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At critical point, i.e. p=225.65 kg/cm2, the latent enthalpy of vaporization is

A.	maximum	B.	minimum
C.	zero	D.	depends on temperature also

Cochran boiler is a

A.	horizontal fire-tube boiler	B.	horizontal water-tube boiler
C.	veritcal water-tube boiler	D.	vertical fire tube boiler

During polytropic process

A.	heat transfer takes place across cylinder walls	B.	work is done
C.	steam may be wet, dry or superheated after expansion	D.	all of the above

10.

Efficiency of a thermal cycle increases by

A.	regeneration	B.	reheating of steam
C.	both (a) and (b)	D.	cooling of steam

11.

Efficiency of rankine cycle can be increased by

A.	decreasing initial steam pressure and temperature	B.	increasing exhaust pressure
C.	decreasing exhaust pressure	D.	increasing the expansion ratio

12.

Equivalent evaporation is the amount of water evaporated in a boiler from and at

A.	0°C	B.	100°C
C.	saturation temperature at given pres¬sure	D.	room temperature

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