A. Aluminium foil
B. Refractory bricks
C. Iron plate
D. Coke breeze
A. Through a metallic wall
B. By direct contact of hot flue gas with air
C. By heating an intermediate material (like chequor bricks) and then heating the air from this
hot material
D. None of these
A. Extremely low
B. Low
C. High
D. No
A. Presence of a non-condensable gas decreases the condensing film co-efficient
B. Gases under high pressure are routed through the tube side, because high pressure gases are
corrosive in nature
C. Gases to be heated/cooled is normally routed through the shell side, because the corrosion
caused by the cooling water or steam condensate remain localised to the tubes
D. All A, B. & C.
A. Brick
B. Air
C. Water
D. Silver
A. Eddies current
B. Conduction
C. Convection
D. None of these
A. Has the unit m2 /sec
B. Is defined as K/ρ . Cp
C. Is the ratio of thermal conductivity to thermal capacity
D. All A., B. and C.