McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 601. |
Two beams carrying uniformly distributed load have same depth but beams A has width 2nd as compared to width w for beam B. The ratio of elastic strength of beam A compred to that of B will be |
| A. | 4 |
| B. | 1 |
| D. | The beam is rectangular in section |
| E. | 2 |
| Answer» E. 2 | |
| 602. |
If two unequal rolling loads of unequal weight roll along a beam, the maximum bending moment will occur |
| A. | Under heavy load when the centre of the load is at the centre of beam |
| B. | Under heavy load when the centre of the lighy load is at the centre of the beam. |
| C. | Under heavy load |
| D. | Under light load when centre of the beam bisects the distance between the resultant of the loads and light wheel |
| E. | Under heavy load when the centre of the beam oisects the distance between the resultant of the loads and ligh wheel |
| Answer» E. Under heavy load when the centre of the beam oisects the distance between the resultant of the loads and ligh wheel | |
| 603. |
The loss of strength in compression with simultaneous gain in srength in tension due to overloading is known as |
| A. | Banschinger effect |
| B. | Visco-elasticity |
| C. | Hysteresis |
| D. | Creep |
| E. | Inelasticity |
| Answer» A. Banschinger effect | |
| 604. |
The kern of a circular section of diameter D is a concentric circular area of diameter |
| A. | 2/3 D |
| B. | 3/4 D |
| C. | D/8 |
| D. | D/4 |
| E. | 3/5 D |
| Answer» D. D/4 | |
| 605. |
Tensile stress is |
| A. | Stress measured by the ratio of the increase or decrease in length of the unloaded piece |
| B. | Stress due to any force |
| C. | Stress caused by varying load |
| D. | Stress measured by the ratio of the increase or decrease in length of the unloaded piece under tensile force |
| E. | Stress due to change in length under a load |
| Answer» D. Stress measured by the ratio of the increase or decrease in length of the unloaded piece under tensile force | |
| 606. |
The longitudinal strain for a specimen is 0.01 and it is found to undergo 1 mm change in its thickness. The thickness of the specimen will be |
| A. | 10 mm |
| B. | 100 mm |
| C. | 1000 mm |
| D. | 400 mm |
| E. | None of the above |
| Answer» B. 100 mm | |
| 607. |
Identify the incorrect statement about true stress-strain method |
| A. | This method can be used for compression tests as well |
| B. | True stress is load per unit area (actual) and sunilarly true strain is determined under actual conditions |
| C. | It is more sensitive to changes in mechanical conditions |
| D. | It is more sensitive to changes in metallurgical conditions |
| E. | There is no such phenomenon like true stress or true strain |
| Answer» E. There is no such phenomenon like true stress or true strain | |
| 608. |
Perry-Robertson formula for columns takes into account |
| A. | initial curvature of column |
| B. | initial eccutricity of column |
| C. | both (A) and (B) above |
| D. | None of the above |
| E. | None of the above |
| Answer» C. both (A) and (B) above | |
| 609. |
A simply supported beam of span L which carries over its full span a load varying uniformly from zero at either ends to W kg/m at mid-span, will have zero shear force at |
| A. | Ends |
| B. | Mid-spam |
| C. | Both at ends as well as mid-span |
| D. | At L/4 from either end |
| E. | None of the above |
| Answer» B. Mid-spam | |
| 610. |
According to Von Mises theory, the elastic failure occurs |
| A. | When the shear strain energy is least |
| B. | When shear strain equals 50% of the value of tensile strain at elastic limit in a simple tension test |
| C. | When the shear strain energy per unit volume in the stressed material equals shear strain energy per unit volume at the elastic limit in a simple tension test |
| D. | None of the above |
| E. | None of the above |
