MCQOPTIONS
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MCQOPTIONS
This section includes 1003 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 351. |
The objective of idler pulley in belt drive is to%! |
| A. | Decrease the tendency of belt to slip |
| B. | Increase the power transmission capacity |
| C. | Increase the wrap angle and belt tension |
| D. | All the above objectives |
| Answer» E. | |
| 352. |
The groove angle of the pulley for rope drive is usually%! |
| A. | 20° |
| B. | 35° |
| C. | 45° |
| D. | 60° |
| Answer» D. 60¬¨‚àû | |
| 353. |
In a horizontal flat belt drive, it is customary to use%! |
| A. | Bottom side of belt as slack side |
| B. | Top side of belt as slack side |
| C. | Idler pulley |
| D. | None of the above |
| Answer» C. Idler pulley | |
| 354. |
When a machine member is subjected to torsion, the torsional shear stress set up in the member is%! |
| A. | Zero at both the centroidal axis and outer surface of the member |
| B. | Maximum at both the centroidal axis and outer surface of the member |
| C. | Zero at the centroidal axis and maximum at the outer surface of the member |
| D. | Maximum at the centroidal axis and zero at the outer surface of the member |
| Answer» C. Zero at the centroidal axis and maximum at the outer surface of the member | |
| 355. |
Stress concentration is caused due to%! |
| A. | Variation in properties of material from point to point in a member |
| B. | Pitting at points or areas at which loads on a member are applied |
| C. | Abrupt change of section |
| D. | All of the above |
| Answer» E. | |
| 356. |
In cylindrical cams, the follower moves%! |
| A. | In a direction perpendicular to the cam axis |
| B. | In a direction parallel to the cam axis |
| C. | In any direction irrespective of cam axis |
| D. | Along the cam axis |
| Answer» C. In any direction irrespective of cam axis | |
| 357. |
The piston rod of a steam engine is usually connected to the cross-head by means of%! |
| A. | Bolted joint |
| B. | Knuckle joint |
| C. | Cotter joint |
| D. | Universal joint |
| Answer» D. Universal joint | |
| 358. |
In a turnbuckle, if one of the rods has left hand threads, then the other rod will have%! |
| A. | Right hand threads |
| B. | Left hand threads |
| C. | Multiple threads |
| D. | Pointed threads |
| Answer» B. Left hand threads | |
| 359. |
The maximum stress due to stress concentration in a bar having circular transverse hole, as compared to its static stress without hole will be%! |
| A. | Same in both cases |
| B. | 2 times more |
| C. | 3 times more |
| D. | 4 times more |
| Answer» D. 4 times more | |
| 360. |
Which of the following spring is used in mechanical wrist watch?%! |
| A. | Helical compression spring |
| B. | Spiral spring |
| C. | Torsion spring |
| D. | Belleville spring |
| Answer» D. Belleville spring | |
| 361. |
The width of the pulley should be __________ width of the belt.%! |
| A. | Equal to |
| B. | Less than |
| C. | Greater than |
| D. | None of these |
| Answer» D. None of these | |
| 362. |
The design calculations for members subject to fluctuating loads with the same factor of safety, yield the most conservative estimates when using%! |
| A. | Gerber relation |
| B. | Soderberg relation |
| C. | Goodman relation |
| D. | None of these |
| Answer» D. None of these | |
| 363. |
In designing a sleeve coupling, outer diameter of the sleeve is taken as (where d = Diameter of the shaft)%! |
| A. | d + 17 mm |
| B. | 2d + 13 mm |
| C. | 2d + 20 mm |
| D. | 3.5d |
| Answer» C. 2d + 20 mm | |
| 364. |
The wear load should be __________ the dynamic load.%! |
| A. | Equal to |
| B. | Less than |
| C. | Greater than |
| D. | None of these |
| Answer» C. Greater than | |
| 365. |
In a partial journal bearing, the angle of contact of the bearing with the journal is%! |
| A. | 120° |
| B. | 180° |
| C. | 270° |
| D. | 360° |
| Answer» B. 180¬¨‚àû | |
| 366. |
The connecting rod bolts are tightened up so that tightening stress%! |
| A. | Is just sufficient to hold parts together |
