Heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum
Water is supplied in drum and through down comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam
Feed pump is employed to supplement natural circulation in water wall type furnace
Water is converted into steam in one pass without any recirculation
D. Water is converted into steam in one pass without any recirculation
Velocity of steam
Specific volume of steam
Dryness fraction of steam
All of these
Increases
Decreases
Remain constant
May increase or decrease depending upon the method of storage
The factor of evaporation for all boilers is always greater than unity.
The amount of water evaporated in kg per kg of fuel burnt is called equivalent evaporation from and at 100° C.
The ratio of heat actually used in producing the steam to the heat liberated in the furnace is called boiler efficiency.
None of the above
60°
90°
180°
270°
No drum
One drum
Two drums
Three drums
Heat transfer takes place across cylinder walls
Work is done
Steam may be wet, dry or superheated after expansion
All of the above
Pressure only
Temperature only
Dryness fraction only
Pressure and dryness fraction
Horizontal
Vertical
Inclined
Horizontal and inclined
1.02 to 1.06
1.08 to 1.10
1.2 to 1.6
1.6 to 2
Increases
Decreases
Remains constant
None of these
Multi tubular
Horizontal
Internally fired
All of the above
100°C
Above dew point temperature of flue gases
Below dew point temperature of flue gases
Less than wet bulb temperature of flue gases
Carnot cycle
Rankine cycle
Joule cycle
Stirling cycle
The efficiency of steam turbines is greater than steam engines
A flywheel is a must for steam turbine
The turbine blades do not change the direction of steam issuing from the nozzle
The pressure of steam, in reaction turbines, is increased in fixed blades as well as in moving blades
Cavitation of boiler feed pumps
Corrosion caused by oxygen
Heat transfer coefficient
pH value of water
Straight
Circular
Curved
None of these
Equal to unity
Less than unity
Greater than unity
None of these
Less efficient and less economical
Less efficient and more economical
More efficient and less economical
More efficient and more economical
Unburnt carbon in ash
Incomplete combustion
Ash content
Flue gases
Internally fired
Externally fired
Internally as well as externally fired
None of these
48 : 20 : 15 : 7 : 10
10 : 7 : 15 : 20 : 48
20 : 48 : 7 : 15 : 10
7 : 15 : 20 : 10 : 48
Velocity compounding
Pressure compounding
Pressure-velocity compounding
All of these
Non-coking bituminous coal
Brown coal
Peat
None of the above
Zero
One
Two
Four
Producer gas
Coal gas
Water gas
Blast furnace gas
Horizontal
Vertical
Inclined
None of these
sin²α
cos²α
tan²α
cot²α
Efficiency of the boiler
Efficiency of the chimney
Efficiency of the fan
Power of the boiler
Steam condenser
Steam boiler
Steam preheater
Economiser
As an impulsive force
As a reaction force
Partly as an impulsive force and partly as a reaction force
None of the above