McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 301. |
Which of the following is a positive drive? |
| A. | Rope drive |
| B. | Flat belt drive |
| C. | Gear drive |
| D. | V-belt drive |
| E. | None of the above |
| Answer» C. Gear drive | |
| 302. |
The critical speed of a shaft can be increased by |
| A. | shaft diameter may be increased |
| B. | bearings may be brought closer together |
| C. | Increasing the diameter of threaded portion |
| D. | frictionless bearings be used |
| E. | reciprocating load may be applied |
| Answer» B. bearings may be brought closer together | |
| 303. |
A chain drive is used for |
| A. | Distance is no criteria for such drives |
| B. | Medium distance |
| C. | Long distance |
| D. | Very short distance |
| E. | Short distance |
| Answer» A. Distance is no criteria for such drives | |
| 304. |
In a tap set, the first tap used in thread cutting is |
| A. | Any one |
| B. | Taper tap |
| C. | Straight tap |
| D. | Bottom tap |
| E. | Plug tap |
| Answer» B. Taper tap | |
| 305. |
The pressure angle an involute gear profile gear |
| A. | Changes with position |
| B. | Depends on speed of operation |
| C. | Depends on gear pitch and clearance |
| D. | Remains constant |
| E. | None of the above |
| Answer» D. Remains constant | |
| 306. |
When both pinion and gear are made of the same material, then from the design point of view |
| A. | Pinion is the determining factor |
| B. | Gear is the determining factor |
| C. | Any one of the two may be taken as determining factor |
| D. | Criteria is strength of any one of the teeth |
| E. | None of the above |
| Answer» A. Pinion is the determining factor | |
| 307. |
A rope sheave of balance weight for the cage is supported on an axle 25 cm. The maximum tension in the rope is 1500 kg. For safe design the point of application of the load should be considered at |
| A. | Anywhere along the span |
| B. | Case should be analysed for various positions of load along the span |
| C. | Data should be taken from hand books |
| D. | End points |
| E. | Middle of span |
| Answer» E. Middle of span | |
| 308. |
A belt when struck vibrates at a particular frequency determined by |
| A. | shape of bell |
| B. | size of ball |
| C. | material of bell |
| D. | All of the above |
| E. | Increasing the diameter of threaded portion |
| Answer» D. All of the above | |
| 309. |
In rolling bearings lubricant viscosity |
| A. | is decided on the basis of load |
| B. | decides the life of bearing |
| C. | is not determined by load |
| D. | Increasing the diameter of threaded portion |
| E. | is determined by operating speed |
| Answer» C. is not determined by load | |
| 310. |
Which dynamometer will be most suitable for measuring the BHP of an automobile engine? |
| A. | Electrical generator type |
| B. | Electrical resistance type |
| C. | None of the above |
| D. | Hydraulic type |
| E. | None of the above |
| Answer» D. Hydraulic type | |
| 311. |
The property which refers to the relative ease with which a material can be cut is known as |
| A. | Malleability |
| B. | Stiffness |
| C. | Machinability |
| D. | Chrome steel |
| E. | Softness |
| Answer» C. Machinability | |
| 312. |
Fatigue failure starts at some |
| A. | hole |
| B. | Increasing the diameter of threaded portion |
| C. | star |
| D. | point |
| E. | discontinuity |
| Answer» E. discontinuity | |
| 313. |
Sintered bearing |
| A. | Increasing the diameter of threaded portion |
| B. | high rpm applications |
| C. | find application is instruments |
| D. | are self-lubricating type suitable for placs where regular maintensance is difficult |
| E. | are used for under water applications |
| Answer» D. are self-lubricating type suitable for placs where regular maintensance is difficult | |
| 314. |
Hysteresis and eddy current losses in bearings are typical to |
| A. | high speed bearings |
| B. | bearings for induction motors |
| C. | electromagnetic bearings |
| D. | Increasing the diameter of threaded portion |
| E. | foil bearings |
| Answer» C. electromagnetic bearings | |
| 315. |
An induction motor meant for operation on 60 cycles per second is connected to a supply having 50 cycles per second. What will happen |
| A. | The motor will not start |
| B. | The motor will run with peculiar noise |
| C. | The motor will get burnt |
| D. | The motor will not take load |
| E. | The operating speed of the motor will be less than the rated |
