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Mechanical Engineering Objective Questions { Thermodynamics }



92. 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

93. In an isothermal process, the internal energy
A.Increases
B.Decreases
C.Remains constant
D.First increases and then decreases

94. Change in enthalpy in a closed system is equal to heat transferred if the reversible process takes place at constant
A.Pressure
B.Temperature
C.Volume
D.Internal energy

95. Change in internal energy in a closed system is equal to heat transferred if the reversible process takes place at constant
A.Pressure
B.Temperature
C.Volume
D.Internal energy

96. Total heat of a substance is also known as
A.Internal energy
B.Entropy
C.Thermal capacity
D.Enthalpy

97. First law of thermodynamics
A.Enables to determine change in internal energy of the system
B.Does not help to predict whether the system will or not undergo a change
C.Provides relationship between heat, work and internal energy
D.All of the above

98. According to first law of thermodynamics
A.Mass and energy are mutually convertible
B.Carnot engine is most efficient
C.Heat and work are mutually convertible
D.Mass and light are mutually convertible

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