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

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects