POWER SYSTEM MCQ

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POWER SYSTEM MCQ_04

GENERATION

Q.46 An economizer is device which extracts heat from ____ to heat feed water before fed to boiler.

1 point

coal combustion

taping of steam before turbine

flue gases

all of the above

Clear selection

Q.47 A _______device which extracts heat from the flue gases and increases the temperature of air used for coal combustion.

1 point

supper heater

air pre-heater

Economizer

ESP

Clear selection

.48 What are the principle benefit of preheating of air?

1 point

reduced coal consumption

increased steam capacity per square meter of boiler surface

increased thermal efficiency

all of the above

Clear selection

Q.49 A steam fed to turbine is

1 point

dry and supper heated

wet steam

in between dry and wet steam

none of the above

Clear selection

Q.50 The ____ of the steam is converted into mechanical energy while passing over the blades of turbine.

1 point

potential energy

heat energy

chemical energy

none of the above

Clear selection

Q.51 A steam is exhausted to the ____ after giving heat energy to the turbine.

1 point

condenser

cooling tower

water treatment plant

atmosphere

Clear selection

Q.52 A condenser is device which condenses the exhausted steam by means of ___

1 point

cold water circulation

gases circulation

mixture of water and gases circulation

water circulation from boiler feed pump

Clear selection

Q.53 A condenser is device which condenses the steam exhausted from____

1 point

intermediate stage

supper heater

turbine

cooling tower

Clear selection

Q.54 A feed water is

1 point

free from impurities

free from sluggish

free from dissolved gases

all of the above

Clear selection

Q.55 A water heater and economizer helps to

1 point

increase overall efficiency of plant

increases water consumption

reduce water consumption

increases the feed water pressure

Clear selection

Q.56 A feed water is fed to boiler by means of

1 point

condensate extraction pump

boiler feed pump

cooling tower pumps

any of the above

Clear selection

Q.57 A low pressure at the exhaust can be achieved by____.

1 point

condensing the steam at intermediate stage

condensing the steam at cooling tower

condensing the steam at turbine exhaust

heating of feed water by means of high pressure heater

Clear selection

Q.58 The efficiency of the power station is increased by

1 point

increasing turbine exhausts pressure

reducing turbine exhaust pressure

reducing cooling tower pressure

all of the above

Clear selection

Q.59 Why the removal of ash from boiler is necessary?

1 point

for proper burning of coal

proper burning of oil

proper air circulation

proper feed water circulation

Clear selection

Q.60 The overall efficiency of thermal power station is about___

1 point

95%

50%

29%

10%

Clear selection

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