MCQOPTIONS
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MCQOPTIONS
This section includes 455 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. |
A three high rolling mill consists of three rolls placed one above the other. Which of the following statement is correct? |
| A. | he upper and middle rolls rotate in the same direction whereas the bottom roll rotates in opposite direction |
| B. | he upper and bottom rolls rotate in the same direction whereas the middle roll rotates in opposite direction |
| C. | he bottom and middle roll rotate in the same direction |
| D. | ny one of the above |
| Answer» C. he bottom and middle roll rotate in the same direction | |
| 152. |
The cold chisels are made from |
| A. | ast iron |
| B. | ild steel |
| C. | igh speed steel |
| D. | ast tool steel |
| Answer» E. | |
| 153. |
The metal patterns as compared to wooden patterns require less |
| A. | hrinkage allowance |
| B. | achining allowance |
| C. | raft allowance |
| D. | istortion allowance |
| Answer» D. istortion allowance | |
| 154. |
In backhand welding, the angle between the welding rod and the work is ________ as compared to forehand welding. |
| A. | ame |
| B. | ess |
| C. | ore |
| D. | one of these |
| Answer» B. ess | |
| 155. |
For arc welding |
| A. | lternating current with high frequency is used |
| B. | lternating current with low frequency is used |
| C. | irect current is used |
| D. | ny one of these |
| Answer» D. ny one of these | |
| 156. |
The process used to improve fatigue resistance of the metal by setting up compressive stresses in its surface, is known as |
| A. | ot piercing |
| B. | xtrusion |
| C. | old peening |
| D. | old heading |
| Answer» D. old heading | |
| 157. |
Cold working of metal increases |
| A. | ensile strength |
| B. | ield strength |
| C. | ardness |
| D. | ll of these |
| Answer» E. | |
| 158. |
The operation of producing cup shaped parts from flat sheet metal blanks by bending and plastic flow of metal, is known as |
| A. | rawing |
| B. | queezing |
| C. | oining |
| D. | lanishing |
| Answer» B. queezing | |
| 159. |
The operation of straightening a curved sheet metal, is known as |
| A. | rawing |
| B. | queezing |
| C. | oining |
| D. | lanishing |
| Answer» E. | |
| 160. |
In order to get uniform thickness of the plate by rolling process, one provides |
| A. | amber on the rolls |
| B. | ffset on the rolls |
| C. | ardening of the rolls |
| D. | ntifriction bearings |
| Answer» D. ntifriction bearings | |
| 161. |
A basic shaft is one whose |
| A. | ower deviation is zero |
| B. | pper deviation is zero |
| C. | ower and upper deviations are zero |
| D. | one of these |
| Answer» C. ower and upper deviations are zero | |
| 162. |
According to Indian standard specifications, 100 H6/g5 means that. |
| A. | asic size is 100 mm |
| B. | ctual size is 100 mm |
| C. | ifference between the actual size and basic size is 100 mm |
| D. | one of the above |
| Answer» B. ctual size is 100 mm | |
| 163. |
For welding plates of thickness less than 5 mm, its edges |
| A. | o not require bevelling |
| B. | hould be bevelled to a single-V or U-groove |
| C. | hould have a double-V or U-groove on one side |
| D. | hould have a double-V or U-groove on both sides |
| Answer» B. hould be bevelled to a single-V or U-groove | |
| 164. |
A file with 20 teeth in 25 mm is called |
| A. | ough file |
| B. | astard file |
| C. | econd cut file |
| D. | mooth file |
| Answer» B. astard file | |
| 165. |
When the dimension is expressed as 20 -0.025 ⁺⁰∙⁰³⁵, then the basic size is |
| A. | 0 mm |
| B. | 0.035 mm |
| C. | 0.025 mm |
| D. | 9.975 mm |
| Answer» B. 0.035 mm | |
| 166. |
The advantage of Thermit welding is that |
| A. | ll parts of the weld section are molten at the same time |
| B. | eld cools almost uniformly |
