\"Thermodynamics\" Please solve the whole MC questions. 1. Multiple choices ques
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"Thermodynamics"Please solve the whole MC questions. 1. Multiple choices questions (20 points (A) The mass within the control volume always remains constant. (B) The energy within the control volume always remains constant (C)The fluid properties may change with location over the cross section of inlets or exits. (D)The fluid properties do not change for different locations (E) None of the above. (A). It is the energy needed to push a fluid into or out ofa control volume. (B). It is included in the energy of a nonflowing fluid such as that contained in a closed system. (C). It is a state property, which is not affected by the path of a process (E). It is equal to v (ic (2p) The energy balance equation can be applied to: (A) A closed system. (B) A control volume under steady operation. (C) A control volume system under transient operation. (D)Any system under any specific operating conditions. (E) All of the above. (A) W 0 (B) Ake 0 (C) 0 (D) Ape 40. (E) None of the above (A) APE 0. (B) W (C) inlet houtlet. (D) u uoutlet inlet (E) All of the above. (A) Diffusers. (B) Nozzles. (C) Steam turbines. (D) Throttling valves (E) Mixing chambers.
Explanation / Answer
Answers
1a) D In steady flow divice mass and time within the control volume is aways cnstant
1b) A Flow work needed to push the fluid in to and out of the boundries of control volume if mass is invoved
1c) E For a closed system, there is no material exchange between our system and surroundings. Only energy exchange happens. total mass
total mass entering CV – leaving CV = net change in mass within CV
1d) B simplified expression for nozzles and diffusers:
q + (hin +o.5c2in) – (hout+o.5c2out) =0
q + (hin –hout) + 0.5 (c2in – c2out) =0
where
1e) C
1f)C & D
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