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.
| 201. |
Flank wear is due to the abrasive action of hard mis-constituents including debris from built up edge as the work material rubs the work surface. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 202. |
The high cutting speed and large rake angle of the tool will result in the formation of |
| A. | continuous chips |
| B. | discontinuous chip |
| C. | continuous chips with built up edge |
| D. | none of these |
| Answer» B. discontinuous chip | |
| 203. |
Ceramic cutting tools are |
| A. | made by cold pressing of aluminium oxide powder |
| B. | available in the form of tips |
| C. | brittle and have low bending strength |
| D. | all of these |
| Answer» E. | |
| 204. |
In centreless grinders, the maximum angular adjustment of the regulating wheel is |
| A. | 5° |
| B. | 10° |
| C. | 15° |
| D. | 20° |
| Answer» C. 15° | |
| 205. |
In a shaper, the length of stroke is increased by |
| A. | increasing the centre distance of bull gear and crank pin |
| B. | decreasing the centre distance of bull gear and crank pin |
| C. | increasing the length of the arm |
| D. | decreasing the length of the slot in the slotted lever |
| Answer» B. decreasing the centre distance of bull gear and crank pin | |
| 206. |
The time (in minutes) for a drilling a hole is given by where h is the |
| A. | length of the drill |
| B. | drill diameter |
| C. | flute length of the drill |
| D. | cone height of the drill |
| Answer» E. | |
| 207. |
Discontinuous chips are formed during machining of |
| A. | brittle metals |
| B. | ductile metals |
| C. | hard metals |
| D. | soft metals |
| Answer» B. ductile metals | |
| 208. |
In centreless grinders, the regulating wheel is inclined at |
| A. | 0° to 8° |
| B. | 9° to 15° |
| C. | 16° to 20° |
| D. | 21° to 25° |
| Answer» B. 9° to 15° | |
| 209. |
In which of the following machine, the work remains stationary and the tool is rotated? |
| A. | Vertical boring machine |
| B. | Horizontal boring machine |
| C. | Precision boring machine |
| D. | Jig boring machine |
| Answer» C. Precision boring machine | |
| 210. |
In order to obtain a surface finish in the range of 0.75 μm to 1.25 μm , the operation used is called. |
| A. | grinding |
| B. | lapping |
| C. | honing |
| D. | buffing |
| Answer» B. lapping | |
| 211. |
In an orthogonal cutting, the depth of cut is halved and the feed rate is double. If the chip thickness ratio is unaffected with the changed cutting conditions, the actual chip thickness will be |
| A. | doubled |
| B. | halved |
| C. | quadrupled |
| D. | unchanged |
| Answer» B. halved | |
| 212. |
Crater wear leads to |
| A. | increase in cutting temperature |
| B. | weakening of tool |
| C. | friction and cutting forces |
| D. | all of these |
| Answer» E. | |
| 213. |
In machining metals, chips break due to __________ of work material. |
| A. | toughness |
| B. | ductility |
| C. | elasticity |
| D. | work hardening |
| Answer» E. | |
| 214. |
Glazing in grinding wheels __________ cutting capacity. |
| A. | has no effect on |
| B. | increase |
| C. | decrease |
| D. | None of these |
| Answer» D. None of these | |
| 215. |
The cutting force in up milling __________ per tooth movement of the cutter. |
| A. | is zero |
| B. | is maximum |
| C. | decreases from maximum to zero |
| D. | increases from zero to maximum |
| Answer» E. | |
| 216. |
In oblique cutting system, the tool may or may not generate a surface parallel to the workface. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» B. No | |
| 217. |
The thrust force will increase with the increase in |
| A. | side cutting edge angle |
| B. | tool nose radius |
| C. | rake angle |
| D. | end cutting edge angle |
| Answer» B. tool nose radius | |
| 218. |
A diamond locating pin is used in jigs and fixtures because |
| A. | diamond is very hard and wear resistant |
| B. | it occupies very little space |
| C. | it helps in assembly with tolerance on centre distance |
| D. | it has a long life |
| Answer» D. it has a long life | |
| 219. |
The lip clearance angle is the angle formed by the |
| A. | leading edge of the land with a plane having the axis of the drill |
| B. | flank and a plane at right angles to the drill axis |
| C. | chisel edge and the lip as viewed from the end of a drill |
| D. | none of the above |
| Answer» C. chisel edge and the lip as viewed from the end of a drill | |
| 220. |
The chamfering is an essential operation after |
| A. | knurling |
| B. | rough turning |
| C. | boring |
| D. | thread cutting |
| Answer» E. | |
| 221. |
The operation of making a cone-shaped enlargement of the end of a hole is known as |
| A. | counter-sinking |
| B. | counter-boring |
| C. | trepanning |
| D. | spot facing |
| Answer» B. counter-boring | |
| 222. |
In determining the various forces on the chip, Merchant assumed that the |
| A. | cutting edge of the tool is sharp and it does not make any flank contact with the workpiece |
| B. | only continuous chip without built-up-edge is produced |
| C. | cutting velocity remains constant |
| D. | all of the above |
| Answer» E. | |
| 223. |
The drill spindles 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 | |
| 224. |
When the backgear is engaged in a backgeared headstock, the spindle speed reduces considerably. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 225. |
Broaching is applied for machining |
| A. | internal and external surfaces |
| B. | round or irregular shaped holes |
| C. | external flat and contoured surfaces |
| D. | all of these |
| Answer» E. | |
| 226. |
In which of the following machine, the work rotates and the tool is stationary? |
| A. | Vertical boring machine |
