MCQOPTIONS
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MCQOPTIONS
This section includes 493 Mcqs, each offering curated multiple-choice questions to sharpen your Mongodb knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
The soft grade grinding wheels are denoted by the letters |
| A. | A to H |
| B. | I to P |
| C. | Q to Z |
| D. | A to P |
| Answer» B. I to P | |
| 152. |
A dense structure of a grinding wheel is used for |
| A. | hard materials |
| B. | brittle materials |
| C. | fnishing cuts |
| D. | all of these |
| Answer» E. | |
| 153. |
The correct sequence of the following parameters in order of their maximum to minimum influence on tool life is |
| A. | feed rate, depth of cut, cutting speed |
| B. | depth of cut, cutting speed, feed rate |
| C. | cutting speed, feed rate, depth of cut |
| D. | feed rate, cutting speed, depth of cut |
| Answer» D. feed rate, cutting speed, depth of cut | |
| 154. |
The method of grinding used to produce internal cylindrical holes and tapers, is |
| A. | internal cylindrical grinding |
| B. | form grinding |
| C. | external cylindrical grinding |
| D. | surface grinding |
| Answer» B. form grinding | |
| 155. |
Down milling is also called |
| A. | conventional milling |
| B. | climb milling |
| C. | end milling |
| D. | face milling |
| Answer» C. end milling | |
| 156. |
High speed steel tools retain their hardness upto a temperature of |
| A. | 250°C |
| B. | 350°C |
| C. | 500°C |
| D. | 900°C |
| Answer» E. | |
| 157. |
In drilling operation, the metal is removed by |
| A. | shearing |
| B. | extrusion |
| C. | shearing and extrusion |
| D. | shearing and compression |
| Answer» D. shearing and compression | |
| 158. |
In twist fluted drills, chips do not move out automatically. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 159. |
With the same tool life, the maximum material per minute is removed by |
| A. | increasing the cutting speed |
| B. | decreasing the cutting speed |
| C. | increasing the depth of cut |
| D. | increasing the feed rate |
| Answer» D. increasing the feed rate | |
| 160. |
The type of tool used on milling machine and broaching machine is |
| A. | single point cutting tool |
| B. | two point cutting tool |
| C. | three point cutting tool |
| D. | multi-point cutting tool |
| Answer» E. | |
| 161. |
The structure of a grinding wheel depends upon |
| A. | hardness of the material being ground |
| B. | nature of the grinding operation |
| C. | finish required |
| D. | all of these |
| Answer» E. | |
| 162. |
If the shear angle is large and the chip-tool contact area is low, then the tool life will be more. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 163. |
In a shaper |
| A. | tool is stationary and work reciprocates |
| B. | work is stationary and tool reciprocates |
| C. | tool moves over stationary work |
| D. | tool moves over reciprocating work |
| Answer» C. tool moves over stationary work | |
| 164. |
Trepanning is an operation of |
| A. | making a cone-shaped enlargement of the end of a hole |
| B. | smoothing and squaring the surface around a hole |
| C. | sizing and finishing a small diameter hole |
| D. | producing a hole by removing metal along the circumference of a hollow cutting tool |
| Answer» E. | |
| 165. |
The infeed grinding is similar to plunge grinding. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» B. No | |
| 166. |
In electro-discharge machining, dielectric is used to |
| A. | help in the movement of the sparks |
| B. | control the spark discharges |
| C. | act as coolant |
| D. | all of these |
| Answer» E. | |
| 167. |
Tool life is generally better when |
| A. | grain size of the metal is large |
| B. | grain size of the metal is small |
| C. | hard constituents are present in the microstructure of the tool material |
| D. | none of the above |
| Answer» B. grain size of the metal is small | |
| 168. |
If the grain size is __________ the tool life is better. |
| A. | smaller |
| B. | larger |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 169. |
The grade of grinding wheel depends upon |
| A. | hardness of the material being ground |
| B. | speed of wheel and work |
| C. | condition of grinding machine |
| D. | all of these |
| Answer» E. | |
| 170. |
In hot machining, the work is heated by |
| A. | simple heating |
| B. | flame heating |
| C. | induction heating |
| D. | any one of these |
| Answer» E. | |
| 171. |
The type of tool used on lathe, shaper and planer is |
| A. | single point cutting tool |
| B. | two point cutting tool |
| C. | three point cutting tool |
| D. | multi-point cutting tool |
| Answer» B. two point cutting tool | |
| 172. |
The angle between the face and flank of the single point cutting tool is known as |
| A. | rake angle |
| B. | clearance angle |
| C. | lip angle |
| D. | point angle |
| Answer» D. point angle | |
| 173. |
Thread grinding requires work speed from |
| A. | 1 to 3 m/min |
| B. | 5 to 10 m/min |
| C. | 10 to 14 m/min |
| D. | 14 to 20 m/min |
| Answer» B. 5 to 10 m/min | |
| 174. |
Threading is an operation of |
| A. | smoothing and squaring the surface around a hole |
| B. | sizing and finishing a small diameter hole |
| C. | producing a hole by removing metal along the circumference of a hollow cutting tool |
| D. | cutting helical grooves on the external cylindrical surface |
| Answer» E. | |
| 175. |
An important geometrical quantity in the cutting of metals which can be used as a criterion for machinability of metals is |
| A. | cutting speed |
| B. | feed rate |
| C. | shear angle |
| D. | tool geometry |
| Answer» D. tool geometry | |
| 176. |
In metal cutting, use of low feeds and high cutting speeds is desired when the objective is |
| A. | high metal removal rate |
| B. | dry machining |
| C. | use of soft cutting tool |
| D. | surface finish |
