MCQOPTIONS
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MCQOPTIONS
This section includes 509 Mcqs, each offering curated multiple-choice questions to sharpen your Machine Design knowledge and support exam preparation. Choose a topic below to get started.
| 251. |
Shear stress theory is applicable to |
| A. | Brittle materials |
| B. | Ductile materials |
| C. | Plastic materials |
| D. | Visco-elastic materials |
| E. | Elastic materials |
| Answer» C. Plastic materials | |
| 252. |
In case the diameter of a shaft is doubled, its torque transmitting capacity will increase by |
| A. | Big ends of connecting rods for I.C. engines |
| B. | 2 times |
| C. | 8 times |
| D. | 16 times |
| E. | 4 times |
| Answer» D. 16 times | |
| 253. |
A bench vice is provided with |
| A. | Vee threads |
| B. | BSW threads |
| C. | Buttress threads |
| D. | Acme threads |
| E. | None of the above |
| Answer» E. None of the above | |
| 254. |
Wringing fit is common in |
| A. | Automobile wheel rims |
| B. | Ball bearings |
| C. | Roller bearing |
| D. | Piston pins |
| E. | Slip gauges |
| Answer» D. Piston pins | |
| 255. |
An involute gear should have minimum of |
| A. | 6 teeth |
| B. | 20 teeth |
| C. | 4 teeth |
| D. | 8 teeth |
| E. | 12 teeth |
| Answer» E. 12 teeth | |
| 256. |
The number of degrees of accuracy in case of gears is |
| A. | Ten |
| B. | Twelve |
| C. | Hundred |
| D. | Six |
| E. | One thousand |
| Answer» C. Hundred | |
| 257. |
Setscrews are |
| A. | Used on sheet metals only |
| B. | Used to prevent relative motion between parts |
| C. | Small screws |
| D. | Self hreading |
| E. | Headless screws |
| Answer» C. Small screws | |
| 258. |
As per Indian Boilers Regulations the type of joint preferred for circumferential joints is |
| A. | Welded joint with cover plate |
| B. | Any of above |
| C. | Welded joint |
| D. | Reveted butt joint |
| E. | Riveted lap joint |
| Answer» F. | |
| 259. |
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» E. 55.50% | |
| 260. |
The coefficient of friction will be least in case of |
| A. | Leather on metal |
| B. | Asbestos on metal in oil |
| C. | Metal on metal |
| D. | Wood on metal |
| E. | Sintered metal on cast iron in oil |
| Answer» F. | |
| 261. |
Which threads have better fatigue characteristics? |
| A. | Threads cut by taps |
| B. | Threads cut by rolling |
| C. | Increasing the diameter of threaded portion |
| D. | Threads cut on lathe |
| Answer» D. Threads cut on lathe | |
| 262. |
For which of the following gears noise level is low |
| A. | cast iron gears |
| B. | alloys steel gears |
| C. | non metallic gears |
| D. | none of the above |
| E. | Cast steel |
| Answer» D. none of the above | |
| 263. |
If the threads on a bolt are right hand the threads on nut will be |
| A. | Right hand with less clearance |
| B. | Right hand withmore clerance |
| C. | Left hand with more clearance |
| D. | Right hand |
| E. | Left hand |
| Answer» E. Left hand | |
| 264. |
A pair of straight tooth bevel gears connects a pair of shafts at 90?. The velocity ratio is 3:1. The cone ptich angle of the pinion will be |
| A. | 22.5? |
| B. | 71.6? |
| C. | 30? |
| D. | 18.4? |
| E. | 60? |
| Answer» E. 60? | |
| 265. |
The pitch of 24 mm diameter metric threads would be |
| A. | 6 mm |
| B. | 1 mm |
| C. | 2 mm |
| D. | 5 mm |
| E. | 3 mm |
| Answer» F. | |
| 266. |
Which type of gears are preferred for low noise applications? |
| A. | Spur gears with cycloidal profile |
| B. | Spur gears with involute profile |
| C. | Bevel gears |
| D. | Helical gears |
| E. | Any of the above |
| Answer» E. Any of the above | |
| 267. |
What type of gears are provided in a switch gear? |
| A. | Spur gears |
| B. | Helical gear |
| C. | Bevel gears |
| D. | Herringbone gears |
| E. | None of the above |
| Answer» F. | |
| 268. |
For very heavy loads which of the following gear tooth profile will be preferred? |