| B. | Horizontal boring machine |
| C. | Precision boring machine |
| D. | Jig boring machine |
| Answer» B. Horizontal boring machine | |
| 227. |
A jig is defined as a device which |
| A. | holds and locates a workpiece and guides and controls one or more cutting tools |
| B. | holds and locates a workpiece during an inspection or for a manufacturing operation |
| C. | is used to check the accuracy of workpiece |
| D. | all of the above |
| Answer» B. holds and locates a workpiece during an inspection or for a manufacturing operation | |
| 228. |
The example of snag grinding is |
| A. | trimming the surface left by sprues and risers on castings |
| B. | grinding the parting line left on castings |
| C. | removing flash on forgings |
| D. | all of these |
| Answer» E. | |
| 229. |
Carbon tool steels have low-heat and wear-resistance. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 230. |
Cemented carbide tools are generally poor in shear. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» B. No | |
| 231. |
The rake angle of a single point cutting tool corresponds to __________ of a twist drill. |
| A. | lip clearance angle |
| B. | helix angle |
| C. | point angle |
| D. | chisel edge angle |
| Answer» C. point angle | |
| 232. |
In a single point turning operation with a cemented carbide and steel combination having a Taylor exponent of 0.25, if the cutting speed is halved, then tool life will become |
| A. | half |
| B. | two times |
| C. | eight times |
| D. | sixteen times |
| Answer» E. | |
| 233. |
As the cutting speed increases, the tool cutting forces |
| A. | remain constant |
| B. | increases |
| C. | decreases |
| D. | first increases and then decreases |
| Answer» D. first increases and then decreases | |
| 234. |
In machining metal, cutting force at the cutting edge is measured by a |
| A. | wattmeter |
| B. | dynamometer |
| C. | hydrometer |
| D. | pyrometer |
| Answer» C. hydrometer | |
| 235. |
When the grinding wheel is marked by the letters from I to P, it indicates that the grinding wheel is of hard grade. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 236. |
The size of a shaper is given by |
| A. | stroke length |
| B. | motor power |
| C. | mass of machine |
| D. | rate size |
| Answer» B. motor power | |
| 237. |
For machining a cast iron workpiece by a high speed steel tool, the average cutting speed is |
| A. | 10 m/min |
| B. | 15 m/min |
| C. | 22 m/min |
| D. | 30 m/min |
| Answer» D. 30 m/min | |
| 238. |
When the shear angle is small |
| 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» C. path of shear is short and chip is thick | |
| 239. |
In a single point tool, the angle between the surface of the flank immediately below the point and a line drawn from the point perpendicular to the base, is known as |
| A. | side relief angle |
| B. | end relief angle |
| C. | back rake angle |
| D. | side rake angle |
| Answer» C. back rake angle | |
| 240. |
The effect of setting a boring tool above centre height leads to |
| A. | increase in the effective rake angle and a decrease in the effective clearance angle |
| B. | increase in both effective rake angle and effective clearance angle |
| C. | decrease in the effective rake angle and an increase in the effective clearance angle |
| D. | decrease in both effective rake angle and effective clearance angle |
| Answer» B. increase in both effective rake angle and effective clearance angle | |
| 241. |
Larger than 15° side cutting edge angle |
| A. | increases tool life |
| B. | decreases tool life |
| C. | produces chipping and decreases tool life |
| D. | results in excessive stress concentration and greater heat generation |
| Answer» D. results in excessive stress concentration and greater heat generation | |
| 242. |
In metal machining, the work-tool contact zone is a zone where heat is generated due to |
| A. | plastic deformation of metal |
| B. | burnishing friction |
| C. | friction between the moving chip and the tool face |
| D. | none of the above |
| Answer» C. friction between the moving chip and the tool face | |
| 243. |
In machining soft materials, a tool with negative relief angle is used. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 244. |
Tool signature consists of __________ elements. |
| A. | two |
| B. | four |
| C. | five |
| D. | seven |
| Answer» E. | |
| 245. |
In the relation VTn = C, the value of n for ceramic tools is |
| A. | 0.1 to 0.2 |
| B. | 0.20 to 0.25 |
| C. | 0.25 to 0.40 |
| D. | 0.40 to 0.55 |
| Answer» E. | |
| 246. |
Which of the following parameters govern the value of shear angle in continuous chip formation? |
| A. | True feed |
| B. | Chip thickness |
| C. | Rake angle of the cutting tool |
| D. | all of these |
| Answer» E. | |
| 247. |
In machining cast iron, no cutting fluid is required. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 248. |
The snag grinding is done |
| A. | to produce good surface finish and high degree of accuracy |
| B. | to remove considerable amount of metal without regard to accuracy of the finished surface |
| C. | to grind exterior cylindrical surfaces |
| D. | any one of the above |
| Answer» C. to grind exterior cylindrical surfaces | |
| 249. |
A taper tap has |
| A. | its end tapered for about three or four threads |
| B. | its end tapered for about eight or ten threads |
| C. | full threads for the whole of its length |
| D. | none of the above |
| Answer» C. full threads for the whole of its length | |
| 250. |
The purpose of jigs and fixtures is to |
| A. | increase machining accuracy |
| B. | facilitate interchangeability |
| C. | decrease expenditure on quality control |
| D. | all of these |
| Answer» E. | |