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MP Sub-Engineer ME: First Law of Thermodynamics Quiz 2
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Question 1
Which of the following represents the perpetual motion of the first kind
Question 2
A closed gaseous system undergoes a reversible constant pressure process at 2 bar in which 100 kJ of heat is rejected and the volume changes from 0.2 m3 to 0.1 m3. The change in the internal energy of the system is
Question 3
A cylinder filled with 2 kg of oxygen(γ=1.4) is heated at constant pressure from 27oC to 127oC, the heat supplied is equal to
Question 4
A fan is to accelerate quiescent air to a velocity of 12 m/s at a rate of 3 m3/sec. If the density of air is 1.15 kg/m3, the minimum power that must be supplied to the fan is _____ Watt.
Question 5
A 4 kW, 20 liter water heater is switched on for 10 minutes. The heat capacity Cp for water is 4 kJ/kg-K. Assuming all the electrical energy has gone into heating the water, what is the increase of the water temperature (in °C)?
Question 6
A gas contained in a cylinder is compressed, the work required for compression being 5000 kJ. During the process, heat interaction of 2000 kJ causes the surroundings to the heated. The change in internal energy of the gas during the process is
Question 7
An ideal gas when compressed to half of its initial volume in a constant temperature process, 600 J of energy is removed from gas during compression in the from of heat. What will be the change in internal energy?
Question 8
A cylinder contains 5m3 of an ideal gas at a pressure of 1 bar. This gas is compressed in a reversible isothermal process till its pressure increases to 5 bar. The work in kJ required for this process is
Question 9
The system liberates 84 kJ of heat when changing from state A to B. If the internal energies of state A is 0 while that of state B is 28 kJ. Determine the work done during the process.
Question 10
The enthalphy drop for flow through convergent horizontal nozzles is 100 kJ/kg. If the velocity of approach at inlet to the nozzle is negligible, the exit velocity of the fluid is
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