Question

A storage tank contains liquid water at 50oC and is vented to atmosphere at the top (where atmospheric pressure = 101.3 kPa). The distance from the bottom of the tank to the liquid surface level is 1.55 m. What will be the absolute pressure at the bottom of the tank?

(A) 12.35 kPa (B) 116.3 kPa (C) 201.3 kPa (D) 113.65 kPa

The pressure of an ideal gas drops significantly as it flows under steady state conditions through an insulated throttle valve. Which of the following does not remain constant: (A) Temperature? (B) Specific entropy? (C) Specific internal energy? (D) Specific enthalpy?

Condensing of a refrigerant in the ideal vapour compression refrigeration cycle occurs at constant (A) Temperature (B) Pressure (C) Specific enthalpy (D) Specific entropy

Answer #1

A rigid tank has a volume of 0.01 m3. It
initially contains saturated water at a temperature of 200
oC and a quality of 0.4. The top of the
tank contains a pressure regulating valve which maintains the vapor
at constant pressure. This system undergoes a process where it is
heated until all the liquid vaporizes. How much heat in (kJ) is
required? You may assume there is no pressure drop in the exit
line.

A tank having a volume of 0.85 m^3 initially contains water as a
two-phase liquid vapor mixture at 260 C and a quality of 0.7.
Saturated water vapor at 260 C is slowly withdrawn through a
pressure-regulating valve at the top of the tank as energy is
transferred by heat to maintain the pressure constant in the tank.
This continues until the tank is filled with saturated vapor at 260
C. Determine the amount of heat transfer in kJ. Neglect...

Reconsider the top-secret military power supply for artic
environments that you worked in a previous homework. Previously,
you modeled it as a Carnot cycle; now you will use the more
realistic Rankine cycle. The boiler operates at 1000 kPa with a
maximum temperature of 30°C. The condenser is isobaric and operates
at -5°C. a. Calculate the vapor quality leaving the turbine and the
specific enthalpy exiting the turbine (in kJ/kg) b. Determine the
specific-work produced by the Rankine cycle turbine...

1 kg of water in a piston cylinder arrangement is initially in a
saturated liquid state at 1 bar. It undergoes expansion at constant
pressure due to external heat supply to it, to a final state of
saturated vapor.
(i) What is the initial temperature of water in C? (a) 93.50 (b)
96.71 (c) 99.63 (d) 111.4 (e) 12.2
(ii) What is the change in enthalpy of water (kJ/kg-K)? (a)
417.46 (b) 2258.0 (c) 2675.5 (d) 2506.1
(iii) What is...

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