WorksheetsPERFORMANCE OF BOILERS
Total questions: 20
Worksheet time: 10mins
The amount of water evaporated in kg per kg of fuel burnt is called
Equivalent evaporation
Evaporative Capacity
Boiler efficiency
None of the Above
The major heat loss in boiler is due to
Moisture in fuel
Dry fuel gases
blow down
Unburnt fuel
Unit of evaporation factor is
kg of fuel/kg of air
kJ/kg
kJ/kg k
no unit
The ratio of heat actually used in producing the steam to the heat liberated in the furnace is called
Equivalent evaporation
Evaporative capacity
Boiler efficiency
Factor of evaporation
The process of heating in the boiler is considered as
Steady flow process
Unsteady flow process
Constant temperature process
None of the above
Steam trap is
Mounting of the boiler
Accessory of the boiler
Fitting of the steam carrying pipe
None of the above
Economizer of the boiler is used
Extract heat from flue gases and preheat the air
To keep the pressure constant
Extract heat from air and preheat the flue gases
Keep temperature constant
A device used to increase the temperature of saturated steam without raising its pressure, is called
fusible plug
stop valve
superheater
economiser
High pressure boilers operate at pressures above ?
80 bar
120 bar
140 bar
180 bar
For combustion of a fuel, following is essential-
Correct fuel air ratio
Proper ignition temperature
O₂ to support combustion
All the three above
Which of the following is a water tube boiler?
Locomotive boiler
Cochran boiler
Cornish boiler
Babcock and Wilcox boiler
Which of the following boilers has the highest heat transfer capacity?
Subcritical boiler
Critical boiler
Forced circulation boiler
Supercritical boiler
The draught may be produced by
a mechanical fan
chimney
steam jet
all of these
When the enthalpy of steam is hs kJ/kg and the enthalpy of feed water is hf kJ/kg, then the factor of evaporation is given by
2257(hs−hf)
2257(hs+hf)
(hs−hf)2257
(hs+hf)2257
Fire tube boilers are suitable for high capacity plants
True
False
Identify the boiler type
Water type
liquid fuel type
Fire tube type
Coal type
Identify the type of boiler
Fire type
Water type
Coal type
vertical type
Which of the following is not a Boiler standard?
British standards, BS845 : 1987
ASME Standard : PTC-4-1 Power Test Code for Steam Generating Units
S 8753 : Indian Standard for Boiler Efficiency Testing
ASHRAE 62.1
IN WHICH METHOD, boiler efficiency is calculated by knowing the losses
Direct
Indirect
Field
None of these
A steam power plant using steam as working substance works basically on
Rankine cycle
Carnot cycle
Bell Coleman cycle
VCC cycle
