Q.1
##### What is Wilson line?
• a) It is an isothermal line, at which the condensation completes
• b) Saturation line of water is also called Wilson line
• c) It represents the limiting condition of undercooling at which the condensation begins
• d) It represents an Isobaric line, at which the condensation commences
Q.2
• a) True
• b) False
Q.3
• a) True
• b) False
Q.4
##### Calculate the enthalpy drop steam enters a convergent-divergent nozzle atbar and 250°C and leaves at 1 bar. The expansion is to be considered metastable.
• a) 427031.34 kJ/kg
• b) 55648.32 kJ/kg
• c) 323654.25 kJ/kg
• d) 158469.21 kJ/kg
Q.5
• a) 165°C
• b) 143°C
• c) 154°C
• d) 120°C
Q.6
• a) 36.65°C
• b) 45.54°C
• c) 23.32°C
• d) 62.87°C
Q.7
• a) 5.65
• b) 3.11
• c) 2.15
• d) 2.36
Q.8
##### Steam atbar pressure and 250°C enters a convergent-divergent steam nozzle and leaves at 4 bar. The mass flow rate is 5 kg/s. Calculate the exit area of the nozzle if the expansion is metastable.
• a) 0.00542187 m2
• b) 0.0029147 m2
• c) 0.036521 m2
• d) 0.003265 m2
Q.9
• a) 1.300
• b) 1.013
• c) 1.135
• d) 1.000
Q.10
##### Which of the following statement about metastable expansion of steam through a steam nozzle is FALSE?
• a) It increases the discharge through the nozzle
• b) Steam is undercooled to a temperature less than that corresponding to its pressure
• c) Density of steam is increased
• d) Exit velocity of the steam is increased
Q.11
##### The point on the h-s diagram at which the condensation beings and normal conditions of thermal equilibrium are restored is said to be on _____
• a) wilson line
• b) saturation vapor curve
• c) constant dryness fraction line
• d) constant pressure line
Q.12
##### Which of the following is NOT an effect of supersaturation in steam flowing through a convergent-divergent nozzle?
• a) Increase in specific volume of steam
• b) Increase in the entropy of steam
• c) Improvement in dryness fraction
• d) Increase in the enthalpy drop
Q.13
• a) 4 bar
• b) 3 bar
• c) 2 bar
• d) 1 bar