MCQOPTIONS
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MCQOPTIONS
This section includes 482 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
Cartidge brass can be |
| A. | cold rolled into sheets |
| B. | drawn into wires |
| C. | formed into tube |
| D. | any one of these |
| Answer» E. | |
| 152. |
Blast furnace is used to produce |
| A. | pig iron |
| B. | cast iron |
| C. | wrought iron |
| D. | steel |
| Answer» B. cast iron | |
| 153. |
The steel scrap added in the charge of cupola controls the grade of cast iron produced. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 154. |
Which of the following metal is used for nuclear energy? |
| A. | Uranium |
| B. | Thorium |
| C. | Niobium |
| D. | all of these |
| Answer» E. | |
| 155. |
Tin base white metals are used where the bearings are subjected to |
| A. | large surface wear |
| B. | elevated temperatures |
| C. | light load and pressure |
| D. | high pressure and load |
| Answer» B. elevated temperatures | |
| 156. |
Shock resistance of steel is increased by adding |
| A. | nickel |
| B. | chromium |
| C. | nickel and chromium |
| D. | sulphur, lead and phosphorus |
| Answer» D. sulphur, lead and phosphorus | |
| 157. |
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 | |
| 158. |
A steel containing ferrite and pearlite is |
| A. | hard |
| B. | soft |
| C. | tough |
| D. | hard and tough |
| Answer» C. tough | |
| 159. |
The defect which takes place due to imperfect packing of atoms during crystallisation is known as |
| A. | line defect |
| B. | surface defect |
| C. | point defect |
| D. | none of these |
| Answer» D. none of these | |
| 160. |
The upper critical point varies according to the carbon content in steel. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 161. |
A steel containing 16 to 18% chromium and about 0.12% carbon is called |
| A. | ferritic stainless steel |
| B. | austenitic stainless steel |
| C. | martensitic stainless steel |
| D. | nickel steel |
| Answer» B. austenitic stainless steel | |
| 162. |
The alloy, mainly used for corrosion resistance in stainless steels is |
| A. | silicon |
| B. | manganese |
| C. | carbon |
| D. | chromium |
| Answer» E. | |
| 163. |
In process annealing, the hypo-eutectoid steel is |
| A. | heated from 30° C to 50° C above the upper critical temperature and then cooled in still air |
| B. | heated from 30° C to 50° C above the upper critical temperature and then cooled suddenly in a suitable cooling medium |
| C. | heated from 30° C to 50° C above the upper critical temperature and then cooled slowly in the furnace |
| D. | heated below or close to the lower critical temperature and then cooled slowly |
| Answer» E. | |
| 164. |
Delta-iron occurs between the temperature range of |
| A. | 400°C to 600°C |
| B. | 600°C to 900°C |
| C. | 900°C to 1400°C |
| D. | 1400°C to 1530°C |
| Answer» E. | |
| 165. |
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 | |
| 166. |
White cast iron has |
| A. | carbon in the form of carbide |
| B. | low tensile strength |
| C. | high compressive strength |
| 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 |
| Answer» D. | |
| 168. |
The steel produced by cementation process is known as __________ steel. |
| A. | blister |
| B. | crucible |
| Answer» B. crucible | |
| 169. |
Duralumin has better strength than Y-alloy at high temperature. |
| A. | True |
| B. | False |
| Answer» C. | |
| 170. |
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. | |
| 171. |
A steel containing 12 to 14% chromium and 0.12 to 0.35% carbon is called martensitic stainless steel. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 172. |
When a steel containing __________ 0.8% carbon is cooled slowly below the lower critical point, it consists of ferrite and pearlite. |
| A. | equal to |
| B. | less than |
| C. | more than |
| Answer» C. more than | |
| 173. |
Duralumin contains |
| A. | 3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium |
| B. | 3.5 to 4.5% copper, 1.2 to 1.7% managanese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium |
| C. | 4 to 4.5% magnesium, 3 to 4% copper and rest aluminium |
| D. | 5 to 6% tin, 2 to 3% copper and rest aluminium |
| Answer» B. 3.5 to 4.5% copper, 1.2 to 1.7% managanese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium | |
| 174. |
Age hardening is related to |
| A. | duralumin |
| B. | brass |
| C. | copper |
| D. | silver |
| Answer» B. brass | |
| 175. |
The addition of which of the following improves machining of copper? |
| A. | Sulphur |
| B. | Vanadium |
| C. | Tin |
| D. | Zinc |
| Answer» B. Vanadium | |
| 176. |
