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The Euler’s theory of columns is valid when the

i. Slenderness ratio is greater than or equal to f= E
6५
ii. Crushing stress is > buckling stress
iii. The column is short
iv. Crushing stress is < buckling stress
A) iand ii B) iand iv C) i, ii and iii D) iii and iv
Change in enthalpy in a closed system is equal to heat transferred, if the reversible
process takes place at constant
A) temperature B) internalenergy C) entropy D) pressure

An engine operates between temperatures limits of 900 K and T, and another engine
operates between T. and 400 K. For both engines to be equally efficient, T, should
be equal to

A) 650K B) 600K C) 625K 0) 700 >

The throttling of certain gases may be used for getting the refrigerating effect. The
value of Joule coefficient (11) for such a process is

^) ॥= 0 2) ॥ =1 ©) ॥>1 0) ॥<0

The thermodynamic property which is evaluated with the help of Maxwells equations
from the data of other measurable properties of a system is
A) entropy B) enthalpy C) specific heat D) latent heat

Which one of the following gases will have the maximum value of characteristic gas
constant ?

A) oxygen B) nitrogen C) carbon dioxide D) sulfur dioxide

For a heat engine operating on Carnot cycle, the work output is 25% of the heat
rejected to the sink. The thermal efficiency for the engine would be
A) 10% B) 50% C) 30% D) 20%

In Carnot cycle, the addition of heat takes at
A) constant pressure

B)

C) constant temperature

D) partly at constant pressure and partly at constant volume

constant volume