MCQOPTIONS
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MCQOPTIONS
This section includes 991 Mcqs, each offering curated multiple-choice questions to sharpen your GATE (Mechanical Engineering) knowledge and support exam preparation. Choose a topic below to get started.
| 351. |
The elasticity is the property of a material which enables it to |
| A. | Regains its original shape after deformation when the external forces are removed |
| B. | Draw into wires by the application of a tensile force |
| C. | Resists fracture due to high impact loads |
| D. | Retain deformation produced under load permanently |
| Answer» B. Draw into wires by the application of a tensile force | |
| 352. |
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 | |
| 353. |
The algebraic difference between the maximum limit and the basic size is called |
| A. | Lower deviation |
| B. | Upper deviation |
| C. | Actual deviation |
| D. | Mean deviation |
| Answer» C. Actual deviation | |
| 354. |
When a hole of diameter ‘d’ is punched in a metal of thickness 't', then the force required to punch a hole is equal to (where τu = Ultimate shear strength of the material of the plate) |
| A. | d.t.τu |
| B. | πd.t.τu |
| C. | π/4 × d².τu |
| D. | π/4 × d² × tτu |
| Answer» C. π/4 × d².τu | |
| 355. |
The smallest diameter of an external or internal screw thread is known as |
| A. | Minor diameter |
| B. | Major diameter |
| C. | Pitch diameter |
| D. | None of these |
| Answer» B. Major diameter | |
| 356. |
The largest diameter of an external or internal screw thread is known as |
| A. | Minor diameter |
| B. | Major diameter |
| C. | Pitch diameter |
| D. | None of these |
| Answer» C. Pitch diameter | |
| 357. |
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 | |
| 358. |
In order to avoid tearing of the plate at edge, the distance from the center line of the rivet hole to the nearest edge of the plate in terms of dia. of rivet d should be equal to |
| A. | 1 d |
| B. | 1.25 d |
| C. | 1.5 d |
| D. | 1.75 d |
| Answer» D. 1.75 d | |
| 359. |
For hardening alloy steels and high speed steels, they are heated to |
| A. | 1100 to 1300°C |
| B. | 1300 to 1500°C |
| C. | 500 to 600°C |
| D. | 700 to 900°C |
| Answer» B. 1300 to 1500°C | |
| 360. |
The gears are termed as medium velocity gears, if their peripheral velocity is |
| A. | 1-3 m/s |
| B. | 3-15 m/s |
| C. | 15-30 m/s |
| D. | 30-50 m/s |
| Answer» C. 15-30 m/s | |
| 361. |
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 | |
| 362. |
Guest's theory is used for |
| A. | Brittle materials |
| B. | Ductile materials |
| C. | Elastic materials |
| D. | Plastic materials |
| Answer» C. Elastic materials | |
| 363. |
Rankine's theory is used for |
| A. | Brittle materials |
| B. | Ductile materials |
| C. | Elastic materials |
| D. | Plastic materials |
| Answer» B. Ductile materials | |
| 364. |
The maximum normal stress theory is used for |
| A. | Plastic materials |
| B. | Brittle materials |
| C. | Non-ferrous materials |
| D. | Ductile materials |
| Answer» C. Non-ferrous materials | |
| 365. |
The maximum shear stress theory is used for |
| A. | Brittle materials |
| B. | Ductile materials |
| C. | Plastic materials |
| D. | Nonferrous materials |
| Answer» C. Plastic materials | |
| 366. |
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 | |
| 367. |
If the centre distance of the mating gears having involute teeth is varied within limits, the velocity ratio |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | None of these |
| Answer» D. None of these | |
| 368. |
The steel pulleys are __________ in weight than cast iron pulleys of the same capacity. |
| A. | Heavier |
| B. | Lighter |
| C. | Moderate |
| D. | None of these |
| Answer» C. Moderate | |
| 369. |
If the centre distance of the mating gears having involute teeth is increased, then the pressure angle |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | None of these |
| Answer» B. Decreases | |
| 370. |
The bearings of heavy series have capacity __________ over the medium series. |
| A. | 20 to 30% |
| B. | 10 to 20% |
| C. | 30 to 40% |
| D. | 40 to 50% |
| Answer» B. 10 to 20% | |
| 371. |
The buckling load will be maximum for a column, if |
| A. | One end of the column is clamped and the other end is free |
| B. | Both ends of the column are clamped |
| C. | Both ends of the column are hinged |
| D. | One end of the column is hinged and the other end is free |
| Answer» C. Both ends of the column are hinged | |
| 372. |
The yield point in static loading is __________ as compared to fatigue loading. |
| A. | Higher |
| B. | Lower |
| C. | Same |
| D. | None of these |
| Answer» B. Lower | |
| 373. |
In designing thick cylinders, the equation used is |
| A. | Lame's equation |
| B. | Birnie's equation |
| C. | Clavarinos' equation |
| D. | All of these |
| Answer» E. | |
| 374. |
A double strap butt joint (with equal straps) is |
| A. | Always in single shear |
| B. | Always in double shear |
| C. | Either in single shear or double shear |
| D. | Any one of these |
| Answer» C. Either in single shear or double shear | |
| 375. |
The valve rod in a steam engine is connected to an eccentric rod by |
| A. | Cotter joint |
| B. | Bolted joint |
| C. | Knuckle joint |
| D. | Universal coupling |
| Answer» D. Universal coupling | |
| 376. |
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 | |
| 377. |
In radial cams, the follower moves |
| A. | In a direction parallel to the cam axis |
| B. | In a direction perpendicular 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 | |
| 378. |
