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.
| 451. |
*/*_Continuous chips with built up edge are formed during machining of? |
| A. | Brittle metals |
| B. | Ductile metals |
| C. | Hard metals |
| D. | Soft metals |
| Answer» C. Hard metals | |
| 452. |
*/*_The chamfering is an operation of? |
| A. | Beveling the extreme end of a workpiece |
| B. | Embossing a diamond shaped pattern on the surface of a workpiece |
| C. | Reducing the diameter of a workpiece over a very narrow surface |
| D. | Enlarging the end of a hole cylindrically |
| Answer» B. Embossing a diamond shaped pattern on the surface of a workpiece | |
| 453. |
*/*_The broaching operation in which the work moves past the stationary tool is called? |
| A. | Pull broaching |
| B. | Push broaching |
| C. | Surface broaching |
| D. | Continuous broaching |
| Answer» E. | |
| 454. |
*/*_The different spindle speeds on a lathe form? |
| A. | Arithmetical progression |
| B. | Geometrical progression |
| C. | Harmonical progression |
| D. | Any one of these |
| Answer» C. Harmonical progression | |
| 455. |
*/*_Ultrasonic machining is best suited for? |
| A. | Tool steels |
| B. | Sintered carbides |
| C. | Glass |
| D. | All of these |
| Answer» E. | |
| 456. |
%_In abrasive jet machining, as the distance between the nozzle tip and the work surface increases, the material removal rate_% |
| A. | Increases continuously |
| B. | Decreases continuously |
| C. | Decreases becomes stable and then increases |
| D. | Increases, becomes stable and then decreases |
| Answer» E. | |
| 457. |
%_High speed steel cutting tools operate at cutting speeds _________ than carbon steel tools._% |
| A. | 2 to 3 times lower |
| B. | 2 to 3 times higher |
| C. | 5 to 8 times higher |
| D. | 8 to 20 times higher |
| Answer» C. 5 to 8 times higher | |
| 458. |
%_Calculate the weld per minute, work speed of circular electrode of 220 mm diameter for carrying out seam welding at 4 welds per cm on 1.6 mm thick mild steel tube. Welding cycle consists of 3 cycles ‘on’ and 2 cycles ‘off’ Power supply is at 50 Hz._% |
| A. | 3000 welds/min, 75 mm/min |
| B. | 600 welds/min, 1500 mm/min |
| C. | 500 welds/min, 1250 mm/min |
| D. | 22 welds/min, 55 mm/min |
| Answer» C. 500 welds/min, 1250 mm/min | |
| 459. |
%_Shrinkage allowance on pattern is provided to compensate for shrinkage when_% |
| A. | The temperature of liquid metal drops from pouring to freezing temperature |
| B. | The metal changes from liquid to solid state at freezing temperature |
| C. | The temperature of solid phase drops from freezing to room temperature |
| D. | The temperature of metal drops from pouring to room temperature |
| Answer» D. The temperature of metal drops from pouring to room temperature | |
| 460. |
%_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 | |
| 461. |
%_The strength of a brazed joint_% |
| A. | Decreases with increase in gap between the two joining surfaces |
| B. | Increases with increase in gap between the two joining surfaces |
| C. | Decreases up to certain gap between the two joining surfaces beyond which it increases |
| D. | Increases up to certain gap between the two joining surfaces beyond which it decreases |
| Answer» E. | |
| 462. |
%_The factor responsible for the formation of discontinuous chips 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 | |
| 463. |
%_The tool material, for faster machining, should have_% |
| A. | Wear resistance |
| B. | Red hardness |
| C. | Toughness |
| D. | All of these |
| Answer» E. | |
| 464. |
%_The different spindle speeds on a lathe form_% |
| A. | Arithmetical progression |
| B. | Geometrical progression |
| C. | Harmonical progression |
| D. | Any one of these |
| Answer» C. Harmonical progression | |
| 465. |
%_Ultrasonic machining is best suited for_% |
| A. | Tool steels |
| B. | Sintered carbides |
| C. | Glass |
| D. | All of these |
| Answer» E. | |
| 466. |
%_Continuous chips with built up edge are formed during machining of_% |
| A. | Brittle metals |
| B. | Ductile metals |
| C. | Hard metals |
