A perfect black body is
A.Black in colour
B.One which absorbs total radiant energy
C.One which does not reflect the radiant energy
D.One through which radiant energy is not transmitted
E.One which absorbs all radiant energy at all wavelengths
Category: Thermodynamics Mcqs
In case of six stage compression of air for minimum work conditions
A.Pressure rise per stage will be equal
B.Work done in successive stages will be in geometrical progression
C.Cylinder volumes will be identical
D.Piston diameters will be identical
E.Temperature rise in the cylinders will be the same
The internal energy of a substance depdnds on
A.Temperature
B.Pressure
C.Volume
D.Entropy
E.Velocity
For any reversible process, the change in entropy of the system and surroundings is
A.Zero
B.Unity
C.Negative
D.Positive
E.Infinite
A law which is applicable only to ideal vapours and liquids, that equates the equilibrium partial pressures of a solution component in the coexisting phases, is known as
A.Henry’s law
B.Roult’s law
C.Joule’s law
D.Maxwell’s equation
E.Fick’s law
The fact that the product of pressure and volume of a fixed amount of gas is of approximately constant value is known as
A.Charle’s law
B.Gay Lussac’s law
C.Dalton’s law
D.Lewis law
E.None of these
A barN is
A.A unit of area
B.A unit of length
C.A unit of time
D.A unit of mass
E.None of the above
In case of axial flow compressors for minimum fluid driction and blade tip clearance losses, the blades of an axial flow compressor are disigned for
A.90% reaction
B.75% reaction
C.60% reaction
D.53% reaction
E.Less than 50% reaction
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
The rate of discharge through the nozzle
A.remains same
B.decreases
C.increases
