Engineering, 28.07.2020 03:01 calwhite216
[zero, extensive, boundary, volume, temperature, isobaric, adiabatic, isothermal, closed,
intensive, path dependent, cyclic, state, on]
1. The space separating the system from the surroundings is called the . 2. Temperature is kept constant in an process
3. In an isothermal process remains constant.
4. In an adiabatic process is not exchanged between the system and the
surroundings.
5. In process heat is not exchanged between the system and surroundings.
6. An property is independent of the amount of substance.
7. An property depends on the amount of substance.
8. A property is independent of the path
9. Change of internal energy is in a cyclic process
10. In an isochoric process is constant.
11. Pressure is constant in an process
12. Mass cannot be exchanged between the system and surroundings in a system
13. Work is a property
14. The change of a state property in a process must be zero.
15. The sign of work is positive when work is done the system.
Answers: 2
Engineering, 03.07.2019 15:10
Ahouse has the following electrical appliance usage (1) single 40w lamp used for 4 hours per day (2) single 60w fan used for 12 hours per day (3) single 200w refrigerator that runs 24 hours per day with compressor run 12 hours and off 12 hours find the solar power inverter size in watt with correction factor of 1.25.
Answers: 1
Engineering, 04.07.2019 18:10
Abrake has a normal braking torque of 2.8 kip in and heat-dissipating cast-iron surfaces whose mass is 40 lbm. suppose a load is brought to rest in 8.0 s from an initial angular speed of 1600 rev/min using the normal braking torque; estimate the temperature rise of the heat dissipating surfaces.
Answers: 3
Engineering, 04.07.2019 18:10
Aflywheel accelerates for 5 seconds at 2 rad/s2 from a speed of 20 rpm. determine the total number of revolutions of the flywheel during the period of its acceleration. a.5.65 b.8.43 c. 723 d.6.86
Answers: 2
Engineering, 04.07.2019 18:10
Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?
Answers: 1
[zero, extensive, boundary, volume, temperature, isobaric, adiabatic, isothermal, closed,
intensive...
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