MCQOPTIONS
Saved Bookmarks
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.
| 401. |
In case of a knuckle joint the pin is likely to fail in |
| A. | Tension |
| B. | Crushing |
| C. | Double shear |
| D. | Compression |
| E. | Shear |
| Answer» D. Compression | |
| 402. |
Extrafine threaded connections are generally recommended for |
| A. | Increasing the diameter of threaded portion |
| B. | Rolled sections |
| C. | hardened objects |
| D. | thin walled assemblies |
| E. | Tapped hole in castings |
| Answer» E. Tapped hole in castings | |
| 403. |
The satisfactory method of reclaiming worn out and under sized part subject to fatigue loads is |
| A. | Repainting |
| B. | Polishing |
| C. | Electroplating |
| D. | Recasting |
| E. | None of the above |
| Answer» D. Recasting | |
| 404. |
Lubricant is not required in |
| A. | Increasing the diameter of threaded portion |
| B. | Electromagnetic bearing |
| C. | Hydrostatic bearings |
| D. | Gas bearings |
| E. | Foil bearing |
| Answer» C. Hydrostatic bearings | |
| 405. |
Shot peening leaves the material surface in |
| A. | residual tensile stress |
| B. | residual shear stress |
| C. | residual compressive stress |
| D. | All of the above |
| E. | Increasing the diameter of threaded portion |
| Answer» D. All of the above | |
| 406. |
A material is generally classified as brittle if the percentage elongation (in a gauge length of 50 mm) is less than |
| A. | Chrome steel |
| B. | 1% |
| C. | 2% |
| D. | 5% |
| E. | 15% |
| Answer» E. 15% | |
| 407. |
A steel specified as St 50 will have a tensile strength of approximately |
| A. | 50 tonnes/m2 |
| B. | 50 kg/mm2 |
| C. | 50 kg/cm2 |
| D. | 50 tonnes/mm2 |
| E. | None of the above |
| Answer» C. 50 kg/cm2 | |
| 408. |
The holes in plates for reveting are usually made by |
| A. | Arc cutting |
| B. | Oxyacetylene flame |
| C. | Punching |
| D. | Drilling |
| E. | Any of the above |
| Answer» E. Any of the above | |
| 409. |
Spigot and socket joints are used on pipes |
| A. | Which are buried underground |
| B. | Carrying air at pressure above atmospheric pressure |
| C. | Carrying steam under high pressure |
| D. | Carrying high pressure fluids under high pressure |
| E. | Carrying air at pressure below atmospheric pressure |
| Answer» B. Carrying air at pressure above atmospheric pressure | |
| 410. |
A flange coupling is |
| A. | Used for non-collinear shafts |
| B. | Used for collinear shafts |
| C. | Flexible |
| D. | Used only on small shafts rotating at slow speeds |
| E. | None of the above |
| Answer» C. Flexible | |
| 411. |
A stud is |
| A. | Screw with cylindrical head |
| B. | Headless scew |
| C. | Screw with circular heads |
| D. | Oval heads screw |
| E. | Screw with long threads |
| Answer» C. Screw with circular heads | |
| 412. |
Dead weight type safety valve is not used on locomotives because |
| A. | It is costly |
| B. | It is susceptible to vibratory forces |
| C. | It is not reliable |
| D. | It is bulky |
| E. | It gives bad apparatus |
| Answer» C. It is not reliable | |
| 413. |
The weakest plane in a fillet weld is |
| A. | the throat |
| B. | smaller of the sides |
| C. | side normal to the force |
| D. | side parallel to the force |
| E. | Increasing the diameter of threaded portion |
| Answer» B. smaller of the sides | |
| 414. |
In gear design, addendum is equal to |
| A. | Cast steel |
| B. | Twice of module |
| C. | One and a half times module |
| D. | Module |
| E. | Half of module |
| Answer» E. Half of module | |
| 415. |
Low pressure angle on gears results in |
| A. | Weaker teeth |
| B. | stronger teeth |
| C. | abrasive wear |
| D. | none of the above |
| E. | Cast steel |
| Answer» B. stronger teeth | |
| 416. |
Non-metallic gears have |
| A. | Low noise at higher speeds and low load carrying capacity |
| B. | High noise at higher speeds and high load carrying capacity |
| C. | Low noise at higher speeds and high load carrying capacity |
| D. | Cannot be operated at higher speed. |
| E. | All of the above |
| Answer» B. High noise at higher speeds and high load carrying capacity | |
| 417. |
The efficiency of a screw track is maximum when its helix angle '?' is equal to |
| A. | 45 - ? |
| B. | 45 - ?/2 |
| C. | Increasing the diameter of threaded portion |
| D. | 45 + ?/2 |
| E. | 45? |
| Answer» C. Increasing the diameter of threaded portion | |
| 418. |
Which of the following is not the advantage of V-belts over flat belts? |
