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Worksheetsthermal engineering II
Total questions: 10
Worksheet time: 3mins
1.The critical pressure ratio for initially dry saturated steam is.......
A.0.528
A.0.546
C.0.577
D.0.582
2.Nozzle efficiency is described as.......
A. Isentropic heat drop/useful heat drop
B. useful heat drop/isentropic heat drop
C. saturation temperature/super saturation temperature
D. super saturation temperature/saturation temperature
3.The steam leaves the nozzle at a.........
A.High pressure and low velocity
B.High-pressure and high velocity
C.Low pressure and low velocity
D.Low pressure and high velocity
4.The flow of steam in a nozzle is subsonic at......
A.Throat
B.Divergent portion
C.Convergent portion
E.Convergent divergent portion
5. In convergent nozzle velocity velocity attained is.......
A.Velocity of sound
B.Supersonic velocity
C.Around 500 m/sec
D.1000 meter/sec
6. The effect of friction in nozzle is to .......
A.Keep dryness fraction constant
B.Increase dryness fraction
C.Decrease dryness fraction
D.First increase dryness fraction upto certain limit and then decrese it
7. Under thermal equilibrium, flow of steam is.......
A.Isentropic
B.Adiabatic
C.Hyperbolic
D.Polytropic
8.The critical pressure ratio for initially superheated steam is.......as compared to initially dry saturated steam
A. More
B.Less
C.Same
D.None of the above
9.For critical pressure ratio, the discharge through a nozzle is.......
A.Maximum
B.Minimum
C.Zero
D.Some value between maximum and minimum
10.. For a convergent divergent nozzle,critical pressure ratio occurs when .......
A.Velocity at exit becomes sonic
B.Shock wave of occurs
C. Nozzle efficiency is maximum
D.Increase in exit and inlet pressure ratio does not increase steam flow rate