| B. | Approaches yield point |
| C. | Is 50% of yield point |
| D. | Is about yield point divided by safety factor |
| Answer» C. Is 50% of yield point | |
| 367. |
When bevel gears connect two shafts whose axes intersect at an angle greater than a right angle and one of the bevel gears has a pitch angle of 90°, then they are known as%! |
| A. | Crown bevel gears |
| B. | Angular bevel gears |
| C. | Mitre gears |
| D. | Internal bevel gears |
| Answer» B. Angular bevel gears | |
| 368. |
The objective of caulking in a riveted joint is to make the joint%! |
| A. | Free from corrosion |
| B. | Stronger in tension |
| C. | Free from stress |
| D. | Leak-proof |
| Answer» E. | |
| 369. |
Guest's theory of failure is applicable for following type of materials%! |
| A. | Brittle |
| B. | Ductile |
| C. | Elastic |
| D. | Plastic |
| Answer» C. Elastic | |
| 370. |
The ratio of the ultimate stress to the design stress is known as%! |
| A. | Elastic limit |
| B. | Strain |
| C. | Factor of safety |
| D. | Bulk modulus |
| Answer» D. Bulk modulus | |
| 371. |
In a flange coupling, the keys are staggered at __________ along the circumference of the shafts in order to divide the weakening effect caused by key ways.%! |
| A. | 90° |
| B. | 135° |
| C. | 160° |
| D. | 180° |
| Answer» B. 135¬¨‚àû | |
| 372. |
Idler pulley is used for%! |
| A. | Increasing velocity ratio |
| B. | For applying tension |
| C. | Changing the direction of motion of belt |
| D. | All of these |
| Answer» C. Changing the direction of motion of belt | |
| 373. |
In skew bevel gearing, the axes of shafts are%! |
| A. | Intersecting and the teeth are curved |
| B. | Non-intersecting and nonparallel and the teeth are curved |
| C. | Non-intersecting and non-parallel and the teeth are straight |
| D. | None of the above |
| Answer» D. None of the above | |
| 374. |
The ball bearings are provided with a cage%! |
| A. | To reduce friction |
| B. | To facilitate slipping of balls |
| C. | To prevent the lubricant from flowing out |
| D. | To maintain the balls at a fixed distance apart |
| Answer» E. | |
| 375. |
Tensile strength of a mild steel specimen can be roughly predicted from following hardness test%! |
| A. | Brinell |
| B. | Rockwell |
| C. | Vickers |
| D. | None of the above |
| Answer» B. Rockwell | |
| 376. |
When a nut is tightened by placing a washer below it, the bolt will be subjected to following type of loads%! |
| A. | Compression |
| B. | Tension |
| C. | Shear |
| D. | Combined loads |
| Answer» C. Shear | |
| 377. |
When a metal or alloy is cold worked,%! |
| A. | Its hardness and strength increases |
| B. | It is worked below recrystallization temperature |
| C. | Both (A) and (B) |
| D. | None of these |
| Answer» D. None of these | |
| 378. |
A backing ring is used inside the pipe joint when making a%! |
| A. | Butt weld |
| B. | Fillet weld |
| C. | Sleeve weld |
| D. | Socket weld |
| Answer» B. Fillet weld | |
| 379. |
The surface finish factor for a mirror polished material is%! |
| A. | 0.45 |
| B. | 0.65 |
| C. | 0.85 |
| D. | 1 |
| Answer» E. | |
| 380. |
In V-belt drive, belt touches%! |
| A. | At bottom |
| B. | At sides only |
| C. | Both at bottom and sides |
| D. | Could touch anywhere |
| Answer» C. Both at bottom and sides | |
| 381. |
In order to obtain bolt of uniform strength%! |
| A. | Increase shank diameter |
| B. | Increase its length |
| C. | Drill an axial hole through head up to threaded portion so that shank area is equal to root area of thread |
| D. | Tighten die bolt properly |
| Answer» D. Tighten die bolt properly | |
| 382. |
A double fillet welded joint with parallel fillet weld of length 'l' and leg 's' is subjected to a tensile force 'P'. Assuming uniform stress distribution, the shear stress in the weld is given by%! |
| A. | ‚à ö2P/s.l |
| B. | P/2.s.l |
| C. | P/‚à ö2.s.l |
| D. | 2P/s.l |
| Answer» D. 2P/s.l | |
| 383. |
Two shafts A and B are made of the same material. The diameter of shaft A is twice as that of shaft B. The power transmitted by the shaft A will be __________ of shaft B.%! |