| Answer» C. When the shear strain energy per unit volume in the stressed material equals shear strain energy per unit volume at the elastic limit in a simple tension test | |
| 611. |
The slenderness ratio of a column is zero when |
| A. | its length is exactly equal to radius of gyration |
| B. | its length is half the radius of gyration |
| C. | total load carried is less than half the dead weight |
| D. | its length is supported on all sides throughout its full length |
| E. | None of the above |
| Answer» D. its length is supported on all sides throughout its full length | |
| 612. |
The ratio of shear modulus to the modulus of elasticity when Poisson's ratio is 0.25 will be |
| A. | 0.4 |
| B. | 4 |
| C. | 1.4 |
| D. | 2 |
| E. | 3 |
| Answer» A. 0.4 | |
| 613. |
The theory of failure suitable for brittle materials is |
| A. | distortion energy theory |
| B. | maximum strain energy theory |
| C. | maximum shear stress theory |
| D. | maximum principal stress theory |
| E. | None of the above |
| Answer» D. maximum principal stress theory | |
| 614. |
A seamless water main 1 metre in diameter is required to carry wter under a head of 100 metres. If the maximum permissible tensile stress in the metal is 500 kg/cm2, the thickness of metal required would be |
| A. | 25 mm |
| B. | 10 mm |
| C. | 5 mm |
| D. | 15 mm |
| E. | 1 mm |
| Answer» B. 10 mm | |
| 615. |
The ratio of central deflection in a beam freely supported at both ends to that when the beam is fixed at both ends and subjected to a central load W in both the cases would be |
| B. | 1 |
| C. | 4 |
| E. | 2 |
| Answer» C. 4 | |
| 616. |
The moment of inertia of an area is always least with respect to |
| A. | Bottom most axis |
| B. | Radius of gyration |
| C. | Central axis |
| D. | Vertical axis |
| E. | None of the above |
| Answer» C. Central axis | |
| 617. |
In case of eccentrically loaded struts |
| A. | Hollow section is preferred |
| B. | Solid section is preferred |
| C. | Composite section is preferred |
| D. | Reinforced section is preferred |
| E. | Any of the above sections mauy be used |
| Answer» A. Hollow section is preferred | |
| 618. |
The relation between the bending moment and the moment of resistance e.g. M=fZ applies |
| A. | Only to beams of circular cross-section |
| B. | Only to beams of rectangular cross-section |
| C. | When the beams are strained beyond the elastic limit |
| D. | When the beams are not strained beyond the elastic limit |
| E. | None of the above |
| Answer» D. When the beams are not strained beyond the elastic limit | |
| 619. |
A boiler shell 100 cm diameter and plate thickness 12 mm is subjected to an internal pressure of 1.2 N/m2. The hoop stress will be |
| A. | 45 N/m2 |
| B. | 135 N/m2 |
| C. | 180 N/m2 |
| D. | 50 N/m2 |
| E. | 155.5 N/m2 |
| Answer» D. 50 N/m2 | |
| 620. |
Unsymmetrical bending is said to occur when |
| A. | The bending moment diagram is unsymmetrical |
| B. | The shear centre does not coincide with neutral axis |
| C. | The beam is subjected to loads that do not lie in a plane containing a principal axis |
| D. | The beam is subjected to thrust in addition to bending moment |
| E. | The beam cross-section is unsymmetrical |
| Answer» A. The bending moment diagram is unsymmetrical | |
| 621. |
The column with highest equivalent length has |
| A. | Both ends fixed |
| B. | Both ends hinged and pin jointed |
| C. | One end fixed other end hinged |
| D. | None of the above |
| E. | Measurement of longitudinal strains |
| Answer» B. Both ends hinged and pin jointed | |
| 622. |
Rivets are generally specified by |
| A. | Diameter of head |
| B. | Overall length |
| C. | Shape |
| D. | Shank diameter |
| E. | Thickness of plates to be joined |
| Answer» D. Shank diameter | |
| 623. |
Brass could not be used to reinforce concrete because |
| A. | its densily is too large |
| B. | its density is too low |
| C. | it is too expensive |
| D. | its coefficient of thermal expansion is not right |
