Description : Carbon content in steel is __________ percent. (A) 0.1-2 (B) 4-6 (C) 2-4 (D) 0.001-0.01
Last Answer : (A) 0.1-2
Description : With increasing carbon percent in steel beyond 0.8%, its ultimate tensile strength (UTS) and __________ is not affected. (A) Impact strength (B) Percent elongation (C) Hardness (D) Both 'b' & 'c'
Last Answer : (A) Impact strength
Description : The minimum carbon content in steel should be __________ percent for it to respond to a hardening treatment. (A) 0.2 (B) 0.4 (C) 0.6 (D) 0.8
Last Answer : Option A
Description : Cold cracking in the heat affected zone of a high strength steel weld can take place because of the (A) Retained austenite (B) Martensite formation (C) Relatively high sulphur content in the base metal (D) Sufficient hydrogen present in the welding arc
Last Answer : (B) Martensite formation
Description : Steels with high carbon equivalent have poor Weldability, because in these steels during welding (A) Carbon and other alloying elements get oxidised from the weld pool (B) Excessive ferrite forms in the ... of carbon and other element occurs in the weld pool leading to poor properties of the weld
Last Answer : (C) Martensite forms in the heat affected zone leading to poor toughness/ductility of the weld
Description : Eutectoid composition of carbon steel at room temperature is (A) Cementite (B) Pearlite (C) Martensite (D) Ferrite
Last Answer : Option B
Description : Transformation range for ferrous material is the temperature interval during which __________ is formed during its heating. (A) Cementite (B) Austenite (C) Martensite (D) Pearlite
Description : Steel will respond to hardening by heat treatment processes, only when the minimum carbon content in it is __________ percent. (A) 0.02 (B) 0.2 (C) 0.35 (D) 0.5
Last Answer : (B) 0.2
Description : Carbon content in plain carbon steel is __________ percent. (A) 0.1 to 0.15 (B) 0.35 to 0.45 (C) 0.65 to 0.80 (D) 0.85 to 1.2
Last Answer : (B) 0.35 to 0.45
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 : Maximum permissible sulphur content in steel is __________ percent. (A) 0.015 (B) 0.055 (C) 0.505 (D) 0.805
Last Answer : (B) 0.055
Description : Maximum permissible sulphur content in steel is __________ percent. (A) 0.015 (B) 0.055 (C) 0.505
Description : The difference in one unit of Rockwell hardness number corresponds to a difference in the depth of indentation of __________ mm. (A) 0.001 (B) 0.01 (C) 0.002 (D) 0.02
Last Answer : Option C
Description : Increasing the carbon content of steel (A) Reduces the upper shelf energy (B) Increasing the ductility transition temperature (C) Decreases brittleness (D) Decreases hardness
Last Answer : (B) Increasing the ductility transition temperature
Description : Primary designation of steel is based on its (A) Hardness & tensile strength (B) Carbon content (C) Iron content (D) Alloying elements content
Last Answer : (D) Alloying elements content Sh
Description : High carbon steel contains more than __________ percent carbon. (A) 0.5 (B) 2.2 (C) 2.5 (D) 2.8
Last Answer : (A) 0.5
Description : A hardened steel essentially contains (A) Sorbite (B) Troostite (C) Martensite (D) None of these
Last Answer : (C) Martensite
Description : Austempering of steel requires it to be heated to 875°C followed by sudden cooling to 250-525°C, thereby changing austenite to (A) Sorbite (B) Bainite (C) Martensite (D) Troostite
Last Answer : (B) Bainite
Description : Sub zero treatment of steel is done to (A) Suppress martensite transformation (B) Enhance its working performance in sub zero atmosphere (C) Reduce the retained austenite in hardened steel (D) Induce temper brittleness after its hardening
Description : Brownian movement is prominent in the particle size range of __________ microns in case of settling of a particle in a fluid. (A) 2 to 3 (B) 0.01 to 0.10 (C) 200 to 300 (D) 100 to 1000
Last Answer : A) 2 to 3
Description : Explain the formation of micro structures of pearlite, bainite and martensite in steel.
Last Answer : If austenite containing about 0.80 percent carbon is slowly cooled through the critical temperature, ferrite and cementite are rejected simultaneously, forming alternate plates or lamellae. This ... This phase has a tetragonal crystal structure and contains carbon in supersaturated solid solution.