Which of the following is not correct procedure to increase the fatigue limit? |
| A. | Cold working |
| B. | Shot peening |
| C. | Surface decarburisation |
| D. | Under stressing |
| Answer» D. Under stressing | |
| 379. |
The creep in the belt is due to |
| A. | Effect of temperature on belt |
| B. | Material of belt |
| C. | Unequal extensions in the belt due to tight and slack side tensions |
| D. | Stresses beyond elastic limit of belt material |
| Answer» D. Stresses beyond elastic limit of belt material | |
| 380. |
A taper key which fits half in the key way of the hub and half in the key way of shaft, is known as |
| A. | Angular bevel gears |
| B. | Mitre gears |
| C. | Crown Bevel gears |
| D. | Internal bevel gears |
| Answer» C. Crown Bevel gears | |
| 381. |
A tapered key which fits in a key-way in the hub and is flat on the shaft, is known as |
| A. | Woodruff key |
| B. | Feather key |
| C. | Flat saddle key |
| D. | Gib head key |
| Answer» D. Gib head key | |
| 382. |
A tapered key which fits in a key way in the hub and is flat on the shaft, is known as |
| A. | Feather key |
| B. | Gib-head key |
| C. | Wood ruff key |
| D. | Flat saddle key |
| Answer» E. | |
| 383. |
The standard length of the shaft is |
| A. | 6 m |
| B. | 5 m |
| C. | 7 m |
| D. | All of these |
| Answer» E. | |
| 384. |
The taper on a rectangular sunk key is |
| A. | 1 in 16 |
| B. | 1 in 32 |
| C. | 1 in 48 |
| D. | 1 in 100 |
| Answer» E. | |
| 385. |
The ends of the leaves of a semi-elliptical leaf spring are made triangular in order to |
| A. | Obtain variable moment of inertia (I) in each leaf |
| B. | Permit each leaf to act as an overhanging beam |
| C. | Have variable bending moment (M) in each leaf |
| D. | Make M/I constant throughout the length of the leaf |
| Answer» E. | |
| 386. |
Failure of a material is called fatigue when it fails |
| A. | At the elastic limit |
| B. | Below the elastic limit |
| C. | At the yield point |
| D. | Below the yield point |
| Answer» E. | |
| 387. |
In thrust bearings, the load acts |
| A. | Along the axis of rotation |
| B. | Parallel to the axis of rotation |
| C. | Perpendicular to the axis of rotation |
| D. | In any direction |
| Answer» B. Parallel to the axis of rotation | |
| 388. |
The helix angle for single helical gears ranges from |
| A. | 10° to 15° |
| B. | 15° to 20° |
| C. | 20° to 35° |
| D. | 35° to 50° |
| Answer» D. 35° to 50° | |
| 389. |
Crowning on pulley helps |
| A. | In decreasing the slip of the belt |
| B. | In increasing the slip of the belt |
| C. | To keep the belt in centre on a pulley while it is in motion |
| D. | To increase pulley life |
| Answer» D. To increase pulley life | |
| 390. |
Factor of safety for fatigue loading is the ratio of |
| A. | Elastic limit to the working stress |
| B. | Elastic limit to the yield point |
| C. | Endurance limit to the working stress |
| D. | Young's modulus to the ultimate tensile strength |
| Answer» D. Young's modulus to the ultimate tensile strength | |
| 391. |
When the length of the journal is equal to the diameter of the journal, then the bearing is said to be a |
| A. | Short bearing |
| B. | Long bearing |
| C. | Medium bearing |
| D. | Square bearing |
| Answer» E. | |
| 392. |
The centre distance between two meshing involute gears is equal to |
| A. | Sum of base circle radii/cosφ |
| B. | Difference of base circle radii/cosφ |
| C. | Sum of pitch circle radii/cosφ |
| D. | Difference of pitch circle radii/cosφ |
| Answer» B. Difference of base circle radii/cosφ | |
| 393. |
Gear box is used |
| A. | To produce torque |
| B. | For speed reduction |
| C. | To obtain variable speeds |
| D. | To increase efficiency of system |
| Answer» D. To increase efficiency of system | |
| 394. |
The railway carriage couplings have |
| A. | Square threads |
| B. | Acme threads |
| C. | Knuckle threads |
| D. | Buttress threads |
| Answer» E. | |
| 395. |
According to Indian standard specifications, 100 H6/g5 means that the |
| A. | Basic size is 100 mm |
| B. | Actual size is 100 mm |
| C. | Difference between the actual size and basic size is 100 mm |
| D. | None of the above |
| Answer» B. Actual size is 100 mm | |
| 396. |
Split nut is a locking device in which |
| A. | One smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming |
| B. | A slot is cut partly in middle of nut and then slot reduced by tightening screw |
| C. | A hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip |
| D. | Through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter pin splitted and bent in reverse direction at the other end |
| Answer» C. A hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip | |
| 397. |
The anti-friction bearings |
| A. | Have low starting and low running friction at moderate speeds |
| B. | Have high initial cost |
| C. | Can carry both radial and thrust loads |
| D. | All of these |
| Answer» E. | |
| 398. |
Which of the following is an anti-friction bearing? |
| A. | Journal bearing |
| B. | Pedestal bearing |
| C. | Collar bearing |
| D. | Needle bearing |
| Answer» E. | |
| 399. |
The ratio of driving tensions in V-belt drives is __________ flat belt drives. |
| A. | Equal to |
| B. | sin α times more than |
| C. | sin α times less than |
| D. | cosec α times more than |
| Answer» E. | |
| 400. |
The distribution of the forces along the length of key fitted in a shaft |
| A. | Varies linearly |
| B. | Is uniform throughout |
| C. | Varies exponentially, being more near the torque-input end |
| D. | Varies exponentially, being less near the torque-input end |
| Answer» D. Varies exponentially, being less near the torque-input end | |