315) The diameter of fire tubes in Cochran boiler is of the order of

2 cm

6 cm

8 cm

12 cm

Answer is:

6 cm

from a metal wall from one medium to another

from heating an intermediate material and then heating the air from this material

by direct mixing ,

heat is transferred by bleeding some gases from furnace

Answer is:

water

dry steam

wet steam

super heated steam

Answer is:

100°C

above dew-point temperature of flue gases

below dew-point temperature of flue gases

less than wet bulb temperature of flue gases

Answer is:

from a metal wall from one medium to another

from heating an intermediate material and then heating the air from this material

by direct mixing

heat is transferred by bleeding some gas from furnace

Answer is: