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.
| 451. |
The moment-cuvature relation at a plastic hinge is |
| A. | is a constant curvature for all moments |
| B. | a constant moment for different curvatures |
| C. | Increasing the diameter of threaded portion |
| D. | always linear |
| E. | always linear |
| Answer» C. Increasing the diameter of threaded portion | |
| 452. |
Lag bolts are generally used |
| A. | for fastening castings |
| B. | Increasing the diameter of threaded portion |
| C. | in wooden construction |
| D. | for tapping holes |
| E. | in electrical equipment |
| Answer» D. for tapping holes | |
| 453. |
In a bolt the plane of shear |
| A. | Should be across threaded portion of the shank |
| B. | Should never be acress threaded portion of the shank |
| C. | Should be parallel to the axis of bolt |
| D. | Should be normal so the threaded portion of the shank |
| E. | None of the above |
| Answer» C. Should be parallel to the axis of bolt | |
| 454. |
Braking system used on aircraft is |
| A. | Pneumatic |
| B. | Regenerative |
| C. | Plugging |
| D. | Hydraulic |
| E. | Mechanical |
| Answer» E. Mechanical | |
| 455. |
Oldham's coupling is used to cannect two shafts which |
| A. | Are not in exact alignment |
| B. | Have two axes intersecting |
| C. | Have lateral misalignment |
| D. | Have lateral movement during power transmission |
| E. | Changes axes during power transmission |
| Answer» D. Have lateral movement during power transmission | |
| 456. |
A fine series screws of major diameter 8 mm and pitch 1 mm is generally designated as |
| A. | M 8 x 1 |
| B. | 8 x M 1 |
| C. | 8 x 1 M |
| D. | 8 M |
| E. | 8 M 1 |
| Answer» B. 8 x M 1 | |
| 457. |
Web crippling in beams generally occurs at points where |
| A. | concentrated load occurs |
| B. | deflection is maximum |
| C. | Increasing the diameter of threaded portion |
| D. | shear force is maximum |
| E. | bending moment is maximum |
| Answer» B. deflection is maximum | |
| 458. |
The compression members tend to buckle in the direction of |
| A. | Axis of load |
| B. | Perpendicular to the axis of load |
| C. | Minimum cross-section |
| D. | Least radius of gyration |
| E. | None of the above |
| Answer» E. None of the above | |
| 459. |
Laser treatment of components increases fatigue resistance of metals by |
| A. | compressing holes |
| B. | filling vacancies |
| C. | freezing discontinuities |
| D. | none of the above |
| E. | Increasing the diameter of threaded portion |
| Answer» D. none of the above | |
| 460. |
Jaw clutches |
| A. | cause shock loads when engaging |
| B. | get disengaged at high rpm |
| C. | get disengaged in reverse direction |
| D. | are friction clutches which generate heat when enegaged |
| E. | Increasing the diameter of threaded portion |
| Answer» B. get disengaged at high rpm | |
| 461. |
Failure of rolling bearings occurs mainly due to |
| A. | lubrication failure |
| B. | fatigue |
| C. | load and deformation |
| D. | Increasing the diameter of threaded portion |
| E. | plastic deformation |
| Answer» C. load and deformation | |
| 462. |
A V-belt designated as C 120 will have |
| A. | 120 mm as the dia of small pulley |
| B. | 120 cm as the length of belt |
| C. | 120 inch as the length of belt |
| D. | 120 cm as the centre distance between pulleys |
| E. | None of the above |
| Answer» D. 120 cm as the centre distance between pulleys | |
| 463. |
Rinkine-Gordon formula for buckling load is adopted for columns having slenderness ratio between |
| A. | 50 and 100 |
| B. | 30 and 50 |
| C. | 10 and 30 |
| D. | 120 and 200 |
| E. | Increasing the diameter of threaded portion |
| Answer» E. Increasing the diameter of threaded portion | |
| 464. |
Which of the following drive has accurate speed ratio? |
| A. | Flat cross-belt drive |
| B. | Timing belt drive |
| C. | V-belt 'C' section drive |
| D. | V-belt 'B' section drive |
| E. | Increasing the diameter of threaded portion |
| Answer» C. V-belt 'C' section drive | |
| 465. |
Under which condition a material ordinatily said to be ductile undergoes a fracture similar to that of a brittle material |
| A. | Cyclic loading at normal temperature |
| B. | Long time static loading at elevated temperature |
| C. | Impact loading specially at low temperatures |
| D. | All of the above |
| E. | None of the above |
| Answer» E. None of the above | |
| 466. |
The advantage of needle roller bearing over ball bearing is |
| A. | Less friction |
| B. | Less area requirement |
| C. | Smooth operation |
| D. | Large ratio of load capacity to size |
| E. | None of the above |
| Answer» E. None of the above | |
| 467. |
When minimum axial thrust is the criteria, the choice of gears would been |
| A. | Helical gears |
