McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 451. |
In elevated circular steel tanks, hemispherical bottoms are preferred because |
| A. | large capacity |
| B. | better appearance |
| C. | riveted connection between the side and bottom plates are easy |
| D. | All of the above |
| E. | Increasing the diameter of threaded portion |
| Answer» D. All of the above | |
| 452. |
Stretching on a belt can be controlled by |
| A. | decreasing belt length |
| B. | decreasing stress in the belt |
| C. | decreasing belt velocity |
| D. | none of the above |
| E. | Cast steel |
| Answer» B. decreasing stress in the belt | |
| 453. |
The number of plastic hinges necessary to convert a framed structure into a mechanism is (r is degree of redundancy of the structure) |
| A. | r - 1 |
| B. | r + 1 |
| C. | 2r + 1 |
| D. | 2r - 1 |
| E. | Increasing the diameter of threaded portion |
| Answer» B. r + 1 | |
| 454. |
The surface hardness that can be obtained by nitriding is generally in the range |
| A. | 800 - 1000 VPN |
| B. | Below 400 VPN |
| C. | 1000 - 1100 VPN |
| D. | 600 - 800 VPN |
| E. | 400 - 600 VPN |
| Answer» C. 1000 - 1100 VPN | |
| 455. |
A circulating water pump of a condenser is of the centrifugal type and directly connected to a three phase induction motor running at 900 rpm. The pump delivers 30,000 litres per minute against the dynamic head of 10 m. The horse power of the motor required to drive the pump would be |
| A. | 40-50 HP |
| B. | 50-60 HP |
| C. | 60-70 HP |
| D. | 30-40 HP |
| E. | 20-30 HP |
| Answer» C. 60-70 HP | |
| 456. |
Which process will improve the fatigue life of a part? |
| A. | Electrocoating |
| B. | Chemical coating |
| C. | Shot peening |
| D. | Polishing |
| E. | Electroplating |
| Answer» C. Shot peening | |
| 457. |
Addendum is |
| A. | The depth of a gear tooth |
| B. | Half the depth of a gear tooth |
| C. | Depth of tooth space below the pitch circle |
| D. | Height by which tooth projects beyond the pitch circle |
| E. | None of the above |
| Answer» D. Height by which tooth projects beyond the pitch circle | |
| 458. |
Commonly adopted material for rivets in |
| A. | Mild steel |
| B. | Cast iron |
| C. | Wrought iron |
| D. | Malleable iron |
| E. | None of the above |
| Answer» A. Mild steel | |
| 459. |
When power is to be transmitted by two pulleys of different materials, then design will be based on pulley |
| A. | Having smaller diameter |
| B. | Having larger diameter |
| C. | Having ( |
| D. | Having ( |
| E. | Any of the above |
| Answer» D. Having ( | |
| 460. |
Two springs having stiffness are in series. The equivalent stiffness would be |
| A. | K |
| B. | K/4 |
| C. | 4 K |
| D. | 2 K |
| E. | K/2 |
| Answer» E. K/2 | |
| 461. |
In case of ductile materials the theory of elastic failure generally applied is |
| A. | Maximum shear stress theory |
| B. | Maximum principal stress theory |
| C. | Distortion energy theory |
| D. | Maximum strain theory |
| E. | Maximum total strain energy theory |
| Answer» A. Maximum shear stress theory | |
| 462. |
Washer are generally specified by |
| A. | Thickness |
| B. | Outer diameter |
| C. | Central hole diameter |
| D. | Mean diameter |
| E. | (A) and (C) above |
| Answer» C. Central hole diameter | |
| 463. |
A coupling used to connect two perfectly aligned shafts is |
| A. | bush pin coupling |
| B. | Oldham coupling |
| C. | rigid tlange coupling |
| D. | none of the above |
| E. | Cast steel |
| Answer» C. rigid tlange coupling | |
| 464. |
Full stress reversal normally does not occur in bolted connections due to |
| A. | surface hardness |
| B. | ridges and valleys in the form of threads |
| C. | varying cross-section |
| D. | Increasing the diameter of threaded portion |
| E. | pre-loading during tightening |
| Answer» E. pre-loading during tightening | |
| 465. |
The frictional horse power loss in a bearing having 25 mm diameter subjected to a load of 200 kg rotating at 600 rpm will be of the order of |
| A. | 2HP |
| B. | 0.05 HP |
| C. | 1 HP |
| D. | 0.5 HP |
| E. | 10 HP |
| Answer» B. 0.05 HP | |
| 466. |
If the Brinell hardness number of a sample of steel is 200, the ultimate tensile strength will be approximately |
| A. | Cannot be determined |
| B. | 70 kgf/mm2 |
| C. | 200 kgf/mm2 |
| D. | 100 kgf/mm2 |
| E. | Silver |
| Answer» B. 70 kgf/mm2 | |
| 467. |
Which of the following key is used for light work? |
| A. | Round key |
| B. | Increasing the diameter of threaded portion |
| C. | Tangent key |
| D. | Sunk key |
| E. | Saddle key |
| Answer» E. Saddle key | |
| 468. |