| E. | None of the above |
| Answer» D. its coefficient of thermal expansion is not right | |
| 624. |
In a simply supported beam of span 3 mts., a point load of 60 kN acts at a distance of 1 mt. from left support, the shear force at 1 mt. from rt. Support is |
| A. | Moment shear relation |
| B. | 40 kN |
| C. | 60 kN |
| D. | 20 kN |
| E. | 80 kN |
| Answer» D. 20 kN | |
| 625. |
The assumptions generally made in the theory of pure bending is |
| A. | The transverse section of the beam suffers permanent distortion |
| B. | The value of the Young's modulus is the same for the beam material in tension as well as in compression |
| C. | The beam is rectangular in section |
| D. | The material of the beam is non-homogeneous |
| E. | The elastic limit is well exceeded |
| Answer» B. The value of the Young's modulus is the same for the beam material in tension as well as in compression | |
| 626. |
For an isotropic, homogeneous and elastic material, which obeys Hooke's law, the number of independent elastic constants is |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 6 |
| E. | None of the above |
| Answer» B. 2 | |
| 627. |
A steel wire is hang vertically under its own weight. What is the greatest length it can have if the allowable tensile stress is 2000 kg/cm2 and specific weight of steel is 8000 kg/cm |
| A. | 2500 m |
| B. | 3155 m |
| C. | 1250 m |
| D. | 1750 m |
| E. | 2797 m |
| Answer» A. 2500 m | |
| 628. |
If the value of Young's modulus of elasticity is zero, it implies that the material is |
| A. | highly elastic |
| B. | plastic |
| C. | visco-elastic |
| D. | incompressible |
| E. | None of the above |
| Answer» D. incompressible | |
| 629. |
A bar of copper form a composite system, which is heated to a temperature of 45?C. The stress in the copper bar will be |
| A. | tensile stress |
| B. | compressive stress |
| C. | bursting stress |
| D. | sher stress |
| E. | None of the above |
| Answer» B. compressive stress | |
| 630. |
A brittle steel rod is heated to 160?C and then suddenly clamped at both ends. It is then allowed to cool and breaks at a temperature of 85?C. If E = 200 GN/m2 and ? = 12 x 10-5 / ?C, the breaking stress of steel is |
| A. | 60 MN / m2 |
| B. | 90 MN / m2 |
| C. | 180 MN / m2 |
| D. | 360 MN / m2 |
| E. | None of the above |
| Answer» C. 180 MN / m2 | |
| 631. |
Castellated beams are used for |
| A. | light construction |
| B. | resisting bending moment only |
| C. | loads not passing through shear centre |
| D. | sections subjected to alternate compressive and shear stresses |
| E. | None of the above |
| Answer» A. light construction | |
| 632. |
For a thin cylinder the ratio longitudinal stress/hoop stress is |
| B. | 1 |
| C. | 4 |
| D. | 2 |
| E. | Between CD |
| Answer» B. 1 | |
| 633. |
The failure of a material under varying load, after a number of cycles of such load, is known as |
| A. | Brittle failure |
| B. | Fatigue failure |
| C. | Hysteresis failure |
| D. | Impact failure |
| E. | Ductile failure |
| Answer» B. Fatigue failure | |
| 634. |
The yield point in fatique loading as compared to the yield point in static loading is |
| A. | Half |
| B. | There is no comparison between the two |
| C. | Higher |
| D. | Same |
| E. | One fourth |
| Answer» C. Higher | |
| 635. |
The slenderness rtio of a column is zero when |
| A. | its length is exactly equal to radius of gyration |
| B. | its length is half the radius of gyration |
| C. | total load carried is less than half the dead weight |
| D. | its length is supported on all sides throughout its full length |
| E. | None of the above |
| Answer» D. its length is supported on all sides throughout its full length | |
| 636. |
A perfect frame has N joints. The number of members should not be less than |
| A. | 2N - 5 |
| B. | 2N - 3 |
| C. | 2N - 1 |
| D. | N - 1 |
| E. | 2N - 2 |
| Answer» B. 2N - 3 | |
| 637. |
