__________ of grey cast iron produces white cast iron.
(A) Tempering
(B) Rapid heating
(C) Rapid cooling
(D) Slow cooling

1 Answer

Answer :

Option B

Related questions

Description : Annealing of white cast iron produces __________ iron. (A) Grey (B) Nodular (C) Malleable (D) Spheroidal

Last Answer : (C) Malleable

Description : Heating the Hypo-eutectoid steels to 30°C above the upper critical temperature line, soaking at that temperature and then cooling slowly to the room temperature to form a pearlite & ferrite structure is called (A) Tempering (B) Hardening (C) Annealing (D) Normalising

Last Answer : Option C

Description : __________ iron is produced, when molten pig iron is chilled suddenly. (A) White cast (B) Grey cast (C) Wrought (D) None of these

Last Answer : (A) White cast

Description : __________ iron is produced, when molten pig iron is allowed to cool gradually. (A) White cast (B) Grey cast (C) Wrought (D) None of these

Last Answer : (B) Grey cast

Description : __________ iron is produced by the annealing of white cast iron. (A) Malleable (B) Nodular (C) Ductile (D) Grey

Last Answer : (A) Malleable

Description : White cast iron as compared to grey cast iron is (A) More durable (B) Very brittle (C) Very hard (D) All (A), (B) & (C)

Last Answer : (D) All (A), (B) & (C)

Description : Which one has the maximum tensile strength out of the following? (A) Nodular cast iron (B) Pig iron (C) White cast iron (D) Grey cast iron

Last Answer : (A) Nodular cast iron

Description : Out of the following, the best material capable of withstanding shock & vibration without the danger of cracking is (A) Malleable iron (B) Grey cast iron (C) Chilled cast iron (D) White cast iron

Last Answer : Option A

Description : Carbon is present in the form of __________ in grey cast iron. (A) Spheroids (B) Nodular aggregates of graphite (C) Flakes

Last Answer : Option C

Description : Addition of small amount of __________ to grey cast iron is done to produce nodular grey cast iron. (A) Manganese (B) Phosphorous (C) Magnesium (D) Chromium

Last Answer : Option C

Description : The cast iron when heated to red heat with powdered red haematite in an oven for increasing its toughness, is converted to (A) Grey cast iron (B) White cast iron (C) Mottled cast iron (D) Toughed cast iron

Last Answer : Answer: Option C

Description : Cupola produces __________ iron. (A) Pig (B) Cast (C) Wrought (D) Carbon free

Last Answer : (B) Cast

Description : Pick out the wrong statement. (A) Wrought iron contains about 0.02% carbon (B) Wrought iron cannot be easily forged and welded (C) The chilled cast iron does not contain graphite (D) Spheroidal grey cast iron contains graphite flakes

Last Answer : (B) Wrought iron cannot be easily forged and welded

Description : Oxyacetylene reducing flame is used while carrying out welding on (A) Alloy steel (B) Grey cast iron (C) Mild steel (D) High carbon steel

Last Answer : (C) Mild steel

Description : Oxyacetylene reducing flame is used while carrying out welding on (A) Alloy steel (B) Grey cast iron (C) Mild steel (D) High carbon steel

Last Answer : Option C

Description : Which material is suitable for shaft material? a. High speed steel b. Stainless steel or high carbon steel c. Grey cast iron d. Steel having approx. 0.4% carbon and 0.8% manganese

Last Answer : d. Steel having approx. 0.4% carbon and 0.8% manganese

Description : ______is extensively used for those portions of magnetic circuit which carry steady flux and need superior mechanical properties ? (a) Grey cast-iron (b) Cast steel (c) High carbon steel (d) Stainless steel

Last Answer : (b) Cast steel

Description : Out of the following __________ iron has the best capability to bear sudden & excessive shocks. (A) White (B) Cast (C) Wrought (D) Pig

Last Answer : (C) Wrought

Description : Magnetic permeability of iron is increased by its (A) Decarburising (B) Alloying with cobalt (C) Purification (D) Alternate heating & cooling

Last Answer : Option B

Description : Spheroidising of a material is a/an __________ process. (A) Normalising (B) Annealing (C) Tempering (D) Hardening

Last Answer : (B) Annealing

Description : __________ of hard alloy and tool steel is done to make it easily machinable. (A) Case carburising (B) Tempering (C) Normalising (D) Annealing

Last Answer : (B) Tempering

Description : Elimination of brittleness resulting from welding of saw blades is done by __________ of the welded portion. (A) Annealing (B) Toughening (C) Work hardening (D) Tempering

Last Answer : (A) Annealing

Description : The expression for entropy change, ΔS = n Cp. ln (T2/T1), is valid for the __________ of a substance. (A) Simultaneous pressure & temperature change (B) Heating (C) Cooling (D) Both (B) and (C)

Last Answer : (D) Both (B) and (C)

Description : __________ paint has the maximum absorption coefficient. (A) Black (B) Yellow (C) White (D) Grey

Last Answer : (A) Black

Description : __________ paint has the minimum absorption co-efficient. (A) Black (B) White lead (C) Grey (D) Light cream