| D. | Soft metals |
| Answer» C. Hard metals | |
| 467. |
%_The chamfering is an operation of_% |
| A. | Beveling the extreme end of a workpiece |
| B. | Embossing a diamond shaped pattern on the surface of a workpiece |
| C. | Reducing the diameter of a workpiece over a very narrow surface |
| D. | Enlarging the end of a hole cylindrically |
| Answer» B. Embossing a diamond shaped pattern on the surface of a workpiece | |
| 468. |
%_The broaching operation in which the work moves past the stationary tool is called_% |
| A. | Pull broaching |
| B. | Push broaching |
| C. | Surface broaching |
| D. | Continuous broaching |
| Answer» E. | |
| 469. |
%_Crater wear leads to_% |
| A. | Increase in cutting temperature |
| B. | Weakening of tool |
| C. | Friction and cutting forces |
| D. | All of these |
| Answer» E. | |
| 470. |
%_Two plates of the same metal having equal thickness are to be butt welded with electric arc. When the plate thickness changes, welding is achieved by_% |
| A. | Adjusting the current |
| B. | Adjusting the duration of current |
| C. | Changing the electrode size |
| D. | Changing the electrode coating |
| Answer» D. Changing the electrode coating | |
| 471. |
%_Glazing in grinding wheels can be decreased by_% |
| A. | Using a harder wheel or by increasing the wheel speed |
| B. | Using a softer wheel or by decreasing the wheel speed |
| C. | Using a harder wheel or by decreasing the wheel speed |
| D. | Using a softer wheel or by increasing the wheel speed |
| Answer» C. Using a harder wheel or by decreasing the wheel speed | |
| 472. |
%_When the tool moves parallel to the lathe axis, the movement is termed as_% |
| A. | Cross feed |
| B. | Angular feed |
| C. | Longitudinal feed |
| D. | Any one of these |
| Answer» D. Any one of these | |
| 473. |
%_Allowance in limits and fits refers to_% |
| A. | Maximum clearance between shaft and hole |
| B. | Minimum clearance between shaft and hole |
| C. | Difference between maximum and minimum sizes of hole |
| D. | Difference between maximum and minimum sizes of shaft |
| Answer» B. Minimum clearance between shaft and hole | |
| 474. |
%_In an interchangeable assembly, shafts of size 25.000 -0.010‚Å∫‚Å∞‚à ô‚Å∞‚Å¥‚Å∞ mm mate with holes of size 25.000 -0.020‚Å∫‚Å∞‚à ô‚Å∞¬≥‚Å∞, the maximum interference (in microns) in the assembly is_% |
| A. | 40 |
| B. | 30 |
| C. | 20 |
| D. | 10 |
| Answer» D. 10 | |
| 475. |
%_What is the name of the device used in arc welding circuits for the purpose of modifying the rate of current change when the weld road is varied rapidly?_% |
| A. | Reactor |
| B. | Kerf |
| C. | Inductor |
| D. | Cone |
| Answer» D. Cone | |
| 476. |
%_The angle made by the face of the tool and the plane parallel to the base of cutting tool is called_% |
| A. | Rake angle |
| B. | Cutting angle |
| C. | Clearance angle |
| D. | Lip angle |
| Answer» B. Cutting angle | |
| 477. |
%_In ultrasonic machining, tool is made of_% |
| A. | Tungsten carbide |
| B. | Brass or copper |
| C. | Diamond |
| D. | Stainless steel |
| Answer» C. Diamond | |
| 478. |
%_Which of the following statement is correct regarding grinding of high carbon steel?_% |
| A. | Grinding at high speed results in the reduction of chip thickness and cutting forces per grit. |
| B. | Aluminium oxide wheels are employed. |
| C. | The grinding wheel has to be of open structure. |
| D. | All of the above |
| Answer» E. | |
| 479. |
%_In Oxyacetylene gas welding, temperature at the inner cone of the flame is around_% |
| A. | 3500°C |
| B. | 3200°C |
| C. | 2900°C |
| D. | 2550°C |
| Answer» C. 2900¬¨‚àûC | |
| 480. |
_ The in-feed grinding is used to$? |
| A. | Produce tapers |
| B. | Grind shoulders and formed surfaces |
| C. | Grind long, slender shafts or bars |
| D. | All of these |
| Answer» C. Grind long, slender shafts or bars | |
| 481. |
_ In a shaper, the metal is removed during$? |
| A. | Forward stroke |
| B. | Return stroke |
| C. | Both the forward and return strokes |
| D. | Neither the forward nor the return stroke |
