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GATE 2019 Thermodynamics SuperQuiz- 1

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Question 1

In process, it involves interaction of many energy fluxes. Find the internal energy of the closed system undergoing change of state. Where Q₁ = 34 kJ, Q₂ = 27 kJ, and Q₃ = 15 kJ and W₁ = 15 kNm, W₂ = 12 kNm, W₃ = 10 kNm & W₄ = 5 kNm.

Question 2

1600 kJ of energy is transferred from a heat reservoir at 800 K to another heat reservoir at 400 K. The amount of entropy generated during the process would be (in kJ/K) ___

Question 3

In a new temperature scale °X, the boiling and freezing point of water at one atmosphere are 200 °X and 100 °X respectively, is corrected with centigrade scale. The reading 0 °X on the centigrade scale (in °C) is

Question 4

A heat pump for domestic heating operates between a cold system at 0 °C and hot system at 60 °C, what is the minimum electric power consumption (in kW) if the heat rejected is 80000 kJ/hr?

Question 5

Air enters an adiabatic nozzle at 3 bar and 200 °C with a velocity of 10 m/s and leave the nozzle at 2 bar and 150°C. Exit velocity of the air will be (in m/sec). Take C_p air=1.005 kJ/kg-K.

Question 6

Work is done on an adiabatic system due to which its velocity changes from 10 m/s to 20 m/ s. elevation increases by 20 m and temperature increases by 1 K. The mass of the system is 10 kg. Cv= 100 J/(kg K) and gravitational acceleration is 10 m/s². If there is no change in any other component of the energy of the system, the magnitude of total work done (in kJ) on the system is ____________

Question 7

A certain amount of an ideal gas is initially at a pressure P₁ and temperature T₁. First, it undergoes a constant pressure process 1-2 such that T₂ = 3T₁/4. Then, it undergoes a constant volume process 2-3 such that T₃=T₂/2. The ratio of the final volume to the initial volume of the ideal gas is

Question 8

One kg of air (R = 287 J/kg-K) undergoes an irreversible process between equilibrium state 1 (20 °C , 0.9 m³) and equilibrium state 2 (20 °C, 0.6 m³) The change in entropy S₂ - S₁ (in J/kg-K) is_____?

Question 9

A 1000 Ω resistor carrying a current of 10 A for 2 sec is kept at a constant temperature of 27 °C by a stream of cooling water. Entropy change of the universe is ________ J/K.

Question 10

A heat transformer is a device that transfers a part of the heat, supplied to it at an intermediate temperature, to a high temperature reservoir while rejecting the remaining part to a low temperature heat sink. In such a heat transformer, 100 kJ of heat is supplied at 350 K. The maximum amount of heat in kJ that can be transferred to 400 K, when the rest is rejected to a heat sink at 300 K is

Question 11

A reversible heat engine operates with three thermal reservoirs and delivers 50 kW power. The engine absorbs 1000 kJ/s from a reservoir at 600 K. Heat is sent to reservoirs having temperature of 400 K and 300 K. The thermal efficiency (in %) of the engine is

Question 12

In reversible non-flow process, the work done by a system in accordance with $Description: Description: 02_Thermodynamics_BLok_files\image045.png$ where P is the pressure in bar.Evaluate the work done on the system (in kJ) as pressure increases from 0.5 bar to 10 bar

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ESE & GATE ME Thermodynamics

Feb 16ESE & GATE ME