McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 351. |
For a parallel load on a fillet weld of equal leg the plane of maximum shear occurs |
| A. | Almost vertically |
| B. | Almost horizontallly |
| C. | At 45? to the horizontal |
| D. | At 30? to the vertical |
| E. | At 30? to the horizontal |
| Answer» C. At 45? to the horizontal | |
| 352. |
Which of the following types of gears are free from interference? |
| A. | Cycloidal |
| B. | Epicycloidal |
| C. | Involute |
| D. | Stub |
| E. | Hypocycloidal |
| Answer» A. Cycloidal | |
| 353. |
A section is subjected to reversal of stresses. Choice exists for selecting any of the following section. Which one should be selected? |
| A. | T-section |
| B. | Unequal angle iron |
| C. | Channel section |
| D. | Hollow pipe |
| E. | Equal angle iron |
| Answer» D. Hollow pipe | |
| 354. |
For the plastic analysis, the criterion for the analysis of a structure is based upon |
| A. | yield load |
| B. | Increasing the diameter of threaded portion |
| C. | ultimate load |
| D. | working load |
| E. | breaking load |
| Answer» C. ultimate load | |
| 355. |
Two plates are joined by a parallel fillet welds. The plates are subjected to a tensile load of 35000 kg. If the allowable shear stress for the weld material be 800 kg the minimum length of 15 mm weld required to resist this load would be |
| A. | 41 cm |
| B. | 20.5 cm |
| C. | 10 cm |
| D. | 61.5 cm |
| E. | 82 cm |
| Answer» A. 41 cm | |
| 356. |
A spherical metal vessel 120 cm diameter is subjected to an internal pressure of 15 kg/sq cm. If the permissible stress is 625 kg/sq cm and the efficiency of the riveted joints is 75%, the required thickness of the plate would be |
| A. | 10 mm |
| B. | 2 mm |
| C. | 5 mm |
| D. | 1 mm |
| E. | 8 mm |
| Answer» A. 10 mm | |
| 357. |
Belt slip may occur due to |
| A. | None of above |
| B. | Any of above |
| C. | Loose belt |
| D. | Heavy load |
| E. | Driving pulley too small |
| Answer» B. Any of above | |
| 358. |
The plastic hinge in a section is caused when |
| A. | all the fibres at a section reach the yield state |
| B. | the material at a section reaches plastic state |
| C. | the extreme fibres at a section reach the yield state |
| D. | none of the above |
| E. | Increasing the diameter of threaded portion |
| Answer» A. all the fibres at a section reach the yield state | |
| 359. |
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» A. Along the pitch circle | |
| 360. |
The life of a ball bearing is usually given in |
| A. | hours of service |
| B. | total rpm |
| C. | either of (A) or (B) above |
| D. | none of the above |
| E. | Increasing the diameter of threaded portion |
| Answer» C. either of (A) or (B) above | |
| 361. |
In bolts the stress in the unthreaded area (the shank) is |
| A. | lower |
| B. | lower higher |
| C. | higher |
| D. | Increasing the diameter of threaded portion |
| E. | higher or lower |
| Answer» A. lower | |
| 362. |
Life of a rolling bearing as listed in a catalogue is usually |
| A. | minimum expected life |
| B. | maximum expected life |
| C. | mean life |
| D. | none of the above |
| E. | Increasing the diameter of threaded portion |
| Answer» A. minimum expected life | |
| 363. |
For the same power transmission, V-belts are |
| A. | wider, thinner |
| B. | thinner, wider |
| C. | Increasing the diameter of threaded portion |
| D. | narrow, thicker |
| E. | thicker, narrow |
| Answer» D. narrow, thicker | |
| 364. |
Which of the following alloying metal for steels acts as a deoxidizing and desulphurising agent? |
| A. | Nickel |
| B. | Increasing the diameter of threaded portion |
| C. | Chromium |
| D. | Tungsten |
| E. | Manganese |
| Answer» D. Tungsten | |
| 365. |
The coefficient of friction in a rolling bearing is of the order of |
| A. | 0.01 |
| B. | 0.1 |
| C. | 0.2 |
| D. | 0.05 |
| E. | 0.001 |
| Answer» E. 0.001 | |
| 366. |
According to Indian Boiler Regulations the essential requirement of any safety valve is that |
| A. | It should be costly |
| B. | It should have good appearance |
| C. | Its area should be sufficient to discharge the steam as quickly as it is generated with rise in pressure not more than 10% of the safety valve blow off pressure |
| D. | It should be located outside the boiler room |
| E. | It should be visible to boiler operator from all positions in the boiler room |
| Answer» C. Its area should be sufficient to discharge the steam as quickly as it is generated with rise in pressure not more than 10% of the safety valve blow off pressure | |
| 367. |
