Top 550+ Solved Thermal Engineering 2 MCQ Questions Answer
Q. Pressure ratios below 20 are used in _____________ engines.
a. steam turbine
b. aero derivative engines
c. heavy frame engines
d. none of the mentioned
Q. Aeroderivative engines have pressure ratios ___________
a. greater than 30
b. lesser than 30 and greater than 20
c. greater than 50
d. none of the mentioned
Q. Aeroderivative engines are used where ____________ power units are required.
a. larger
b. smaller
c. optimum
d. none of the mentioned
Q. Gas turbines operate at pressures ________ than critical pressure ratio.
a. higher
b. lesser
c. does not depend on pressure ratio
d. none of the mentioned
Q. Critical pressure ratio is ratios of pressures at _________ discharge.
a. minimum
b. none of the mentioned
c. optimum
d. maximum
Q. Coefficient of velocity of nozzle is _______________
a. theoretical velocity/actual velocity
b. actual velocity/theoretical velocity
c. it is an experimental value
d. none of the mentioned
Q. Coefficient of discharge of Nozzle is _______
a. cd = cc/cv
b. cd = cc*cv
c. cd = cv/cc
d. none of the mentioned
Q. Coefficient of contraction is the__________
a. ratio of actual cross sectional area to geometric cross sectional area
b. ratio of geometric cross sectional area to actual cross sectional area
c. ratio of pressure exerted to cross sectional area
d. none of the mentioned
Q. Pressure loss occurs in nozzle due to __________
a. due to viscous force
b. when fluid flows from convergent to divergent
c. frictional forces
d. none of the mentioned
Q. Head loss in nozzles occurs due to __________
a. pipes head loss
b. pressure loss
c. friction loss
d. none of the mentioned
Q. At vena contracta the velocity is _________ and pressure is ___________
a. lowest, highest
b. highest, highest
c. highest, lowest
d. none of the mentioned
Q. When flow converts from supersonic to subsonic then __________ is produced.
a. shock wave
b. pressure drop
c. shock wave & pressure drop
d. none of the mentioned
Q. Shock wave causes instantaneous _________ to the subsonic speed.
a. increase
b. decrease
c. remains constant
d. none of the mentioned
Q. Mixture of steam and liquid water is called as _________
a. dry steam
b. wet steam
c. saturated steam
d. none of the mentioned
Q. Supersaturated steam is also called as _________
a. saturated steam
b. single phase mix
c. two phase mix
d. none of the mentioned