Which of the following is a heat treatment furnace ?
(A) Muffle furnace
(B) Annealing furnace
(C) Reheating furnace
(D) Rotary kiln
An electric furnace producing heat by means of an electric arc struck between each of three electrodes and the charge is called ____________ furnace?
(A) Resistance
(B) Arc
(C) Low frequency induction
(D) None of these
Size of the combustion chamber of a furnace depends upon the ___________________?
(A) Heat release rate of the fuel
(B) Preheat temperature of fuel & air
(C) Method of mixing the fuel & air
(D) All
Pick out the wrong statement about a streamline ?
(A) It is always parallel to the main direction of the fluid flow
(B) It is a line across which there is no flow and it is equivalent to a rigid boundary
(C) Streamlines intersect at isolated point of zero velocity and infinite velocity
(D) The fluid lying between any two streamlines can be considered to be in isolation and the streamline spacing varies inversely as the velocity
To reduce the stack loss, heat recovery from flue gas can be done by_____________________?
(A) Preheating of cold stock
(B) Preheating of combustion air
(C) Steam generation in waste heat boilers
(D) All
Pick out the wrong statement?
(A) The form drag is dependent upon the occurrence of a wake
(B) The shear stress at any given cross-section of a pipe for steady flow (either laminar or turbulent) varies linearly as the radial distance
(C) An ideal fluid is the one, which has negligible surface tension and obeys the Newton’s law of viscosity
(D) Existence of the boundary layer in fluid flow is because of viscosity of the fluid.
The advantages of firing pulverised coal in the furnace lies in the fact that, it_____________________?
(A) Permits the use of high ash content coal
(B) Permits the use of low fusion point ash coal
(C) Accelerates the burning rate and economises on fuel consumption
(D) All
Large tonnage of refractory bricks are dried in a_____________________?
(A) Shaft furnace
(B) Rotary hearth furnace
(C) Tunnel kiln
(D) Muffle furnace
Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing ?
(A) Ash disposal problem
(B) Excessive fly ash discharge from the stack
(C) Higher power consumption in its transportation
(D) Erosion of induced draft fan blades