I. Indicate whether the following statements are true or false (each 0.5 point) 1. The time rate of change of mass within the control volume defines a mass flow rate. A: True B: False 2. The sum of all inlet mass flow rates minus the sum of all outlet mass flow rates defines the mass rate balance. A: True B: False 3. For steady-state operation some properties are unchanging in time. A: True B: False 4. Volumetric flow rate is expressed in units of kg/(s?m³). A: True B: False 5. The total rate at which mass enters the control volume equals the total rate at which mass exits defines the conservation of mass at steady-state. A: True B: False
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" This statement is true because the mass flow rate is indeed the rate at which mass enters or leaves a control volume over time. Step 2: Evaluate statement 2: "The sum of all inlet mass flow rates minus the sum of all outlet mass flow rates defines the mass rate Show more…
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3. Answer the following questions: (Total points: 16) a. A closed system is also called a control volume, true or false? (Point 1) b. A control surface is the outer surface of a system that can be easily controlled, true or false? (Point 1) c. When is the flow through a control volume steady? (Point 1) Ans: (In one sentence) d. Define mass and volume flow rates. (Points 2) Ans: Mass flow rate (in one sentence): Volume flow rate (in one sentence): e. How mass and volume flow rate are related to each other? (Points 2) Ans: f. Does the amount of mass entering a control volume have to be equal to the amount of mass leaving during an unsteady-flow process? Yes/no. (Points 1) Ans: g. Consider a device with one inlet and one outlet. If the volume flow rates at the inlet and at the outlet are the same, is the flow through this device necessarily steady? Yes/no. (Points 1) Ans: h. For the same device to be steady, ....................... flow rate through the device must remain constant. Fill in the blank. (i) mass (ii) volume (iii) energy (Point 1) i. Flow energy and flow work are two different property of a system, true or false? (Point 1) j. What is flow energy? (Point 1). Ans: (In one sentence) k. Do fluids at rest possess any flow energy? Yes/No. (Point 1) Ans: l. Flowing fluids possess flow energy in addition to the forms of energy a fluid at rest possesses, true or false? (Point 1) m. The total energy of a fluid at rest consists of (i) internal energy, (ii) kinetic energy, (iii) potential energy, (iv) all (v) none (Point 1) n. The total energy of a flowing fluid consists of (i) internal energy, (ii) kinetic energy, (iii) potential energy, (iv) Flow energy (v) all (vi) none (Point 1)
Sri K.
Indicate whether each of these statements is true or false. Change the wording of each false statement to make it true. (a) It is possible to change the rate constant for a reaction by changing the temperature. (b) The reaction rate remains constant as a first-order reaction proceeds at a constant temperature. (c) The rate constant for a reaction is independent of reactant concentrations. (d) As a second-order reaction proceeds at a constant temperature, the rate constant changes.
C. Write true or false. Correct the false statements. 1. The density of gases is more than that of solids. 2. The volume of any liquid completely filled in a relative density bottle remains the same. 3. We need to know only the mass of the substance to determine its relative density. 4. Kerosene is lighter than water. 5. The density of a substance is the ratio of its density to the density of water at 4°C. 6. On multiplying the relative density by 1000, one gets the density of a substance in kg/m3. 7. A body of density 3.5 g/cm3 will float on water. 8. The base of the bulb of the hydrometer is filled with lead so that the hydrometer can float in a horizontal position. 9. Convection currents occur due to differences in density in different sections of a liquid or gas. 10. A land breeze arises due to the differential heating between land and water surfaces.
Monisha S.
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