| C. | esults in a minimum problem with internal residual stresses |
| D. | ll of the above |
| Answer» E. | |
| 167. |
The shrinkage allowance for cast iron pattern is |
| A. | 0 mm/m |
| B. | 6 mm/m |
| C. | 0 mm/m |
| D. | 6 mm/m |
| Answer» B. 6 mm/m | |
| 168. |
When filing soft metals, the file teeth are clogged with minute particles of metal. The file should be cleaned by |
| A. | ashing it with water |
| B. | ubbing on wood |
| C. | ashing it with dilute acid |
| D. | sing file card |
| Answer» E. | |
| 169. |
the most preferred process for casting gas turbine blades is |
| A. | ie casting |
| B. | hell moulding |
| C. | nvestment moulding |
| D. | and casting |
| Answer» C. nvestment moulding | |
| 170. |
Projection welding is a |
| A. | ontinuous spot welding process |
| B. | ulti-spot welding process |
| C. | rc welding process |
| D. | rocess used for joining round bars |
| Answer» C. rc welding process | |
| 171. |
Shift is a casting defect which |
| A. | esults in a mismatching of the top and bottom parts of a casting |
| B. | esults in general enlargement of a casting |
| C. | ccurs near the ingates as rough lumps on the surface of a casting |
| D. | ccurs as sand patches on the upper surface of a casting |
| Answer» B. esults in general enlargement of a casting | |
| 172. |
During hot working of metals |
| A. | orosity of the metal is largely eliminated |
| B. | rain structure of the metal is refined |
| C. | echanical properties are improved due to refinement of grains |
| D. | ll of the above |
| Answer» E. | |
| 173. |
The material which can be best cut with oxygen cutting process is |
| A. | ild steel |
| B. | rass |
| C. | opper |
| D. | luminium |
| Answer» B. rass | |
| 174. |
The mode of deformation of the metal during spinning is |
| A. | ending |
| B. | tretching |
| C. | olling and stretching |
| D. | ending and stretching |
| Answer» E. | |
| 175. |
The temperature of oxy-hydrogen flame is ________ oxyacetylene flame. |
| A. | ame as |
| B. | ess than |
| C. | ore than |
| D. | one of these |
| Answer» C. ore than | |
| 176. |
Tandem drawing of wires and tubes is necessary because |
| A. | t is not possible to reduce at one stage |
| B. | nnealing is needed between stages |
| C. | ccuracy in dimensions is not possible otherwise |
| D. | urface finish improves after every drawing stage |
| Answer» C. ccuracy in dimensions is not possible otherwise | |
| 177. |
In a unilateral system of tolerance, the tolerance is allowed on |
| A. | ne side of the actual size |
| B. | ne side of the nominal size |
| C. | oth sides of the actual size |
| D. | oth sides of the nominal size |
| Answer» C. oth sides of the actual size | |
| 178. |
The property of sand due to which the sand grains stick together is called |
| A. | ollapsibility |
| B. | ermeability |
| C. | ohesiveness |
| D. | dhesiveness |
| Answer» D. dhesiveness | |
| 179. |
In a four high rolling mill, the diameter of backing up rolls is ________ the diameter of working rolls. |
| A. | qual to |
| B. | maller than |
| C. | arger than |
| D. | one of these |
| Answer» D. one of these | |
| 180. |
In die casting, machining allowance is |
| A. | mall |
| B. | arge |
| C. | ery large |
| D. | ot provided |
| Answer» E. | |
| 181. |
The surface to be machined is marked on the pattern by |
| A. | ed colour |
| B. | ellow colour |
| C. | lack colour |
| D. | lue colour |
| Answer» B. ellow colour | |
| 182. |
The surface to be left unmachined is marked on the pattern by |
| A. | ed colour |
| B. | ellow colour |
| C. | lack colour |
| D. | lue colour |
| Answer» D. lue colour | |
| 183. |
In ________ welding, the weld may be made either from left to right or from right to left. |
| A. | orehand |
| B. | ackhand |
| C. | ertical |
| D. | one of these |
| Answer» D. one of these | |
| 184. |
In electric resistance welding, pressure applied varies from |
