Coke oven gas after passing through return electrostatic tar precipitator (RETP) is used for the_______________? A. Hot scarfing of steel slabs B. Mixing with blast furnace gasC. Coke oven battery heating D. Steel ladle drying

Benzene is used__________________? A. As a motor fuel B. As an explosiveC. For making insecticides (e.g., DDT, BHC etc.), detergent & rubber (SBR) D. As a perfume

Which of the following constituents of a fuel does not contribute to its calorific value on combustion ? A. Hydrogen B. Sulphur C. CarbonD. None of these

High temperature carbonisation of coal produces__________________? A. Inferior coke compared to low temperature carbonisation B. Less of gases compared to liquid products C. Large quantity of tar compared to low temperature carbonisationD. None of these

Gobar gas constitutes mainly of___________________? A. CH4 & CO2 B. CO & CO2 C. CH4 & N2 D. CO & N2

Which of the following coal gasification processes will produce gas having maximum methane content ? A. Winkler processB. Lurgi process C. Kopper-Totzek process D. All can produce same methane content

During the carbonisation of coal__________________? A. All tar is evolved at 700°C C. Hard semi-coke starts shrinking at 600°CD. All A., B. and C.

A coal that softens and fuses on heating is_________________? A. Classified B. CarbonisedC. Caking D. Non-caking

Main use of soft coke is as _______________ fuel? A. Domestic B. Blast furnace C. Foundry D. None of these

Gas yield in the Kopper-Totzek coal gasifier is about ______________ Nm3/ton coal (ash = 35%)? A. 150B. 1500 C. 3500 D. 5000