MCQOPTIONS
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MCQOPTIONS
This section includes 800 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 251. |
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. | |
| 252. |
As tool and work are not in contact in EDM process |
| A. | No relative motion occurs between them |
| B. | No wear of tool occurs |
| C. | No power is consumed during metal cutting |
| D. | No force between tool and work occurs |
| Answer» E. | |
| 253. |
In up milling, the thickness of chip is |
| A. | Minimum at the beginning of the cut and maximum at the end of the cut |
| B. | Maximum at the beginning of the cut and minimum at the end of the cut |
| C. | Uniform throughout the cut |
| D. | None of these |
| Answer» B. Maximum at the beginning of the cut and minimum at the end of the cut | |
| 254. |
In down milling, the thickness of chip is |
| A. | Minimum at the beginning of the cut and maximum at the end of the cut |
| B. | Maximum at the beginning of the cut and minimum at the end of the cut |
| C. | Uniform throughout the cut |
| D. | None of these |
| Answer» C. Uniform throughout the cut | |
| 255. |
High speed steel drills can be operated at about _________ the speed of high carbon steel drills. |
| A. | One-half |
| B. | One-fourth |
| C. | Double |
| D. | Four times |
| Answer» D. Four times | |
| 256. |
The swing diameter over the bed is ________ the height of the centre measured from the bed of the lathe. |
| A. | Equal to |
| B. | Twice |
| C. | Thrice |
| D. | One-half |
| Answer» C. Thrice | |
| 257. |
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 | |
| 258. |
An expendable pattern is used in |
| A. | Slush casting |
| B. | Squeeze casting |
| C. | Centrifugal casting |
| D. | Investment casting |
| Answer» E. | |
| 259. |
Friction at the tool-chip interface can be reduced by |
| A. | Decreasing the rake angle |
| B. | Increasing the depth of cut |
| C. | Decreasing the cutting speed |
| D. | Increasing the cutting speed |
| Answer» E. | |
| 260. |
Which of the following statement is correct about nose radius? |
| A. | It improves tool life |
| B. | It improves the surface finish |
| C. | Both (A) and (B) |
| D. | None of these |
| Answer» D. None of these | |
| 261. |
A bottoming 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» D. None of the above | |
| 262. |
In drilling brass, a drill with |
| A. | Zero helix angle is used |
| B. | Low helix angle is used |
| C. | High helix angle is used |
| D. | Any helix angle can be used |
| Answer» C. High helix angle is used | |
| 263. |
Gears can be best produced on mass production by |
| A. | Shaping |
| B. | Casting |
| C. | Forming |
| D. | Hobbing |
| Answer» E. | |
| 264. |
Which of the following statement is wrong about ultrasonic machining? |
| A. | It is best suited for machining hard and brittle materials. |
| B. | It cuts materials at very slow speeds |
| C. | It removes large amount of material |
| D. | It produces good surface finish |
| Answer» D. It produces good surface finish | |
| 265. |
A fixture 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» C. Is used to check the accuracy of workpiece | |
| 266. |
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 | |
| 267. |
In metal cutting operations, the shear angle is the angle made by the shear plane with the |
| A. | Direction of the tool axis |
| B. | Direction of tool travel |
| C. | Perpendicular to the direction of the tool axis |
| D. | Central plane of the workpiece |
| Answer» C. Perpendicular to the direction of the tool axis | |
| 268. |
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 | |
| 269. |
In transverse 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» 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 | |
| 270. |
A shaft has a dimension, φ9 +0.025⁺⁰∙⁰⁰⁹, the respective values of fundamental deviation and tolerance are |
| A. | −0.025, ±0.008 |
| B. | −0.025, 0.016 |
| C. | −0.009, ± 0.008 |
| D. | −0.009, 0.016 |
| Answer» E. | |
| 271. |
The lathe spindles are usually made hollow and provided with |
| A. | Internal taper |
| B. | External taper |
| C. | Internal and external taper |
| D. | No taper |
| Answer» B. External taper | |
| 272. |
The factor responsible for the formation of continuous chips with built up edge is |
| A. | Low cutting speed and large rake angle |
| B. | Low cutting speed and small rake angle |
| C. | High cutting speed and large rake angle |
| D. | High cutting speed and small rake angle |
| Answer» C. High cutting speed and large rake angle | |
| 273. |
In order to achieve a specific surface finish in single point turning, the most important factor to be controlled is |
| A. | Depth of cut |
| B. | Cutting speed |
| C. | Feed |
| D. | Tool rake angle |
| Answer» C. Feed | |
| 274. |
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. | |
| 275. |