| Answer» E. The operating speed of the motor will be less than the rated | |
| 316. |
The buckling load depends on |
| A. | Modulus of elasticity |
| B. | Slendemess ratio |
| C. | Cross-sectional area |
| D. | All of the above |
| E. | None of the above |
| Answer» D. All of the above | |
| 317. |
The maximum efficiency of a scres jack provided with square threads and angle of friction 30? will be |
| A. | 47% |
| B. | 41% |
| C. | 25% |
| D. | 33% |
| E. | 55.50% |
| Answer» D. 33% | |
| 318. |
The bearing used in railway wagons are |
| A. | Roller bearings |
| B. | Ball bearings |
| C. | Bush bearings |
| D. | Journal bearings |
| E. | Thrust bearings |
| Answer» A. Roller bearings | |
| 319. |
Which of the following operation causes residual compressive stress on the surface of the material? |
| A. | Surface rolling |
| B. | Shot peening |
| C. | Induction hardening |
| D. | All of the above |
| E. | Increasing the diameter of threaded portion |
| Answer» D. All of the above | |
| 320. |
Which type of bearing is provided at the big end of connecting rod? |
| A. | Ball bearing |
| B. | Needle bearing |
| C. | Cast iron bearing |
| D. | Roller bearing |
| E. | Ball bearing |
| Answer» E. Ball bearing | |
| 321. |
Which of the following fits can be used for selective assembly? |
| A. | Loose fit |
| B. | 10 kg |
| C. | Shrink fit |
| D. | Free fit |
| E. | Medium fit |
| Answer» C. Shrink fit | |
| 322. |
A block weighing 1000 kg rests on a horizontal surface. The coefficient of friction is 0.3 (both static and kinetic). What frictional force will be developed if the force applied to the block in the direction parallel to the horizontal surface is 40 kg |
| A. | 40 kg |
| B. | 33.33 kg |
| C. | 30 kg |
| D. | 10 kg |
| E. | 12 kg |
| Answer» C. 30 kg | |
| 323. |
Which type of coupling will be preferred for connecting two shafts having relative speed? |
| A. | Flange coupling |
| B. | Flexible flange coupling |
| C. | Muff coupling |
| D. | Fluid coupling |
| E. | Any of the above |
| Answer» D. Fluid coupling | |
| 324. |
As far as possible adhesive joints should be loaded in |
| A. | shear |
| B. | torsion |
| C. | compression |
| D. | Any of the above |
| E. | Increasing the diameter of threaded portion |
| Answer» A. shear | |
| 325. |
The basic shaft is |
| A. | One which has no upper deviation |
| B. | One which has no lower deviation |
| C. | One which has least deviation on both upper and lower side |
| D. | Does not exist |
| E. | None of the above |
| Answer» A. One which has no upper deviation | |
| 326. |
In flange coupling the weakest element should be |
| A. | Shaft |
| B. | Flange |
| C. | Key |
| D. | Bolts |
| E. | Bolt bush |
| Answer» C. Key | |
| 327. |
The light gauge steel structural members are generally |
| A. | fabricated fromthick sections |
| B. | hot rolled |
| C. | Increasing the diameter of threaded portion |
| D. | cold formed |
| E. | casted |
| Answer» D. cold formed | |
| 328. |
In general, the bunkers are constructed |
| A. | circular and polygonal in plan |
| B. | square and rectangular in plan |
| C. | Increasing the diameter of threaded portion |
| D. | hexagonal in plan |
| E. | elliptical in plan |
| Answer» B. square and rectangular in plan | |
| 329. |
In case of a cotter joint the compressive load is transmitted from one rod to another rod |
| A. | Directly |
| B. | Via cotter |
| C. | Via cotter pin |
| D. | Via collar |
| E. | None of the above |
| Answer» D. Via collar | |
| 330. |
The shock absorbing capacity of a bolt is increased by |
| A. | Proper tightening |
| B. | Use of a spring washer |
| C. | Making shank diameter equal to the core diameter |
| D. | Preventingstress concentration any where in the bolt |
| E. | None of the above |
| Answer» C. Making shank diameter equal to the core diameter | |
| 331. |
When a nut is tightened by placing a washer under it, the bolt tends to fall in |
| A. | compression |
| B. | tension |
| C. | shear |
| D. | none of the above |
| E. | Cast steel |
| Answer» B. tension | |
| 332. |
100 m of water column is equal to |
| A. | 1 kN/m2 |
| B. | 1000 kN/m2 |
| C. | 10 kN/m2 |
| D. | 100 kN/m2 |
| E. | 0.1 kN/m2 |
| Answer» B. 1000 kN/m2 | |
| 333. |
Jaw clutches are generally used for |
| A. | high horse power low rpm applications |
| B. | low horse power high rpm applications |
| C. | high horse power high rpm applications |
| D. | low horse power low rpm applications |
| E. | Increasing the diameter of threaded portion |
