Engineering :: Thermodynamics

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91.

The amount of heat evolved or absorbed when one mole of any compound is formed from its elements is called

A.	heat of transition	B.	heat of combustion
C.	heat of formation	D.	heat of hydration

92.

The ?H is constant in a chemical change and independent upon the path and time taken. This is known as

A.	Hess law of constant heat summation	B.	Lavoisier and Laplace law
C.	Vant Hoffs law	D.	Gibbs law

93.

Lenzs law is a consequence of the law of conservation of

A.	mass	B.	energy
C.	linear momentum	D.	angular momentum

94.

A reversible process requires that

A.	there be no viscous or friction in the system	B.	heat transfer occurs from system to surroundings only
C.	pressure of the system and surroundings be equal	D.	temperature of the system and surroundings be equal

95.

For reversible isobaric process the exponent n in the relation PVn = constant has the value of where ? = ratio of specific heats

A.	1	B.	0
C.	?	D.	?

96.

For a reversible isothermal process the exponent n in the relation PVn = constant has the value of where ? = ratio of specific heats

A.	0	B.	?
C.	1	D.	?

97.

For an isentropic process the exponent n in the relation PVn = constant has the value of where ? = ratio of specific heats

A.	0	B.	1
C.	?	D.	?

98.

The relation PVY = constant holds only for those processes which are

A.	isentropic	B.	irreversible adiabatic
C.	reversible polytropic	D.	all of these asnwers

99.

An isentropic flow is one which is

A.	adiabatic and reversible	B.	adiabatic and irreversible
C.	isothermal and reversible	D.	isothermal and irreversible

100.

In reversible adiabatic processes

A.	pressure remains constant	B.	enthalpy remains constant
C.	temperature remains constant	D.	heat transfer between system and its surroundings does not occur.