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Engineering :: Thermodynamics

171.  Which of the following turbines cannot be set below the maximum tail race level
A. Pelton B. Francis
C. Kaplan D. Propeller
172.  If during a process, the entropy of the isolated system increases, the process is
A. Adiabatic B. Isothermal
C. Reversible D. Irreversible
E. Ideal    
173.  Isentropic flow is
A. Irreversible adiabatic flow B. Ideal fluid flow
C. Perfect gas flow D. Frictionless reversible flow
E. Change in entropy is zero    
174.  The unit of Universal Gas constant is
A. erg/?K B. kcal/?K
C. Dynes/?K D. W/m?K
E. It is dimensionless    
175.  Thermodynamic equilibrium is completely defined by the specifications of
A. Internal energy B. Generalized displacement
C. All the above together D. None of the above
176.  In which case the work done per kg of air compressed from 1.05 ata, 15?C to 6.3 ata is minimum
A. Adiabatic B. Polytropic with index n = 1.3
C. Polytropic with index n = 1.35 D. Polytropic with index n = 1.40
E. Isothermal    
177.  Draught ensures supply of
A. Feed water B. Air for combustion
C. Superheated steam D. Coad to the boiler
178.  Exhaust gases from a engine possess
A. Potential energy B. Kinetic energy
C. Chemical energy D. Solar energy
E. Stored energy    
179.  The extension and compression of a helical spring is an example of
A. Thermodynamic cycle B. Adiabatic process
C. Isothermal process D. Irreversible process
E. Reversible process    
180.  Diffusion is
A. Mixing of two portions of fluid B. Mixing of a gas in two containers at different pressures
C. Mixing of two portions of a fluid at different temperatures D. Mixing of unlike fluids
E. None of the above    

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