McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 801. |
In case of non-dilatent materials, the maximum value of Poisson's ratio is |
| A. | 0.5 |
| B. | 0.25 |
| C. | 0.33 |
| D. | 0.47 |
| E. | 0.6 |
| Answer» A. 0.5 | |
| 802. |
A self-supporting steel chimney transmits the lateral forces to the foundation by |
| A. | fixed beam action |
| B. | proposed beam action |
| C. | cantilever action |
| D. | simply supported beam action |
| E. | None of the above |
| Answer» C. cantilever action | |
| 803. |
The phenomenon under which the strain of a material varies under constant stress is known as |
| A. | Buchinger's effect |
| B. | Hysteresis |
| C. | Visco-elasticity |
| D. | Creep |
| E. | Strain hardening |
| Answer» D. Creep | |
| 804. |
The strength of a riveted plate in tearing should be based on |
| A. | the rivet diameter |
| B. | the rivet hole diameter |
| C. | the average of (A) and (B) above |
| D. | the average of (A) and (B) above plus 2 mm. |
| E. | None of the above |
| Answer» B. the rivet hole diameter | |
| 805. |
The Erichsen cupping number of a sheet metal indicates its |
| A. | Surface roughness |
| B. | Drawing quality |
| C. | Hardness |
| D. | Ductility |
| E. | Toughness |
| Answer» B. Drawing quality | |
| 806. |
The limiting value of span to depth ratio will be least in case of |
| A. | simply supported slabs spanning in one direction |
| B. | simply supported slabs spanning in two directions |
| C. | continuous salb spanning in one direction |
| D. | cantilever slabs |
| E. | None of the above |
| Answer» D. cantilever slabs | |
| 807. |
A load of 10,000 kg is applied to copper cylinder 20 cm long and 5 cm in diameter causes the length to increase by 4 mm and diameter to decrease by 0.4 mm. The Poisson's ratio for copper would be |
| A. | 0.33 |
| B. | 0.4 |
| C. | 0.25 |
| D. | 0.23 |
| E. | 0.6 |
| Answer» B. 0.4 | |
| 808. |
The allowable stresses for the design of steel chimney depend upon the ratio of |
| A. | area of cylindrical portion of the area flared portion |
| B. | volume of cylindrical portion to the volume of flared portion |
| C. | weight of cylindrical portion to the weight of the flared portion |
| D. | effective height to the radius of gyration |
| E. | None of the above |
| Answer» D. effective height to the radius of gyration | |
| 809. |
When a beam having square cross-section is loaded longitudinally, the shear stress develops |
| A. | On middle fibre in vertical plane |
| B. | On top fibre in horizontal plane |
| C. | Equally on each fibre along horizontal plane |
| D. | Along the diagonal |
| E. | One middle fibres in horizontal plane |
| Answer» C. Equally on each fibre along horizontal plane | |
| 810. |
A solid circular shaft and a thin walled circular tube made of the same material and having the same weight are stressed in torsion to the same maximum shear stress. The ratio of the amounts of strain energy stored in the two shafts would be |
| A. | 1?4 |
| B. | 1 |
| C. | 2 |
| D. | ? |
| E. | 1?2 |
| Answer» D. ? | |
| 811. |
A bolt of nominal diameter 33 mm having a safe tensile stress of 100 N/mm2 can safely carry a load of |
| A. | 260 kN |
| B. | 100 kN |
| C. | 150 kN |
| D. | 160 kN |
| E. | 60 kN |
| Answer» E. 60 kN | |
| 812. |
The number of elastic constants for a completely anisotropic elastic material which follows Hooke's law, is |
| A. | 25 |
| B. | 21 |
| C. | 4 |
| D. | 2 |
| E. | 3 |
| Answer» B. 21 | |
| 813. |
A masonry dam is liable to fail |
| A. | By sliding on the soil on which it rests |
| B. | Over overturning |
| C. | Due to tensile stress developed |
| D. | Due to excessive compressive stresses |
| E. | Any of the above |
| Answer» E. Any of the above | |
| 814. |
The modulus of resilience in tension is nearly |
| A. | 65 kJ/m3 |
| B. | 130 kJ/m3 |
| C. | 210 kJ/m3 |
| D. | 260 kJ/m3 |
| E. | None of the above |
| Answer» D. 260 kJ/m3 | |
| 815. |
The shape of the Kem area for a rectangular section is |
| A. | Rhombus |
| B. | Rectangle |
| C. | Square |
| D. | Parallelogram |
| E. | Circle |
| Answer» D. Parallelogram | |
| 816. |
For any shaft the number of critical speed is |
| A. | infinite |
| B. | depends on size and load |
| C. | 2 |
| D. | 1 |
| E. | depends on external load and moment of inertia |
| Answer» A. infinite | |
| 817. |
The ratio of Bulk modulus to shear modulus for Poisson's ratio of 0.25 will be |
| A. | 5?3 |
| B. | 3?2 |
| C. | 2?3 |
| D. | 5?6 |
| E. | 1 |
| Answer» A. 5?3 | |
| 818. |
In case of a hinged support, the reaction |
| A. | Acts perpendicular to the beam |
| B. | In a direction which depends on the loads |
