Part A: Choose the best answer for each multiple choice question below. (1) (2 p

Question

Part A: Choose the best answer for each multiple choice question below. (1) (2 pt) Thermodynamics cycles can be categorized as gas cycle and vapor cycle, depending on the phase of the working fluid. What is the difference between these two categories? (a) In vapor cycle, the working fuid is gas only. (b) In vapor cycle, the phase of working fluid changes between vapor and liquid in different parts of the cycle. (c) In gas cycle, the phase of working fluid changes between vapor and liquid in different parts of the cycle (d) In gas cycle, the working fuid can be in saturated liquid phase. (2) (3 pt) There are four processes in an ideal Rankine cycle. Which of the answers below is NOT included in those four processes? (a) Isentropic compression in pump (b) Isentropic expansion in turbine (c) Constant pressure heat addition in boiler (d) Constant volume heat rejection in condenser (3) (3 pt) There are 3 methods to increase the efficiency of a Rankine cycle. Which of the following answers does NOT increase the efficiency of the Rankine cycle? (a) Superheating the steam to high temperatures enser pressure (c) Increasing the boiler pressure (d) Decreasing the temperature of the steam in boiler exit (4) (3 pt) Which answer best describes the purpose of reheat process in Rankine cycle? (a) Increasing the efficiency (b) Increasing the moisture content in turbine exit (c) Decreasing the moisture content in turbine exit (d) Lowering the condenser pressure (5) (3 pt) Which answer best describes the purpose of regeneration process in Rankine cycle? (a) Increasing the efficiency (b) Increasing the moisture content in turbine exit (c) Decreasing the moisture content in turbine exit (d) Lowering the condenser pressure (6) (3 pt) How does moisture content in turbine exit change if the steam is to be superheated to high temperature in Rankine cycle? The boiler and condenser pressure remains unchanged. (a) Increases (b) Decreases (c) Remains constant (d) May increase or decrease (7) (3 pt) Which answer best describes the name of the cycle shown on the schematic below? (a) Vapor-compression refrigeration cycle (b) Reheat Rankine cycle (c) Regeneration Rankine cycle (d) Expansion valve throttling

Explanation / Answer

1-b ( in gas cycle the phase of working fluid doesn't change only exand and compressed)

2-d ( its constant pressure heat rejection in condenser)

3-d ( increase the efficiency of rankine cycle by part a,b & c.)

4-c ( moisture content decrease)

5-a ( main purpose of regeneration is increasing the efficiency)

6-b ( moisture content decrease)

7- insufficient data ( No schematic diagram)

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