Pick up the correct statement from the following
In basic Bessemer process, the steel heats the converter
In open-hearth process, the furnace heats the steel
In Siemens process, the impurities of pig iron are oxidised by the oxygen of the ore
all the above
Correct answer is D
No explanation has been provided for this answer.
Vanadium steel is generally used for
railway switches and crossing
bearing balls
magnets
axles and springs
Correct answer is D
No explanation has been provided for this answer.
For filling cracks in masonry structures, the type of bitumen used is
cut-back bitumen
bitumen-emulsion
blown bitumen
plastic bitumen
Correct answer is D
No explanation has been provided for this answer.
For melting one tonne of cast iron
700 m3 air is required
20 kg limestone is required
one quintal coke is required
all the above
Correct answer is D
No explanation has been provided for this answer.
The variety of pig iron used for the manufacture of steel by Bessemer process is
Bessemer pig
Grey pig
White forge pig
Mottled pig
Correct answer is A
No explanation has been provided for this answer.
Initial setting time of cement for asbestos cement products should be not less than
30 minutes
50 minutes
75 minutes
90 minutes
Correct answer is D
No explanation has been provided for this answer.
Varnish is a transparent or semi-transparent solution of resinuous substances in
alcohol
linseed
turpentine
all the above
Correct answer is D
No explanation has been provided for this answer.
The commonly used colour pigment in paints is
ambers
carbon black
iron oxide
lamp black
all the above
Correct answer is E
No explanation has been provided for this answer.
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