FURNACE TECHNOLOGY QUIZ

The heat recoverable from flue gases of furnaces depends on the

Thermal efficiency of furnace

Flue gas temperature drop through the furnace

Quantity of flue gases

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Heat balance of furnace provides means of determining the

All of these

Thermal efficiency of the process

Sources of heat losses

Scope of reduction of heat losses

TRUE ANSWER : ?
YOUR ANSWER : ?

An electric furnace producing heat by means of an electric arc struck between each of three electrodes and the charge is called __________ furnace.

Arc

None of these

Resistance

Low frequency induction

TRUE ANSWER : ?
YOUR ANSWER : ?

Calcination of limestone to produce lime is done in a __________ kiln.

Vertical shaft

Rotary

Both B and C

Tunnel

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following accentuates clinker-ing troubles on furnace grate burning coal?

Low forced draft & fuel bed temperature

Low reactivity of carbonised residue containing high proportion of iron & sulphur

All of these

Thick firebed and preheated primary air

TRUE ANSWER : ?
YOUR ANSWER : ?

Ceramic recuperators compared to metallic recuperators for the same duty

Occupy more space

Are lighter

Are less costly

Have higher pressure differential between flue gas & air side

TRUE ANSWER : ?
YOUR ANSWER : ?

The heating capacity of continuous reheating furnace depends upon the

Ratio of wall surface to stock surface

Emissivity of the stock

All of these

Hearth area and furnace temperature

TRUE ANSWER : ?
YOUR ANSWER : ?

The electric furnace in which heat is produced by a combination of induced current and skin effect is called __________ furnace.

Arc

High frequency induction

Resistance

Low frequency induction

TRUE ANSWER : ?
YOUR ANSWER : ?

The method of Lobo and Evans is concerned with the calculation of the

Heat transfer in vacuum condensers

Heat absorption in radiant section of a furnace

Heat transfer by forced convection in a reboiler

Mass transfer co-efficient

TRUE ANSWER : ?
YOUR ANSWER : ?

In a furnace operation, which is not preheated?

Neither A nor B

Solid fuels

Both A and B

Hydrocarbon containing fuel gases (e.g. coke oven gas, refinery gas etc.)

TRUE ANSWER : ?
YOUR ANSWER : ?