| B. | Hypoid gears |
| C. | Herringbone gears |
| D. | Worm gears |
| E. | None of the above |
| Answer» D. Worm gears | |
| 468. |
A connecting rod in an IC Engine is to be designed against buckling. The end conditions considered are |
| A. | Both the ends fixed |
| B. | Both the ends are free |
| C. | Both the ends are hinged |
| D. | none of the above |
| E. | Cast steel |
| Answer» D. none of the above | |
| 469. |
In a gas turbine rotor a radial stress of 300 kg/sq cm tensile and 500 kg/sq cm tangential stress have been found at a point. The maximum shear stress at this point would be |
| A. | 500 kg/cm2 |
| B. | 250 kg/cm2 |
| C. | 595 kg/cm2 |
| D. | 750 kg/sq-cm |
| E. | 300 kg/cm2 |
| Answer» C. 595 kg/cm2 | |
| 470. |
The bunkers are the containers in which the plan of rupture intersects |
| A. | the opposite face (wall) near the bottom |
| B. | Increasing the diameter of threaded portion |
| C. | the opposite face (wall) near the top |
| D. | the bottom surface of material stored |
| E. | the top surface of material stored |
| Answer» F. | |
| 471. |
A ball bearing cannot be provided for |
| A. | Big ends of connecting rods for I.C. engines |
| B. | Variable load shafts |
| C. | Variable speed shafts |
| D. | Automobile gear shafts |
| E. | Low speed shafts |
| Answer» B. Variable load shafts | |
| 472. |
If during operation a boiler bursts, the matter should be reported to |
| A. | State Government |
| B. | Management |
| C. | Central Government |
| D. | Boiler inspector |
| E. | Police |
| Answer» E. Police | |
| 473. |
The life of ball bearings as listed in catalogue represents |
| A. | 25% survival rate |
| B. | 90% survival rate |
| C. | 50% survival rate |
| D. | 75% survival rate |
| E. | Increasing the diameter of threaded portion |
| Answer» C. 50% survival rate | |
| 474. |
A rack is a gear |
| A. | With infinite diametral pitch |
| B. | With infinite pitch circle diameter |
| C. | With infinite module |
| D. | With infinite number of teeth |
| E. | With infinite circular pitch |
| Answer» E. With infinite circular pitch | |
| 475. |
Maximum efficiency expected in case of single mech supr gears is around |
| A. | 58% |
| B. | 98% |
| C. | 88% |
| D. | 68% |
| E. | 78% |
| Answer» C. 88% | |
| 476. |
According to IS 800, the lacing bars should resist a transverse shear equal to |
| A. | 7.50% |
| B. | 2.50% |
| C. | Increasing the diameter of threaded portion |
| D. | 17.50% |
| E. | 12.50% |
| Answer» C. Increasing the diameter of threaded portion | |
| 477. |
Expansion joints are provided on pipes carrying |
| A. | Viscous fluids |
| B. | Water |
| C. | Air at pressures below atmospheric pressure |
| D. | Steam |
| E. | Air at high pressures |
| Answer» E. Air at high pressures | |
| 478. |
A spherical gas tank is made of 1 cm steel plate hemispheres but welded together. The tank is 1503 cm in diameter. The allowable internal pressure to which tank may be subjected is the permissible stress be limited to 840 kg/sq cm would be in the range |
| A. | 2.0 to 2.5 kg/sq-cm |
| B. | 3.5 to 5.0 kg/sq-cm |
| C. | 2.5 to 3.5 kg/sq-cm |
| D. | 1.5 to 2.0 kg/sq-cm |
| E. | 1 to 1.5 kg/sq-cm |
| Answer» B. 3.5 to 5.0 kg/sq-cm | |
| 479. |
If the shearing stress in a nut is equal to half the tensile stress in a bolt then the length of nut should be equal to |
| A. | Diameter of the bolt |
| B. | 1.50 times diameter of the bolt |
| C. | 1.25 times diameter of the bolt |
| D. | 0.75 times the diameter of the bolt |
| E. | 0.5 times diameter of the bolt |
| Answer» E. 0.5 times diameter of the bolt | |
| 480. |
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» E. Increasing the diameter of threaded portion | |
| 481. |
In elevated circular steel tanks, conical bottoms are attached when |
| A. | Increasing the diameter of threaded portion |
| B. | water is alkaline |
| C. | water is oily |
| D. | water is acidic |
| E. | water is muddy |
| Answer» F. | |
| 482. |
A motor weighing 2000 kg is to be lifted by wrought iron eye bolt, screwed into the frame. Clioose-single bolt out of the following |
| A. | M 30 coarse threads |
| B. | M 12 fine threads |
| C. | None as wrought iron is brittle |
| D. | M 12 coarse threads |
| E. | M 30 Fine threads |
| Answer» B. M 12 fine threads | |
| 483. |
The maximum strain at the end of plastic range of structural steel is about |
| A. | 1.5 percent |
| B. | 15.0 percent |
| C. | Increasing the diameter of threaded portion |
| D. | 11.0 percent |
| E. | 0.11 percent |
| Answer» B. 15.0 percent | |
| 484. |
In a cotter joint in order to ensure that cotter does not work back |
| A. | The taper on cotter should not exceed 1 in 24 |
| B. | Cotter should be made of stronger material |
| C. | The taper on cotter should be more than 1 in 24 |
