Engineering :: Thermodynamics

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21.

Which of the following is an intensive property

A.	Internal energy	B.	Enthalpy
C.	Density	D.	Volume

22.

Which of the following is an extensive property?

A.	Temperature	B.	Pressure
C.	Specific volume	D.	Volume

23.

Select the correct statement

A.	Both molecular weight and total weight of a gas are intensive properties	B.	Both molecular weight and total weight of a gas are extensive properties
C.	Total weight of a gas is an extensive property molecular weight is an intensive property	D.	Total weight of a gas is an intensive property molecular weight is an extensive property

24.

Which of the following is a state function

A.	Temperature	B.	Pressure
C.	Specific volume	D.	Work

25.

The internal energy of a substance

A.	decreases with increase in temperature	B.	increases with increase in temperature
C.	ramains unaffected with change in temperature	D.	can be calculated by the relation E = mc2

26.

The internal energy of an ideal gas depends on

A.	its pressure only	B.	its volume only
C.	its temperature only	D.	the size of its molecules only

27.

The enthalpy (H) of any system is defined by the mathematical expression

A.	H = U-PV	B.	H = U + PV
C.	H = V + PU	D.	H = U + RT

28.

The enthalpy of an ideal gas

A.	depends on its temperature only	B.	depends on its pressure only
C.	may decrease while the internal energy increases	D.	depends on its volume only

29.

A system receives 13.5 J of heat and at the same time work is transferred to the surroundings. Which of the following amount is possible ?

A.	13.5 J	B.	20.0 J
C.	1 J	D.	14.5 J

30.

In a certain process the heat flow into a system is 25 Btu. What is the change in internal energy if the work done by the system in the process is 55 Btu ?

A.	30 Btu	B.	80 Btu
C.	30 Btu	D.	80 Btu