Which of the following material is not suitable for impact loads? |
| A. | Cast iron |
| B. | Chrome steel |
| C. | Mild steel |
| D. | High carbon steel |
| E. | Manganese steel |
| Answer» A. Cast iron | |
| 368. |
The fatigue limit of a material |
| A. | Is greatly decreased by poor surface conditions |
| B. | Is improved if there is rough surface |
| C. | Is independent of surface conditions |
| D. | Surface defects which extend upto core have no influence of fatigue limits |
| E. | None of the above |
| Answer» A. Is greatly decreased by poor surface conditions | |
| 369. |
The material of a flt spiral spring is in a state of |
| A. | pure torsion |
| B. | pure bending |
| C. | torsion and bending |
| D. | none of the above |
| E. | Cast steel |
| Answer» B. pure bending | |
| 370. |
Safety valve used on locomotive boilers is generally of |
| A. | Spring balanced type |
| B. | Lever load type |
| C. | Spring type |
| D. | Indirect dead weight type |
| E. | Dead weight type |
| Answer» C. Spring type | |
| 371. |
The limit design of steel structures makes use of |
| A. | elastic and plastic analysis of structures |
| B. | ultimate analysis |
| C. | Increasing the diameter of threaded portion |
| D. | plastic analysis of structures |
| E. | elastic analysis of structures |
| Answer» D. plastic analysis of structures | |
| 372. |
Gas lubricated bearings are used for |
| A. | very high rpm and high load applications |
| B. | very low rpm and high load applications |
| C. | very low rpm and low load applications |
| D. | Increasing the diameter of threaded portion |
| E. | very high rpm and low load applications |
| Answer» E. very high rpm and low load applications | |
| 373. |
In a ball bearing a ball is subjected to |
| A. | Compressive stress |
| B. | Tensile stress |
| C. | Shear stress |
| D. | Cyclic stress or fatigue |
| E. | None of the above |
| Answer» D. Cyclic stress or fatigue | |
| 374. |
Backlash is |
| A. | Sum of the clearance of two gears |
| B. | Mutual play between two gears |
| C. | The amount by which the width of a tooth space exceeds the thickness of the engaging tooth on pitch circle |
| D. | Any of the above |
| E. | None of the above |
| Answer» C. The amount by which the width of a tooth space exceeds the thickness of the engaging tooth on pitch circle | |
| 375. |
A cantilever beam of square section is subjected to a load W at the free end. If the length of the beam is increased and load reduced to half the deflection at the free end as compared to original deflection would be |
| A. | 4 times |
| B. | 16 times |
| C. | 1/2 times |
| D. | 2 times |
| E. | 8 times |
| Answer» A. 4 times | |
| 376. |
Forced vibrations |
| A. | Are preceded by free vibrations |
| B. | Are followed by free vibrations |
| C. | Have a frequency more than the natural frequency |
| D. | Are independent of natural frequency |
| E. | None of the above |
| Answer» D. Are independent of natural frequency | |
| 377. |
Bearings provided on passenger coaches in railway are |
| A. | Bush bearings |
| B. | Cast iron bearings |
| C. | Ball bearings |
| D. | Roller bearings |
| E. | Any of the above |
| Answer» D. Roller bearings | |
| 378. |
A coarse scres of major diameter 6 mm is designated as |
| A. | 6 M x 6 x 1 |
| B. | M 6 |
| C. | 6 M x 1 |
| D. | 1 x 6 M |
| E. | Coarse M 6 |
| Answer» B. M 6 | |
| 379. |
A reinforced concrete beam is considered as made of |
| A. | Homogeneous material |
| B. | Composite material |
| C. | Clad material |
| D. | Isotropic material |
| E. | Heterogeneous material |
| Answer» E. Heterogeneous material | |
| 380. |
In concrete mixer, the bevel gears for rotating the drum are generally |
| A. | Shaped |
| B. | Forged |
| C. | Hobbed |
| D. | Precisely machined |
| E. | Casted |
| Answer» E. Casted | |
| 381. |
By using large thread angles in lifting machine |
| A. | The load will be sustained in absence of the other |
| B. | The load will be easily lifted |
| C. | The mechanical advantage will be high |
| D. | The mechanical advantage will be low |
| E. | While unloading, little effort will be required |
| Answer» D. The mechanical advantage will be low | |
| 382. |
The holding power of sunk key is due to resistance which it offers in |
| A. | Shear |
| B. | Crushing |
| C. | Shear and crushing |
| D. | Tension |
| E. | (C) and (D) above |
| Answer» C. Shear and crushing | |
| 383. |
Transverse fillet welded joints are designed for |
| A. | shear, tensile |
| B. | tensile, compressive |
| C. | tensile, shear |
| D. | compressive, shear |
| E. | Increasing the diameter of threaded portion |
| Answer» C. tensile, shear | |