| A. | 20? stub involute profile |
| B. | 14 |
| C. | 14 |
| D. | 14 |
| E. | 20? full depth involute profile |
| Answer» E. 20? full depth involute profile | |
| 269. |
Gears preferred for minimum axial thrust are |
| A. | Helical gears |
| B. | Worm gears |
| C. | Hypoid gears |
| D. | Herring bone gears |
| E. | Any of the above |
| Answer» E. Any of the above | |
| 270. |
The thickness of a gear tooth is measured |
| A. | Along the pitch circle |
| B. | Along the root circle |
| C. | Along the outer circle |
| D. | Average of the profile |
| E. | None of the above |
| Answer» B. Along the root circle | |
| 271. |
Abrasion wear of gear tooth occurs due to |
| A. | Poor lubrication |
| B. | Fatigue |
| C. | Presence of foreign particles |
| D. | Excessive load |
| E. | Any of the above |
| Answer» D. Excessive load | |
| 272. |
Maximum principal stress theory for the failure of a material at elastic point, is knowns as |
| A. | Von Mises theory |
| B. | Rankines theory |
| C. | Haig's theory |
| D. | Guest's or Tresca's theory |
| E. | Increasing the diameter of threaded portion |
| Answer» C. Haig's theory | |
| 273. |
The gears used for non-intersecting perpendicular shafts are |
| A. | Herringbone gears |
| B. | Helical gears |
| C. | Spur gears |
| D. | Hypoid gears |
| E. | Double helical gears |
| Answer» E. Double helical gears | |
| 274. |
The holding power of sunk key is due to the resistance it differs in |
| A. | shear and crushing |
| B. | Cast steel |
| C. | crushing only |
| D. | tension only |
| E. | shear only |
| Answer» B. Cast steel | |
| 275. |
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» B. As vital component in analysis | |
| 276. |
Fine thread with 16 mm nominal diameter and 1.5 mm pitch is designed as |
| A. | M 1.5 x 16 |
| B. | M 16 x 1.5 |
| C. | M 16 |
| D. | none of the above |
| E. | Cast steel |
| Answer» C. M 16 | |
| 277. |
The minor-diameter cross-section of the portion of the screw between the nut and the thrust bearing is subjected to |
| A. | Tension |
| B. | Compression |
| C. | Shear |
| D. | Torque |
| E. | Biaxial stress |
| Answer» F. | |
| 278. |
Which of the following equipment operates at higher speeds as compared to the remaining? |
| A. | Steam turbines |
| B. | Automobiles |
| C. | Diesel engines |
| D. | Machine tools |
| E. | Fram machinery |
| Answer» B. Automobiles | |
| 279. |
An automobile gear box has |
| A. | Simple gear train |
| B. | Compound gear train |
| C. | Epicycle gear train |
| D. | Compound epicyclic gear train |
| E. | None of the above |
| Answer» C. Epicycle gear train | |
| 280. |
Which steel will have maximum percentage of carbon? |
| A. | 20 Cr 18 Ni 2 |
| B. | 15 Cr 65 |
| C. | C 14 |
| D. | 40 Cr 40 |
| E. | C 15 |
| Answer» E. C 15 | |
| 281. |
A Babbitt is |
| A. | A eutcctic of iron and iron phosphide |
| B. | A gadget for measuring volume |
| C. | A measure of magnetic induction produced in a material |
| D. | Antimony bearing lead or tia alloy |
| E. | None of the above |
| Answer» E. None of the above | |
| 282. |
Resilience of material should be considered when it is subjected to |
| A. | Fluctuating load |
| B. | Wear and tear |
| C. | Shock loading |
| D. | Any of the above |
| E. | None of the above |
| Answer» D. Any of the above | |
| 283. |
A reverted gear train is one in which |
| A. | The direction of rotation of first and last gear is the same |
| B. | The direction of rotation of first and last gear is opposite |
| C. | The first and last gear are on the same shaft |
| D. | The first and the last gear are essentially on separate but parallel shafts |
| E. | None of the above |
| Answer» D. The first and the last gear are essentially on separate but parallel shafts | |
| 284. |
While designing a warm and a worm wheel the sign should be governed by |
| A. | Worm |
| B. | Worm wheel |
| C. | Any one of the two |
| D. | Standards designs should be followed |