| Answer» E. | |
| 177. |
In case of turning, as the machining proceeds, the spindle speed must __________ with the decrease in diameter of work. |
| A. | decrease |
| B. | increase |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 178. |
Which of the following statement is correct for orthogonal cutting system? |
| A. | The cutting edge of the tool is perpendicular to the direction of tool travel. |
| B. | The cutting edge clears the width of the workpiece on either ends. |
| C. | The chip flows over the tool face and the direction of the chip flow velocity is normal to the cutting edge. |
| D. | all of the above |
| Answer» E. | |
| 179. |
A drill bit of 20 mm diameter rotating at 500 r.p.m. with a feed rate of 0.2 mm/revolution is used to drill a through-hole in a mild steel plate 20 mm thickness. The depth of cut in this drilling operation is |
| A. | 0.2 mm |
| B. | 10 mm |
| C. | 20 mm |
| D. | 100 mm |
| Answer» D. 100 mm | |
| 180. |
In electro-chemical machining, the gap between the tool and work is kept as |
| A. | 0.1 mm |
| B. | 0.25 mm |
| C. | 0.4 mm |
| D. | 0.75 mm |
| Answer» E. | |
| 181. |
The angle between the shear plane and __________ is called shear angle. |
| A. | work surface |
| B. | tool face |
| C. | Can't say |
| D. | None of these |
| Answer» B. tool face | |
| 182. |
The ductile materials, during machining, produce |
| A. | continuous chips |
| B. | discontinuous chips |
| C. | continuous chips with built up edge |
| D. | either (a) or (c) |
| Answer» E. | |
| 183. |
When the shear angle is large |
| A. | path of shear is short and chip is thin |
| B. | path of shear is large and chip is thick |
| C. | path of shear is short and chip is thick |
| D. | path of shear is large and chip is thin |
| Answer» B. path of shear is large and chip is thick | |
| 184. |
In plunge grinding |
| A. | the work is reciprocated as the wheel feeds to produce cylinders longer than the width of wheel face |
| B. | the work rotates in a fixed position as the wheel feeds to produce cylinders equal to or shorter than the width of wheel face |
| C. | the work is reciprocated as the wheel feeds to produce cylinders shorter than the width of wheel face |
| D. | the work rotates in a fixed position as the wheel feeds to produce cylinders longer than the width of wheel face |
| Answer» C. the work is reciprocated as the wheel feeds to produce cylinders shorter than the width of wheel face | |
| 185. |
Cutting fluids are used to |
| A. | cool the tool |
| B. | improve surface finish |
| C. | cool the workpiece |
| D. | all of these |
| Answer» E. | |
| 186. |
Carbide tipped tools usually have |
| A. | negative rake angle |
| B. | positive rake angle |
| C. | any rake angle |
| D. | no rake angle |
| Answer» B. positive rake angle | |
| 187. |
The lathe centres are provided with standard taper known as |
| A. | Morse taper |
| B. | Seller's taper |
| C. | Chapman taper |
| D. | Brown and Sharpe taper |
| Answer» B. Seller's taper | |
| 188. |
Stellite preserve hardness upto a temperature of |
| A. | 350°C |
| B. | 500°C |
| C. | 900°C |
| D. | 1100°C |
| Answer» E. | |
| 189. |
In oblique cutting system, the maximum chip thickness |
| A. | occurs at the middle |
| B. | may not occur at the middle |
| C. | depends upon the material of the tool |
| D. | depends upon the geometry of the tool |
| Answer» C. depends upon the material of the tool | |
| 190. |
In drilling bakellite and fibrous plastics, the point angle of a drill is |
| A. | 90° |
| B. | 118° |
| C. | 135° |
| D. | 150° |
| Answer» B. 118° | |
| 191. |
The tool life is affected by |
| A. | depth of cut |
| B. | cutting speed |
| C. | feed |
| D. | all of these |
| Answer» E. | |
| 192. |
The tail stock and the carriage of a lathe may be guided on same or different guideway. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 193. |
In metal machining, the zone where the maximum heat is generated due to the plastic deformation of metal, is called |
| A. | friction zone |
| B. | work-tool contact zone |
| C. | shear zone |
| D. | none of these |
| Answer» D. none of these | |
| 194. |
The cutting speed for drilling aluminium, brass and bronze with carbon steel drills is __________ cutting speed for drilling mild steel with high speed steel drills. |
| A. | equal to |
| B. | less than |
| C. | more than |
| D. | None of these |
| Answer» B. less than | |
| 195. |
The operation of producing grooves around the periphery of a cylindrical or conical workpiece is called |
| A. | profile milling |
| B. | gang milling |
| C. | saw milling |
| D. | helical milling |
| Answer» E. | |
| 196. |
The abrasive recommended for grinding materials of high tensile strength is |
| A. | silicon carbide |
| B. | aluminium oxide |
| C. | sand stone |
| D. | diamond |
| Answer» C. sand stone | |
| 197. |
The hole to be drilled for tapping is __________ the outside diameter of the thread on the tap. |
| A. | equal to |
| B. | smaller than |
| C. | greater than |
| D. | None of these |
| Answer» C. greater than | |
| 198. |
The process of removing metal by a cutter which is rotated in the same direction of travel of workpiece, is called |
| A. | up milling |
| B. | down milling |
| C. | face milling |
| D. | end milling |
| Answer» C. face milling | |
| 199. |
A coarse grained grinding wheel is used to grind |
| A. | hard and brittle materials |
| B. | soft and ductile materials |
| C. | hard and ductile materials |
| D. | soft and brittle materials |
| Answer» C. hard and ductile materials | |
| 200. |
Flank wear depends upon the |
| A. | hardness of the work and tool material at the operating temperature |
| B. | amount and distribution of hard constituents in the work material |
| C. | degree of strain hardening in the chip |
| D. | all of these |
| Answer» C. degree of strain hardening in the chip | |