| Answer» B. Return stroke | |
| 482. |
_ In which type of welding a gas shield, a consumable electrode is used and the welding can be done in all positions.$? |
| A. | ARC welding |
| B. | Submerged ARC welding |
| C. | TIG welding |
| D. | MIG welding |
| Answer» E. | |
| 483. |
_ Which of the following arc welding processes does not use consumable electrodes?$? |
| A. | GMAW |
| B. | GTAW |
| C. | Submerged Arc Welding |
| D. | None of these |
| Answer» C. Submerged Arc Welding | |
| 484. |
_ 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$? |
| A. | 0.2 mm |
| B. | 10 mm |
| C. | 20 mm |
| D. | 100 mm |
| Answer» D. 100 mm | |
| 485. |
_ In metal machining, the zone where the heat is generated due to friction between the moving chip and the tool face, is called$? |
| A. | Friction zone |
| B. | Work-tool contact zone |
| C. | Shear zone |
| D. | None of these |
| Answer» B. Work-tool contact zone | |
| 486. |
_ Tumbler gears in lathe are used to$? |
| A. | Reduce the spindle speed |
| B. | Cut gears |
| C. | Give desired direction of movement to the lathe carriage |
| D. | Drill a workpiece |
| Answer» D. Drill a workpiece | |
| 487. |
_ A drill considered as a cutting tool having zero rake, is known as a$? |
| A. | Flat drill |
| B. | Straight fluted drill |
| C. | Parallel shank twist drill |
| D. | Tapered shank twist drill |
| Answer» C. Parallel shank twist drill | |
| 488. |
_ The cutting fluid mostly used for machining alloy steels is$? |
| A. | Water |
| B. | Soluble oil |
| C. | Dry |
| D. | Sulphurised mineral oil |
| Answer» E. | |
| 489. |
_ In drilling softer materials, the cutting speed is ___________ as compared to harder materials.$? |
| A. | Same |
| B. | Low |
| C. | High |
| D. | None of these |
| Answer» D. None of these | |
| 490. |
_ The grade of grinding wheel depends upon$? |
| A. | Hardness of the material being ground |
| B. | Speed of wheel and work |
| C. | Condition of grinding machine |
| D. | All of these |
| Answer» E. | |
| 491. |
_ A solid cylinder of diameter 100 mm and height 50 mm is forged between two frictionless flat dies to a height of 25 mm. The percentage change in diameter is$? |
| A. | 0 |
| B. | 2.07 |
| C. | 20.7 |
| D. | 41.4 |
| Answer» E. | |
| 492. |
_ The usual value of the point angle of a drill is$? |
| A. | 70° |
| B. | 100° |
| C. | 118° |
| D. | 130° |
| Answer» D. 130¬¨‚àû | |
| 493. |
_ The tool life in case of a grinding wheel is the time$? |
| A. | Between two successive regrinds of the wheel |
| B. | Taken for the wheel to be balanced |
| C. | Taken between two successive wheel dressings |
| D. | Taken for a wear of 1 mm on its diameter |
| Answer» D. Taken for a wear of 1 mm on its diameter | |
| 494. |
_ Flank wear occurs mainly on the$? |
| A. | Nose part, front relief face and side relief face of the cutting tool |
| B. | Face of the cutting tool at a short distance from the cutting edge |
| C. | Cutting edge only |
| D. | Front face only |
| Answer» B. Face of the cutting tool at a short distance from the cutting edge | |
| 495. |
_ The swing diameter over the bed is ________ the height of the centre measured from the bed of the lathe.$? |
| A. | Equal to |
| B. | Twice |
| C. | Thrice |
| D. | One-half |
| Answer» C. Thrice | |
| 496. |
_ Negative rakes are used for$? |
| A. | Carbide tools |
| B. | Heavy loads |
| C. | Harder materials |
| D. | All of these |
| Answer» E. | |
| 497. |
_ A shaft has a dimension, œÜ9 +0.025‚Å∫‚Å∞‚à ô‚Å∞‚Å∞‚Åπ, the respective values of fundamental deviation and tolerance are$? |
| A. | ‚à í0.025, ¬±0.008 |
| B. | ‚à í0.025, 0.016 |
| C. | ‚à í0.009, ¬± 0.008 |
| D. | ‚à í0.009, 0.016 |
| Answer» E. | |
| 498. |
_ When 3-2-1 principle is used to support and locate a three dimensional work-piece during machining, the number of degrees of freedom that are restricted is$? |
| A. | 7 |
| B. | 8 |
| C. | 9 |
| D. | 10 |
| Answer» D. 10 | |
| 499. |
_ A taper tap has$? |
| 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 | |
| 500. |
_ 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. | |