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ISRO 2018 Thermodynamics Booster Quiz 3

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Question 1

In a new temperature scale say °ρ, the boiling and freezing points of water at one atmosphere are 100 °ρ and 300 °ρ respectively. Correlate this scale with the Centigrade scale. The reading of 10 °ρ on the Centigrade scale is:

Question 2

A thermal electric power plant produces 5000 MW of power. If the coal releases 70 x 105 kJ/sec of energy, then what is the rate at which heat is rejected from the power plant?

Question 3

A car engine consumes fuel at rate of 20 L/h and delivers 50 kW of power to the wheels. If heating value and density of fuel are 44,000 kJ/kg and 0.8 g/cm3 respectively, then the efficiency of the plant is _____ %.

Question 4

A mixture of ideal gas consists of 2 kg of nitrogen and 8 kg of carbon dioxide at a pressure of 250 KPa and temperature of 30oC. The equivalent gas constant (in KJ/KgK)
of the mixture is

Question 5

In a gas turbine plant operating on Brayton cycle, select the incorrect statement regarding the effect of reheating

Question 6

In Rankine cycle, the enthalpy of steam entering the turbine is 2800 KJ/Kg. The enthalpy at the end of actual expansion is 2130 KJ /Kg while enthalpy after isentropic expansion is 2000 KJ/Kg. The turbine efficiency is ____ %

Question 7

A domestic food freezer maintains at a temperature of –15 °C. The ambient temperature is +30 °C. If heat leaks into the freezer at the continuous rate of 1.75 kJ/s. What is the least power necessary to pump out this heat continuously?

Question 8

In a power plant, water (density = 1000 kg/Description: D:\GradeStack Courses\GATE Tests (Sent by Ravi)\GATE-ME-2014-Set-1_files\image051.png) is pumped from 80 kPa to 3 MPa. The pump has an isentropic efficiency of 0.85. Assuming that the temperature of the water remains the same, the specific work (in kJ/kg) supplied to the pump is
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Apr 16ESE & GATE ME