| A. | Less shock load absorption |
| B. | Less axial space requirement |
| C. | Increasing the diameter of threaded portion |
| D. | Less slippage |
| E. | Less noisy |
| Answer» C. Increasing the diameter of threaded portion | |
| 419. |
The following property is the most important for normal used for gas turbine blades |
| A. | Increasing the diameter of threaded portion |
| B. | Resistance to bending |
| C. | Creep |
| D. | Fatigue |
| E. | Resistance to shear |
| Answer» D. Fatigue | |
| 420. |
Which of the following is a positive clutch? |
| A. | Increasing the diameter of threaded portion |
| B. | Band cluch |
| C. | Jaw clutch |
| D. | Disc clutch |
| Answer» D. Disc clutch | |
| 421. |
When a section of a beam is plastified due to given system of loading then |
| A. | the length of beam over which the moment is geater than or equal to the yield moment is plastified |
| B. | only one section of beam is plastified |
| C. | the whole length of beam is plastified |
| D. | Increasing the diameter of threaded portion |
| E. | the length of beam over which the moment is less than the yield moment is plastified |
| Answer» B. only one section of beam is plastified | |
| 422. |
The pitch circle of a cam is |
| A. | The smallest circle drawn to the pitch curve |
| B. | Thesmallest circle drawn to the cam profile from the centre of rotation of a radial cam |
| C. | The circle fitting in the cam profile |
| D. | The circle with centre as the centre of cam axis and radius such that it passes through the point |
| E. | None of the above |
| Answer» E. None of the above | |
| 423. |
In case of Vee belt |
| A. | The belt should not touch the bottom of groove in the pulley |
| B. | The belt should touch the bottom of groove in the fulley |
| C. | The efficiency of transmission is less |
| D. | Grooves in the pulley are generally wider than the belt |
| E. | Tension in belt remains constant throughout |
| Answer» B. The belt should touch the bottom of groove in the fulley | |
| 424. |
Cold working of materials |
| A. | Increases the fatigue strength |
| B. | Reduces the fatigue strength |
| C. | Does not change fatigue strength |
| D. | Has no effect on fatigue trength |
| E. | None of the above |
| Answer» B. Reduces the fatigue strength | |
| 425. |
An induction motor stator is cooled by |
| A. | Air |
| B. | Water |
| C. | Hydrogen |
| D. | Air and water |
| E. | None of the above |
| Answer» B. Water | |
| 426. |
The casing of a water pump is generally |
| A. | Made of soft material |
| B. | Made of hard material |
| C. | Made of chilled cast iron for water resistance |
| D. | Made of non-ferrous materials |
| E. | None of the above |
| Answer» D. Made of non-ferrous materials | |
| 427. |
The differential equation 10x + 200 x + 810x = 0 describes one degree of freedom system. The system is |
| A. | Oscillatory |
| B. | Having critical damping |
| C. | Having more than critical damping |
| D. | Having less than critical damping |
| E. | None of the above |
| Answer» D. Having less than critical damping | |
| 428. |
Normally a spring operates within |
| A. | Visco-elastic limits |
| B. | Plastic limits |
| C. | Para-elastic limits |
| D. | Elasto-plastic limits |
| E. | Elastic limits |
| Answer» F. | |
| 429. |
What should be the thickness of a cast iron pipe 45 cm diameter if it is required to sustain 6 kg/sq cm inside pressure ? The maximum stress in the pipe material being limited to 140 kg/cm2 |
| A. | 12 mm |
| B. | 10 mm |
| C. | 7.5 mm |
| D. | 5 mm |
| E. | 15 mm |
| Answer» C. 7.5 mm | |
| 430. |
Bush bearings are |
| A. | Phosphor bronze |
| B. | Aluminium brass |
| C. | Mild steel |
| D. | White metal alloys |
| E. | None of the above |
| Answer» E. None of the above | |
| 431. |
The locomotive wheel tires are fitted as |
| A. | Wringing fit |
| B. | Loose fit |
| C. | Free fit |
| D. | Snug fit |
| E. | Shrink fit |
| Answer» F. | |
| 432. |
Small steel balls are manufactured by |
| A. | Cold heading |
| B. | Casting |
| C. | Rolling |
| D. | Turning in lathe |
| E. | Spinning |
| Answer» B. Casting | |
| 433. |
The curve traced by a point on a line as the line rolls on another curve is known as |
| A. | Cycloid |
| B. | Involute |
| C. | Hypocycloid |
| D. | Hyperbola |
| E. | Epicycloid |
| Answer» C. Hypocycloid | |
| 434. |
If during operation of a boiler one of the riveted joints is found leaking |
| A. | The boiler is stopped immediately |