| Answer» D. low horse power low rpm applications | |
| 334. |
Which of the following fit can be used for interchangeable assembly |
| A. | 10 kg |
| B. | Tight |
| C. | Sung |
| D. | Medium force |
| E. | Wringing |
| Answer» C. Sung | |
| 335. |
Within elastic limits the greatest amount of strain energy per unit volume that a material can absorb is known as |
| A. | Resilience |
| B. | Shock proof energy |
| C. | Proof resilience |
| D. | Impact energy limit |
| E. | Strain hardening |
| Answer» C. Proof resilience | |
| 336. |
A double start screw has |
| A. | Two threads per inch |
| B. | Fine threads |
| C. | Coarse threads |
| D. | Two threads at some phase angle |
| E. | None of the above |
| Answer» D. Two threads at some phase angle | |
| 337. |
For butt welding of two plates each of which is 25 mm thick, the best process would be |
| A. | Electron slag welding |
| B. | Submerged are welding |
| C. | MIG welding |
| D. | Gas welding |
| E. | TIG welding |
| Answer» A. Electron slag welding | |
| 338. |
The stretching in a belt is controlled by |
| A. | Increasing belt velocity |
| B. | Reducing stress in the belt |
| C. | Increasing belt thickness |
| D. | Reducing belt length |
| E. | Increasing centre distance |
| Answer» B. Reducing stress in the belt | |
| 339. |
A positive infinitely variable (P.I.V.) system utilises |
| A. | Variable pitch chain drive system |
| B. | Hydraulic variable speed drive |
| C. | Rolling contact variable speed |
| D. | Vee belt variable speed system |
| E. | None of the above |
| Answer» A. Variable pitch chain drive system | |
| 340. |
Which oil has highest specific gravity? |
| A. | Castor |
| B. | Sperm |
| C. | Cotton Seed |
| D. | Petroleum |
| E. | Turpentine |
| Answer» A. Castor | |
| 341. |
Within the elastic range, the bulk modulus of elasticity is defined as the ratio of |
| A. | hydrostatic stress to the volumetric strain |
| B. | shearing stress to the shearing strain |
| C. | longitudinal stress to the longitudinal strain |
| D. | none of the above |
| E. | Increasing the diameter of threaded portion |
| Answer» A. hydrostatic stress to the volumetric strain | |
| 342. |
In case of aircraft body the type of welding generally used is |
| A. | Gas welding |
| B. | Arc welding |
| C. | Spot welding |
| D. | Seam welding |
| E. | None of the above |
| Answer» E. None of the above | |
| 343. |
A spring deflects 50 mm under a 250 kg load. If the load is applied gradually, the energy absorbed by the spring will be |
| A. | 2500 kg-cm |
| B. | 312.5 kg-cm |
| C. | 1050 kg-cm |
| D. | 625 kg-cm |
| E. | 1250 kg-cm |
| Answer» D. 625 kg-cm | |
| 344. |
In a shaft, the shear stress is not directly proportional to |
| A. | radius of the shaft |
| B. | length of the shaft |
| C. | Increasing the diameter of threaded portion |
| D. | modulus of rigidity |
| E. | angle of twist. |
| Answer» B. length of the shaft | |
| 345. |
In which component a ball or roller bearing cannot be used? |
| A. | Water circulating pump |
| B. | Wheel bearing in automobiles |
| C. | Small end of connecting rod |
| D. | Carankshaft main bearings |
| E. | Big end of connecting rod |
| Answer» E. Big end of connecting rod | |
| 346. |
Muntz metal contains |
| A. | Copper-aluminium |
| B. | Copper-tin |
| C. | Copper-chromium |
| D. | Copper-nickel |
| E. | Copper-zinc |
| Answer» E. Copper-zinc | |
| 347. |
The deep bins are the containers in which the plane of rupture intersects |
| A. | the top surface of material stored |
| B. | Increasing the diameter of threaded portion |
| C. | the opposite surface (wall) near the bottom |
| D. | the bottom survace of material stored |
| E. | the opposite face (wall) near the top |
| Answer» E. the opposite face (wall) near the top | |
| 348. |
For design purpose a spur gear tooth is considered |
| A. | As a cantilever |
| B. | As vital component in analysis |
| C. | As a rough surfacerubbing with another rough surface |
| D. | Proped beam |
| E. | None of the above |
| Answer» A. As a cantilever | |
| 349. |
A 20 HP 1500 r.p.m. induction motor will take current of nearly |
| A. | 20-30 Amp |
| B. | 5 Amp |
| C. | 1 Amp |
| D. | 10-15 Amp |
| E. | 15-20 Amp |
| Answer» A. 20-30 Amp | |
| 350. |
Gears for wrist watches are generally manufactured by |
| A. | Pitcl, angle |
| B. | Helix angle |
| C. | Axial pitch angle |
| D. | Lead angle |
| E. | Pressure angle |
| Answer» B. Helix angle | |
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