressure-volume relationship is PV^1.5 = C. The initial pressure is 3 bars, the initial volume is 0.1 m^3 and the final volume is 0.2 m^3. The change in internal energy is – 4.6 ??/??. Determine the heat transfer for the process in KJ.

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Need help with this engineering problem.
Which unit could be used in the Ideal Gas law equation to get specific volume in ft3/lbm?
absolute pressure in lbf/ft2, Temperature in °R and the gas constant in ft·lbf/lbm·°R
absolute pressure in lbf/ft2, Temperature in °F and the gas constant in ft·lbf/lbm·°R
absolute pressure in lbf/ft2, Temperature in °R and the gas constant in ft·lbm/lbf·°R
barometric pressure in lbf/ft2, Temperature in °R and the gas constant in ft·lbf/lbm·°R
gauge pressure in lbf/ft2, Temperature in °F and the gas constant in ft·lbf/lbm·°R

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Carbon Dioxide is contained in a piston-cylinder assembly and undergoes a cycle made of the fol- lowing processes: • Process 1-2: Constant volume from 1 bar, 300 K to 600 K • Process 2–3: Polytropic expansion with n=k until P3 = P1 • Process 3-1: Isobaric compression (a) Sketch the cycle on p-v and T-v coordinates (b) Determine the work and heat transfer in each process, in kJ/kg (c) Determine the type of cycle that this is. If it is a power cycle, compute the thermal efficiency. Otherwise, compute the coefficient of performance for a heat pump cycle.

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As shown in the figure below, a gas contained in a vertical piston-cylinder assembly. A vertical shaft whose cross-sectional area is 0.8 cm2 is attached to the top of the piston. Determine the magnitude, F, of the force acting on the shaft, in N, required if the gas pressure is 3 Bar. The masses of the piston and attached shaft are 24.5 kg and 0.5 kg, respectively. The piston diameter is 10 cm. The local atmospheric pressure is 1 bar. The piston moves smoothly in the cylinder and g = 9.81 m/s2.

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Thermodynamics
A Piston-Cylinder system initially contains R-134a refrigerant at a temperature of 2.8 bar and 40 C, and its initial volume is 0.1 m3. First, heat is transferred to the system by keeping the piston constant and this process is continued until the pressure is 3.2 bar. the process is maintained by allowing the volume to change. At the end of this process, the temperature reaches 50C. Assuming the state changes as if balanced, calculate the following:
a)He amount of heat transferred during constant pressure operation
b)Show the state changes on the P-v diagram.

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Air is contained in a piston/cylinder device at an initial state where the volume is 1.7 m3, temperature is 250 K, and pressure is 454 kPa. In a portion of an engine cycle, air goes through the following two sequential processes:
Process 1-2: It is heated while the system is allowed to expand at constant pressure, until the volume increases by 55%.
Process 2-3: It is heated further to maintain a constant temperature while the volume increases by 55% again.
To simplify this problem, you can treat air as an ideal gas with constant specific heats.
a.) On your paper, draw these processes on a P-V diagram. Label states 1, 2, and 3.
b.) During these two combined processes, how much heat is transferred to the air, in kJ?

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A town has a 1.4-million-gallon storage capacity water tower. If the density of water is 62.4 lb/ft3 and local acceleration of gravity is 32.1 ft/s2, what is the force, in lbf, the structural base must provide to support the water in the tower?

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