| A. | Twice |
| B. | Four times |
| C. | Eight times |
| D. | Sixteen times |
| Answer» D. Sixteen times | |
| 384. |
A single strap butt joint is always in __________ shear.%! |
| A. | Single |
| B. | Double |
| C. | Triple share |
| D. | None of these |
| Answer» B. Double | |
| 385. |
A screw will be self locking, if%! |
| A. | Friction angle is less than helix angle |
| B. | Friction angle is more than helix angle |
| C. | Friction angle is equal to helix angle |
| D. | Efficiency of screw is 100% |
| Answer» C. Friction angle is equal to helix angle | |
| 386. |
The washer is generally specified by its%! |
| A. | Outer diameter |
| B. | Hole diameter |
| C. | Thickness |
| D. | Mean diameter |
| Answer» C. Thickness | |
| 387. |
The centrifugal tension in belts%! |
| A. | Decreases the power transmitted |
| B. | Increases the power transmitted |
| C. | Increase the wrap angle |
| D. | Increases the belt tension without increasing power transmission |
| Answer» E. | |
| 388. |
A metal pipe of 1 m diameter contains a fluid having a pressure of 1 N/mm². If the permissible tensile stress in the metal is 20 N/mm², then the thickness of the metal required for making the pipe will be%! |
| A. | 5 mm |
| B. | 10 mm |
| C. | 15 mm |
| D. | 25 mm |
| Answer» E. | |
| 389. |
*$_In helical bevel gearing, the axes of shafts are __________ and the teeth are curved.? |
| A. | Intersecting |
| B. | Non-intersecting and non-parallel |
| C. | Intersecting and non-parallel |
| D. | None of these |
| Answer» C. Intersecting and non-parallel | |
| 390. |
*$_In testing a material for endurance strength, it is subjected to? |
| A. | Static load |
| B. | Dynamic load |
| C. | Impact load |
| D. | Completely reversed load |
| Answer» E. | |
| 391. |
*$_A shaft coupling should? |
| A. | Be easy to connect or disconnect |
| B. | Transmit full power of the shaft |
| C. | Hold the shafts in perfect alignment |
| D. | All of these |
| Answer» E. | |
| 392. |
*$_Which is positive drive?? |
| A. | Flat belt drive |
| B. | V belt drive |
| C. | Crossed belt drive |
| D. | Timing belt |
| Answer» E. | |
| 393. |
*$_In designing a sleeve coupling, outer diameter of the sleeve is taken as (where d = Diameter of the shaft)? |
| A. | d + 17 mm |
| B. | 2d + 13 mm |
| C. | 2d + 20 mm |
| D. | 3.5d |
| Answer» C. 2d + 20 mm | |
| 394. |
*$_The wear load should be __________ the dynamic load.? |
| A. | Equal to |
| B. | Less than |
| C. | Greater than |
| D. | None of these |
| Answer» C. Greater than | |
| 395. |
*$_The connecting rod bolts are tightened up so that tightening stress? |
| A. | Is just sufficient to hold parts together |
| B. | Approaches yield point |
| C. | Is 50% of yield point |
| D. | Is about yield point divided by safety factor |
| Answer» C. Is 50% of yield point | |
| 396. |
*$_When bevel gears connect two shafts whose axes intersect at an angle greater than a right angle and one of the bevel gears has a pitch angle of 90°, then they are known as? |
| A. | Crown bevel gears |
| B. | Angular bevel gears |
| C. | Mitre gears |
| D. | Internal bevel gears |
| Answer» B. Angular bevel gears | |
| 397. |
*$_In order to remove internal stresses produced by hardening the steel, the process usually adopted is? |
| A. | Tempering |
| B. | Normalizing |
| C. | Annealing |
| D. | Spheroidizing |
| Answer» B. Normalizing | |
| 398. |
*$_Yield point in fatigue loading as compared to static loading is? |
| A. | Same |
| B. | Higher |
| C. | Lower |
| D. | Depends on other factors |
| Answer» D. Depends on other factors | |
| 399. |
*$_Spring index is? |
| A. | Ratio of coil diameter to wire diameter |
| B. | Load required to produce unit deflection |
| C. | Its capability of storing energy |
| D. | Indication of quality of spring |
| Answer» B. Load required to produce unit deflection | |
| 400. |
*$_A special case of ductility which permits materials to be rolled or hammered into thin sheets, is called? |
| A. | Plasticity |
| B. | Elasticity |
| C. | Ductility |
| D. | Malleability |
| Answer» E. | |