STEAM CONDENSERS MULTIPLE CHOICE QUESTIONS (MCQ) WITH ANSWERS
STEAM CONDENSERS
MULTIPLE-CHOICE QUESTIONS
(MCQ) WITH ANSWERS
MCQ on steam condensers increase the
understanding about the working
of condensers. Later, it helps in the
design of condensers.
Fig. Surface Steam Condenser
Fig. Jet Steam Condenser
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A condenser condenses steam coming from the
(a) Boiler
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(b) Super heater
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(c) Economizer
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(d) None
ANS: (d)
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A condenser in a steam thermal plant
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(a) Decreases expansion ratio in the turbine
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(b) Decreases back pressure of steam
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(c) Increases condensation temperature
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(d) None
-
ANS: (b)
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Hot water coming out of condenser is cooled in a
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(a) Shell and tube heat exchanger
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(b) In a finned tube heat exchanger
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(c) In a cooling pond
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(d) None
-
ANS: ©
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Surface condenser is one in which
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(a) Steam passes through the tubes and the water is outside
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(b) Air passes through the tubes and the water is outside
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(c) Water passes through the tubes and the steam is outside
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(d) None
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ANS: ©
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In a surface condenser, condensate and cooling water are
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(a) Mixed fully
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(b) Mixed partially
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(c) Not mixed
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(d) None
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ANS: ©
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In a Jet condenser, condensate and cooling water are-
(a) Mixed fully
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(b) Mixed partially
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(c) Not mixed
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(d) None
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ANS: (a)
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Pressure in the condenser of a steam plant is
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(a) More than atmospheric
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(b) Equal to atmospheric
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(c) Less than atmospheric
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(d) None
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ANS: ©
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Surface condensers and jet condensers of the same cooling capacity are compared
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(a) Overall size is bigger of the surface condenser
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(b) Sizes are equal
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(c) Size of the surface condenser is smaller than the jet condenser
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(d) None
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ANS: (a)
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Condensate can be used as feed water in a
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(a) Jet condenser
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(b) Surface condenser
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(c) Both in Jet and Surface condenser
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(d) None
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ANS: (b)
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Cooling capacity of surface condensers is
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(a) Greater than that of Jet condensers
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(b) Equal to that of Jet Condenser
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(c) Less than that of Jet condensers
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(d) None
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ANS: (a)
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Cooling water requirements for the same cooling capacity is
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(a) Greater in Jet condenser
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(b) Same in Jet and surface condenser
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(c) Less in Jet condenser
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(d) None
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ANS: (c)
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For same cooling requirements, maintenance cost is
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(a) Less in Jet condenser
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(b) Equal in both surface and Jet condenser
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(c) More in Jet condenser
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(d) None
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ANS:(a)
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For the same cooling requirements, power to operate the air pump are
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(a) More in a Jet condenser
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(b) Less in a Jet condenser
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(c) Same in Jet and surface condenser
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(d) None
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ANS: (a)
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For the same cooling requirements, power used in pumping water is
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(a) More in Jet condensers
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(b) Less in a Jet condenser
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(c) Equal both in Jet and Surface condenser
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(d) None
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ANS: (a)
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The actual vacuum in a condenser is
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(a) Barometric pressure+ Actual pressure
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(b) Gauge pressure—atmospheric pressure
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(c) Gauge pressure + atmospheric pressure
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(d) None
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ANS: (b)
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The ratio of actual vacuum to the ideal vacuum in a condenser is called
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(a) Boiler efficiency
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(b) Condenser efficiency
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(c) Vacuum efficiency’
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(d) None
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ANS: ©
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The temperature of the condenser is
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(a) Higher than the temperature of the cooling water
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(b) Lower than the temperature of the cooling water
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(c) Equal to the temperature of the cooling water
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(d) None
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ANS: (a)
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The condenser in a steam power plant is placed between the
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(a) Boiler and turbine
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(b) Pump and the boiler
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(c) Turbine and the pump
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(d) None
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ANS: ©
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The condenser used in thermal power plant is
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(a) Air cooled
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(b) Water Cooled
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(c) Evaporative Cooled
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(d) None
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ANS: (c)
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When air is removed in a surface condenser
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(a) Absolute pressure decreases
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(b) Absolute pressure increases
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(c) Absolute pressure remains constant
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(d) None
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(ANS: ( a)
21. The tube material in the steam condenser is
(a) Mild steel
(b) Cast iron
(c) High carbon steel
(d) None
ANS: (d)
22. The tube material in the steam condenser is
(a) Aluminum
(b) Stainless steel
(c) Brass
(d) None
ANS: (c)
23. The vacuum existing in the steam condenser depends upon the
(a) Temperature of steam
(b) Temperature of cooling water
(c) Both (a) & (b)
(d) None
ANS: (b)
24. Steam and cooling water mix in a
(a) Surface condenser
(b) Jet condenser
(c) Both (a) & (b)
(d) None
ANS: (b)
25. Flow of steam in a parallel flow low level jet condenser is from
(a) Top to bottom
(b) Bottom to top
(c) Both (a) & (b)
(d) None
ANS: (a)
26. Flow of cooling water in a parallel flow low level jet condenser is
(a) Top to bottom
(b) Bottom to top
(c) Both (a) & (b)
(d) None
ANS: (a)
27. Flow of steam in a counter flow low level jet condenser is
(a) Top to bottom
(b) Bottom to top
(c) Both (a) & (b)
(d) None
ANS: (b)
28. Flow of cooling water in a counter flow low level jet condenser is
(a) Top to bottom
(b) Bottom to top
(c) Both (a) & (b)
(d) None
ANS: (a)
29.Flow of steam in a high-level jet condenser is
(a) Top to bottom
(b) Bottom to top
(c) Both (a) & (b)
(d) None
ANS: (b)
28. Flow of cooling water in a high-level jet condenser is
(a) Top to bottom
(b) Bottom to top
(c) Both (a) & (b)
(d) None
ANS: (a)
29. In an ejector condenser, steam water mix flow through
(a) A changing area of cross section
(b) constant area of cross section
(c) Can’t say
(d) None
ANS: (b)
30. The construction of a jet condenser is
(a) Easy to understand
(b) Difficult to understand
(c) Neither difficult nor simple
(d) none
ANS: (a)
31. A jet condenser is
(a) Bulky
(b) Compact
(c) Medium size
(d) None
ANS: (b)
32. The amount of cooling water required is less in a
(a) Jet condenser
(b) Surface condenser
(c) Both (a) & (b)
(d) None
ANS: (a)
33. Condensate is a waste in a
(a) Jet condenser
(b) Surface condenser
(c) Both (a) & (b)
(d)None
ANS: (a)
34. Power required in a jet condenser vs surface condenser is
(a) Less
(b) More
(c) Equal
(d) None
ANS: (b)
35. Vacuum efficiency of jet condenser vs surface condenser is
(a) Less
(b) High
(c) equal
(d) none
ANS: (a)
36. The capacity of jet condenser vs surface condenser is
(a) high
(b) Low
(c) Equal
(d) None
ANS: (b)