A. Dry air
B. Pure oxygen
C. Moisture
D. Sunlight
Related Mcqs:
- Midrex process of sponge iron production uses reformed natural gas as the reducing agent, which uses iron ore in the form of_________________?
A. Lumps
B. Pellets
C. Briquettes
D. Sinter - To counteract the bad effects of strain hardening on a cold formed part, it must be ______________________?
A. Tempered
B. Normalised
C. Annealed
D. Hardened - Force between the molecules of the same substance is called ______________________ force?
A. Adhesive
B. Cohesive
C. Molecular
D. Vander Walls - Metal shots used in shot blasting are made of ______________________?
A. Stellite
B. Steel
C. Bronze
D. Lead - Recrystallisation temperature of steel is ______________________ °C?
A. 50
B. 300
C. 500
D. 800 - ______________________ temperature remains constant during adiabatic saturation process of unsaturated air ?
A. Dew point
B. Dry bulb
C. Wet bulb
D. None of these - ______________________ iron is produced by the annealing of white cast iron?
A. Malleable
B. Nodular
C. Ductile
D. Grey - The main constituent of bones is ______________________?
A. CaF2
B. Ca3(PO4)2
C. CaCO3
D. CaCl2 - Transformer cores are normally made from ______________________?
A. Soft ferrites
B. High purity iron
C. Grain oriented Fe-Si alloy
D. Al-Ni-Co alloy - Function of fusible plug in a boiler is to ______________________?
A. Drain out water and sludge from the boiler during repair
B. Put off fire in the furnace when water level in the boiler falls to unsafe limit
C. Guard the boiler in case of abnormal rise in steam pressure
D. All A, B. & C
