A rigid vessel initially contains saturated steam at P = 0.2 MPa. Heat is added until the pressure is 0.3 MPa. Determine the amount of heat added per kilogram of steam, and the change in specific entropy of the gas.
A. 3963 kJ/kg and 0.5751 kJ/kg•K
B. 277 kJ/kg and 0.5751 kJ/kg•K
C. 287 kJ/kg and 0.5971 kJ/kg•K
D. 14.1 kJ/kg and 0.5971 kJ/kg•K
E. Insufficient information to solve
A. Incorrect. This is a closed system so you cannot use enthalpy here.
B. Incorrect. Even though the specific volume at 0.3 MPa and 573.15 K is close, you still should interpolate to get the correct value. (Numerous online sites can be used to simplify the process.)
C. Correct. This problem is calculationally simple, but requires a good conceptual memory.
D. Incorrect. You cannot assume the steam is saturated at the end of the heating.
E. Incorrect. Enough data is present to provide a solution method.
You might also like to view...
Describe how pictorial assembly drawings are produced.
What will be an ideal response?
Active cruise control is being discussed. Technician A says active cruise control systems allow the driver to set the following distance of the vehicle ahead. Technician B says brakes can be applied and the throttle reduced anytime a slower vehicle is detected ahead by the system's radar. Who is correct?
A. A only B. B only C. Both A and B D. Neither A nor B
What is the information content if two-way diversity is used in a satellite system 10% of time by 50% of the traffic and the rest of the 50% traffic only 5% of time?
if (128, 32) code is used for error correction, what is the fraction of information contents?
Maps drawn showing the features that control property ownership are _______________ maps
Fill in the blank(s) with correct word