In an interchangeable assembly, shafts of size 25.000 -0.0100⁺⁰∙⁰⁴⁰ mm mate with holes of size 25.000 -0.010⁺⁰∙⁰²⁰ mm. The maximum possible clearance in the assembly will be |
| A. | 10 microns |
| B. | 20 microns |
| C. | 30 microns |
| D. | 60 microns |
| Answer» D. 60 microns | |
| 276. |
Negative rakes are used for |
| A. | Carbide tools |
| B. | Heavy loads |
| C. | Harder materials |
| D. | All of these |
| Answer» E. | |
| 277. |
Chip breakers are used to |
| A. | Increase tool life |
| B. | Remove chips from bed |
| C. | Break the chips into short segments |
| D. | To minimize heat generation |
| Answer» D. To minimize heat generation | |
| 278. |
The tool life is said to be over if |
| A. | Poor surface finish is obtained |
| B. | There is sudden increase in cutting forces and power consumption |
| C. | Overheating and fuming due to heat of friction starts |
| D. | All of the above |
| Answer» E. | |
| 279. |
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. | |
| 280. |
The cutting fluid mostly used for machining steel is |
| A. | Water |
| B. | Soluble oil |
| C. | Dry |
| D. | Heavy oils |
| Answer» C. Dry | |
| 281. |
Cast iron during machining produces |
| A. | Continuous chips |
| B. | Discontinuous chips |
| C. | Continuous chips with built-up edge |
| D. | None of these |
| Answer» C. Continuous chips with built-up edge | |
| 282. |
In a plain milling machine, the table can be moved |
| A. | Longitudinally |
| B. | Crosswise |
| C. | Vertically |
| D. | All of these |
| Answer» E. | |
| 283. |
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 | |
| 284. |
A broach has |
| A. | Roughing teeth |
| B. | Semi-finishing teeth |
| C. | Finishing teeth |
| D. | All of these |
| Answer» E. | |
| 285. |
The lead screw of a lathe has _________ threads. |
| A. | Single start |
| B. | Double start |
| C. | Multi-start |
| D. | Any one of these |
| Answer» B. Double start | |
| 286. |
Larger end cutting edge angle _________ tool life. |
| A. | Increases |
| B. | Decreases |
| C. | Does not effect |
| D. | None of these |
| Answer» B. Decreases | |
| 287. |
The increase in depth of cut and feed rate _________ surface finish. |
| A. | Improves |
| B. | Deteriorates |
| C. | Does not effect |
| D. | None of these |
| Answer» C. Does not effect | |
| 288. |
The vector sum of cutting velocity and chip velocity is __________ shear velocity. |
| A. | Equal to |
| B. | Less than |
| C. | More than |
| D. | None of these |
| Answer» B. Less than | |
| 289. |
In a gating system, the ratio 1: 2: 4 represents |
| A. | Sprue base area: runner area: ingate area |
| B. | Pouring basin area: ingate area: runner area |
| C. | Sprue base area: ingate area: casting area |
| D. | Runner area: ingate area: casting area |
| Answer» B. Pouring basin area: ingate area: runner area | |
| 290. |
In hot machining, tool is made of |
| A. | Tungsten carbide |
| B. | Brass or copper |
| C. | Diamond |
| D. | Stainless steel |
| Answer» B. Brass or copper | |
| 291. |
In ultrasonic machining, tool is made of |
| A. | Tungsten carbide |
| B. | Brass or copper |
| C. | Diamond |
| D. | Stainless steel |
| Answer» C. Diamond | |
| 292. |
While current is shut down in the welding circuit, what kind of voltage exists between the output terminals of the welding machine? |
| A. | GTAW |
| B. | Open air cut voltage |
| C. | Kerf |
| D. | Gouging |
| Answer» C. Kerf | |
| 293. |
A twist drill is a |
| A. | Side cutting tool |
| B. | Front cutting tool |
| C. | End cutting tool |
| D. | None of these |
| Answer» D. None of these | |
| 294. |
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 | |
| 295. |
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 | |
| 296. |
Which of the following statement is wrong as regard to down milling? |
| A. | It can not be used on old machines due to backlash between the feed screw of the table and the nut. |
| B. | The chips are disposed off easily and do not interfere with the cutting. |
| C. | The surface milled appears to be slightly wavy. |
| D. | The coolant can be poured directly at the cutting zone where the cutting force is maximum. |
| Answer» D. The coolant can be poured directly at the cutting zone where the cutting force is maximum. | |
| 297. |
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 | |
| 298. |
What is the type of welding defect caused due to shrinkage during solidification and by weld stresses called? |
| A. | Incomplete fusion |
| B. | Lamellar tearing |
| C. | Mismatch |
| D. | Shrinkage void |
| Answer» C. Mismatch | |
| 299. |
The size of a lathe is specified by the |
| A. | Length between centers |
| B. | Swing diameter over the bed |
| C. | Swing diameter over the carriage |
| D. | All of these |
| Answer» E. | |
| 300. |
A tool used to withdraw a drill from the sleeve is called |
| A. | Drill remover |
| B. | Drill puller |
| C. | Drift |
| D. | Drill drawer |
| Answer» D. Drill drawer | |