| D. | Cotter should be made thick |
| E. | Shear pins should be applied on the cotter |
| Answer» B. Cotter should be made of stronger material | |
| 485. |
When the bolt is subjected to shock loading the resilience of the bolt should be considered in order to prevent breakege at |
| A. | Anywhere |
| B. | Shank |
| C. | Threaded portion |
| D. | Head |
| E. | Transition between head and shank |
| Answer» D. Head | |
| 486. |
A compressed air cylinder carries approximately 70 kg/cm2 pressure at the time of delivery. The inside diameter is 25 cm. If the steel has a yield point of 2300 kg/sq cm and a safety factor of 2.5 the wall thickness should be |
| A. | 10 mm |
| B. | 15 mm |
| C. | 8 mm |
| D. | 12 mm |
| E. | 5 mm |
| Answer» B. 15 mm | |
| 487. |
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» E. None of the above | |
| 488. |
St, Venant's theory for failure of material is based on |
| A. | maximum shear stress |
| B. | maximum strain energy |
| C. | maximum tensile stress |
| D. | none of the above |
| E. | Increasing the diameter of threaded portion |
| Answer» C. maximum tensile stress | |
| 489. |
The differential equation 10x + 9 x + 810x = 0 describes a one degree of freedom system. The natural frequency of the system is |
| A. | 90 cycles per second |
| B. | 9 cycles per second |
| C. | 10 cycles per second |
| D. | 90 sycles per second |
| E. | 9 radians per second |
| Answer» F. | |
| 490. |
The concentric helical springs are wound in opposite direction |
| A. | to maintain identical shear stress in the two springs |
| B. | Increasing the diameter of threaded portion |
| C. | to maintain identical stiffness in both springs |
| D. | to avoid unequal deflection in the two springs |
| E. | to avoid binding of adjacent coils |
| Answer» F. | |
| 491. |
The average values of modulus of rigidity for aluminium brass, copper and steel in descending order is |
| A. | Aluminium, nickel, brass, copper and steel |
| B. | Aluminium, copper, nickel, brass and steel |
| C. | Aluminium, copper, brass, nickel and steel |
| D. | Aluminium, brass, copper, nickel and steel |
| E. | Aluminium, brass, nickel, copper and steel |
| Answer» E. Aluminium, brass, nickel, copper and steel | |
| 492. |
The rivet diameter should be |
| A. | More than plate thickness |
| B. | Less than the plate thickness |
| C. | Equal to the plate thickness |
| D. | Equal to the strap thickness |
| E. | Half the plate thickness |
| Answer» B. Less than the plate thickness | |
| 493. |
A thin cylinder contains fluid at a pressure of 30 kg kg/cm2, the internal diameter of the shell is 60 cm and the tensile stress in the material is to be limited to 900 kg/cm2. The shell must have a minimum wall thickness of |
| A. | 10 mm |
| B. | 9 mm |
| C. | 1 mm |
| D. | 27 mm |
| E. | 12 mm |
| Answer» B. 9 mm | |
| 494. |
In a ball bearing steel balls are made of |
| A. | Carbon steel |
| B. | Stainless steel |
| C. | Cast iron |
| D. | Carbon chrome steel |
| E. | Brass |
| Answer» E. Brass | |
| 495. |
In the case of roller bearings the contacting areas between rollers and running tracks are |
| A. | Cast steel |
| B. | oblong |
| C. | parabolic |
| D. | elliptical |
| E. | circular |
| Answer» C. parabolic | |
| 496. |
If machine number is loaded in such a way that the three principla stresses at a point are 600 kg/cm2 compression. 800 kg/cm2 tension and zero. The maximum shear stress at the point will be |
| A. | 700 kg/cm2 |
| B. | 600 kg/cm2 |
| C. | 1000 kg/cm2 |
| D. | 800 kg/cm2 |
| E. | 200 kg/cm2 |
| Answer» B. 600 kg/cm2 | |
| 497. |
The loading on a pinion gear is usually |
| A. | Compression |
| B. | Tension |
| C. | Shear |
| D. | Cyclic loading |
| E. | None of the above |
| Answer» E. None of the above | |
| 498. |
The critical speed of a shaft is affected by |
| A. | Diameter of the disc |
| B. | Eccentricity |
| C. | Span of the shaft |
| D. | All of the above |
| E. | None of the above |
| Answer» E. None of the above | |
| 499. |
In case of sunk key |
| A. | The key way is helical along the shaft |
| B. | The key way is cut in bub only |
| C. | The key way is cut in both shaft and hub |
| D. | The key way is cut in shaft only |
| E. | The key is in two parts |
| Answer» D. The key way is cut in shaft only | |
| 500. |
Operation of helical gears is silent and quiet while the operation of the spur gears is noisy because |
| A. | helical gears have some helix angle but the spur gears are straight |
| B. | there is end thrust in helical gears |
| C. | in helical gears, contact begins at one end of the entering tooth and gradually extends along a diagonal line across the tooth face as the gears rotate |
| D. | none of the above |
| E. | Cast steel |
| Answer» D. none of the above | |