Steam and Gas Turbines Multiple Choice Questions on “Wet and Supersaturated Steam”.
1. Mixture of steam and liquid water is called as _________
a) dry steam
b) wet steam
c) saturated steam
d) none of the mentioned
Answer: b
Clarification: Mixture of steam and liquid water is called as wet steam. Where as dry steam is boiled steam and sometimes dry steam is also called as saturated steam.
2. Supersaturated steam is also called as _________
a) saturated steam
b) single phase mix
c) two phase mix
d) none of the mentioned
Answer: c
Clarification: In supersaturated steam there is a mixture of two phases gaseous and liquid, so it is called a two phase mix.
3. If heat is added to the wet steam temperature _________
a) raises immediately
b) decreases immediately
c) raises after sometime
d) none of the mentioned
Answer: c
Clarification: When heat is added to the steam immediately the liquid particles try to evaporate and form saturated steam only after that the temperature starts rising.
4. After steam bubbles break the water surface, they carry water droplets this is called as ________
a) entrainment
b) capillarity
c) reverse capillarity
d) none of the mentioned
Answer: a
Clarification: When steam bubbles break water surface they carry some water droplets. This process is called as entrainment.
5. Entrainment happens at __________
a) liquid surface having contact with atmosphere
b) outlet of the boiler
c) inlet of the boiler
d) none of the mentioned
Answer: b
Clarification: Entrainment happens at the outlet of the boiler.
6. Hydraulic water hammer is caused by _______
a) wet steam
b) dry steam
c) pressurized water
d) none of the mentioned
Answer: a
Clarification: Hydraulic water hammer is caused by wet steam.
7. Hydraulic water hammer is caused due to ______
a) humidity in pipelines
b) accumulation of condensate
c) humidity in pipelines & accumulation of condensate
d) none of the mentioned
Answer: c
Clarification: Hydraulic water hammer is caused due to humidity on pipelines or accumulation of condensate.
8. Resistance of water dominating the steam is called as _______
a) hydraulic water hammer
b) erosion
c) contamination
d) none of the mentioned
Answer: b
Clarification: Resistance of water hammer dominating steam is called erosion.
9. When steam is transported dryness fraction _________
a) increases
b) decreases
c) remains constant
d) none of the mentioned
Answer: b
Clarification: When steam travels in pipeline its dryness fraction increases.
10. Wet steams causes corrosion.
a) True
b) False
Answer: a
Clarification: Wet steam may cause
corrosion
erosion
hydraulic water hammer in pipelines
destroy turbine blades etc.