| A. | to 5 MPa |
| B. | to 10 MPa |
| C. | 0 to 25 MPa |
| D. | 5 to 55 MPa |
| Answer» E. | |
| 185. |
If an aluminium pattern made from a wooden master pattern is to be used for grey iron castings, then the shrinkage allowance allowed on the wooden pattern should be |
| A. | 0 mm/m |
| B. | 6 mm/m |
| C. | 0 mm/m |
| D. | 6 mm/m |
| Answer» E. | |
| 186. |
A mortise gauge is a |
| A. | triking tool |
| B. | laning tool |
| C. | oring tool |
| D. | arking tool |
| Answer» E. | |
| 187. |
For gas welding, the pressure desired at the welding torch for oxygen is |
| A. | to 103 kN/m² |
| B. | 0 to 280 kN/m² |
| C. | 80 to 560 kN/m² |
| D. | 60 to 840 kN/m² |
| Answer» C. 80 to 560 kN/m² | |
| 188. |
Piercing is an operation of cutting |
| A. | cylindrical hole in a sheet of metal by the punch and the die |
| B. | hole (other than cylindrical) in a sheet of metal by the punch and the die |
| C. | flat sheet to the desired shape |
| D. | number of holes evenly spaced in a regular pattern on a sheet of metal |
| Answer» C. flat sheet to the desired shape | |
| 189. |
The sand used for making cores is |
| A. | reen sand |
| B. | ry sand |
| C. | oam sand |
| D. | il sand |
| Answer» E. | |
| 190. |
An oxidising process used for aluminium and magnesium articles is called |
| A. | alvanizing |
| B. | nodizing |
| C. | arkerising |
| D. | herardizing |
| Answer» C. arkerising | |
| 191. |
When a pattern is made in three parts, the top part, is known as a |
| A. | rag |
| B. | heek |
| C. | ope |
| D. | one of these |
| Answer» D. one of these | |
| 192. |
Rotary swaging |
| A. | s extensively used for making bolts and rivets |
| B. | s used for reducing the diameters of round bars and a tube by rotating dies which open and close rapidly on the work |
| C. | s used to improve fatigue resistance of the metal by setting up compressive stresses in its surface |
| D. | onsists of pressing the metal inside a chamber to force it out by high pressure through an orifice which is shaped to provide the desired form of the finished part |
| Answer» C. s used to improve fatigue resistance of the metal by setting up compressive stresses in its surface | |
| 193. |
Seam welding is a |
| A. | ontinuous spot welding process |
| B. | ulti-spot welding process |
| C. | rc welding process |
| D. | rocess used for joining round bars |
| Answer» B. ulti-spot welding process | |
| 194. |
The adhesiveness is the property of sand due to which |
| A. | t evolves a great amount of steam and other gases |
| B. | he sand grains stick together |
| C. | t clings to the sides of a moulding box |
| D. | one of these |
| Answer» D. one of these | |
| 195. |
In arc welding, the temperature of heat produced by the electric arc is of the order of |
| A. | 000°C to 4000°C |
| B. | 000°C to 5000°C |
| C. | 000°C to 6000°C |
| D. | 000°C to 7000°C |
| Answer» E. | |
| 196. |
A casting defect which occurs near the ingates as rough lumps on the surface of a casting is known as |
| A. | hift |
| B. | and wash |
| C. | well |
| D. | cab |
| Answer» C. well | |
| 197. |
A casting defect which results in general enlargement of a casting is known as |
| A. | hift |
| B. | and wash |
| C. | well |
| D. | cab |
| Answer» D. cab | |
| 198. |
The temperature of oxy-hydrogen flame is ________ oxyacetylene flame.~! |
| A. | Same as |
| B. | Less than |
| C. | More than |
| D. | None of these |
| Answer» C. More than | |
| 199. |
V-block is used to%! |
| A. | Check the trueness of flat surfaces |
| B. | Locate centres of round rods |
| C. | Check the surface roughness |
| D. | None of these |
| Answer» E. | |
| 200. |
During drawing operation, the states of stress in cup would include%! |
| A. | Compressive stress in the flange |
| B. | Tensile stress in the wall |
| C. | Both (A) and (B) |
| D. | None of these |
| Answer» D. None of these | |