A cycle consisting of two constant pressure and two isentropic processes is known as
A. Carnot cycle
B. Stirling cycle
C. Otto cycle
D. None of these
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A cycle consisting of two adiabatic and two constant pressure processes is known as
A. Otto cycle
B. Ericsson cycle
C. Joule cycle
D. Stirling cycle
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A cycle consisting of one constant pressure, one constant volume and two isentropic processes is known as
A. Otto cycle
B. Stirling cycle
C. Carnot cycle
D. Diesel cycle
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A process, in which the temperature of the working substance remains constant during its expansion or compression, is called
A. Adiabatic process
B. Isothermal process
C. Hyperbolic process
D. Polytropic process
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The ideal efficiency of a Brayton cycle without regeneration, with increase in pressure ratio will
A. Increase
B. Decrease
C. Remain unchanged
D. Increase/decrease depending on application
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The ideal efficiency of a Brayton cycle with regeneration, with increase in pressure ratio will
A. Increase
B. Decrease
C. Remain unchanged
D. Increase/decrease depending on application
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Absolute zero pressure will occur
A. At sea level
B. When molecular momentum of the system becomes zero
C. Under vacuum conditions
D. At a temperature of 273°K
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In a free expansion process
A. Work done is zero
B. Heat transfer is zero
C. Both (A) and (B) above
D. Work done is zero but heat increases
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The ratio of two specific heats of air is equal to
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One kg of carbon produces ________ kg of carbon dioxide.
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One kg of carbon produces __________ kg of carbon dioxide.
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If a certain amount of dry ice is mixed with same amount of water at 80°C, the final temperature of mixture will be
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The air standard efficiency of an Otto cycle is given by (where r = Compression ratio and γ = Ratio of specific heats)
A. 1 − r γ − 1
B. 1 + r γ − 1
C. 1 − r γ − 1 1
D. 1 + r γ − 1 1
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Work-done during adiabatic expansion is given by (where p1 , v1 , T1 = Pressure, volume and temperature for the initial condition of gas, p2 , v2 , T2 = Corresponding values for the final condition of gas, R = Gas constant and γ = Ratio of specific heats)
A. γ − 1 p 1 v 1 − p 2 v 2
B. γ − 1 mR ( T 1 − T 2 )
C. γ − 1 mR T 1 ( 1 − p 1 v 1 p 2 v 2 )
D. All of these
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According to First law of thermodynamics,
A. Total internal energy of a system during a process remains constant
B. Total energy of a system remains constant
C. Work-done by a system is equal to the heat transferred by the system
D. Internal energy, enthalpy and entropy during a process remain constant
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According to Kelvin-Planck’s statement of second law of thermodynamics,
A. It is possible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
B. It is impossible to construct a device which operates in a cyclic process and produces no effect other than the transfer of heat from a cold body to a hot body
C. It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
D. None of the above
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According to Kelvin-Planck's statement of second law of thermodynamics,
A. It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
B. It is possible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
C. It is impossible to construct a device which operates in a cyclic process and produces no effect other than the transfer of heat from a cold body to a hot body
D. None of the above
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The heat and work are mutually convertible. This statement is called __________ law of thermodynamics.
A. Zeroth
B. First
C. Second
D. Third
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Which of the following statement is correct according to Clausis statement of second law of thermodynamics?
A. It is possible to transfer heat from a body at a lower temperature to a body at a higher temperature.
B. It is impossible to transfer heat from a body at a lower temperature to a body at a higher temperature, without the aid of an external source.
C. It is possible to transfer heat from a body at a lower temperature to a body at a higher temperature by using refrigeration cycle.
D. None of the above
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Which of the following is the correct statement of the second law of thermodynamics?
A. There is a definite amount of mechanical energy, which can be obtained from a given quantity of heat energy
B. It is impossible to transfer heat from a body at a lower temperature to a higher temperature, without the aid of an external source
C. It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
D. All of the above
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