| E. | None of the above |
| Answer» B. Worm wheel | |
| 285. |
Which of the following drive cannot be used for driving cam shaft of a four stroke intemal cambustion engine? |
| A. | Spur gear drive |
| B. | Helical gear drive |
| C. | Chain drive |
| D. | V-belt drive |
| E. | None of the above |
| Answer» E. None of the above | |
| 286. |
The maximum thickness of the plates used in pressed steel tanks is |
| A. | Increasing the diameter of threaded portion |
| B. | 3 mm |
| C. | 5 mm |
| D. | 6 mm |
| E. | 4 mm |
| Answer» D. 6 mm | |
| 287. |
In case of rolled steel beams, the chear force is resisted by |
| A. | Increasing the diameter of threaded portion |
| B. | flanges only |
| C. | web only |
| D. | web and flanges together |
| E. | top flange only |
| Answer» D. web and flanges together | |
| 288. |
Fine scratches assist in librication in |
| A. | thin film lubrication |
| B. | thick film lubrication |
| C. | both (A) and (B) above |
| D. | none of the above |
| E. | Increasing the diameter of threaded portion |
| Answer» B. thick film lubrication | |
| 289. |
Screw parts with a right hand thread must only be stressed |
| A. | In the direction of screwing in |
| B. | In the direction of screwing out |
| C. | In the direction normal to the screw axis |
| D. | In the shear plane |
| E. | In the plane of principal axis |
| Answer» B. In the direction of screwing out | |
| 290. |
In an open belt-pulley drive the bodily slip occurs |
| A. | first at larger pulley |
| B. | first at smaller pulley |
| C. | simultaneously on both the pulleys |
| D. | none of the above |
| E. | Cast steel |
| Answer» D. none of the above | |
| 291. |
The ultimate strength design of steel structures makes use of |
| A. | elastic and plastic analysis of structures |
| B. | Increasing the diameter of threaded portion |
| C. | plastic analysis of structures |
| D. | ultimate analysis |
| E. | elastic analysis of structures |
| Answer» F. | |
| 292. |
A starter in automobile is generally |
| A. | Single phase a.c.motor |
| B. | dc shunt motor |
| C. | dc series motor |
| D. | dc compound motor |
| E. | None of the above |
| Answer» D. dc compound motor | |
| 293. |
Rivets are |
| A. | Heated before inserting in position |
| B. | Heated after inserting in position |
| C. | Not heated at all |
| D. | Cold forged |
| E. | None of the above |
| Answer» B. Heated after inserting in position | |
| 294. |
Flexible shafts are made of |
| A. | thin mild steel rod |
| B. | Increasing the diameter of threaded portion |
| C. | hollow mild steel rod |
| D. | wavy steel wires |
| Answer» F. | |
| 295. |
Poisson's ratio for steel is |
| A. | 0.33 |
| B. | 0.27 |
| C. | 0.1 |
| D. | 1 |
| E. | None of the above |
| Answer» C. 0.1 | |
| 296. |
If the stress at elastic limit is Se, then the modulus of resistance is proportional to |
| A. | (Se) |
| B. | (Se)1/2 |
| C. | (Se)2 |
| D. | Se |
| E. | (Se)2/2 |
| Answer» B. (Se)1/2 | |
| 297. |
If screw threads are to be used in a situation involving high stresses in one direction only, the types of threads suitable for this would be |
| A. | BA |
| B. | BSW |
| C. | Buttress |
| D. | Acme |
| E. | Square |
| Answer» D. Acme | |
| 298. |
Stub tooth is |
| A. | Longer than standard tooth depth |
| B. | Non-standard tooth |
| C. | Shorter than standard tooth depth |
| D. | Equivalent rack tooth |
| E. | Standard gear tooth |
| Answer» D. Equivalent rack tooth | |
| 299. |
Fatigue is mostly initiated at |
| A. | core |
| B. | centre |
| C. | Increasing the diameter of threaded portion |
| D. | surface |
| E. | core |
| Answer» E. core | |
| 300. |
In a horizontal flat belt drive for power transmission it is customary to use |
| A. | bottom side of the belt as slack side |
| B. | top side of the belt as slack side |
| C. | crossed-belting |
| D. | none of the above |
| E. | Cast steel |
| Answer» C. crossed-belting | |