40 percent
50 percent
60 percent
70 percent
B. 50 percent
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
Condenser
Condensate pump
Air extraction pump
All of these
Regeneration
Reheating of steam
Both (A) and (B)
Cooling of steam
Efficiency of the boiler
Efficiency of the chimney
Efficiency of the fan
Power of the boiler
Can be raised rapidly
Is raised at slower rate
Is raised at same rate
Could be raised at fast/slow rate depending on design
Lancashire boiler
Locomotive boiler
Babcock and Wilcox boiler
Benson 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
Increases the mean effective pressure
Increases the workdone
Decreases the efficiency of the engine
All of these
Heated sufficiently
Burnt in excess air
Heated to its ignition point
Burnt as powder
Desirable
Economical
Essential
Uneconomical
Cavitation of boiler feed pumps
Corrosion caused by oxygen
Heat transfer coefficient
pH value of water
Throttle governing
Cut-off governing
By-pass governing
None of these
Higher effectiveness of boiler
High calorific value coal being burnt
Fouling of heat transfer surfaces
Raising of steam temperature
Form lumps or masses of coke
Burn freely
Show little or no fusing action
Burn completely
Equal to
Less than
Higher than
None of these
Equal to
Lower than
Higher than
None of these
Choked
Under-damping
Over-damping
None of these
40 %
50 %
75 %
90 %
Steam enters and exhausts through the same port
Steam enters at one end and exhausts at the centre
Steam enters at the centre and exhausts at the other end
None of the above
56 %
63 %
74 %
78 %
Wholly in blades
Wholly in nozzle
Partly in the nozzle and partly in blades
None of these
One
Two
One steam drum and one water drum
No drum
Slow speed engine
Vertical steam engine
Condensing steam engine
Non-condensing steam engine
Steam boiler
Steam turbine
Steam condenser
Steam injector
10 atmospheres
20 atmospheres
30 atmospheres
40 atmospheres
Lever safety valve
Dead weight safety valve
High steam and low water safety valve
All of these
Before the economiser
Before the superheater
Between the economiser and chimney
None of these
Linearly
Rapidly first and then slowly
Slowly first and then rapidly
Inversely
Cement industry
Thermal power plant
Blast furnace
Domestic use
To guide motion of the piston rod and to prevent it from bending
To transfer motion from the piston to the crosshead
To convert heat energy of the steam into mechanical work id) to exhaust steam from the cylinder at proper moment
None of these