Gearup-JE'19: Thermodynamics Quiz-5

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Question 1

Perpetual motion machine of second kind violates the

• AFirst law of thermodynamics
• BKelvin-plank statements
• CClausius statement
• DThird law of thermodynamics

Question 2

A football was inflated to a gauge pressure of 1 bar when the ambient temperature was 15C. When the game started next day, the air temperature at the stadium was 5C. Assume that the volume of the football remains constant at 2500 cm3. Gauge pressure of air to which the ball must have been originally inflated so that it would equal 1 bar gauge at the stadium is __________.

• A2.23 bar
• B1.94 bar
• C1.07 bar
• D1 bar

Question 3

The enthalpy of steam is defined as __________.

• ADifference of internal energy and product of pressure and volume.
• BProduct of internal energy and pressure.
• CSum of internal energy and product of pressure and volume.
• DAmount of heat change divided by the absolute temperature.

Question 4

Which of the following is the correct expression for the maximum thermal efficiency (η) of a system undergoing a reversible power cycle while operating between thermal reservoirs at temperature Tc and Th

• Aη = Tc/Th
• Bη = Th/Tc-1
• Cη = 1-Tc/Th
• Dη = 1

Question 5

A system will be thermodynamic equilibrium only if it is in __________.
A) Thermal equilibrium
B) Mechanical equilibrium
C) Chemical equilibrium

• Aonly A
• Bonly B
• Conly C
• DA, B and C

Question 6

Properties of substances like pressure, temperature and density, in thermodynamic co-ordinates are ___________.

• Apath functions
• Bpoint functions
• Ccyclic functions
• Dreal functions

Question 7

Which of the following statement is correct regarding Clausius statement of second law of thermodynamics __________.

• AHeat can’t be transferred from low temperature body to high temperature body
• BHeat can be transferred from low temperature body to high temperature body by using refrigeration cycle
• CHeat can’t be transferred from low temperature body to high temperature body without the consuming any other form of energy
• DHeat can be transferred from low temperature body to high temperature body if COP of the process is more than unity

Question 8

A carnot engine operates between and If the engine produces 300 kJ of work, what is the entropy change during heat rejection?

• A0.5 kJ/K
• B1 kJ/K
• C1.5 kJ/K
• D2 k/JK

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