41
During throttling process
Answer: all of the above
Questions
44
A perpetual motion machine is
Answer: a hypothetical machine whose opera-tion would violate the laws of thermodynamics
46
The efficiency of a Carnot engine depends on
Answer: temperatures of source and sink
49
The ideal efficiency of a Brayton cycle with regeneration, with increase in pressure ratio will
Answer: decrease
50
If value of n is infinitely large in a polytropic process pV” = C, then the process is known as constant
Answer: volume
51
The index of compression n tends to reach ratio of specific heats y when
Answer: process is isentropic and specific heat does not change with temperature
52
Change in enthalpy of a system is the heat supplied at
Answer: constant pressure
54
A heat exchange process in which the product of pressure and volume remains constant is known as
Answer: hyperbolic process
55
In an isothermal process, the internal energy of gas molecules
Answer: remains constant
56
The basis for measuring thermodynamic property of temperature is given by
Answer: zeroth law of thermodynamics
58
For which of the following substances, the gas laws can be used with minimum error
Answer: superheated steam
59
In a non-flow reversible process for which p = (- 3V+ 15) x 105N/m2,V changes from 1 m to 2 m3. The work done will be about
Answer: 10 xlO5 joules
60
The value of the product of molecular weight and the gas characteristic constant for all the gases in M.K.S. unit is
Answer: 848kgfm/mol°K
