Change in enthalpy in a closed system is equal to heat transferred if the reversible process takes place at constant________________?
(A) pressure
(B) temperature
(C) volume
(D) internal energy
(D) entropy
Energy can neither be created nor destroyed but can be converted from one form to other is inferred from_________________?
(A) zeroth low of thermodynamic
(B) first law of thermodynamics
(C) second law to thermodynamics
(D) basic law of thermodynamics
(D) claussius statement
Entropy change depends on___________________?
(A) heat transfer
(B) mass transfer
(C) change of temperature
(D) thermodynamic state
(D) change of pressure and volume
A gas is compressed in a cylinder by a movable piston to a volume one-half its original volume. During the process 300 kJ heat left the gas and internal energy remained same. The work done on gas in Nm will be___________________?
(A) 300 Nm
(B) 300,000 Nm
(C) 30 Nm
(D) 3000 Nm
(D) 30,000 Nm
Minimum work in compressor is possible when the value of adiabatic index n is equal to_________________?
(A) 0.75
(B) 1
(C) 1.27
(D) 1.35
(D) 2
Barometric pressure is equal to_____________________?
(A) 760 mm Hg
(B) zero mm Hg
(C) 735.6 mm Hg
(D) 1 mm Hg
(D) 100mm Hg
Calorie is a measure of
(A) specific heat
(B) quantity of heat
(C) thermal capacity
(D) entropy
(D) work
A sudden fall in the barometer reading is a sign of approaching________________?
(A) fine weather
(B) rains
(C) storm
(D) cold wave
(D) hot wave
During throttling process___________________?
(A) heat exchange does not take place
(B) no work is done by expanding steam
(C) there is no change of internal energy of steam
(D) all of the above
(D) entropy decreases
Compressed air coming out from a punctured football___________________?
(A) becomes hotter
(B) becomes cooler1
(C) remains at the same temperature
(D) may become hotter or cooler depend-ing upon the humidity of the surround¬ing air
(D) attains atmospheric temperature