Description : The range of Mho's scale of hardness is from (A) 1 to 15 (B) 1 to 8 (C) 1 to10 (D) 0 to 10
Last Answer : (C) 1 to10
Description : Maximum heat dissipation occurs from a steel wire (k = 0.5 W/m. k) of 15 mm diameter exposed to air (h = 20W/m2.k), when the insulation thickness is __________ mm. (A) 15 (B) 25 (C) 10 (D) 30
Last Answer : (B) 25
Description : Carbon Content by weight in air dried wood may be about __________ percent. (A) 10 (B) 25 (C) 50 (D) 80
Last Answer : (C) 50
Description : Maximum permissible residual chlorine in treated water should be __________ mg/litre. (A) 0.001 to 0.01 (B) 0.2 to 0.3 (C) 2 to 3 (D) 5 to 10
Last Answer : (B) 0.2 to 0.3
Description : Maximum carbon content in any variety of steel can be upto 1.3%. Steel containing 0.4% Carbon is not used for making (A) Nuts (B) Bolts (C) Chisels
Last Answer : (C) Chisels
Description : Hard steel contains – (1) 2 to 5 per cent carbon (2) 0.5 to 1.5 per cent carbon (3) 0.1 to 0.4 per cent carbon (4) 0.01 to 0.04 per cent carbon
Last Answer : (2) 0.5 to 1.5 per cent carbon Explanation: The term hardened steel is often used for a medium or high carbon steel that has been given the heat treatments of quenching followed by ... In contrast, the same steel composition in annealed state will be softer as required for forming and machining.
Description : Hard steel contains (1) 2 to 5 per cent carbon (2) 0.5 to 1.5 per cent carbon (3) 0.1 to 0.4 per cent carbon (4) 0.01 to 0.04 per cent carbon
Last Answer : 0.5 to 1.5 per cent carbon
Description : Cast irons are generally specified by their (A) Carbon content (B) Tensile strength (C) Hardness (D) Manufacturing process
Last Answer : (B) Tensile strength
Description : Range of compressibility co-efficient of the commercial compressible cake obtained in filtration operation is (A) 0.01 to 0.1 (B) 0.1 to 0.3 (C) 0.2 to 0.8 (D) 0.2 to 0.4
Last Answer : (C) 0.2 to 0.8
Description : With increase in the carbon percentage in the steel, its (A) Hardness increases (B) Ductility reduces (C) Tensile strength increases (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : Pick out the wrong statement. (A) Addition of methane to the furnace atmosphere reduces decarburising by hydrogen (B) Nitrogen in presence of steam decor-burises high carbon steel, whereas hydrocarbon ... the metal surface) cause nitride formation with increase in surface hardness (D) None of these
Last Answer : (D) None of these
Description : Pick out the wrong statement. (A) Both annealing and normalising release the internal stresses of the material besides improving the mechanical properties (B) Low carbon steel does not respond to ... are also used for surface hardening (D) Martempering of a material is a hardening process
Description : Alcohol content in freshly prepared natural and fortified wine may be respectively around __________ percent. (A) 7-14 and 14-30 (B) 7-14 and 40-50 (C) 14 - 30 and 40-50 (D) 10 - 20 and 40 - 50
Last Answer : (A) 7-14 and 14-30
Description : Carbon content of pitch (residue of coal tar distillation) is around __________ percent. (A) 70 (B) 55 (C) 80 (D) 94
Last Answer : (D) 94
Description : Dead mild steel, which contains 0.10 to 0.15 percent carbon is used for making (A) Shafts (B) Flanges (C) Gears (D) Shear blades
Last Answer : (B) Flanges
Description : The optimum moisture content in solids to be crushed/ground ranges from __________ percent. (A) 3 to 4 (B) 8 to 10 (C) 10 to 15 (D) 15 to 20
Last Answer : (A) 3 to 4
Description : Stoke's equation is valid in the Reynolds number range (A) 0.01 to 0.1 (B) 0.1 to 2 (C) 2 to 10 (D) 10 to 100
Last Answer : (A) 0.01 to 0.1
Description : Solid content in most of the domestic sewage is about __________ percent. (A) 0.001 (B) 0.1 (C) 5 (D) 10
Last Answer : (B) 0.1
Description : The ratio of working capital to total capital investment for most chemical plants (except for non-seasonal based products) is in the range of __________ percent. (A) 0.1 to 1 (B) 1 to 2 (C) 10 to 20 (D) 50 to 60
Last Answer : (C) 10 to 20
Description : Addition of __________ in steel can help in increasing the depth of hardness. (A) Nickel (B) Chromium (C) Vanadium (D) Tungsten
Last Answer : (D) Tungsten
Description : Addition of __________ in steel is helpful in increasing the depth of hardness. (A) Chromium (B) Sulphur (C) Vanadium (D) Tungsten
Last Answer : (A) Chromium
Description : High speed steel tools retain their hardness upto a temperature of __________ °C. (A) 500 (B) 750 (C) 900 (D) 1100
Last Answer : (C) 900
Description : The ability of tool steel to resist softening at high temperatures is termed as __________ hardness. (A) Red (B) Extended (C) Super (D) Extreme
Last Answer : (C) Super
Description : Addition of __________ to steel does not impart hardness. (A) Nickel (B) Copper (C) Chromium (D) Silicon
Last Answer : : Option B
Description : Maximum hardenability of steel depends upon its (A) Chemical composition (B) Carbon content (C) Grain size (D) Alloying elements content
Last Answer : Option D
Description : Percentage of carbon content in mild steel is (A) Less than 0.25 (B) Between 0.25 and 0.7 (C) Between 0.7 and 1.5 (D) Greater than 1.5
Last Answer : Answer: Option A