For butt welding of two plates, each of which is 300 cm thick, the best process would be |
| A. | Submerged are welding |
| B. | MIG welding |
| C. | TIG welding |
| D. | Gas welding |
| E. | Electro slag welding |
| Answer» E. Electro slag welding | |
| 469. |
The number of possible independency mechanisms, n is determined from the following relationship |
| A. | n = 2 N - r |
| B. | n = 2 N + r |
| C. | Increasing the diameter of threaded portion |
| D. | n = N + r |
| E. | n = N - r |
| Answer» E. n = N - r | |
| 470. |
In as steam engine, piston rod is connected to the cross head by |
| A. | flange coupling |
| B. | universal coupling |
| C. | cotter joint |
| D. | knuckle joint |
| E. | Increasing the diameter of threaded portion |
| Answer» C. cotter joint | |
| 471. |
For water tight joints such as in boiler the rivets are driven |
| A. | Increasing the diameter of threaded portion |
| C. | either in hot or cold condition |
| D. | in cold condition only |
| E. | in hot condition only |
| Answer» E. in hot condition only | |
| 472. |
Iniversal coupling is |
| A. | Used for collinear shafts |
| B. | Rigid coupling |
| C. | Type of flange coupling |
| D. | Used for non-collinear shafts |
| E. | None of the above |
| Answer» D. Used for non-collinear shafts | |
| 473. |
Ball bearing type screws are generally used |
| A. | In bench vices |
| B. | In screw jacks |
| C. | In earthmoving machinery |
| D. | Steering mechanisms |
| E. | None of the above |
| Answer» D. Steering mechanisms | |
| 474. |
The maximum size of the fillet weld that can be made in single pass is |
| A. | 12 mm |
| B. | 3 mm |
| C. | Increasing the diameter of threaded portion |
| D. | 8 mm |
| E. | 6 mm |
| Answer» D. 8 mm | |
| 475. |
Friction losses in spur gears may be of the order of |
| A. | 15% to 20% |
| B. | 20% to 30% |
| C. | 5% to 10% |
| D. | 10% to 15% |
| E. | Less than 5% |
| Answer» E. Less than 5% | |
| 476. |
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» A. Steam turbines | |
| 477. |
Flexible shafts are made of |
| A. | thin mild steel rod |
| B. | Increasing the diameter of threaded portion |
| D. | hollow mild steel rod |
| E. | wavy steel wires |
| Answer» E. wavy steel wires | |
| 478. |
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» B. Compound gear train | |
| 479. |
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» A. Heated before inserting in position | |
| 480. |
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» C. dc series motor | |
| 481. |
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» A. shear and crushing | |
| 482. |
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» A. In the direction of screwing in | |
| 483. |
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» C. Shock loading | |
| 484. |
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» D. V-belt drive | |
| 485. |
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» C. simultaneously on both the pulleys | |
| 486. |
Poisson's ratio for steel is |
| A. | 0.33 |
| B. | 0.27 |
| C. | 0.1 |
| D. | 1 |
| E. | None of the above |
| Answer» B. 0.27 | |
| 487. |
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» B. Rankines theory | |
| 488. |
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» C. 5 mm | |
| 489. |
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» E. Biaxial stress | |
| 490. |
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» C. web only | |
| 491. |
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» C. The first and last gear are on the same shaft | |
| 492. |
In an extra humid atmosphere which one of the following motor would you select? |
| A. | Semi-protected |
| B. | Drip proof |
| C. | Totally enclosed fan cooled |
| D. | Open type |
| E. | Fan cooled |
| Answer» C. Totally enclosed fan cooled | |
| 493. |
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» D. Antimony bearing lead or tia alloy | |
| 494. |
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» A. thin film lubrication | |
| 495. |
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» E. elastic analysis of structures | |
| 496. |
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» D. 40 Cr 40 | |
| 497. |
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» A. Worm | |
| 498. |
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» A. (Se) | |
| 499. |
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» D. Hypoid gears | |
| 500. |
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» B. M 16 x 1.5 | |
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