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ISRO ME Quiz 2 : Thermodynamics

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Question 1

The formation of frost on cooling coils in a refrigerator

Question 2

One hundredth of a kilogram of air is compressed in a piston-cylinder device At an instant of time when T = 400 K, the rate at which work is being done on the air is 8.165 kW, and heat is being removed at a rate of 1.0 kW, the rate of temperature rise will be if Cv= 0.7165kJ/kgK

Question 3

A well insulated vessel containing air is heated to double the pressure and temperature 150% of initial. The amount of air that leaked is

Question 4

A rigid insulated tank contains 1 kg of air at 2 bar and 27 °C. A paddle wheel inside the tank is rotated by an external motor till the temperature rises to 77 °C. The exergic efficiency of the process is ________ %.
[Assume surrounding air is at 27 °C and C_v for air = 0.72 kJ/kg °C]

Question 5

A steam power plant operates on a theoretical reheat cycle as shown below. Steam enters high pressure turbine at 150 bar and 550 °C (h₃ = 3450 kJ/kg) and expands upto 40 bar (h₄ = 3050 kJ/kg). It is reheated at constant pressure of 40 bar to 550 °C (h₅ = 3560 kJ/kg) and expands through the low pressure turbine to a condenser at 0.1 bar (h₆ = 2300 kJ/kg). Also given, h_f1 (at 0.1 bar) = 191.8 kJ/kg.
Thermal efficiency (in %) and steam rate (kg/kWh) of the plant neglecting pump work respectively are:

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Question 6

An ideal gas undergoes a constant volume process with total heat transfer of 20 kJ, if the temperature of source and sink arc 120⁰C and 27⁰C, the network transfer will be( in KJ)

Question 7

Virial equation of state which expressed as a power series in reciprocal volumes and given by
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Where B, C, D etc. are known as virial coefficients which represents

Question 8

Entropy of wet stream (1 kg) is given by

Question 9

Using the Clausius–Clapeyron equation find the enthalpy of vaporization(in kJ/kg). The following data is given: At 200°C, v_g=0.1275 m³/kg and V_f= 0.001157 m³/kg and change of pressure with respect to temperature $Description: Description: 02_Thermodynamics_BLok_files\image035.png$ .

Question 10

A pump handling a liquid raises its pressure from 1 bar to 30 bar. Take the density of the liquid as 990 kg/m³. The isentropic specific work done by the pump (in kJ/kg) is __________.

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ESE & GATE ME Thermodynamics

Apr 16ESE & GATE ME