answer the following questions about this system: 1- In order to find the proper

Question

answer the following questions about this system:

1- In order to find the properties at state 4, what component is analyzed?

A Turbine

B Steam Generator

C None of the above

2- What is the highest temperature possible at state 4 if the mass flow rate in at state 3 was lowered?

A 260 F

B 400 F

C No upper limit

3- If the initial quality in example 4.11 was 0.6 (rather than 0.7), the amount of heat transfer calculated in the problem would

A decrease

B increase

4- The enthalpy exiting the value in Figure E4.12 compared to the enthalpy entering the valve is

A smaller

B the same

C larger

Explanation / Answer

1- In order to find the properties at state 4, what component is analyzed?

Ans- B) Steam Generator... the state 4 is determined by energy balance equation at the heat exchanger(steam generator)

2- What is the highest temperature possible at state 4 if the mass flow rate in at state 3 was lowered?

Ans - C) No upper limit...As mass flow rate of water decreases, the specific enthalpy change increases to have constant energy change(Ein = Eout) in the steam generator.

Eout = Mw(h4 - h3) if Mw decreases, (h4 - h3) will increase and h3 is constant so h4increases which is result of temperature increase at constant pressure of 40 psia.

3) please upload example 4.11

4) Please give figure E4.12

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