chemical engineering materials and construction Mcqs
451. Hardened steel is softened by___________________?
comments icon0

A. Normalising

B. Carburising

C. Tempering

D. Annealing

452. Metalloid is_______________________?
comments icon0
A. An element, which exhibits the properties of both metal & non metal

B. Highly electronegative in nature

C. An alloy

D. All A., B. & C.

453. Which of the following is the softest material ?
comments icon0
A. Calcite

B. Quartz

C. Corundum

D. Fluorite

454. Tin base and lead base alloys are used for bearing materials. Tin compared to lead has lower_________________?
comments icon0

A. Thermal conductivity

B. Corrosion resistance

C. Abundant availability

D. Price

455. Lead pipe is_____________________?
comments icon0

A. rmal strain

B. Having very low elastic limit resulting in permanent deformation from either mechanical or

C. Usually joined by burning (e.g. by melting to adjacent pieces with a torch)

D. All A., B. and C.

E. Especially resistant to solutions containing H2SO4

457. Which one occupies the lowermost position in the electromotive series of metals ?
comments icon0
A. Noble metals (Ag, Pt, Au)

B. Zinc

C. Aluminium

D. Alkali metals (K, Na, Li)

458. Ceramic materials fabrication cannot be done by__________________?
comments icon0

A. Plastic pressing

B. Extrusion

C. Slip casting

D. Welding
459. Lead lined equipments & vessels are suitable for handling __________________?
comments icon0
A. Sulphuric acid upto 60C

B. All A., B. and C.

C. Hydrochloric acid (10%)

D. Nitric acid

461. Gun metal is an alloy of_________________________?
comments icon0

A. Manganese, phosphorus and nickel

B. Nickel, tin and copper

C. Copper, phosphorus and nickel

D. Copper, tin and zinc
463. Chilled iron castings are__________________?
comments icon0

A. None of these

B. Soft on surface

C. Highly wear resistant

D. Easily machinable

464. Corrosion involves exchange of electrons in ____________ corrosion?
comments icon0

A. Chemical

B. Electrochemical

C. Both A. & B.

D. Neither A. nor B.

467. High speed steel should have high___________________?
comments icon0

A. Toughness

B. Wear resistance

C. Hardenability

D. Both B. & C.
470. Combination of metals and ceramics are called___________________?
comments icon0

A. Metalloy

B. Cermets

C. Non-crystalline ceramics

D. Pellets

473. Wrought iron is a suitable material of construction for handling _____________ solutions?
comments icon0

A. None of these

B. Concentrated acidic

C. Alkalis & alkaline

D. Dilute acidic

474. Steel pipes are normally manufactured by ______________ process?
comments icon0
A. Extrusion

B. Electroforming

C. Cold working

D. Forging

475. Cast iron compared to steel is better in__________________?
comments icon0

A. Strength

B. Ductility

C. Fluidity & castability

D. Malleability

476. Hastelloy comprises of____________________?
comments icon0

A. Copper and tin

B. Molybdenum and nickel

C. Copper and nickel

D. Lead and tin

478. Maximum consumption of copper is in__________________?
comments icon0

A. Utensil manufacture

B. Small scale industries

C. Electrical industry

D. Industrial equipment manufacture

480. In cold working of metal as compared to its hot working____________________?
comments icon0

A. Ductility and impact strength improves

B. Yield stress, hardness and fatigue strength is not at all affected

C. Appreciable strain hardening is produced

D. Cracks and blow holes are eliminated

482. When iron is rusted, it is__________________?
comments icon0

A. Reduced

B. None of these

C. Converted to a fine powder

D. Oxidised
484. Galvanising is generally done on___________________?
comments icon0

A. Cast iron

B. Low carbon steel

C. Non-ferrous metals

D. Stainless steel

485. Which one has the maximum tensile strength out of the following ?
comments icon0

A. White cast iron

B. Pig iron

C. Nodular cast iron

D. Grey cast iron

486. Age hardening is concerned with_________________?
comments icon0
A. Duralumin

B. Silver

C. Brass

D. Copper

487. Addition of lead, sulphur and phosphorus to low carbon steel helps in improving its__________________?
comments icon0

A. Compressive strength

B. Corrosion resistance

C. Tensile strength

D. Machinability
488. Rotary kilns in cement industry are lined with _____________bricks?
comments icon0

A. Silica

B. Lead

C. Fireclay

D. High alumina & high magnesia
490. Presence of nitrogen in steel___________________?
comments icon0

A. Increases its hardness

B. Increases its strength

C. Makes it brittle

D. Is desirable

491. Very high sulphur in pig iron makes ___________________?
comments icon0

A. Its hard and machinable

B. Its casting unsound

C. Its brittle and malleable

D. All A., B. & C.

492. Cast iron detachable joint is used in __________ pipes.
comments icon0

A. Cast iron

B. Reinforced cement concrete

C. Steel

D. Asbestos cement

494. Age hardening of duralumin is due to____________________?
comments icon0

A. Copper

B. Magnesium

C. Both A. & B.

D. Neither A. nor B.

495. Condenser tubes are not made of_________________?
comments icon0

A. Cartridge brass

B. Aluminium brass alloy

C. Wood metal

D. Muntz brass

496. The material of construction of bearings is__________________?
comments icon0

A. Steel

B. Pig iron

C. Cast iron

D. Babbitt metal