THERMODYNAMICS

1. The energy of the isolated system is always a constant, which is given by:

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(a) Zeroth law of thermodynamics

(b) First law of thermodynamics

(c) Second law of thermodynamics

(d) Third law of thermodynamics

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2. A series of operations, which takes place in a certain order and restore the initial conditions at the end, is known as

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(a) Reversible cycle

(b) Irreversible cycle

(c) Thermodynamic cycle

(d) None of these

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3. Heat and work are :

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(a) Intensive properties

(b) Extensive properties

(c) Point functions

(d) Path functions

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4. What are the properties of a thermodynamic system whose value for the entire system is equal to the sum of their values for individual parts of the system?

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(a) Thermodynamic properties

(b) Extensive properties

(c) Intensive properties

(d) Specific properties

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5. Consider the following properties: 1. Temperature 2. Viscosity 3. Specific entropy 4. Thermal conductivity Which of the above properties of a system is/are intensive?

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(a) 1 only

(b) 2 and 3 only

(c) 2, 3 and 4 only

(d) 1, 2, 3 and 4

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6. An open system

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(a) is a specified region where transfers of energy and / or mass take place

(b) is a region of constant mass and only energy is allowed to cross the boundaries

(c) cannot transfer either energy or mass to or from the surroundings

(d) has an enthalpy transfer across its boundaries and the mass within the system is not necessarily constant

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7. The law which provides the basis of temperature measurement is:

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(a) Third law of thermodynamics

(b) Zeroth law of thermodynamics

(c) First law of thermodynamics

(d) Second law of thermodynamics

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8. Which one of the following is the extensive property of the system?

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(a) Volume

(b) Pressure

(c) Temperature

(d) Density

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9. Pressure exerted by a gas in a closed container is:

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(a) Weak function of Density and Temperature

(b) Weak function of Density and Volume

(c) Strong function of Density and Temperature

(d) Strong function of Density and Volume

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10. Which of the following items is not a path function?

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(a) Heat

(b) Work

(c) Kinetic energy

(d) Thermal conductivity

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11. Which one of the properties given below is an intensive property of the system

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(a) composition

(b) volume

(c) kinetic energy

(d) entropy

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12. Which of the following is an example of irreversible process?

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(a) Polytropic expansion of fluid

(b) Unrestricted expansion of gases

(c) Isothermal expansion

(d) Electrolysis

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13. Which of the following is considered as thermodynamic potential?

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(a) Temperature

(b) Internal energy

(c) Enthalpy

(d) Entropy

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14. Pressure of 1 (one) atmosphere is equivalent to:

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(a) 0.101325 MPa

(b) 750 mm of mercury

(c) 1 bar

(d) 0.101325 kPa

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15. Air is compressed in a cylinder such that the volume changes from 0.2 to 0.02 m3. The initial pressure is 200 kPa. If the pressure is constant, the approximate work is

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(a) –36 kJ

(b) –40 kJ

(c) –46 kJ

(d) –52 kJ

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16. Which of the following processes is irreversible process

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(a) Isothermal

(b) Adiabatic

(c) Throttling

(d) All of the above

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17. Which of the following processes are thermodynamically reversible?

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(a) Throttling

(b) Free expansion

(c) Constant volume and constant pressure

(d) Isothermal and adiabatic

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18. The internal energy of an ideal gas is function of

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(a) pressure only

(b) absolute temperature only

(c) pressure and volume

(d) pressure, volume and temperature

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19. Work output from a system is at the expense of internal energy is a non flow process carried out

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(a) at constant pressure

(b) at constant volume

(c) adiabatically

(d) polytropically

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20. The absolute zero pressure will be

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(a) When the molecular momentum of the system becomes zero

(b) at sea level

(c) at the temperature of –273K

(d) at the centre of the earth

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21. In reference to Thermodynamic equilibrium, it is required to have,

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(a) Mechanical Equilibrium

(b) Chemical Equilibrium

(c) Thermal Equilibrium

(d) Mechanical, Chemical and Thermal Equilibrium

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22. If the value of n is zero in the equation PVn = C, then the process is called

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(a) constant volume process

(b) constant pressure process

(c) idiabatic process

(d) isothermal process

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23. The temperature at which the volume of gas becomes zero is called

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(a) absolute scale of temperature

(b) absolute zero temperature

(c) absolute temperature

(d) dew point temperature

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24. In the polytropic process equation PVn = constant if n is infinitely large, the process is termed as-

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(a) Constant volume

(b) Constant pressure

(c) Constant temperature

(d) Adiabatic

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25. Which of the following is correct statement for 'Energy (E)'?

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(a) 'Energy (E)' is not the property of system

(b) 'Energy (E)' is path function

(c) Change in energy between two states of a

system is different for different path followed

(d) dE = 0

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26. The equation PV = mRT is essentially valid for

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(a) Perfect gas

(b) Real gas

(c) Monoatomic gas

(d) Mixture of gases

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27. In a steady flow reversible adiabatic process work done is equal to

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(a) Change in internal energy

(b) Change in entropy

(c) Change in enthalpy

(d) Heat transferred

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28. 1ºC is equal to

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(a) 273.15 K

(b) 274.15 K

(c) 283.15 K

(d) 263.15 K

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29. Thermocouples are generally used for measuring temperature:

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(a) 500 oC

(b) 1000 oC

(c) 1500 oC

(d) 2000 oC

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30. Identify open system and closed system from the following

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(a) Blood circulation and respiration in human body

(b) Fuel system and radiator in cars

(c) Air compressor and boiler

(d) Shell and tube heat exchanger and Blower

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31. Heat transfer takes place as per

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(a) Zeroth Law of Thermodynamics

(b) First Law of Thermodynamics

(c) Second Law of Thermodynamics

(d) Kirchhoff's Law

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32. Which one of the following represents the energy in storage?

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(a) Work

(b) Heat

(c) Energy

(d) Internal energy

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33. Which of the following statements is correct for "Energy"

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(a) It is a point function

(b) It is a path function

(c) It is not a conserved quantity

(d) It can be measured by thermometer

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34. The work done is constant volume process is

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(a) maximum

(b) minimum

(c) zero

(d) unpredictable

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35. In an irreversible process there is a

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(a) loss of heat

(b) no loss of heat

(c) gain of heat

(d) no gain of heat

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