The critical temperature of carbondioside is 31.1?C. If the room temperature is 34.7?C, then carbondioxide at room temperature is
A.gas
B.wet vapour
C.vapour
D.superheated vapour
Category: Thermodynamics Mcqs
A system comprising a single phase is called a
A.Closed system
B.Open system
C.Isolated system
D.Homogeneous system
E.Heterogeneous system
The process that follows the equation pvn = constant, is called
A.Constant volume process
B.Constant pressure process
C.Constant temperature process
D.Adiabatic process
E.Polytropic process
The dew point temperature of humid air is
A.always higher than the wet bulb temperature
B.never lower than the wet bulb temperature
C.the temperature of air obtained on cooling it till saturation at constant pressure
D.the temperature of air obtained on cooling it till saturation at constant volume
A carnot cycle engine operating between temperature range of 50?C and 100?C will have the efficiency of nearly
A.50%
B.40%
C.26.80%
D.13.40%
Most of gases exhibit drop in temperature upon expansion. However, this may not be true in case of
A.Carbondioxide
B.Oxygen
C.Hydrogen
D.Helium
In the polytropic process equation pvn Constant, if n = 0 the process is termed as
A.Constant volume
B.Constant pressure
C.Constant temperature
D.Adiabatic
E.Isothermal
In which of the following energy conversion takes place at ambient temperature?
A.Magnetohydrodynamic conversion
B.Thermionic generator
C.Battery producing electrical energy
D.Solar radiation
An adlabatic wall permits
A.Conduction heat flow only
B.Convective heat flow only
C.Radiation heat flow only
D.Heat exchange by all the three modes of heat transfer
E.No heat exchange
Internal energy of a perfect gas depends on
A.Temperature, specific heats and pressure
B.Temperature, specific heats and enthalpy
C.Temperature, specific heats and entropy
D.Temperature and specific heats
E.Temperature only
