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WorksheetsThermodynamics relation and Avaliability
Total questions: 16
Worksheet time: 9mins
A gas having a negative Joule-Thompson coefficient , when throttled, will
(A) Become cooler
(B) Become warmer
(C) Remain at the same temperature
(D) Either be cooler or warmer depending on the type of gas
A positive value of Joule-Thompson coefficient of a fluid means
(A) Temperature drops during throttling
(B) Temperature remains constant during throttling
(C) Temperature rises during throttling
(D) None of these
Considering the relationship Tds=dU+pdV between the entropy (S), internal energy (U), pressure (p), temperature (T) and volume (V), which of the statement is correct.
(A) It is applicable only for a reversible process
(B) For an irreversible process TdSdU+pdV
(C) It is valid only for an ideal gas
(D) It is equivalent to 1st law, for a reversible process
A steel billet of 2000 kg mass is to be cooled from 1250 K to 450 K. The heat released during this process is to be used as a source of energy. The ambient temperature is 303 K and specific heat of steel is 0.5 kJ/kg K. The available energy of the billet is
(A) 490.44 MJ
(B) 30.95 MJ
(C) 10.35 MJ
(D) 0.10 MJ
Which combination of the following statement is correct?
P : A gas cools upon expansion only when its Joule-Thompson co-efficient is positive in the temperature range of expansion.
Q : For a system undergoing a process, its entropy remains constant only when the process is reversible.
R : The work done by a closed system in an adiabatic process is a point function.
S : A liquid expands upon freezing when the slope of its fusion curve on pressure-temperature diagram is negative..
(A) R and S
(B) P and Q
(C) Q, R and S
(D) P, Q and R
Consider the following two processes;
I. A heat source at 1200 K loses 2500kJ of heat to a sink at 800 K
II. A heat source at 800 K loses 2000 kJ of heat to a sink at 500 K
which of the following statement is true?
(A) Process I is more irreversible than process II
(B) Process II is more irreversible than process I
(C) Irreversibility associated in both the processes are equal
(D) Both the process are reversible
Availability of a system at any state is given as
(a)
The maximum theoretical work when system interact to surrounding is called as
(a)
Joule Thomson coff. for ideal gas is
1
0
less than 0
more than 0
The symbol of Helmholtz free energy is_________
a) A
b) H
c) B
d) E
Which among the following is the formula for Helmholtz free energy?
a) U+TS
b) U+TV
c) U-TS
d) UTV
Which of the following is not a Maxwell equation?
a) (∂T/∂V) = -(∂p/∂S)
b) (∂T/∂p) = -(∂V/∂S)
c) (∂p/∂T) = (∂S/∂V)
d) (∂V/∂T) = -(∂S/∂p)
The condition for exact differential is
a) (∂N/∂y) = (∂M/∂x)
b) (∂M/∂y) = (∂N/∂x)
c) (∂M/∂y) = -(∂N/∂x)
d) all of the mentioned
The first TdS equation is
a) TdS=Cv*dT + T(∂T/∂p)dV
b) TdS=Cv*dT – T(∂p/∂T)dV
c) TdS=Cv*dT + T(∂p/∂T)dV
d) TdS=Cv*dT – T(∂T/∂p)dV
The second TdS equation is
a) TdS=Cp*dT + T(∂V/∂T)dp
b) TdS=Cp*dT – T(∂V/∂T)dp
c) TdS=Cp*dT + T(∂T/∂V)dp
d) TdS=Cp*dT – T(∂T/∂V)dp
Which of the following is true?
a) (∂p/∂V)*(∂V/∂T)*(∂T/∂p)= infinity
b) (∂p/∂V)*(∂V/∂T)*(∂T/∂p)= 0
c) (∂p/∂V)*(∂V/∂T)*(∂T/∂p)= 1
d) (∂p/∂V)*(∂V/∂T)*(∂T/∂p)= -1