| 384. |
The crest diameter of a screw thread is same as |
| A. | Pitch diameter |
| B. | Major diameter |
| C. | Pitch diameter |
| D. | Core diameter |
| E. | Minor diameter |
| Answer» B. Major diameter | |
| 385. |
All the dimensions for a standard system of interchangeable gears can be defined in terms of |
| A. | Module |
| B. | Diametral pitch and circular pitch |
| C. | Pressure angle and pitch |
| D. | No of teeth and pitch circular diameter |
| E. | Addendum and dedendum |
| Answer» C. Pressure angle and pitch | |
| 386. |
Which of the following theory is also known as maximum shear stress theory of the failure of a material at the elastic limit |
| A. | Von Mises theory |
| B. | Guests Tresca theory |
| C. | Rankines theory |
| D. | Increasing the diameter of threaded portion |
| E. | Haig's theory |
| Answer» B. Guests Tresca theory | |
| 387. |
A fillet weld having axis parallel to the direction of the applied load is known as |
| A. | side fillet weld |
| B. | end fillet weld |
| C. | diagonal fillet weld |
| D. | flat fillet weld |
| E. | Increasing the diameter of threaded portion |
| Answer» A. side fillet weld | |
| 388. |
As per Indian Boilers regulations the type of joint preferred for longitudinal joint is |
| A. | Reveted butt joint |
| B. | Any of above |
| C. | Riveted lap joint |
| D. | Welded joint |
| E. | Welded joint with cover plate |
| Answer» A. Reveted butt joint | |
| 389. |
In case of ball bearing |
| A. | Inner race should harder than outer race |
| B. | Outer race should be harder than balls |
| C. | Only cage should be hardened |
| D. | Inner race should be harder than balls |
| E. | Inner race, outer race and balls should be equally hardened |
| Answer» E. Inner race, outer race and balls should be equally hardened | |
| 390. |
The minimum thickness of steel members exposed to weather and accessible for painting is |
| A. | Increasing the diameter of threaded portion |
| B. | 6 mm |
| C. | 12 mm |
| D. | 8 mm |
| E. | 10 mm |
| Answer» B. 6 mm | |
| 391. |
In case of brittle material the theory of elastic failure generally applied is |
| A. | Maximum total strain energy theory |
| B. | Maximum principal stress theory |
| C. | Distortion energy theory |
| D. | Maximum shear stress theory |
| E. | Maximum strain theory |
| Answer» B. Maximum principal stress theory | |
| 392. |
Stone erusher rolls are generally made |
| A. | Cast iron |
| B. | High carbon steel |
| C. | Mild steel |
| D. | Cast steel |
| E. | Grey iron |
| Answer» B. High carbon steel | |
| 393. |
The natural frequency of a shaft in bending is |
| A. | Nearly the same as the critical speed |
| B. | Nearly half the critical speed |
| C. | Exactly the same at which it is running |
| D. | Nearly double of the critical speed |
| E. | Depends on load and other factors |
| Answer» A. Nearly the same as the critical speed | |
| 394. |
Which of the following key transmits power through frictional resistance only |
| A. | Tangent key |
| B. | Saddle key |
| C. | Woodruff key |
| D. | Kennedy key |
| E. | Sunk key |
| Answer» B. Saddle key | |
| 395. |
In the case of a cantilever, irrespective of the type, loading of the maximum bending moment and maximum shear force occur at |
| A. | Free end |
| B. | ?rd of length from fixed end |
| C. | Centre |
| D. | Increasing the diameter of threaded portion |
| E. | Fixed end |
| Answer» E. Fixed end | |
| 396. |
Manganese in steel increases its |
| A. | Hardness |
| B. | Ductility and Malleability |
| C. | Tensile strength |
| D. | Brittleness |
| E. | Increasing the diameter of threaded portion |
| Answer» C. Tensile strength | |
| 397. |
The diameter of a washer is generally |
| A. | Equal to the diameter of bolt |
| B. | Slightly less than the diameter of the bolt |
| C. | Slight more than the diameter of the bolt |
| D. | Of any size that suits the application |
| E. | None of the above |
| Answer» C. Slight more than the diameter of the bolt | |
| 398. |
If a square key and the shaft are to be of the same material and of equal strength, the length of key would be (d = dia. Of shaft) |
| A. | 1.23 d |
| B. | 1.50 d |
| C. | 2 d |
| D. | d |
| E. | 0.75 d |
| Answer» A. 1.23 d | |
| 399. |
The segmental bottom of a circular tank is subjected to |
| A. | hoop tension |
| B. | hoop compression |
| C. | bending moment |
| D. | none of the above |
| E. | Increasing the diameter of threaded portion |
| Answer» B. hoop compression | |
| 400. |
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» E. 3 mm | |
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