Last Answer : (B) White lead

Description : Stefan-Boltzmann law applies to __________ body. (A) Black (B) White (C) Grey (D) Any colour

Last Answer : (A) Black

Description : A colourless water-soluble compound on strong heating liberates a brown colored gas and leaves a yellow residue that turns white on cooling. An aqueou

Last Answer : A colourless water-soluble compound on strong heating liberates a brown colored gas and leaves a yellow residue that turns ... (3))_(3)` D. `NaNO_(3)`

Description : On heating, a white amorphous inorganic compound becomes yellow and on cooling, turns white again. The salt may be

Last Answer : On heating, a white amorphous inorganic compound becomes yellow and on cooling, turns white again. The salt may be A. ... `ZnCO_(3)` D. `K_(2)CO_(3)`

Description : Heating of __________ to 120°C, produces plaster of paris. (A) Blue vitriol (B) Gypsum (C) Calcium silicate (D) Calcium sulphate

Last Answer : (B) Gypsum

Description : Explain the difference between grey iron and white iron. What is mottled iron ?

Last Answer : The carbon in cast iron could exist at room temperature as either iron carbide, or as graphite which is the more stable form. Irons containing carbon as graphite are soft, easily ... equal proportions of graphite and iron carbide have intermediate hardness and are called mottled irons.

Description : Pig iron obtained from the furnace which is properly provided with fuel at a very high temperature, is called (A) Bessemer pig (B) Grey or foundry pig (C) White or forge pig (D) Mottled pig

Last Answer : Answer: Option B

Description : For light and ornamental casting, the most unsuitable pig iron, is (A) Bessemer pig (B) Grey or foundry pig (C) White or forge pig (D) Mottled pig

Last Answer : Answer: Option D

Description : The variety of pig iron used for the manufacture of steel by Bessemer process, is (A) Bessemer pig (B) Grey pig (C) White forge pig (D) Mottled pig

Last Answer : Answer: Option A

Description : If the furnace is provided with insufficient fuel at low temperatures, the type of pig iron produced, is called (A) Bessemer pig (B) Grey or foundry pig (C) White or forge pig (D) Mottled pig

Last Answer : Answer: Option C

Description : The variety of pig iron used for manufacture of wrought iron, is (A) Bessemer pig (B) Grey or foundry pig (C) White forge pig (D) Mottled pig

Last Answer : Answer: Option C

Description : Pig iron made from haematite ores free from sulphur, phosphorus and copper, is known as (A) Bessemer pig (B) Grey or foundry pig (C) White or forge pig (D) Mottled pig

Last Answer : Answer: Option A

Description : The hyperboloid shape also aids in accelerating the upward convective air flow, improving __________ efficiency. a. Heating b. Warming c. Cooling d. Cold

Last Answer : c. Cooling

Description : Which of the following has the least carbon percentage? (A) Low carbon steel (B) Mild steel (C) Wrought iron (D) White cast iron

Last Answer : (C) Wrought iron

Description : White cast iron is not (A) Malleable (B) Whitish in color (C) Brittle (D) Strong and hard

Last Answer : (A) Malleable

Description : Portland cement manufactured from pure white chalk and clay but free from iron-oxide, is known as (A) Quick setting cement (B) Rapid hardening cement (C) White cement (D) Low heat Portland cement

Last Answer : Answer: Option C

Description : __________ balls capable of grinding the feed in a ball mill gives the maximum efficiency. (A) Cast iron (B) Minimum size (C) Maximum size (D) Elliptical

Last Answer : (B) Minimum size

Description : Cast iron and steel pipes are produced by __________ casting. (A) Die (B) Investment (C) Slush (D) True centrifugal

Last Answer : (D) True centrifugal

Description : Caustic soda can be stored in __________ drums. (A) Steel (B) Cast iron (C) Brass (D) Gun metal

Last Answer : (A) Steel

Description : Acetaldehyde is shipped in __________ drums. (A) Cast iron (B) Steel (C) Aluminium (D) Either (B) & (C)

Last Answer : (D) Either (B) & (C)

Description : Cast iron is a __________ material. (A) Brittle (B) Ductile (C) Tough (D) Malleable

Last Answer : (A) Brittle

Description : Cast iron detachable joint is used in __________ pipes. (A) Steel (B) Cast iron (C) Asbestos cement (D) Reinforced cement concrete

Last Answer : (A) Steel

Description : Aqueous nitric acid is stored in __________ vessel. (A) Plain carbon steel (B) Stainless steel (C) Cast iron (D) Thermosetting plastic material

Last Answer : (C) Cast iron

Description : Maximum carbon content in cast iron is __________ percent. (A) 3.8 (B) 5.2 (C) 4.8 (D) 4.3

Last Answer : (D) 4.3

Description : __________ iron is the purest form of iron. (A) Cast (B) Wrought (C) Pig (D) High silicon

Last Answer : (B) Wrought

Description : Lead is poured into the joint between two- __________ pipes. (A) Mild steel (B) Concrete (C) Cast iron (D) Asbestos cement

Last Answer : (C) Cast iron