Engineering :: Thermodynamics

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211.

Balanced draft incorporates

A.	Forced draft	B.	Induced draft
C.	Forced and induced draft	D.	Chimney draft only

212.

During an adiabatic process the change in entropy is

213.

Entropy of the universe tends to

A.	A minimum	B.	Zero
C.	A maximum	D.	No particular value as it remains constant

214.

In a reversible cycle, the entropy of the system

A.	Increases	B.	Decreases
C.	Does not change	D.	First increases and then decreases
E.	Depends on the properties of working substance

215.

A frictionless heat engine can be 100% efficient only if its exhaust temperature is

A.	Equal to its input temperature	B.	Less than its input temperature
C.	0?C	D.	0?K
E.	?100?C

216.

Joule Thomson coefficient for an ideal gas having equation pv = RT is

A.	Unity	B.	0.5
C.	Zero

217.

Which of the following gas has the highest values for the adiabatic index?

218.

The percentage of carbondioxide in the exhaust gases from a diesel engine cannot exceed

219.

Which of the following statement is incorrect?

A.	Total heat of steam is less than the total weight of dry and super saturated steam	B.	Total heat of super heated steam is more than the total heat of wet steam
C.	Latent heat of steam at critical pressure is zero	D.	Latent heat per kg of steam decreases as the pressure of steam increases
E.	None of the above

220.

Which of the following relation is not valid for throttling process?

A.	Enthalpy before expansion = Enthalpy after expansion	B.	Pressure before expansion = pressure after expansion
C.	External work done = Zero	D.	Mass before expansion = mass after expansion
E.	None of the above