MCQOPTIONS
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MCQOPTIONS
This section includes 614 Mcqs, each offering curated multiple-choice questions to sharpen your GATE (Mechanical Engineering) knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
The hardness of steel depends upon the |
| A. | amount of cementite it contains |
| B. | amount of carbon it contains |
| C. | contents of alloying elements |
| D. | method of manufacture of steel |
| Answer» C. contents of alloying elements | |
| 152. |
Manganese bronze contains more copper than silicon bronze. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 153. |
The addition of manganese to aluminium improves corrosion resistance. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 154. |
Hardness of steel is increased by adding sulphur, lead and phosphorus. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 155. |
Which one of the following sets of constituents is expected in equilibrium cooling of a hyper-eutectoid steel from austenitic state? |
| A. | Ferrite and pearlite |
| B. | Cementite and pearlite |
| C. | Ferrite and bainite |
| D. | Cementite and martensite |
| Answer» C. Ferrite and bainite | |
| 156. |
Which of the following is a mesomorphous material? |
| A. | Mica |
| B. | Silver |
| C. | Lead |
| D. | Brass |
| Answer» B. Silver | |
| 157. |
Incoloy, Hastelloy and Vitallium are __________ temperature alloys. |
| A. | high |
| B. | low |
| C. | Can't say |
| D. | None of these |
| Answer» B. low | |
| 158. |
A steel is heated at about 875° C where the structure consists of entirely austenite. It is then cooled suddenly at a temperature of about 250° C to 525° C. This process of heat treatment is known as |
| A. | normalising |
| B. | annealing |
| C. | austempering |
| D. | martempering |
| Answer» D. martempering | |
| 159. |
Which of the following iron exist between 910° C and 1403° C? |
| A. | α-iron |
| B. | β-iron |
| C. | γ-iron |
| D. | δ-iron |
| Answer» D. δ-iron | |
| 160. |
The austenitic stainless steel contains |
| A. | 18% chromium and 8% nickel |
| B. | 8% chromium and 18% nickel |
| C. | 14% chromium and 0.35% carbon |
| D. | 14% nickel and 0.35% carbon |
| Answer» B. 8% chromium and 18% nickel | |
| 161. |
For the pipe fitting like elbow, tee, union etc., which of the following is preferred? |
| A. | Pig iron |
| B. | Malleable iron |
| C. | Spheroidal graphite cast iron |
| D. | High carbon steel |
| Answer» C. Spheroidal graphite cast iron | |
| 162. |
Pearlite is a combination of 87% ferrite and 13% cementite. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» B. No | |
| 163. |
Duplex process of steel making is a combination of |
| A. | basic bessemer and acid open hearth processes |
| B. | acid bessemer and basic open hearth processes |
| C. | acid bessemer and acid open hearth processes |
| D. | basic bessemer and basic open hearth processes |
| Answer» C. acid bessemer and acid open hearth processes | |
| 164. |
In flame hardening, oxy-acetylene flame is used. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» B. No | |
| 165. |
18/8 stainless steel consists of |
| A. | 18% nickel and 8% chromium |
| B. | 18% chromium and 8% nickel |
| C. | 18% nickel and 18% chromium |
| D. | 8% nickel and 8% chromium |
| Answer» C. 18% nickel and 18% chromium | |
| 166. |
When the steel is normalised, its |
| A. | yield point increases |
| B. | ductility decreases |
| C. | ultimate tensile strength increases |
| D. | all of these |
| Answer» E. | |
| 167. |
Iron-carbon alloys containing carbon __________ 4.3% are known as hyper-eutectic cast irons. |
| A. | equal to |
| B. | less than |
| C. | more than |
| D. | None of these |
| Answer» D. None of these | |
| 168. |
Muntz metal (Yellow brass) contains |
| A. | 70% copper and 30% zinc |
| B. | 60% copper and 40% zinc |
| C. | 59% copper, 40% zinc and 1% tin |
| D. | 60.45% copper, 35.2% zinc and 5.35% nickel |
| Answer» C. 59% copper, 40% zinc and 1% tin | |
| 169. |
Macro-structure of a material is, generally, examined by |
| A. | naked eye |
| B. | optical microscope |
| C. | metallurgical microscope |
| D. | X-ray techniques |
| Answer» B. optical microscope | |
| 170. |
Phosphorus is added in low carbon steels to raise its yield point. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 171. |
According to Indian standard specifications, SG 400/15 means |
| A. | spheroidal graphite cast iron with B.H.N. 400 and minimum tensile strength 15 MPa |
| B. | spheroidal graphite cast iron with minimum tensile strength 400 MPa and 15 percent elongation |
| C. | spheroidal graphite cast iron with minimum compressive strength 400 MPa and 15 percent reduction in area |
| D. | none of the above |
| Answer» C. spheroidal graphite cast iron with minimum compressive strength 400 MPa and 15 percent reduction in area | |
| 172. |
A steel with 0.8% carbon is known as |
| A. | eutectoid steel |
| B. | hyper-eutectoid steel |
| C. | hypo-eutectiod steel |
| D. | none of these |
| Answer» B. hyper-eutectoid steel | |
| 173. |
The steel scrap added in the charge of cupola controls the grade of cast iron produced. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 174. |
Normalising of steel is done to |
| A. | refine the grain structure |
| B. | remove strains caused by cold working |
| C. | remove dislocations caused in the internal structuure due to hot working |
| D. | all of the above |
| Answer» E. | |
