MCQ
2101. An isolated system is one in which-
Mass does not cross boundaries of the system, though energy may do so
Neither mass nor energy crosses the boundaries of the system
Both energy and mass cross the boundaries of the system
Mass crosses the boundary but not the energy
2102. If a gas vapour is allowed to expand through a very minute aperture, then such a process is known as-
Free expansion
Hyperbolic expansion
Adiabatic expansion
Throttling
2103. The same volume of all gases would represent their-
Densities
Specific weights
Molecular weights
Gas characteristic constants
2104. pick up incorrect statement-the
lithium bromide used in vapour absorption cycle is nonvolatile
lithium bromide plant can't operate below 0 °C
a separator is used in lithium bromide plant to remove the unwanted water vapour by condensing
concentration of solution coming out of lithium bromide generator is more in comparison to that entering the generator
2105. Work done in an adiabatic process between a given pair of end states depends on-
The end states only
particular adiabatic process
The value of index n
The value of heatt ransferred
2106. Air conditioning means--
heating
cooling
dehumidifying
all of these
2107. The value of n = 1 in the polytropic process indicates it to be-
Reversible process
Isothermal process
Adiabatic process
Irreversible process
2108. Clapeyron equation is applicable for registration at—
saturation point of vapour
saturation point of liquid
sublimation temperature
triple point
2109. Which of the following parameters is constant for a mole for most of the gases at a given temperature and pressure?
Enthalpy
Volume
Mass
Entropy
2110. An ideal gas as compared to a real gas at very high pressure occupies-
More volume
Less volume
Same volume
Unpredictable behaviour
2111. A heat exchange process in which the product of pressure and volume Remains constant is known as-
Heat exchange process
Throttling process
Isentropic process
Hyperbolic process
2112. Ammonia is-.
non-toxic
non-inflammable
toxic and non-inflammable
highly toxic and inflammable
2113. To convert volumetric analysis to gravimetric analysis, the relative volume of each constituent of the flue gases is-
Divided by its molecular weight
Multiplied by its molecular weight
Multiplied by its density
Multiplied by its specific weight
2114. Mass flow ratio of NH3 in comparison to Freon-12 for same refrigeration load and same temperature limits is of the order of-
1:1
9:1
1:9
1:3
2115. The specific heat of air increases with increase in-
Temperature
Pressure
Both pressure and temperature
Variation of its constituents
2116. The lower horizontal line of the refrigeration cycle plotted on pressure-enthalpy-diagram represents--
condensation of the refrigerant vapour
evaporation of the refrigerant liquid
compression of the refrigerant vapour
meltering of the refrigerant liquid
2117. The extensive properties of a system,-
Are independent of the mass of the system
Depend upon temperature of the system
Depend upon the mass of the system
None of the above
2118. Freon group of refrigerants are-.
inflammable
toxic
non-inflammable and toxic
non-toxic and non-inflammable
2119. Change in enthalpy of a system is the heat supplied at-
Constant pressure
Constant temperature
Constant volume
Constant entropy
2120. When a gas is heated change takes place in.
During compression, the volume (V) of a ga decreases. When this happens, the pressure (P) of the gas increases if the number of moles (n) of gas remains constant. If you keep the pressure constant, reducing the temperature (T) also causes the gas to compress .
Pressure
Volume
Temperature
All of these