Power Plant | Power Plant Objective Type Questions and answers

26. The pressure at the furnace is minimum in case of.......

   A.Forced draught system

   B.Induced draught system

   C.Balanced draught system

   D.Natural draught system

27. Economiser is used to........

   A.Heat air

   B.Heat feed water

   C.Heat flue gases

   D.All of the above

28. Critical pressure ratio of a convergent nozzle is defined as........

   A.The ratio of inlet presssure to outlet pressure of nozzle

   B.The ratio of outlet presssure to inlet pressure of nozzle

   C.The ratio of outlet pressure to inlet pressure only when mass flow rate per unit area is minimumn

   D.The ratio of outlet pressure to inlet pressure only when mass flow rate per unit area is maximumn

29. The value of reheat factor is ........

   A.0.5% to 0.6%

   B.1.02% to 1.06%

   C.0.9% to 0.95%

   D.1.2% to 1.6%

30. Economoser improves boiler efficiency........

   A.4% to 5%

   A.1% to 5%

   C.10% to 12%

   D.18% to 20%

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