Top 150+ Solved Thermal Engineering 1 MCQ Questions Answer
Q. Fusible plug for boilers is made of fusible metal containing tin, lead, and
a. bismuth
b. copper
c. aluminium
d. nickel
Q. The ratio of heat utilised to produce steam and the heat liberated in furnace is known as
a. boiler effectiveness
b. boiler evaporative capacity
c. factor of evaporation
d. boiler efficiency.
Q. It is required to produce large amount of steam at low pressure. Which boiler should be used ?
a. pulverised fuel fired boiler
b. cochran boiler
c. lancashire boiler
d. babcock and wilcox boiler
Q. Size of boiler tubes is specified by
a. mean diameter and thickness
b. inside diameter and thickness
c. outside diameter and thickness
d. outside diameter and inside diameter
Q. The heat loss in a boiler takes place in the form of
a. heat carried away by flue gases
b. heat carried away by ash
c. radiation
d. all of the above.
Q. In a recuperative air preheater, the heat is transferred
a. from a metal wall from one medium to another
b. from heating an itermediate material and then heating the air from this material
c. by direct mixing ,
d. heat is tr
Q. The function of injector used in small capacity boilers is to
a. create vacuum
b. inject chemical solution in feed pump
c. pump water, similar to boiler feed pump
d. add make up water in the system
Q. The maximum discharge through a chimney occurs when the height of chimney is
a. infinitely long
b. around 200 meters
c. equal to the height of the hot gas column producing draught
d. outside temperature is very low
Q. The economiser is used in boilers to
a. increase thermal efficiency of boiler
b. economise on fuel
c. extract heat from the exhaust flue gases
d. increase flue gas temperature
Q. An economiser in a boiler
a. increases steam pressure
b. increases steam flow
c. decreases fuel consumption
d. decreases steam pressure
Q. The safety valve on boiler drum compared to safety valve on superheater is set at
a. same value
b. higher value
c. lower value
d. lower/higher depending on steam flow
Q. The capacity of induced draft fan compared to forced draft fan in a boiler is
a. same
b. more
c. less
d. less or more depending on size of boiler
Q. Evaporative capacity of boiler is expressed as
a. kg of steam produced
b. steam pressure produced
c. kg of fuel fired
d. kg of steam produced per kg of fuel fired