MCQOPTIONS
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MCQOPTIONS
This section includes 224 Mcqs, each offering curated multiple-choice questions to sharpen your Metallurgy knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
Bronze is an alloy |
| A. | Copper, lead and tin |
| B. | Copper, zinc and tin |
| C. | Copper, zinc and tin |
| D. | Zinc, nickel and tin |
| E. | Nickel, aluminium and copper |
| Answer» D. Zinc, nickel and tin | |
| 152. |
During heat treatment quenching cracks occur due to |
| A. | irregular martensitic transformation within the article |
| B. | oxidising atmosphere within the fumace |
| C. | heating at higher temperatures for longer durations |
| D. | All of the above |
| E. | Low specific heat of quenching oil |
| Answer» B. oxidising atmosphere within the fumace | |
| 153. |
If the structure of a sample consists of pearlite, cementite and free carbon, the sample may be |
| A. | Cast iron |
| B. | Alloy steel |
| C. | Dead mild steel |
| D. | Eutectoid steel |
| E. | None of the above |
| Answer» B. Alloy steel | |
| 154. |
Welding process used in fabrication of car bodies is |
| A. | Brazing |
| B. | Soldering |
| C. | Thermit welding |
| D. | Arc welding |
| E. | Resistance welding |
| Answer» F. | |
| 155. |
If during spark test, a sample gives dull red sparks, it could be |
| A. | Mild steel |
| B. | Medium carbon steel |
| C. | Cast iron |
| D. | Non-ferrous material |
| E. | Wrought iron |
| Answer» D. Non-ferrous material | |
| 156. |
In eddy current heating of steel, if the depth of heating is to be increased |
| A. | Voltage should be high |
| B. | Some resisting material must be applied on the surface of article to be heated |
| C. | Frequency must be low |
| D. | Time of heating should be high |
| E. | Frequency must be high |
| Answer» D. Time of heating should be high | |
| 157. |
Approximate Brinell Hardness number for talc is |
| A. | 20 -- 30 |
| B. | 1 |
| C. | 5 -- 10 |
| D. | 2 |
| E. | 50 -- 80 |
| Answer» B. 1 | |
| 158. |
Angularity of the square base pyramid in Vickers hardness tester is |
| A. | 90? |
| B. | 11? |
| C. | 120? |
| D. | 150? |
| E. | 136? |
| Answer» F. | |
| 159. |
A steel piece after hardening is heated to 300?C and then cooled in oil. The property imparted to the steel piece will be |
| A. | Hardness |
| B. | Annealing |
| C. | Low specific heat of quenching oil |
| D. | Toughness |
| E. | Softness |
| Answer» E. Softness | |
| 160. |
The process for steel making being used at Rourkela steel plant is |
| A. | Open hearth process |
| B. | L-D process |
| C. | Electric process |
| D. | Bessemmer process |
| E. | Duplex process |
| Answer» C. Electric process | |
| 161. |
Railway rails are made of |
| A. | Mild steel |
| B. | Low carbon steel |
| C. | Medium carbon steel |
| D. | Dead muld steel |
| E. | High carbon steel |
| Answer» F. | |
| 162. |
During dielectric heating, the heat is generated primarily due to |
| A. | Eddy currents |
| B. | High voltage |
| C. | High flux density |
| D. | High power consumption |
| E. | Stray magnetic fields |
| Answer» B. High voltage | |
| 163. |
In high frequency heating of steel, the heat is generated primarily due to |
| A. | Stray magnetic fields |
| B. | High voltage |
| C. | High resistance of contact surface |
| D. | High power |
| E. | Eddy currents |
| Answer» F. | |
| 164. |
Iron ore which is grey to black in colour and is hard and magnetic, is known as |
| A. | Hematite |
| B. | Siderite |
| C. | Ironite |
| D. | Limonite |
| E. | Magnetite |
| Answer» F. | |
| 165. |
Which of the following furnace is used to convert liquid pig iron into steel? |
| A. | Open hearth furnace |
| B. | Cupola |
| C. | Converter |
| D. | Induction arc furnace |
| E. | Low specific heat of quenching oil |
| Answer» D. Induction arc furnace | |
| 166. |
