Horizontal multi-tubular water tube boiler
Water wall enclosed furnace type
Vertical tubular fire tube type
Horizontal multi-tubular fire tube type
D. Horizontal multi-tubular fire tube type
Increases
Decreases
Remain same
None of these
Equal to
Less than
More than
None of these
180° to each other
90° to each other
0° to each other
None of these
Non-coking bituminous coal
Brown coal
Peat
None of the above
Prevent flat surfaces under pressure from tearing apart
Take care of failure in shear
Take care of failure in compression
Provide support for boiler
100 kg/cm² and 540°C
1 kg/cm² and 100°C
218 kg/cm² abs and 373°C
218 kg/cm² abs and 540°C
137 fire tubes and 44 superheated tubes
147 fire tubes and 34 superheated tubes
157 fire tubes and 24 superheated tubes
167 fire tubes and 14 superheated tubes
Have common piston rod
Are set at 90°
Have separate piston rods
Are set in V-arrangement
Cut-off ratio
Expansion ratio
Clearance ratio
None of these
1 m
2 m
3 m
4 m
Does not change
Increases
Decreases
None of these
The cost of the engine, for the same power and economy, is more than that of a simple steam engine.
The forces in the working parts are increased as the forces are distributed over more parts.
The ratio of expansion is reduced, thus reducing the length of stroke.
The temperature range per cylinder is increased, with corresponding increase in condensation.
Velocity increases
Velocity decreases
Velocity remains constant
Pressure remains constant
Blow off cock
Fusible plug
Superheater
Stop valve
Serve as storage of steam
Serve as storage of feed water for water wall
Remove salts from water
Separate steam from water
Melting point rises slightly and boiling point drops markedly
Melting point rises markedly and boiling point drops markedly
Melting point drops slightly and boiling point drops markedly
Melting point drops slightly and boiling point drops slightly
Increase thermal efficiency of boiler
Economise on fuel
Extract heat from the exhaust flue gases
Increase flue gas temperature
Heat transfer takes place
Work is done by the expanding steam
Internal energy of steam changes
None of the above
Chimney
Centrifugal fan
Steam jet
None of these
Ash
Volatile matter
Moisture
Hydrogen
0.17 MN/m²
1.7 MN/m²
17 MN/m²
170 MN/m²
Lancashire boiler
Babcock and Wilcox boiler
Yarrow boiler
None of these
The ratio of heat actually used in producing the steam to the heat liberated in the furnace
The amount of water evaporated or steam produced in kg per kg of fuel burnt
The amount of water evaporated from and at 100°C into dry and saturated steam
The evaporation of 15.653 kg of water per hour from and at 100°C
ps - pa
pa - ps
pa + ps
None of these
4.75 mm
5.47 mm
7.45 mm
47.5 mm
More
Less
Equal
May be more or less depending on capacity of reheater
Better burning
More calorific value
Less radiation loss
Medium sized units
p₁. p₂
p₁/p₂
p₂/p₁
p₁ + p₂
Non-coking bituminous coal
Brown coal
Pulverised coal
Coking bituminous coal
Horizontal
Vertical
Inclined
None of these