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GATE ME: Thermal Science Champion Quiz 3
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Question 1
Two systems have the same wet bulb temperature at 20 °C. System “A” has Dry bulb temperature of 25 °C since it has a relative humidity of 65%. System “B” has a relative humidity of 30%. What will be its dry bulb temperature?
Question 2
A device containing an ideal gas executes the cycle shown.
This is a.
This is a.
Question 3
Which information is correct in case of I. C. Engine?
Question 4
A diesel engine is usually more efficient than a spark ignition engine because
Question 5
For the same values of peak pressure, peak temperature and heat rejection, the correct order of efficiencies for Otto. Dual and Diesel cycles is
Question 6
In an air-standard Otto cycle, the compression ratio is 10. The condition at the beginning of the compression process is 100 kPa and 27 °C. Heat added at constant volume is 1500 kJ/kg, while 700 kJ/kg of heat is rejected during the other constant volume process in the cycle. Specific gas constant for air = 0.287 kJ/kgK. The mean effective pressure (in kPa) of the cycle is
Question 7
F or water at 23℃, dps⁄dTs = 0.189 kPa⁄K (ps is the saturation pressure in kPa and Ts is the saturation temperature in K) and the specific volume of dry saturated vapour is 43.38 m3/kg. Assume that the specific volume of liquid is negligible in comparison with that of vapour. Using the Clausius-Clapeyron equation, an estimate of the enthalpy of evaporation of water at 23℃(in kJ/kg) is __________
Question 8
Consider the Carnot cycle shown. In this 0.5 moles of an ideal monoatomic gas is given for T1 = 500 K, V2 = 2V1 and V3 = 1.5V2. What will be the numerical values for 
Question 9
Which combination of the following statements is correct?
P: A gas cools upon expansion only when its Joule–Thomson co–efficient is positive in the temperature range of expansion.
Q: For a system undergoing a process, its entropy remains constant only when the process is reversible.
R: The work done by a closed system in an adiabatic process is a point function.
S: A liquid expands upon freezing when the slope of its fusion curve on Pressure. Temperature diagram is negative.
P: A gas cools upon expansion only when its Joule–Thomson co–efficient is positive in the temperature range of expansion.
Q: For a system undergoing a process, its entropy remains constant only when the process is reversible.
R: The work done by a closed system in an adiabatic process is a point function.
S: A liquid expands upon freezing when the slope of its fusion curve on Pressure. Temperature diagram is negative.
Question 10
A source at a temperature of 500 K provides 1000 kJ of heat. The temperature of environment is 27 °C. The maximum useful work (in kJ) that can be obtained from the heat source is ________
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Aug 17ESE & GATE ME
