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This set of Thermal Engineering 2 Multiple Choice Questions & Answers (MCQs) focuses on Thermal Engineering II Set 7
Q1 | Coefficient of velocity of nozzle is _______________
- theoretical velocity/actual velocity
- actual velocity/theoretical velocity
- it is an experimental value
- none of the mentioned
Q2 | Coefficient of discharge of Nozzle is _______
- cd = cc/cv
- cd = cc*cv
- cd = cv/cc
- none of the mentioned
Q3 | Coefficient of contraction is the__________
- ratio of actual cross sectional area to geometric cross sectional area
- ratio of geometric cross sectional area to actual cross sectional area
- ratio of pressure exerted to cross sectional area
- none of the mentioned
Q4 | Pressure loss occurs in nozzle due to __________
- due to viscous force
- when fluid flows from convergent to divergent
- frictional forces
- none of the mentioned
Q5 | Head loss in nozzles occurs due to __________
- pipes head loss
- pressure loss
- friction loss
- none of the mentioned
Q6 | At vena contracta the velocity is _________ and pressure is ___________
- lowest, highest
- highest, highest
- highest, lowest
- none of the mentioned
Q7 | When flow converts from supersonic to subsonic then __________ is produced.
- shock wave
- pressure drop
- shock wave & pressure drop
- none of the mentioned
Q8 | Shock wave causes instantaneous _________ to the subsonic speed.
- increase
- decrease
- remains constant
- none of the mentioned
Q9 | Mixture of steam and liquid water is called as _________
- dry steam
- wet steam
- saturated steam
- none of the mentioned
Q10 | Supersaturated steam is also called as _________
- saturated steam
- single phase mix
- two phase mix
- none of the mentioned
Q11 | If heat is added to the wet steam temperature _________
- raises immediately
- decreases immediately
- raises after sometime
- none of the mentioned
Q12 | After steam bubbles break the water surface, they carry water droplets this is called as ________
- entrainment
- capillarity
- reverse capillarity
- none of the mentioned
Q13 | Entrainment happens at __________
- liquid surface having contact with atmosphere
- outlet of the boiler
- inlet of the boiler
- none of the mentioned
Q14 | Resistance of water dominating the steam is called as _______
- hydraulic water hammer
- erosion
- contamination
- none of the mentioned
Q15 | When steam is transported dryness fraction _________
- increases
- decreases
- remains constant
- none of the mentioned
Q16 | Coefficient of discharge is the __________ of Actual discharge to the theoretical discharge.
- ratio
- product
- sum
- none
Q17 | Coefficient of discharge is used to measure ___________
- none of the mentioned
- pressure exerted by the nozzle on the fluid
- flow rate allowed by the nozzle
- resistance offered by the nozzle
Q18 | Unit of flow resistance is _________
- n/m2
- m2/n
- kn/kg
- no unit
Q19 | Coefficient of discharge is the ____________
- product of coefficient of velocity and coefficient of contraction
- arithmetic sum of coefficient of velocity and coefficient of contraction
- ratio of coefficient of velocity and coefficient of contraction
- none of the mentioned
Q20 | Coefficient of discharge is _____________
- directly proportional to coefficient of discharge
- inversely proportional to square of the coefficient of discharge
- inversely proportional to coefficient of discharge
- directly proportional to square of coefficient of discharge
Q21 | For sharp edge orifice, coefficient of discharge lies between ___________
- 0.61 – 0.64
- 0.87 – 0.89
- 0.50 – 0.61
- none of the mentioned
Q22 | In the equation Cd=1/K(0.5) what does K mean ?
- pressure drop inside the nozzle
- mass flow rate
- flow resistance
- none of the mentioned
Q23 | A turbine having alternate blades and nozzles is called as _______________
- impulse turbine
- reaction turbine
- impulse & reaction turbine
- none of the mentioned
Q24 | Multi stage arrangement of turbines is called as __________
- impulse turbine
- reaction turbine
- compounding
- none of the mentioned
Q25 | Compounding __________ efficiency at low speed.
- decrease
- increase
- maximizes
- none of the mentioned