MCQ on Thermal Engineering & Heat Transfer

Multiple Choice Questions on Thermal Engineering & Heat Transfer

The work of steam nozzle is
(a) convert heat energy of steam into kinetic energy
(b) convert kinetic energy of steam into heat energy
(c) convert heat energy of steam into mechanical energy
(d) convert heat energy of steam into potential energy

The rate of discharge of steam nozzle at critical pressure ratio is
(a) Minimum
(b) Maximum
(c) Zero
(d) Uncertain

The corss section of nozzle is
(a) Circular
(b) Elliptical
(c) Square
(d) All the above

In reaction turbines heat drop of steam takes place
(a) only in fixed blade
(b) only in moving blade
(c) in both fixed & moving blade
(d) in any of the fixed blade and moving blade

The degree of reaction of Parson’s turbine is
(a) 0.8
(b) 0
(c) 1
(d) 0.5

The meaning of the term bleeding of steam in turbines is
(a) leakage of steam
(b) steam doing useful work
(c) steam extracted for preheating of feed water
(d) None of the above

The cooling water in jet condensers
(a) make direct contact with exit steam
(b) does not make direct contact with exit steam
(c) all the above
(d) None of the above

The surface condensers as compared to jet condensers are
(a) less efficient
(b) equally efficient
(c) more efficient
(d) None of the above

Vacuum efficiency of a condenser is
(a) Maximum attained vacuum/Actual vacuum
(b) Actual vacuum/ Minimum attained vacuum
(c) Actual vacuum/ Maximum attained vacuum
(d) None of the above