1 cu-m of steam having dryness franction 0.85 at 12 ata mixes with 1.5 kg of water at 12?C at constant pressure. The dryness fraction of resulting steam would be
A.0.85
B.0.75
C.0.637
D.0.6
E.0.5
Category: Thermodynamics Mcqs
The relation of the vapour pressure to the enthalpy of vaporization is expressed in
A.Energy equation
B.Van der Waal’s equation
C.Gas equation
D.Maxwell’s equation
E.Clausius Clapeyron equation
The specific heat of a perfect gas is a function of
A.temperature only
B.temperature and pressure only
C.temperature and entropy only
D.temperature, pressure and entropy only
287 J/kg/?k is the value of
A.Gas constant in MKS units
B.Gas constant in S.I. units
C.Universal gas constant in MKS units
D.Universal gas constant in S.I. units
E.None of the above
A frictionless heat engine can be 100% efficient only if its exhaust temperature is
A.Equal to its input temperature
B.Less than its input temperature
C.0?C
D.0?K
E.?100?C
In centrifugal compressors, the ratio of outlet whirl velocity to blade velocity at outlet is known as
A.Slip factor
B.Gauge factor
C.Feedback factor
D.Velocity factor
E.Reheat factor
Highly polished surfaces of a thermosflask prevent heat by
A.Conduction
B.Convection
C.Radiation
According to Kinetic theory of gases, at absolute zero
A.Specific heat of molecules will reduce to zero
B.Mass of gas will reduce to zero
C.Volume of gas will reduce to zero
D.Pressure of gas will reduce to zero
E.Kinetic energy of gas molecules will reduce to zero
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
Heating wet steam at constant temperature is same as heating at
A.Constant pressure
B.Constant volume
C.Constant enthalpy
D.Constant entropy
E.None of the above