| 175. |
Which of the following process of steel making is in operation at Tata Iron and Steel Works, Jamshedpur? |
| A. | Bessemer process |
| B. | Open hearth process |
| C. | Duplex process |
| D. | Electric process |
| Answer» D. Electric process | |
| 176. |
The fuel used in a blast furnace is |
| A. | coal |
| B. | coke |
| C. | wood |
| D. | producer gas |
| Answer» C. wood | |
| 177. |
Steel containing 0.8 to 1.5% carbon, is known as |
| A. | mild steel |
| B. | dead mild steel |
| C. | medium carbon steel |
| D. | high carbon steel |
| Answer» E. | |
| 178. |
In low carbon steels, __________ raises the yield point and improves the resistance to atmospheric corrosion. |
| A. | sulphur |
| B. | phosphorus |
| C. | manganese |
| D. | silicon |
| Answer» C. manganese | |
| 179. |
Steel containing upto 0.15% carbon, is known as |
| A. | mild steel |
| B. | dead mild steel |
| C. | medium carbon steel |
| D. | high carbon steel |
| Answer» C. medium carbon steel | |
| 180. |
In a body centred cubic space lattice, there are nine atoms out of which eight atoms are located at the corners of the cube and one atom at its centre. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» B. No | |
| 181. |
A steel with 0.8% carbon and 100% pearlite is called |
| A. | eutectoid steel |
| B. | hypo-eutectoid steel |
| C. | hyper-eutectoid steel |
| D. | none of these |
| Answer» B. hypo-eutectoid steel | |
| 182. |
When filing or machining cast iron makes our hands black, then it shows that __________ is present in cast iron. |
| A. | cementite |
| B. | free graphite |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 183. |
The type of space lattice found in alpha-iron is |
| A. | face centred cubic space lattice |
| B. | body centred cubic space lattice |
| C. | close packed hexagonal space lattice |
| D. | none of these |
| Answer» C. close packed hexagonal space lattice | |
| 184. |
The casting ability of aluminium increases when __________ is added to aluminium. |
| A. | copper |
| B. | magnesium |
| C. | silicon |
| D. | lead and bismuth |
| Answer» D. lead and bismuth | |
| 185. |
In basic bessemer process, the furnace is lined with |
| A. | silica bricks |
| B. | a mixture of tar and burnt dolomite bricks |
| C. | either (a) or (b) |
| D. | none of these |
| Answer» C. either (a) or (b) | |
| 186. |
The coke in the charge of blast furnace |
| A. | controls the grade of pig iron |
| B. | acts as an iron-bearing mineral |
| C. | supplies heat to reduce ore and melt the iron |
| D. | forms a slag by combining with impurities |
| Answer» D. forms a slag by combining with impurities | |
| 187. |
The dieing down of a white flame during the operation of a bessemer converter indicates that the air is burning out silicon and manganese. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 188. |
The electric process of steel making is especially adopted to |
| A. | alloy and carbon tool steel |
| B. | magnet steel |
| C. | high speed tool steel |
| D. | all of these |
| Answer» E. | |
| 189. |
Nimonic contains __________ percentage of nickel as that of Inconel. |
| A. | same |
| B. | less |
| C. | more |
| D. | None of these |
| Answer» B. less | |
| 190. |
Ball bearings are, usually, made from |
| A. | Low carbon steel |
| B. | High carbon steel |
| C. | Medium carbon steel |
| D. | Chrome steel |
| Answer» E. | |
| 191. |
Connecting rod is, usually, made from |
| A. | Low carbon steel |
| B. | High carbon steel |
| C. | Medium carbon steel |
| D. | High speed steel |
| Answer» D. High speed steel | |
| 192. |
The tensile strength of wrought iron is maximum |
| A. | Along the lines of slag distribution |
| B. | Perpendicular to lines of slag distribution |
| C. | Uniform in all directions |
| D. | None of the above |
| Answer» B. Perpendicular to lines of slag distribution | |
| 193. |
The purpose of heat treatment is to |
| A. | Relieve the stresses set up in the material after hot or cold working |
| B. | Modify the structure of the material |
| C. | Change grain size |
| D. | Any one of these |
| Answer» E. | |
| 194. |
Large forgings, crank shafts, axles normally contain carbon up to |
| A. | 0.05 to 0.20% |
| B. | 0.20 to 0.45% |
| C. | 0.45 to 0.55% |
| D. | 0.55 to 1.0% |
| Answer» D. 0.55 to 1.0% | |
| 195. |
Which of the following has a fine gold colour and is used for imitation jewellery? |
| A. | Silicon bronze |
| B. | Aluminium bronze |
| C. | Gun metal |
| D. | Babbitt metal |
| Answer» C. Gun metal | |
| 196. |
White metal contains |
| A. | 63 to 67% nickel and 30% copper |
| B. | 88% copper and 10% tin and rest zinc |
| C. | Alloy of tin, lead and cadmium |
| D. | Silver and chromium |
| Answer» D. Silver and chromium | |
| 197. |
Shock resisting steels should have |
| A. | Low wear resistance |
| B. | Low hardness |
| C. | Low tensile strength |
| D. | Toughness |
| Answer» E. | |
| 198. |
Chromium when added to steel _________ the tensile strength. |
| A. | Does not effect |
| B. | Decreases |
| C. | Increases |
| D. | None of these |
| Answer» D. None of these | |
| 199. |
The compressive strength of cast iron is __________that of its tensile strength. |
| A. | Equal to |
| B. | Less than |
| C. | More than |
| D. | None of these |
| Answer» D. None of these | |
| 200. |
Hardness of lower bainite (tempered martensite) is about |
| A. | RC 65 |
| B. | RC 48 |
| C. | RC 57 |
| D. | RC 80 |
| Answer» D. RC 80 | |