| B. | All the riveted joints are reopened and gain riveted |
| C. | Depending upon the zone of boiler in which the joint leaks, decision is taken |
| D. | The joint is repaired if in low pressure zones otherwise boiler sent for repairs |
| E. | None of the above |
| Answer» E. None of the above | |
| 435. |
Bolts in structures are often tightened |
| A. | upto 90% of yield point |
| B. | below yield point |
| C. | Increasing the diameter of threaded portion |
| D. | upto breaking point |
| E. | upto or beyond yield point |
| Answer» F. | |
| 436. |
In case of spur gears the higher pressure angle results in |
| A. | Wider base and stronger teeth |
| B. | Weaker teeth |
| C. | Narrow base and weaker teeth |
| D. | Non-uniform motion transmission |
| E. | Begger size of gear |
| Answer» B. Weaker teeth | |
| 437. |
In case of rivets, the countersunk heads are used to |
| A. | connect unequal sections |
| B. | Increasing the diameter of threaded portion |
| C. | provide a fluish surface |
| D. | connect structural members |
| E. | connect different materials |
| Answer» D. connect structural members | |
| 438. |
Which of the following key permits axial relative motion between the shaft and the hub? |
| A. | Wood ruff key |
| B. | Square key |
| C. | Increasing the diameter of threaded portion |
| D. | Gib headed key |
| E. | Feather key |
| Answer» F. | |
| 439. |
In order to avoid interference for 20 pressure and teeth, minimum number of teeth should be |
| A. | 8 |
| B. | More than 18 |
| C. | 12 |
| D. | More than 24 |
| E. | 16 |
| Answer» C. 12 | |
| 440. |
The bursting pressure of 12 mm ID, 14 mm OD seamless cartridge brass tubing having ultimate whear stress of 225 Mpa, will be nearly |
| A. | 40 Kpa |
| B. | Increasing the diameter of threaded portion |
| C. | 20 Kpa |
| D. | 10 Kpa |
| E. | 30 Kpa |
| Answer» B. Increasing the diameter of threaded portion | |
| 441. |
Splined shafts are commonly used in |
| A. | Machine tools |
| B. | Bicycles |
| C. | Aircraft |
| D. | Automobiles |
| E. | None of the above |
| Answer» E. None of the above | |
| 442. |
Machines screws are |
| A. | Generally provided with head longer than that of a normal screw |
| B. | Headless |
| C. | Provided with slotted head and used with a nut |
| D. | Screws with button-head |
| E. | Screws with rounded head |
| Answer» B. Headless | |
| 443. |
Acoustical materials |
| A. | Create sound |
| B. | Create and reflect sound |
| C. | Absorb sound |
| D. | Reflect sound |
| E. | Absorb and reflect sound |
| Answer» D. Reflect sound | |
| 444. |
Smooth bearing surface is an essential pre-requisite in case of |
| A. | thin-film lubrication |
| B. | thick film lubrication |
| C. | both film (A) and (B) above |
| D. | none of the above |
| E. | Increasing the diameter of threaded portion |
| Answer» C. both film (A) and (B) above | |
| 445. |
The wrist pin of diesel engine is always in |
| A. | Increasing the diameter of threaded portion |
| B. | a tresss free from shear |
| C. | single shear |
| D. | double shear |
| Answer» F. | |
| 446. |
A simple supported steel beam when loaded with a force of 100 kg at A is found to deflect 10 mm at B. What force at B would cause a deflection of 2.5 mm at A |
| A. | 10 kg |
| B. | 50 kg |
| C. | 100 kg |
| D. | 400 kg |
| E. | 25 kg |
| Answer» F. | |
| 447. |
A unknown weight falls through 1 cm on a collar rigidly attached to the lower end of a vartical bar 3 cm long and 6 cm2 in section. If the maximum instantaneous extension is 2 mm the value of stress would be |
| A. | 1333 kg/cm2 |
| B. | 1000 kg/cm2 |
| C. | 667 kg/cm2 |
| D. | 1500 kg/cm2 |
| E. | 500 kg/cm2 |
| Answer» B. 1000 kg/cm2 | |
| 448. |
The function of gear box in an automobile is |
| A. | To provide variable speeds |
| B. | To reduce speed |
| C. | To increase speed |
| D. | To produce torque |
| E. | To increase efficiency |
| Answer» B. To reduce speed | |
| 449. |
Fatigue strength of a surface may be increased by |
| A. | Applying concentrated hydrochloric acid on the surface |
| B. | Applying birine on the surface and then washing with cold water |
| C. | Making surface rough |
| D. | Filling the surface |
| E. | Polishing the surface |
| Answer» F. | |
| 450. |
Which type of loading should be avoided |
| A. | Cleavage loading |
| B. | Shear loading |
| C. | Tensile loading |
| D. | none of the above |
| E. | Increasing the diameter of threaded portion |
| Answer» B. Shear loading | |