Rupture stress is |
| A. | Breaking stress |
| B. | Highest value of stress |
| C. | Stress at breaking point |
| D. | Proof stress |
| E. | Stress given by dividing the load at the moment of incipient fracture, by the area supporting that load |
| Answer» E. Stress given by dividing the load at the moment of incipient fracture, by the area supporting that load | |
| 638. |
Which material has highest value of Poisson's ratio |
| A. | Copper |
| B. | Steel |
| C. | Wood |
| D. | Rubber |
| E. | Concrete |
| Answer» D. Rubber | |
| 639. |
The value of Poisson's ratio for cork is |
| A. | 0.44 |
| B. | 0.1 |
| C. | Zero |
| D. | 0.2 |
| E. | 0.3 |
| Answer» C. Zero | |
| 640. |
The approximate value of allowable stress for carbon steel under static loading (in kg/cm2) is |
| A. | 500 - 1000 |
| B. | 4000 - 7500 |
| C. | 10,000 - 15,000 |
| D. | 15,000 - 20,000 |
| E. | 20,000 - 25,000 |
| Answer» B. 4000 - 7500 | |
| 641. |
A type of riveted joint in which the rivets in the adjacent rows are staggered and the outer-most row has only rivert, is known as |
| A. | Chain riveting |
| B. | Butt-riveting |
| C. | Diamond riveting |
| D. | Criss-cross riveting |
| E. | Zig-zag riveting |
| Answer» C. Diamond riveting | |
| 642. |
The state of pure shear stress is produced by |
| A. | equal tension in two directions at right angles |
| B. | equal compression in two-directions at right angle |
| C. | tension in one direction and equal compression in perpendicular direction |
| D. | a moment and couple in opposite directions |
| E. | None of the above |
| Answer» C. tension in one direction and equal compression in perpendicular direction | |
| 643. |
Principal planes are the planes on which the resultant stress is the |
| A. | shear stress |
| B. | normal stress |
| C. | tangential stress |
| D. | temperature stress |
| E. | None of the above |
| Answer» B. normal stress | |
| 644. |
If a column fails due to buckling, it is likely to be a |
| A. | Long column |
| B. | Short column |
| C. | Strut |
| D. | Reinforced column |
| E. | None of the above |
| Answer» A. Long column | |
| 645. |
The numerical values of Young's modulus of clasticity in ascending order for Aluminium, Bronze, Brass, Inconel and Muntz metal are given by |
| A. | Aluminium, Bronze, Brass, Muntz metal, Inconel. |
| B. | Muntz metal, Aluminium, Bronze, Brass, Inconel |
| C. | Muntz metal, Brass, Aluminium, Bronze, Inconel |
| D. | Inconel, Muntz metal, Aluminium, Bronze, Brass |
| E. | Aluminium, Bronze, Muntz metal, Inconel, Brass |
| Answer» C. Muntz metal, Brass, Aluminium, Bronze, Inconel | |
| 646. |
The tangential stress is |
| A. | 21.5 MPa |
| B. | 36 MPa |
| C. | 48 MPa |
| D. | 26 MPa |
| E. | None of the above |
| Answer» B. 36 MPa | |
| 647. |
A solid circular shaft of diameter D carries are axial load W. If the same load is applied axially on a hollow circular shaft of inner diameter D/2, the ratio of stress in a solid shaft to a hallow one is |
| A. | 1?4 |
| B. | 4?3 |
| C. | 1?2 |
| D. | Moment shear relation |
| E. | 3?4 |
| Answer» E. 3?4 | |
| 648. |
a diagram which respresents the variation of axial load along the length of simply supported beam is called |
| A. | Shear force diagram |
| B. | Bending moment diagram |
| C. | Stress diagram |
| D. | Thrust diagram |
| E. | None of the above |
| Answer» D. Thrust diagram | |
| 649. |
Eccentrically loaded columns are generally subjected to |
| A. | axial compression and tension |
| B. | bending stress and axial compression |
| C. | shear stress and axial compression |
| D. | bending stress, shear stress and axial compression |
| E. | None of the above |
| Answer» C. shear stress and axial compression | |
| 650. |
The stress in the cylinder will be |
| A. | 12 N/mm2 |
| B. | 24 N/mm2 |
| C. | 6 N/mm2 |
| D. | 20 N/mm2 |
| E. | 18 N/mm2 |
| Answer» A. 12 N/mm2 | |
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