Pick out the wrong statement?
(A) The shear stress at the pipe (dia = D, length = L) wall in case of laminar flow of Newtonian fluids is (D/4L). Δp
(B) In the equation, T. gc = k. (du/dy)n the value of ‘n’ for pseudoplastic and Dilatant fluid are 1 respectively
(C) Shear stress for Newtonian fluid is proportional to the rate of shear in the direction perpendicular to motion
(D) With increase in the Mach number >0.6, the drag co-efficient decreases in case of compressible fluids
Pick out the wrong statement ?
(A) Momentum transfer in laminar flow results from velocity gradient
(B) A fluid in equilibrium is not free from shear stress
(C) The viscosity of a non-Newtonian fluid is a function of temperature only
(D) Both
Heat transfer rate to the stock/charge in the furnace does not depend upon the________________?
(A) Emissivity of the refractory walls
(B) Size of the furnace
(C) Use of waste heat recovery equipments
(D) Thickness of the stock
Pick out the correct statement?
(A) A forced vortex occurs when fluid rotates as a solid about an axis
(B) In laminar flow, Newton’s law of viscosity does not apply
(C) A free vortex occurs, when fluid rotates as a solid
(D) In turbulent flow, there are neither cross-currents nor eddies
Fuel used in B.F. stove is______________________?
(A) Pulverised coal
(B) Furnace oil
(C) Blast furnace gas/mixed gas
(D) Coke oven gas
Reverberatory furnace is used for_____________________?
(A) Roasting/reduction of ores
(B) Annealing steel coil
(C) Heating air
(D) Steel melting
Which furnace employs an I.D. fan for the removal of flue gases from the furnace ?
(A) Coke oven
(B) Blast furnace stoves
(C) Beehive coke oven
(D) High pressure boiler
Cement Kiln is a___________________?
(A) Rotary Kiln
(B) Tunnel Kiln
(C) Natural draft furnace
(D) Batch furnace
Which of the following accentuates clinkering troubles on furnace grate burning coal ?
(A) Low reactivity of carbonised residue containing high proportion of iron & sulphur
(B) Low forced draft & fuel bed temperature
(C) Thick firebed and preheated primary air
(D) All
Heat transfer rate to the charge/stock in a furnace does not depend upon the________________?
(A) Type of fuels viz. solid, liquid or gaseous
(B) Flue gas temperature
(C) Emissivity of refractory walls
(D) Initial temperature of the charged stock