When a medium carbon steel is heated to coarsening temperature, |
| A. | there is no change in grain size |
| B. | the average grain size is a minimum |
| C. | the grain size increases very rapidly |
| D. | the grain size first increases and then decreases very rapidly |
| Answer» D. the grain size first increases and then decreases very rapidly | |
| 177. |
Phosphorus is added in low carbon steels to raise its yield point. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 178. |
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 | |
| 179. |
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) | |
| 180. |
Polyvinylchloride (PVC) is a __________ material. |
| A. | thermoplastic |
| B. | thermosetting |
| Answer» B. thermosetting | |
| 181. |
In a unit cell of close packed hexagonal space lattice, there are twenty four atoms. |
| A. | Correct |
| B. | Incorrect |
| Answer» C. | |
| 182. |
The stiffness is the ability of a material to resist deformation under stress. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 183. |
The acidic bessemer process is suitable for producing steel from pig iron containing large quantities of phosphorus. |
| A. | Correct |
| B. | Incorrect |
| Answer» C. | |
| 184. |
In low carbon steels, presence of small quantities of sulphur improves |
| A. | weldability |
| B. | formability |
| C. | machinability |
| D. | hardenability |
| Answer» D. hardenability | |
| 185. |
Cast iron is used in those parts which are subjected to shocks. |
| A. | Correct |
| B. | Incorrect |
| Answer» C. | |
| 186. |
The aluminium alloy made by melting aluminium with 2 to 10% magnesium and 1.75% copper is called |
| A. | duralumin |
| B. | Y-alloy |
| C. | magnalium |
| D. | hindalium |
| Answer» D. hindalium | |
| 187. |
The ability of a material to resist fracture due to high impact loads, is called |
| A. | strength |
| B. | stiffness |
| C. | toughness |
| D. | brittleness |
| Answer» D. brittleness | |
| 188. |
In the middle part of the blast furnace (zone of absorption), the temperature is |
| A. | 400° to 700°C |
| B. | 800°C to 1000°C |
| C. | 1200°C to 1300°C |
| D. | 1500°C to 1700°C |
| Answer» C. 1200°C to 1300°C | |
| 189. |
The temperature in the upper part of the blast furnace (zone of reduction) is __________ that of the middle part. |
| A. | equal to |
| B. | less than |
| C. | more than |
| Answer» C. more than | |
| 190. |
In full annealing, the hypo-eutectoid steel is heated from 30° C to 50° C above the upper critical temperature and then cooled |
| A. | in still air |
| B. | slowly in the furnace |
| C. | suddenly in a suitable cooling medium |
| D. | any one of these |
| Answer» C. suddenly in a suitable cooling medium | |
| 191. |
A cold chisel is made of_______________? |
| A. | mild steel |
| B. | cast iron |
| C. | H.S.S. |
| D. | high carbon |
| Answer» E. | |
| 192. |
Amorphous material is one%! |
| A. | In which atoms align themselves in a geometric pattern upon solidification |
| B. | In which there is no definite atomic structure and atoms exist in a random pattern just as in a liquid |
| C. | Which is not attacked by phosphorous |
| D. | Which emits fumes on melting |
| Answer» C. Which is not attacked by phosphorous | |
| 193. |
A reversible change in the atomic structure of steel with corresponding change in the properties is known as%! |
| A. | Molecular change |
| B. | Physical change |
| C. | Allotropic change |
| D. | Solidus change |
| Answer» D. Solidus change | |
| 194. |
The charge is fed into the blast furnace through the%! |
| A. | Stack |
| B. | Throat |
| C. | Bosh |
| D. | Tyres |
| Answer» C. Bosh | |
| 195. |
The transistor is made of%! |
| A. | Silver |
| B. | Gold |
| C. | Copper |
| D. | Germanium |
| Answer» E. | |
| 196. |
Compressive strength of grey cast iron in tonnes/cm is of the order of%! |
| A. | 35 |
| B. | 57 |
| C. | 710 |
| D. | 1015 |
| Answer» C. 710 | |
| 197. |
Grey cast iron has%! |
| A. | Carbon in the form of free graphite |
| B. | High tensile strength |
| C. | Low compressive strength |
| D. | All of these |
| Answer» B. High tensile strength | |
| 198. |
Solder is an alloy consisting of%! |
| A. | Tin, antimony, copper |
| B. | Tin and copper |
| C. | Tin and lead |
| D. | Lead and zinc |
| Answer» C. Tin and lead | |
| 199. |
The alloying element which increases residual magnetism and coercive magnetic force in steel for magnets is%! |
| A. | Chromium |
| B. | Nickel |
| C. | Vanadium |
| D. | Cobalt |
| Answer» E. | |
| 200. |
The following element can't impart high strength at elevated temperature%! |
| A. | Manganese |
| B. | Magnesium |
| C. | Nickel |
| D. | Silicon |
| Answer» C. Nickel | |