Engineering, 22.02.2020 05:43 dragon2565
For each of the following cases choose a suitable system, if possible, and describe its boundaries and surroundings. Indicate if the work done (Wk) is positive, negative, or zero, and heat transfer (Q), if any, positive, negative or zero.
A balloon is inflated by means of a hand pump. Assume that the balloon, pump, and connectors are adiabatic.
A liquid moving inside a rigid vessel comes slowly to rest.
Hydrogen (H2) and oxygen (O2) in a rigid vessel undergo a chemical reaction and water is formed.
A pressure cooker containing water is put on a stove and the pressure inside rises.
An electric capacitor is connected to a battery.
The voltage across the capacitor is rising.
Answers: 3
Engineering, 04.07.2019 18:10
Acompressor receives the shaft work to decrease the pressure of the fluid. a)- true b)- false
Answers: 3
Engineering, 04.07.2019 18:20
Steam enters a converging nozzle at 3.0 mpa and 500°c with a at 1.8 mpa. for a nozzle exit area of 32 cm2, determine the exit velocity, mass flow rate, and exit mach number if the nozzle: negligible velocity, and it exits (a) is isentropic (b) has an efficiency of 94 percent
Answers: 2
Engineering, 04.07.2019 19:20
The process in which the system pressure remain constant is called a)-isobaric b)-isochoric c)-isolated d)-isothermal
Answers: 3
Engineering, 04.07.2019 19:20
Acompressor compresses a gas, a pump compresses a liquid. for a given pressure ratio, why does it take more work to compress a gas in a compressor than a liquid in a pump? a)- for a given pressure ratio the average specific volume for a gas is much higher than the average specific volume for a liquid. b)- there is no difference. the only difference is the amount of heat generated (not work) c)- for a given pressure ratio the average volurge for a gas is much higher than the average volume for a liquid. d)-there is no difference
Answers: 3
For each of the following cases choose a suitable system, if possible, and describe its boundaries a...
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