Before the economiser
Before the superheater
Between the economiser and chimney
None of these
C. Between the economiser and chimney
Lancashire boiler
Locomotive boiler
Babcock and Wilcox boiler
Benson boiler
High pressure and a low velocity
High pressure and a high velocity
Low pressure and a low velocity
Low pressure and a high velocity
Air present in atmosphere at NTP conditions
Air required for complete combustion of fuel with no excess air
Air required for optimum combustion so as to have reasonable excess air
Air required to convert CO into CO₂
Slow speed engine
Vertical steam engine
Condensing steam engine
Non-condensing steam engine
Equal to the velocity of sound
Less than the velocity of sound
More than the velocity of sound
None of these
6.25 mm
62.5 mm
72.5 mm
92.5 mm
21 %
23 %
30 %
40 %
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
0.1
0.3
0.5
0.8
Increases
Decreases
Remain unaffected
First increases and then decreases
Constant volume
Constant temperature
Constant pressure
Constant entropy
24 m
35 m
57.5 m
79 m
Pressure drop across the rotor
Change in axial velocity
Both (A) and (B)
None of these
To blow off steam when the pressure of steam inside the boiler exceeds the working pressure
To indicate the water level inside the boiler to an observer
To measure pressure of steam inside the steam boiler
None of the above
Safety valve
Water level indicator
Pressure gauge
Fusible plug
0.528
0.546
0.577
0.582
Same
Less
More
None of these
One fourth
Half
One
Two
No heat drop in moving blades
No heat drop in fixed blades
Maximum heat drop in moving blades
Maximum heat drop in fixed blades
40 %
50 %
75 %
90 %
One-half the height of chimney
Equal to the height of chimney
Two times the height of chimney
Four times the height of chimney
More
Less
Equal
None of these
Steam boiler
Steam turbine
Steam condenser
Steam injector
79 m/s
188 m/s
450 m/s
900 m/s
Equal to unity
Less than unity
Greater than unity
None of these
Volume of intake steam
Pressure of intake steam
Temperature of intake steam
All of these
CO₂
CO
O₂
N₂
Mean diameter and thickness
Inside diameter and thickness
Outside diameter and thickness
Outside diameter and inside diameter
The critical pressure gives the velocity of steam at the throat equal to the velocity of sound.
The flow in the convergent portion of the nozzle is subsonic.
The flow in the divergent portion of the nozzle is supersonic.
To increase the velocity of steam above sonic velocity (supersonic) by expanding steam below the critical pressure, the divergent portion for the nozzle is not necessary.
Decreasing initial steam pressure and temperature
Increasing exhaust pressure
Decreasing exhausts pressure
Increasing the expansion ratio