1. Insystem, no mass can cross its boundary. However, it only allows energytransfer across its boundaryo Control systemo Closed systemo Isolated system2. Heat transferred to a system and work done by a system are always positive.o Trueo False3.——is a device that decreases the velocity of a fluid by increasing its pressure.o Nozzleo Diffusero Compressoro Turbine4. A heat engine may not reject any heat to a low-temperature reservoir and stillcan complete a cycle.o Trueo False5. Heat is removed from the compartment of a refrigerator at a rate of 250 kJ/min. Therefrigerator consumes 0.8 kW, determine the COP of the refrigerator.6. It has been proved experimentally by joule that the internal energy is a function ofo Temperature onlyo Pressure onlyo Volume onlyo All together7. The combination of flow energy and internal energy gives -8. A process during which there is no heat transfero Adiabatico Isentropico Polytropico Isothermal9. Heat is transferred to a heat engine from a furnace at a rate of 80 MW. If the rate ofwaste heat rejection to a nearby river is 50 MW, determine the thermal efficiency.10. The-is related to the molecular structure and activity of a system.o Potential energyo Internal energyo Kinetic energyo Total energy

1. In system, no mass can cross its boundary. However, it only allows energy transfer across its boundary ———- o Control system o Closed system o Isolated system 2. Heat transferred to a system and work done by a system are always positive. o True o False 3. - is a device that decreases the velocity of a fluid by increasing its pressure. o Nozzle o Diffuser o Compressor o Turbine temperature reservoir and still

1. In system, no mass can cross its boundary. However, it only allows energy transfer across its boundary ———- o Control system o Closed system o Isolated system 2. Heat transferred to a system and work done by a system are always positive. o True o False 3. - is a device that decreases the velocity of a fluid by increasing its pressure. o Nozzle o Diffuser o Compressor o Turbine temperature reservoir and still

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter6: Forced Convection Over Exterior Surfaces

Section: Chapter Questions

Problem 6.8P

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(i) A can of soft drink at room temperature is put into the refrigerator so that it will cool. Would you model the can of soft drink as a closed system or as an open system? (ii) A candle is burning in a well-insulated room. Taking the room (the air plus the candle) as the system, determine if there is any heat transfer during the burning process. Explain how?
Work is done on an adiabatic system due to which its velocity changes from 10 m/s to 20 m/s, elevation increases by 20 m and temperature increases by 1 K. The mass of the system is 10 kg, Cv = 100 J/kg-K and gravitational acceleration is 10 m/s² .if there is no change in any other component of the energy of the system, find out the magnitude of total work done on the system.
Steam expands steadily at a constant temperature. The flow rate is 13.6 kg/min with an inlet state of wet steam (water) at 80% quality to a final state of 70°C and 2.5 MPa. The change of kinetic energy across the device is 3.5 kJ/kg, and the heat added is 21.81 kW. Determine (a) the enthalpy of conditions 1&2, (b) the heat transfer in kJ/kg. (c) the work, and (d) the system power.
Explain the energy is recognized as heat transfer only as it crosses the system boundary?
An ideal gas passes a diffuser. At the diffuser inlet, the temperature is T1 = 350.00 K, the pressure P1 = 100.00 kPa, the velocity V1 = 200.00 m/s, and the inlet area A1 = 0.30 m2. At the exit, the velocity is very small. The specific heat of the ideal gas at the constant pressure is cp = 1.0050 kJ/(kg·K). The gas constant is R = 0.2870 kPa·m3/(kg·K). Determine the density at the inlet, ρ1 __________(kg/m3)
3. An air compressor which operates at 900 rpm has a piston displacement of 4500cm3. Determine the mass flow rate of air at standard density considering that the volumetric efficiency is 77%. a. 314.57 kg/hr b. 324.35 kg/hr c. 137.54 kg/hr d. 224.53 kg/hr Please answer this immediately. Thank you!
A mass of 7 kg undergoes a process during which velocity decreases from 32 m/s to 19m/s, while the elevation remain unchanged. The initial specific internal energy of the mass is 1.24 kJ/kg and the final specific internal energy is 2.08 kJ/kg. During the process, the mass receives 2 kJ of energy by heat transfer through its bottom surface and loses 0.8 kJ by heat transfer through its top surface. How much is the work in kJ? (hint: be consistent with units) ( 2 decimal places)
A 10 kg steel bar at 627 °C is dropped in 100 kg of oil at 30 °C. The specific heats ofsteel and oil are 0.5 kJ/kg K and 3.5 kJ/kg K, respectively. Determine the change inentropy of the steel, oil, and the universe.
A system has a mass velocity of 0.5 kg/s. The enthalpy, speed and height at the entrance of the system are worth respectively 55.6 Kcal/kg, 30 m/s and 90 m. At the exit, the new values of enthalpy, speed and height are 55 Kcal/kg, 0.30 m/s and -3 m. 2.5 Kcal/s are communicated to the system. What amount of work is done by the system: a) per kg of fluid, b) per minute, c) expressed in horsepower?
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Question # 2 a) When is work said to be done by a system? b) Why work is considered path function while pressure is considered a point function? c) Explain why work is not a property of the system.
Helium is used in the Carnot engine where the volumes beginning with constant temperature heat addition are V1= 0.3565 m3; V2= 0.5130 m3; V3= 8.0 m3; V4= 5.57 m3. Determine the thermal efficiency. Use 1.66 as the specific ratio of helium.