| C. | Acts in a direction opposite to the resultant shear force at the support |
| D. | Acts perpendicular to the surface of hinge |
| E. | Acts along the axis of beam |
| Answer» C. Acts in a direction opposite to the resultant shear force at the support | |
| 819. |
The limiting values of Poisson's ratio are |
| A. | 0 and 1 |
| B. | ?1 and +1 |
| C. | ?0.5 and +0.5 |
| D. | ?1 and +0.5 |
| E. | None of the above |
| Answer» D. ?1 and +0.5 | |
| 820. |
The effect of arching a beam is to |
| A. | increase the shear force |
| B. | reduce the shear force |
| C. | reduce the bending moment throughout |
| D. | increase the bending moment throughout |
| E. | None of the above |
| Answer» C. reduce the bending moment throughout | |
| 821. |
A beam supported at more than two places is known as |
| A. | Flitched beam |
| B. | Uniform beam |
| C. | Continuous beam |
| D. | Economical beam |
| E. | None of the above |
| Answer» C. Continuous beam | |
| 822. |
A spring steel ribbon 3.2 mm wide, 0.5 mm thick is wound on a 500 mm diameter cylinder. If E = 2 x 105 N/mm2, the maximum stress in the steel will be |
| A. | 100 N/mm2 |
| B. | 200 N/mm2 |
| C. | 400 N/mm2 |
| D. | 800 N/mm2 |
| E. | None of the above |
| Answer» B. 200 N/mm2 | |
| 823. |
In a universal testing machine during the testing of a specimen of original cross-sectional area 1 cm2 the maximum load appliied was 7.5 tonnes and neck area 0.6 sq. cm. The ultimate tensile strength of the specimen is |
| A. | 12.5 tonnes/cm2 |
| B. | 10.0 tonnes/cm2 |
| C. | 7.5 tonnes/cm2 |
| D. | 4.5 tonnes/cm2 |
| E. | None of the above |
| Answer» C. 7.5 tonnes/cm2 | |
| 824. |
It is desired to punch a hole of 20 mm diameter in a plate 20 mm think. If the shear stress of mild steel is 30 kg/mm2, the force necessary for punching would be approximately in the range |
| A. | 20 - 25 tonnes |
| B. | 15 - 20 tonnes |
| C. | 10 - 15 tonnes |
| D. | 35 - 40 tonnes |
| E. | 25 - 35 tonnes |
| Answer» D. 35 - 40 tonnes | |
| 825. |
A spherical pressure vessel is made of thin magnesium plate 0.25 cm thick. The main diameter of the sphere is 600 cm and allowable stress in tension is 900 kg/cm2. The safe internal gas pressure for the vessel would be |
| A. | 5.5 kg/cm2 |
| B. | 3.0 kg/cm2 |
| C. | 0.5 kg/cm2 |
| D. | 4.77 kg/cm2 |
| E. | 1.5 kg/cm2 |
| Answer» E. 1.5 kg/cm2 | |
| 826. |
Materials exhibiting time bound behaviour are known as |
| A. | Anelastic |
| B. | Visco elastic |
| C. | Reactive |
| D. | Fissile |
| E. | Isentropic |
| Answer» B. Visco elastic | |
| 827. |
The shear stress when a circular shaft subjected to torsion is |
| A. | maximum, maximum |
| B. | minimum, minimum |
| C. | maximum, minimum |
| D. | minimum, maximum |
| E. | None of the above |
| Answer» C. maximum, minimum | |
| 828. |
The deflection of a beam may be reduced by |
| A. | decreasing the depth of beam |
| B. | increasing the span |
| C. | providing greater end restrains |
| D. | any of the above methods |
| E. | None of the above |
| Answer» C. providing greater end restrains | |
| 829. |
The safe working pressure for a spherical vessel 1.5 m diameter and 1.5 cm wall thickness with limiting tensile stress of 450 kg/cm2 would be |
| A. | 18 kg/cm2 |
| B. | 36 kg/cm2 |
| C. | 4.5 km/cm3 |
| D. | 9 kg/cm2 |
| E. | 45 kg/cm2 |
| Answer» A. 18 kg/cm2 | |
| 830. |
For a shear force to be uniform throughout the span of a simply supported beam, it should be subjected to |
| A. | a couple at mid span |
| B. | a couple at any point on the span |
| C. | a uniformly distributed load |
| D. | two concentrated loads spaced at third points |
| E. | None of the above |
| Answer» A. a couple at mid span | |
| 831. |
A cylindrical section having no joint is known as |
| A. | Perfect section |
| B. | Strong section |
| C. | Jointless section |
| D. | Seamless section |
| E. | Stress free section |
| Answer» D. Seamless section | |
| 832. |
Poisson's ratio for cast iron is |
| A. | 0.38 |
| B. | 0.36 |
| C. | 0.27 |
| D. | 0.33 |
| E. | 0.31 |
| Answer» C. 0.27 | |
| 833. |
A beam of uniform strength is one in which |
| A. | The bending stress is same at every section |
| B. | The bending moment is same at every section |
| C. | The cross-section is same throughout |
| D. | The stiffness is same at every section |
| E. | The load on fibres is same at every section |
| Answer» A. The bending stress is same at every section | |
| 834. |
A material which undergoes no deformation till its yield point is reached and then it flows at a constant stress is known as |
| A. | 25 |
| B. | Rigid-plastic |
| C. | Elasto-plastic |
| D. | Plasto-electric |
| E. | Rigid-elastic |
| Answer» B. Rigid-plastic | |
| 835. |
