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A.reversible
B.irreversible
C.reversible or irreversible depending upon the gases involved
In a boiler a fusible plug is located at the
A.bottom of fire tubes
B.bottom of drum
C.top of superheater
D.inlet to stop valve
For a closed system, the difference between the heat added to the system and the work done by the system is equal to the change in
A.enthalpy
B.entropy
C.temperature
D.internal energy
Which of the following valve is installed between the boiler and the feed pump?
A.Steam stop valve
B.Flow of cock
C.Feed check valve
D.Throttle valve
A jar contains a mixture of oxygen and hydrogen gas in the ratio 1 : 5. The ratio of mean knetic energies of hydrogen and oxygen molecules is
A.1 ; 1
B.1 ; 4
C.1 ; 5
D.1 ; 16
Three Carnot engines A, B and C having source temperature of 750?K, 700?K and 650?K have sink temperatures respectively 400?k, 350?k and 300?k. Which engine is the least efficient?
A.Engine A
B.Engine B
C.Engine C
D.All being Carnot engine have identical efficiencies
In Porous plug experiment the change in temperature of a gas depends upon
A.its molecular weight
B.its specific heat
C.pressure gradient on either side
D.All of the above