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In a process occurring in a closed system F , the heat transferred from F to the surroundings E is 600 J. If the temperature of E is 300 K and that of F is in the range 380 - 400 K , the entropy changes of the sur1 AnswerF or the reaction: 4Ag(s, pure) + O2(g)⟶2Ag2O(s, pure), the standard enthalpy change, Δ𝐻0 = − 61080 J, and the standard entropy change, Δ𝑆0 = − 132.22 J K−1, in the temperature range from 298 K to 500 K. The temperature above which Ag2O decomposes in an atmosphere containing oxygen at a partial pressure 𝑝𝑂2 = 0.3 atm is __________ (in K to one decimal place).0 AnswerA reversible cycle receives 40 kJ of heat from one heat source at a temperature of 127 C and 37 kJ from another heat source at 97 C. The heat rejected (in kJ) to the heat sink at 47 C is __________ Gate-20161 AnswerA mbient air at 30◦C dry bulb temperature and 80% relative humidity was heated to a dry bulb temperature of 80◦C in a heat exchanger by indirect heating. The amount of moisture gain (g kg-1 dry air) during the process would be _______.0 AnswerF ive moles of gas A (volume V1) and 3 moles of gas B (volume V2) were kept in separate containers. These two gases are completely transferred to a new container of volume V. Assuming isothermal condition, and that the work done is only mechanical, the entropy change of the system is ____________ Joules K-1. (R = 8.3 J K-1 mole-1)1 AnswerThe contents of a well-insulated tank are heated by a resistor of 23Ω in which 10A current is flowing. -gate-mechanical-20111 AnswerO ne mole of helium gas in an isolated system undergoes a reversible isothermal expansion at 25 C from an initial volume of 2.0 liters to a final volume of 10.0 liters. The change in entropy (S) of the surroundings is ______ J K1 (up to two decimal places).0 AnswerAdiabatic work of 200 kJ is done on ideal gas of mass m = 1 kg (Cv=1000 j/kgk ), which is stored in a rigid container at a pressure of 100 kPa and temperature 300 K.1 AnswerT he rate of heat transfer from a metal plate is 1000 W m-2. The surface temperature of the plate is 120◦C and ambient temperature is 20◦C. The convective heat transfer coefficient (W m-2 ◦C-1) using the Newton’s law of cooling will be _______.0 AnswerA n insulated storage tank contains 1000 kg liquid of specific heat 10 kJ kg-1 K-1. The liquid is heated by saturated steam, condensing in a helical coil at a temperature of 180 oC. The heat transfer area of the coil is 0.1 m2. If the overall heat transfer coefficient is constant at 1000 W m-2 K-1, then the time (in hours) required to raise the temperature of the liquid in the tank from 20 oC to 80 oC is ____________ (rounded off to second decimal place).0 AnswerO ne kg of air (that can be considered a calorically perfect gas with characteristic gas constant R = 287 J/kg-K and specific heat ratio 1.4 ) undergoes a constant-volume process from an initial static pressure of 1 bar to a final static pressure of 4 bar. The increase in entropy (in J/kg-K) of air is ______0 AnswerA steel is plastically worked in the temperature range below the nose of the TTT curve and above Ms, followed by quenching to produce fine martensite. What is this process called?5 AnswerConsider the following statements for an ideal gas undergoing a reversible non-flow process: P. If the process is adiabatic, the change in enthalpy of the gas is necessarily zero. Q. If the process is adiabatic, the change in entropy of the gas is necessarily zero. R. If the process is isothermal, the change in enthalpy of the gas is necessarily zero. S. If the process is isothermal, the change in entropy of the gas is necessarily zero1 AnswerT he molar heat capacity of a substance is represented in the temperature range 298 K to 400 K by the empirical relation , 14 p m C bT J K–1 mol–1, where b is a constant. The molar enthalpy change when the substance is heated from 300 K to 350 K is 2 kJ mol–1. The value of b is___________ J K–2 mol–1. (Up to two decimal places)0 AnswerT he humidity of air at a dry-bulb temperature of 65 oC is 0.025 kg water/kg dry air. The latent heat of vaporization of water at 0 oC is 2500 kJ/kg. The psychrometric ratio of air is 0.95 kJ (kg dry air)-1 K-1. Considering 0 oC as reference temperature, the enthalpy of air (in kJ/kg) at its adiabatic saturation temperature of 35 oC is ___________ (rounded off to two decimal places).0 AnswerT he wall of a pipe of radius 1 m is at a uniform temperature of 200 oC, and is covered by insulation of thickness 0.1 m. The ambient air outside the insulated pipe is at 20 oC and has heat transfer coefficient of 10 W m-2 K-1. The thermal conductivity of the insulation material is 0.05 W m-1 K-1. If the heat transfer occurs at steady state, the temperature (in oC) of the outer surface of insulation is __________ (rounded off to second decimal place).0 AnswerOne kmol of an ideal gas (Cp = 21 kJ/kmol.K) undergoes a constant pressure process from 300 K to 500 K. The molar entropy of the gas at 300 K is 150 kJ/kmol.K. The molar entropy (in kJ/kmol.K) at 500 K (up to 1 decimal place) is ________.0 AnswerHot water at 95 C is used in a plate heat exchanger for heating 2 kg s^-1 fruit juice from 45C to 75C. Specific heat capacity of fruit juice is 3.7 kJ kg^-1 K ^-1. Final temperature of the hot water is 70C. Overall heat transfer coefficient is 1122 W1 AnswerAn air-conditioner maintains the room temperature at 27 oC while the outside temperature is 47 oC. The heat conducted through the walls of the room from outside to inside due to temperature difference is 7000 W. The minimum work done by the compressor of the air-conditioner per unit time is ________ W0 AnswerOne kg of an ideal gas (gas constant R=287 J/kg.K) undergoes an irreversible process from state-1 (1 bar, 300 K) to state -2 (2 bar, 300 K). The change in specific entropy (s1-s2) of the gas (in J/kg.K) in the process is 1 Answer
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