In reverberatory furnace, charge is heated mainly by

The thermal efficiency of an air/fuel gas preheating recuperator may be as high as __________ percent.

Higher furnace temperature can not be achieved by use of a lean fuel gas in the furnace by

Large tonnage of refractory bricks are dried in a

Thermal efficiency of a limestone calcination rotary kiln may be around __________ percent.

In producer gas making furnace, steam is added along with air to mainly control the

Low stack loss indicates the

Which is a continuous furnace ?

The amount of combustible escaping uncon-sumed from the furnace, depends upon the

Thickness of stock does not affect the fuel economy of furnaces, if the material to be heated is of

An example of a periodic furnace is the

In a muffle furnace, the muffle

Temperature of a furnace fired with low calorific value fuel gas (i.e. lean gas) can be increased by

Pulverised fuel fired furnaces employ __________ fuel firing.

Thermal efficiency of blast furnace stoves used for heating blast (air) may be about __________ percent.

Ceramic recuperators compared to metallic recuperators for the same duty

Ostwald charts are meant for

Which is not a hearth furnace ?

An example of shaft furnace is the

Which of the following is not a directly fired furnace ?

Maximum heat transfer in high temperature furnaces is by

Cement Kiln is a

Dampers are located

In which of the waste heat recovery equipment, the flow of flue gas and air is alternately reversed after a fixed interval of time ?

Test specimen for determination of refractoriness under load (RUL) of a refractory is heated in a

In a furnace employing forced draught as compared to induced draught,

Regenerators are installed in

Protective gas used in the annealing furnace for steel coil comprises of

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

Turndown ratio of a burner gives an idea of the __________ in the furnace.