Which of the following temperatures represents the tempering temperature for C 30 steel? |
| A. | 1700?C |
| B. | 100-150?C |
| C. | 1400-1450?C |
| D. | 550-660?C |
| E. | 860-890?C |
| Answer» D. 550-660?C | |
| 167. |
A steel specimen is heated to 730?C and cooled at the slowest possible rate in the furnace. Which property will be imparted to the steel piece? |
| A. | Low specific heat of quenching oil |
| B. | Tempering |
| C. | Softness |
| D. | Toughness |
| E. | Hardness |
| Answer» D. Toughness | |
| 168. |
Electric process for steel making is used in which of the following steel plant? |
| A. | Bhilai |
| B. | Bokaro |
| C. | Durgapur |
| D. | TISCO |
| E. | None of the above |
| Answer» F. | |
| 169. |
High ductility wires are made on |
| A. | Wrought iron |
| B. | Medium carbon steel |
| C. | Cast iron |
| D. | Dead mild steel |
| E. | High carbon steel |
| Answer» E. High carbon steel | |
| 170. |
Which of the following metals has highest specific gravity? |
| A. | Silver |
| B. | Copper |
| C. | Iron |
| D. | Aluminium |
| E. | Brass |
| Answer» B. Copper | |
| 171. |
Crucible for melting of metals are made of |
| A. | Cast iron |
| B. | Chromium |
| C. | Graphite |
| D. | Hard metal |
| E. | Tungsten |
| Answer» D. Hard metal | |
| 172. |
Th phenomenon of emf development between two diferent metals placed in contact is known as |
| A. | Kelvin effect |
| B. | Thomson effect |
| C. | Seeback effect |
| D. | Peltier effect |
| E. | Thermocouple effect |
| Answer» D. Peltier effect | |
| 173. |
The percentage of carbon in cold rolled steel sheets is around |
| A. | 2.10% |
| B. | 0.01% |
| C. | 0.80% |
| D. | 0.10% |
| E. | 1.10% |
| Answer» E. 1.10% | |
| 174. |
The property of a metal when the recovery after unloading is complete but not instantaneous is |
| A. | 9 |
| B. | Viscoelasticity |
| C. | Inelasticity |
| D. | Anelasticity |
| E. | creep |
| Answer» E. creep | |
| 175. |
Carbon percentage in steel for carburizing is usually |
| A. | 0.15 percent |
| B. | 0.6 percent |
| C. | 1 percent |
| D. | 0.8 percent |
| E. | 1.5 percent |
| Answer» B. 0.6 percent | |
| 176. |
As per IS code, C 65 steel will have carbon percentage of |
| A. | 0.065 percent |
| B. | 0.6 to 0.7 percent |
| C. | 6 to 7 percent |
| D. | 00 to 70 percent |
| E. | None of the above |
| Answer» C. 6 to 7 percent | |
| 177. |
Which of the follwing is usually made of mild steel? |
| A. | Drop forgings |
| B. | Fish plates |
| C. | Shear blades |
| D. | Channels |
| E. | Die blocks |
| Answer» E. Die blocks | |
| 178. |
Percentage of carbon in mild steel is |
| A. | 0.010 to 0.025 |
| B. | 1.0 to 1.25 |
| C. | 0.10 to 0.25 |
| D. | 3.0 to 4.50 |
| E. | 0.8 to 0.85 |
| Answer» D. 3.0 to 4.50 | |
| 179. |
Which of the following operation on grey cast iron will result in the production of white cast iron? |
| A. | Rapid heating |
| B. | Tumbling |
| C. | Tempering |
| D. | Shot peening |
| E. | Rapid cooling |
| Answer» B. Tumbling | |
| 180. |
Maximum hardness that can be achieved in plain carbon steel is of the order of |
| A. | There is no such limit for hardness |
| B. | 100 - 150 Rockwell 'C' |
| C. | 66 - 67 Rockwell 'C' |
| D. | 50 Rockwell 'C' |
| E. | 80-85 Rockwell 'C' |
| Answer» D. 50 Rockwell 'C' | |
| 181. |
The minimum carbon percentage required in steel so that it may respond to hardening by heat treatment is |
| A. | 0.02 percent |
| B. | 0.08 percent |
| C. | 0.2 percent |
| D. | 0.8 percent |
| E. | Low specific heat of quenching oil |
| Answer» D. 0.8 percent | |
| 182. |
If a medium carbon hardened steel shows pearlite structure it may be concluded that |
| A. | Steel contains impurities |
| B. | Presence of cementite |
| C. | Steel has been quenched in oil |
| D. | Steel has been quenched in water |
| E. | Steel has been slowly cooled in furnace |
| Answer» F. | |
| 183. |