The neutral axis of beam |
| A. | Is subjected to maximum stress |
| B. | Is subjected to maximum shear force |
| C. | Has tensile stress on one side and compressive stress on the other |
| D. | Is in the same plane in which the beam bends |
| E. | None of the above |
| Answer» C. Has tensile stress on one side and compressive stress on the other | |
| 836. |
For which of the following diameters a seam-less pipe of 3 mm wall thickness will be considered as a thin walled cylinder? |
| A. | 30 mm |
| B. | 60 mm |
| C. | 80 mm |
| D. | 90 mm |
| E. | All of the above |
| Answer» A. 30 mm | |
| 837. |
All elastic materials |
| A. | Elongate on the application of load |
| B. | Shrink on the application of load |
| C. | Permanently deform under load |
| D. | Do not deform under load |
| E. | None of the above |
| Answer» A. Elongate on the application of load | |
| 838. |
The heaviest I section for the same depth is |
| A. | ISMB |
| B. | ISLB |
| C. | ISHB |
| D. | ISWB |
| E. | None of the above |
| Answer» C. ISHB | |
| 839. |
When a no. of loads rest upon a beam, the deflection at any point is equal to the sum of the deflections at this point due to each of the loads taken separately. This is according to |
| A. | Moment shear relation |
| B. | Theory of flexure |
| C. | Principle of least work |
| D. | Castiglano's theorem |
| E. | Max's well theorem |
| Answer» E. Max's well theorem | |
| 840. |
A form factor is introduced in the design of compressive members to represent the effect of |
| A. | local buckling |
| B. | voids |
| C. | grain orientation |
| D. | diagonal buckling |
| E. | None of the above |
| Answer» A. local buckling | |
| 841. |
As compared to the Brinell hardness lest, the Rockwell method |
| A. | makes a thinner indentation |
| B. | may be used on thicker materials |
| C. | is much slower |
| D. | all of the above |
| E. | None of the above |
| Answer» A. makes a thinner indentation | |
| 842. |
Two cantilever beams are of equal length. One carries a uniformly distributed load and other carries same load but concentrated at the free end. The ratio of maximum deflection is |
| A. | 2?3 |
| B. | 5?12 |
| C. | 1?3 |
| D. | 1?2 |
| E. | 5?6 |
| Answer» E. 5?6 | |
| 843. |
In a three-hinged beam, the bending moment will be zero at |
| A. | the left hinge |
| B. | the right hinge |
| C. | both the hinges |
| D. | the crown |
| E. | None of the above |
| Answer» D. the crown | |
| 844. |
Arching of a beam results in |
| A. | increased bending moment throughout |
| B. | reduced bending moment throughout |
| C. | increased bending moment at the support |
| D. | no change in bending moment |
| E. | None of the above |
| Answer» B. reduced bending moment throughout | |
| 845. |
A dead load is |
| A. | One that can be neglected |
| B. | One that does not exist |
| C. | One that is dead |
| D. | One that remains constant. |
| E. | One that does not move |
| Answer» D. One that remains constant. | |
| 846. |
In the simple bending theory one of the assumptions usually made is that the plane sections before bending remain plane after bending. This assumption implies that |
| A. | Stress is proportional to the distance from the neutral axis |
| B. | Stress is uniform in the beam cross section |
| C. | Stress is proportional to strain at all section |
| D. | Stress is uniform in the beam cross-section |
| E. | Strain is proportional to the distance from the neutral axis |
| Answer» E. Strain is proportional to the distance from the neutral axis | |
| 847. |
Along the principal plane subjected to maximum principal shear |
| A. | The maximum shear stress acts |
| B. | The minimum shear stress acts |
| C. | No shear stress acts |
| D. | Any of the above |
| E. | None of the above |
| Answer» C. No shear stress acts | |
| 848. |
If the value of Young's modulus of elasticity for a material is zero, it implies that the material |
| A. | is in gaseous state |
| B. | is visco-elastic |
| C. | incompressible |
| D. | plastic |
| E. | None of the above |
| Answer» C. incompressible | |
| 849. |
A steel shaft 6 mm in diameter turns at 10,000 r.p.m. the safe working stress in shear is 350 kg/cm2. The maximum power that such a shaft may develop is approximately |
| A. | 2 |
| B. | 2.45 |
| C. | 1 |
| D. | 0.5 |
| E. | 1.73 |
| Answer» A. 2 | |
| 850. |
The area around the centre of gravity of a cross-section within which any load applied will produce stress of only one sign throughout the entire cross-section, is known as |
| A. | Symmetrical |
| B. | Centroid |
| C. | Kern |
| D. | Neutral zone |
| E. | Balance zone |
| Answer» C. Kern | |
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