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.