internally fired boiler

externally fired boiler

natural circulation boiler

forced circulation boiler

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

horizontal

vertical

inclined

none of these

1.05

2.86

6.65

10.05

to reduce the ratio of expansion in each cylinder

to reduce the length of stroke

to reduce the temperature range in each cylinder

all of the above