The ratio of specific heat at constant pressure (cp) and specific heat at constant volume (cv) is
A. Equal to one
B. Less than one
C. Greater than one
D. None of these
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The principal constituents of a fuel are
A. Carbon and hydrogen
B. Oxygen and hydrogen
C. Sulphur and oxygen
D. Sulphur and hydrogen
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The compression ratio is the ratio of
A. Total volume to swept volume
B. Swept volume to clearance volume
C. Swept volume to total volume
D. Total volume to clearance volume
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The gas constant (R) is equal to the __________ of two specific heats.
A. Product
B. Sum
C. Difference
D. Ratio
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When the expansion or compression takes place according to the law pvn = C, the process is known as
A. Isothermal process
B. Adiabatic process
C. Hyperbolic process
D. Polytropic process
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If a gas vapour is allowed to expand through a very minute aperture, then such a process is known as
A. Free expansion
B. Hyperbolic expansion
C. Adiabatic expansion
D. Throttling
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In an irreversible process, there is a
A. No loss of heat
B. Loss of heat
C. Gain of heat
D. No gain of heat
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Second law of thermodynamics defines
A. Heat
B. Work
C. Internal energy
D. Entropy
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Which of the following variables controls the physical properties of a perfect gas?
A. Pressure
B. Temperature
C. Volume
D. All of the above
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Which of the following laws is applicable for the behaviour of a perfect gas?
A. Boyle's law
B. Charle's law
C. Gay Lussac's law
D. All of the above
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Which of the following process can be made reversible with the help of a regenerator?
A. Constant pressure process
B. Constant volume process
C. Constant pvn process
D. All of these
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The value of 1 mm of Hg is equal to
A. 1.333 N/m2
B. 13.33 N/m2
C. 133.3 N/m2
D. 1333 N/m2
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The efficiency of Joule cycle is
A. Less than Carnot cycle
B. Equal to Carnot cycle
C. Greater than Carnot cycle
D. None of these
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A mixture of gas expands from 0.03 m3 to 0.06 m3 at a constant pressure of 1 MPa and absorbs 84 kJ of heat during the process. The change in internal energy of the mixture is
A. 30 kJ
B. 84 kJ
C. 54 kJ
D. 114 kJ
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Zeroth law of thermodynamics
A. Deals with conversion of mass and energy
B. Deals with reversibility and irreversibility of process
C. States that if two systems are both in equilibrium with a third system, they are in thermal equilibrium with each other
D. Deals with heat engines
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First law of thermodynamics
A. Enables to determine change in internal energy of the system
B. Does not enable to determine change in entropy
C. Provides relationship between heat, work and internal energy
D. All of the above
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According to first law of thermodynamics
A. Work done by a system is equal to heat transferred by the system
B. Total internal energy of a system during a process remains constant
C. Internal energy, enthalpy and entropy during a process remain constant
D. Total energy of a system remains constant
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According to Clausius statement of second law of thermodynamics
A. Heat can't be transferred from low temperature source to high temperature source
B. Heat can be transferred for low temperature to high temperature source by using refrigeration cycle
C. Heat can be transferred from low temperature to high temperature source if COP of process is more than unity
D. Heat can't be transferred from low temperature to high temperature source without the aid of external energy
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The statement that molecular weights of all gases occupy the same volume is known as
A. Avogadro's hypothesis
B. Dalton's law
C. Gas law
D. Law of thermodynamics
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In a no flow reversible process for which p = (-3V + 15) × 105 N/m2 , V changes from 1 m3 to 2 m3 . The work done will be about
A. 100 × 105 joules
B. 1 × 105 joules
C. 10 × 105 joules
D. 10 × 105 kilo joules
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