Power System MCQ #18

Power System MCQ 241 to 244:

241) In thermal power plant, the super-heater is a device

      (a) increases the steam temperature above the saturation temperature

      (b) which removers the last traces of moisture from the saturated steam leaving the boiler

      (c) which removers the last traces of moisture from the saturated steam leaving the turbine exhaust

      (d) Both A and B

242) From below options, which is a type of super heater

      (a) radiant superheaters

      (b) combinations of radiant and convection superheaters

      (c) convection superheaters

      (d) all of the above

243) The boiler efficiency is increased _____ by using economizer.

      (a) 10-12%

      (b) 5%

      (c) 15-20%

      (d) 5-10%

244) In modern economizer, the temperature of the feed water is raises from about ___ °C to ___ °C

      (a) 100, 150

      (b) 247, 276

      (c) 300, 350

      (d) 80, 120

ANSWER: | 241-D | 242-D | 243-A | 244-B |

Power System MCQ 245 to 248:

245) The design of boiler depends upon the ______ of the boiler.

      (a) characteristic of operating labor, life and efficiency

      (b) height, weight, bulk

      (c) portability, safety

      (d) all of the above

246) The selection and size of the boiler is depending upon which factor/s?

      (a) portable load factor

      (b) operating temperature and pressure

      (c) the output required in term of amount of steam per hour

      (d) all of the above

247) Which material is used in the boiler furnace wall _____.

      (a) cement material

      (b) refractory material

      (c) Asbestos material

      (d) cement with concrete material

248) In boiler the combustion of coal is controlled by

      (a) the damper opening

      (b) quantity of coal entering the grate

      (c) controlling the grate speed

      (d) all of the above

ANSWER: | 245-D | 246-D | 247-B | 248-D |

Power System MCQ 249 to 252:

249) In combustion of coal, air drawn from atmosphere to combustion chamber is through

      (a) forced draught fan

      (b) induced draught fan

      (c) Both A and B

      (d) naturally

250) The function of deaerator is to

      (a) increase the dissolved gases

      (b) reduced conductivity of water

      (c) reduce the dissolved gases

      (d) increase the pH value of water

251) The cooling water is passing through screens to _____

      (a) remove the matters

      (b) eliminate the choke the condensate tube

      (c) increase the conductivity of water

      (d) Both A and B

252) In evaporator, the water is heated by ____

      (a) high pressure heater

      (b) economizer

      (c) low pressure heater

      (d) turbine exhaust steam

ANSWER: | 249-C | 250-C | 251-D | 252-C |

Power System MCQ #18