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The first law of thermodynamics discusses a. Thermal equilibrium b. Energy conservation Direction of heat flow с. d. Entropy is zero at absolute zero temperature

The first law of thermodynamics discusses a. Thermal equilibrium b. Energy conservation Direction of heat flow с. d. Entropy is zero at absolute zero temperature

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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7:19 am Tue 28 Dec * 25% I T + : 0 Question 1 Choose the correct option. [0.2 Marks each] 1. The first law of thermodynamics discusses Thermal equilibrium b. Energy conservation Direction of heat flow а. с. d. Entropy is zero at absolute zero temperature A tank contains 1 kg mass gas whose density is 700 kg/m³. The pressure is increased from 1 bar to 3 bar. The approximate specific boundary work of the system is 2. Cannot be find since some data is missing а. b. 285 kJ/kg с. 0 kJ/kg d. 0.285 kJ/kg 3. The nozzle is a device in which а. Area decreases b. Area increases Velocity decreases d. Velocity increases с. 4. Choose the correct statement/s with respect to entropy change during a process Entropy increases with increase in pressure at constant temperature b. Entropy increases with increase in temperature at constant pressure Entropy can be kept constant by systematically increase both pressure and temperature d. Entropy can not be changed а. с. 5. The isentropic process is also called as Adiabatic process b. Irreversible adiabatic process Reversible adiabatic process d. Reversible isochoric process а. с. Question 2 [1 Mark] Draw Pv and Ts diagram of reversible isobaric process. Write the relationship between thermodynamic properties. Question 3 [1 Mark] Refrigerant R-134a at 500 kPa and 120+last two digits enters an adiabatic nozzle steadily with a velocity of 15 cm/s and leaves at 200 kPa and 20 °C. Determine: a) The exit velocity b) The inlet to exit area ratio c) The inlet exit density ratio Question 4 [1 Mark]
Transcribed Image Text:7:19 am Tue 28 Dec * 25% I T + : 0 Question 1 Choose the correct option. [0.2 Marks each] 1. The first law of thermodynamics discusses Thermal equilibrium b. Energy conservation Direction of heat flow а. с. d. Entropy is zero at absolute zero temperature A tank contains 1 kg mass gas whose density is 700 kg/m³. The pressure is increased from 1 bar to 3 bar. The approximate specific boundary work of the system is 2. Cannot be find since some data is missing а. b. 285 kJ/kg с. 0 kJ/kg d. 0.285 kJ/kg 3. The nozzle is a device in which а. Area decreases b. Area increases Velocity decreases d. Velocity increases с. 4. Choose the correct statement/s with respect to entropy change during a process Entropy increases with increase in pressure at constant temperature b. Entropy increases with increase in temperature at constant pressure Entropy can be kept constant by systematically increase both pressure and temperature d. Entropy can not be changed а. с. 5. The isentropic process is also called as Adiabatic process b. Irreversible adiabatic process Reversible adiabatic process d. Reversible isochoric process а. с. Question 2 [1 Mark] Draw Pv and Ts diagram of reversible isobaric process. Write the relationship between thermodynamic properties. Question 3 [1 Mark] Refrigerant R-134a at 500 kPa and 120+last two digits enters an adiabatic nozzle steadily with a velocity of 15 cm/s and leaves at 200 kPa and 20 °C. Determine: a) The exit velocity b) The inlet to exit area ratio c) The inlet exit density ratio Question 4 [1 Mark]
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