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BARC 2019: Thermodynamics Nuclear Quiz-1
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Question 1
A rigid container has air initially at 1.5 bar, 27
brought to a final temperature of 127
by heat transfer from a thermal reservoir at 227
. The irreversibility (in kJ/kg) is ______. (atmospheric temperature = 27
, atmospheric pressure = 1 bar, cp = 1.005 kJ/kgK, cv = 0.718 kJ/kgK)
brought to a final temperature of 127 by heat transfer from a thermal reservoir at 227. The irreversibility (in kJ/kg) is ______. (atmospheric temperature = 27, atmospheric pressure = 1 bar, cp = 1.005 kJ/kgK, cv = 0.718 kJ/kgK)Question 2
A four stroke double acting petrol engine is used 90 kW brake power on a job. The engine used 40 kg/h of fuel under working condition and its mechanical efficiency is 75%. If the engine friction power reduces by 10 kW then the saving of fuel (in kg/h) is (assume, indicated thermal efficiency remain constant)
Question 3
Steam at 40 bar, 500°C flowing at the rate of 1.5 kg/sec expands in an h.p turbine to 2 bar with an isentropic efficiency of 80%. Determine the enthalpy of steam of the exit of high pressure turbine in kW.
At 40 bar, 500°C; V = 0.086 m3/kg, U = 3100 kJ/kg; h = 3445 kJ/kg, s = 7.09 kJ/kg
At 2 bar; vf = 0.001061 m3/kg, vg = 0.886 m3/kg, hf=504.7kJ/kg, hg=2707 kJ/kg,
sf=1.503kJ/kg, sg=7.127kJ/kg
Question 4
The pressure and temperature at the start of compression of diesel cycle is 1 bar and 15°C. The pressure at the end of expansion is 4bar, the maximum temperature when the compression ratio is 15 and the specific heat at constant pressure is 1.008 kJ/kgK is ____°C
Question 5
The temperature of two thermometers A and B are tA and tB . The reading tA and tB agree at the ice point and steam point and are related as
tA = a + btB + ctB2
Where, a, b and c are constants and tA and tB are in
.
The thermometers A and B, both are immersed in a fluid and reads 45
and 47
respectively. The thermometer reading A, when the thermometer B reads 22
tA = a + btB + ctB2
Where, a, b and c are constants and tA and tB are in
. The thermometers A and B, both are immersed in a fluid and reads 45
and 47 respectively. The thermometer reading A, when the thermometer B reads 22 Question 6
3kg of steam at 120 °C and 1 atm is mixed with 25kg of water at ambient temperature of 25 °C. Calculate the irreversibility (in kJ) produced if the steam condenses at 100 °C with Latent heat of condensation as 2260 kJ/kg. Specific heat of steam is 1.99kJ/kgK.
Question 7
Air after passing from a heating coil of temperature 45℃ is obtained at 38℃. Calculate inlet air temperature, if the bypass factor of the coil is 0.35.
Question 8
A reversible thermodynamic device operates between the temperature limits of 500K, 1100K and 300K and produces 1000kJ of work. If it absorbs 500kJ of heat from Thermal reservoir of 500K, find the heat exchanged with 300K reservoir.
Question 9
A 4 cylinder - 4 stroke petrol engine coupled to hydraulic dynamometer at constant speed of 2500 rpm and the following readings are obtained:
B.P. with all cylinders operating = 20.5 kW
B.P. with cylinders no. 1 is cut out = 15.2 kW
B.P. with cylinders no. 2 is cut out = 15.5 kW
B.P. with cylinders no. 3 is cut out = 14.8 kW
B.P. with cylinders no. 4 is cut out = 15.3 kW
Diameter of cylinder = 0.12 m
Stroke of piston = 0.15 m
The indicated mean effective pressure (imep) (in MPa) is
B.P. with all cylinders operating = 20.5 kW
B.P. with cylinders no. 1 is cut out = 15.2 kW
B.P. with cylinders no. 2 is cut out = 15.5 kW
B.P. with cylinders no. 3 is cut out = 14.8 kW
B.P. with cylinders no. 4 is cut out = 15.3 kW
Diameter of cylinder = 0.12 m
Stroke of piston = 0.15 m
The indicated mean effective pressure (imep) (in MPa) is
Question 10
Consider following statements:
I) A gas is said to be an ideal gas when intermolecular forces are zero.
II) A gas behaves as an ideal gas under high temperature and high pressure.
III For an ideal gas, the temperature variation w. r. t. pressure during throttling condition is zero.
IV) A gas cools during expansion only when the Joule Thomson coefficient is negative.
Which of the following statements is/are correct?
I) A gas is said to be an ideal gas when intermolecular forces are zero.
II) A gas behaves as an ideal gas under high temperature and high pressure.
III For an ideal gas, the temperature variation w. r. t. pressure during throttling condition is zero.
IV) A gas cools during expansion only when the Joule Thomson coefficient is negative.
Which of the following statements is/are correct?
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