Babcock and Wilcox
Locomotive
Lancashire
Cochran
21 %
23 %
30 %
40 %
One
Two
Three
Four
More
Less
Equal
None of these
Internally fired
Externally fired
Internally as well as externally fired
None of these
Divergent nozzle
Convergent nozzle
Convergent-divergent nozzle
None of these
Number of casing
Number of entries of steam
Number of exits of steam
Each row of blades
kg of steam produced
Steam pressure produced
kg of fuel fired
kg of steam produced per kg of fuel fifed
Water passes through the tubes which are surrounded by flames and hot gases
The flames and hot gases pass through the tubes which are surrounded by water
Forced circulation takes place
None of these
Large marine propulsion
Electric power generation
Direct drive of fans, compressors, pumps
All of these
Temperature, time, and turbulence
Total air, true fuel, and turbulence
Thorough mixing, total air and temperature
Total air, time, and temperature
Low
Very low
High
Very high
Boiler effectiveness
Boiler evaporative capacity
Factor of evaporation
Boiler efficiency
Linearly
Rapidly first and then slowly
Slowly first and then rapidly
Inversely
One-fourth
One-third
Two-fifth
Three-fifth
More
Less
Equal
None of these
1 kg/cm
6 kg/cm
17 kg/cm²
100 kg/cm²
Decreasing initial steam pressure and temperature
Increasing exhaust pressure
Decreasing exhausts pressure
Increasing the expansion ratio
Latent heat is zero
Liquid directly becomes steam
Specific volume of steam and liquid is same
This is the maximum pressure limit
Boiler drums
Superheater tubes
Economiser
A separate coil located in convection path.
30 MW
60 MW
100 MW
500 MW
More heating surface
Less heating surface
Equal heating surface
Heating surface depends on other parameters
The steam is expanded in nozzles only and there is a pressure drop and heat drop
The steam is expanded both in fixed and moving blades continuously
The steam is expanded in moving blades only
The pressure and temperature of steam remains constant
Pulverising coal in inert atmosphere
Heating wood in a limited supply of air at temperatures below 300°C
Strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel
Enriching carbon in the coal
Wholly in blades
Wholly in nozzle
Partly in the nozzle and partly in blades
None of these
1.02 to 1.06
1.08 to 1.10
1.2 to 1.6
1.6 to 2
Cut-off ratio
Expansion ratio
Clearance ratio
None of these
Heat drop in fixed blades to the heat drop in moving blades
Heat drop in moving blades to the heat drop in fixed blades
Heat drop in moving blades to the heat drop in fixed blades plus heat drop in moving blades
Heat drop in fixed blades plus heat drop in moving blades to the heat drop in moving blades
Drooping characteristic
Linear characteristic
Rising characteristic
Flat characteristic
15 %
20 %
30 %
45 %