Presence of nitrogen in steel___________________?
A. Makes it brittle
B. Increases its strength
C. Increases its hardness
D. Is desirable
Materials and Construction
_____________ of a material results, when its strength is increased & ductility is decreased by heating at a relatively lower temperature after cold working?
_____________ of a material results, when its strength is increased & ductility is decreased by heating at a relatively lower temperature after cold working?
A. Solid solution hardening
B. Screw dislocation
C. Strain ageing
D. Twinning
Beehive coke ovens are made of ________________ bricks?
Beehive coke ovens are made of ________________ bricks?
A. Silica
B. Fireclay
C. Silicon carbide
D. Corundum
Which of the following material of construction may be recommended by a chemical engineer for handling a gaseous chlorine (dry or wet) stream in a fluid flow system ?
Which of the following material of construction may be recommended by a chemical engineer for handling a gaseous chlorine (dry or wet) stream in a fluid flow system ?
A. High silicon iron, silicon rubber, Kel-F and Teflon
B. Mild steel and stainless steel
C. Cast iron, tin and aluminium
D. Copper, nickel and Monel
Lead pipes are not safe for carrying drinking water, because water, containing dissolved oxygen attacks lead thereby forming poisonous Pb(OH)2. Lead pipes are readily corroded by___________________?
Lead pipes are not safe for carrying drinking water, because water, containing dissolved oxygen attacks lead thereby forming poisonous Pb(OH)2. Lead pipes are readily corroded by___________________?
A. Dilute HCl
B. Acetic acid
C. Concentrated H2SO4
D. None of these
Nickel as a material of construction__________________?
Nickel as a material of construction__________________?
A. Is used as an alloying element for both ferrous & non-ferrous alloys
B. Is paramagnetic below 415° C (its Curie temperature)
C. Diamagnetic
D. Has a body centred cubic (bcc) crystal lattice structure
Tin base and lead base alloys are used for bearing materials. Tin compared to lead has lower_________________?
Tin base and lead base alloys are used for bearing materials. Tin compared to lead has lower_________________?
A. Price
B. Corrosion resistance
C. Thermal conductivity
D. Abundant availability
Glass is corroded by________________?
Glass is corroded by________________?
A. Fluorine (dry or wet)
B. Sulphuric acid
C. Phosphoric acid
D. None of these
How many atoms are there per unit cell in a body centred cubic lattice system ?
How many atoms are there per unit cell in a body centred cubic lattice system ?
A. 6
B. 5
C. 3
D. 2
Bush bearings are made of______________________?
Bush bearings are made of______________________?
A. Mild steel
B. Phosphorous bronze
C. White metal alloys
D. None of these