Austenitic stainless steels contain chromium and nickel in amounts required to assure that even at room temperatures, the steels retain their crystalline structures, which are |
| A. | Face centred cubic |
| B. | Diamond cubic |
| C. | Hexagonal closed-packed |
| D. | Partly amorphous |
| E. | None of the above |
| Answer» B. Diamond cubic | |
| 184. |
Machinability of metal depends on |
| A. | Hardness |
| B. | Hardness and tensile strength |
| C. | Brittleness |
| D. | Brittleness and toughness |
| E. | None of the above |
| Answer» C. Brittleness | |
| 185. |
An operation on steel aimed at softening the steel to improve machinability is known as |
| A. | Annealing |
| B. | Cold working |
| C. | Softening |
| D. | Temperature |
| E. | Shot blasting |
| Answer» B. Cold working | |
| 186. |
High carbon steels intended to be quenched in water should have manganese percentage less than |
| A. | 1.5 percent |
| B. | 0.5 percent |
| C. | 2 percent |
| D. | 1 percent |
| E. | No manganese percent |
| Answer» C. 2 percent | |
| 187. |
Chromium percentage in cutlery stainless steel is |
| A. | 11 - 13 percent |
| B. | 18 - 20.5 percent |
| C. | 6 - 8 percent |
| D. | 15 - 18 percent |
| E. | 8 - 10 percent |
| Answer» F. | |
| 188. |
Carbon percentage in cutlery stainless steel is |
| A. | 1.35 to 1.65 percent |
| B. | 1.1 to 1.35 percent |
| C. | 1 percent |
| D. | 0.76 to 0.80 percent |
| E. | 0.25 to 0.30 percent |
| Answer» F. | |
| 189. |
Which of the following material is added to cast iron to obtain nodular cast iron? |
| A. | Chromium |
| B. | Copper |
| C. | Magnesium |
| D. | Manganese |
| E. | Molybdenum |
| Answer» D. Manganese | |
| 190. |
Which allotropic form of iron does not have body centred cubic lattice? |
| A. | Alpha iron |
| B. | Beta iron |
| C. | Gamma iron |
| D. | Delta iron |
| E. | All of the above |
| Answer» D. Delta iron | |
| 191. |
Which iron ore has least percentage of iron |
| A. | Magnetite |
| B. | Limonite |
| C. | All have almost equal percentage of iron ore |
| D. | Siderite |
| E. | Hematite |
| Answer» E. Hematite | |
| 192. |
The stainless steels owe their resistance to corrosion to the presence of |
| A. | Chromium |
| B. | Carbon |
| C. | Sulphur |
| D. | Manganese |
| E. | Nickel |
| Answer» B. Carbon | |
| 193. |
The tensile strength of nodular iron may be of the order of |
| A. | 500 kg/cm2 |
| B. | 100 kg/cm2 |
| C. | 1000 kg/cm2 |
| D. | 2000 kg/cm2 |
| E. | 4000 kg/cm2 |
| Answer» F. | |
| 194. |
In grey cast iron, free graphite is in the form of |
| A. | Fine powder |
| B. | Needles |
| C. | Nodules |
| D. | Crystals |
| E. | Flakes |
| Answer» F. | |
| 195. |
Standard electrical resistance are made of |
| A. | Invar |
| B. | Manganin |
| C. | Tungsten |
| D. | Phosphor bronze |
| E. | Constantan |
| Answer» F. | |
| 196. |
Which of the following form of iron is produced as a result of annealing of white cast iron? |
| A. | Wrought iron |
| B. | Spheroidal iron |
| C. | Nodular iron |
| D. | Malleable iron |
| E. | Grey iron |
| Answer» E. Grey iron | |
| 197. |
There are 14 atoms in a unit cell of |
| A. | Body centred cubic space lattice |
| B. | Face centred cubic space lattice |
| C. | Close packed hexagonal space lattice |
| D. | All of the above |
| E. | None of the above |
| Answer» C. Close packed hexagonal space lattice | |
| 198. |
The number of atoms per unit cell in BCC is |
| A. | 8 |
| B. | 9 |
| C. | 3 |
| D. | 6 |
| E. | 4 |
| Answer» C. 3 | |
| 199. |
The highest percentage of chrommium that can be added to steel is usually |
| A. | 18 percent |
| B. | 25 percent |
| C. | 15 percent |
| D. | 50 percent |
| E. | 12 percent |
| Answer» B. 25 percent | |
| 200. |
Compressive strength is highest in case of |
| A. | Mild steel |
| B. | Wrought iron |
| C. | High carbon steel |
| D. | Cast iron |
| E. | Low carbon steel |
| Answer» D. Cast iron | |