McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 551. |
When a body is subjected to a direct tensile stress (?) in one plane, then maximum normal stress occurs at a section inclined at |
| A. | 0? |
| B. | 30? |
| C. | 45? |
| D. | 90? |
| Answer» A. 0? | |
| 552. |
The object of caulking in a riveted joint is to make the joint |
| A. | free from corrosion |
| B. | stronger in tension |
| C. | free from stresses |
| D. | leak-proof |
| Answer» D. leak-proof | |
| 553. |
The tensile test is carried on |
| A. | ductile |
| B. | brittle |
| C. | malleable |
| D. | plastic |
| Answer» A. ductile | |
| 554. |
The critical neutral axis of a reinforced cement concrete beam is based on the principle that the neutral axis is situated at the centre of gravity of a given section. |
| A. | True |
| B. | False |
| Answer» A. True | |
| 555. |
Transverse fillet welds are designed for |
| A. | tensile strength |
| B. | compressive strength |
| C. | shear strength |
| D. | bending strength |
| Answer» A. tensile strength | |
| 556. |
Lame's theory is associated with |
| A. | thin cylindrical shells |
| B. | thick cylindrical shells |
| C. | direct and bending stresses |
| D. | none of these |
| Answer» B. thick cylindrical shells | |
| 557. |
Two solid shafts 'A' and 'B' are made of the same material. The shaft 'A' is of 50 mm diameter and shaft 'B' is of 100 mm diameter. The strength of shaft 'B' is |
| A. | one-half |
| B. | double |
| C. | four times |
| D. | eight times |
| Answer» D. eight times | |
| 558. |
The bending moment in the centre of a simply supported beam carrying a uniformly distributed load of w per unit length is |
| A. | zero |
| B. | wl2 / 2 |
| C. | wl2 / 4 |
| D. | wl2 / 8 |
| Answer» D. wl2 / 8 | |
| 559. |
When a body is subjected to a direct tensile stress (?) in one plane, then normal stress on an oblique section of the body inclined at an angle ? to the normal of the section is |
| A. | ? cos ? |
| B. | ? cos2 ? |
| C. | ? sin ? |
| D. | ? sin2 ? |
| Answer» B. ? cos2 ? | |
| 560. |
Two bars of different materials and same size are subjected to the same tensile force. If the bars have unit elongation in the ratio of 2 : 5, then the ratio of modulus of elasticity of the two materials will be |
| A. | 2 ; 5 |
| B. | 5 ; 2 |
| C. | 4 ; 3 |
| D. | 3 ; 4 |
| Answer» B. 5 ; 2 | |
| 561. |
When a shaft is subjected to torsion, the shear stress induced in the shaft varies from |
| A. | manimum at the centre to maximum at the circumference |
| B. | maximum at the centre to minimum at the circumference |
| C. | zero at the centre to maximum at the circumference |
| D. | maximum at the centre of zero at the circumference |
| Answer» C. zero at the centre to maximum at the circumference | |
| 562. |
Whenever a material is loaded within elastic limit, stress is |
| A. | equal to |
| B. | directly proportional to |
| C. | inversely proportional to |
| Answer» B. directly proportional to | |
| 563. |
A beam supported on more than two supports is called |
| A. | simply supported beam |
| B. | fixed beam |
| C. | overhanging beam |
| D. | continuous beam |
| Answer» D. continuous beam | |
| 564. |
A rectangular beam of length l supported at its two ends carries a central point load W. The maximum deflection occurs |
| A. | at the ends |
| B. | at l / 3 from both ends |
| C. | at the centre |
| D. | none of these |
| Answer» B. at l / 3 from both ends | |
| 565. |
If the diameter of pressure vessel is 15 times the wall thickness, the vessel is said to be a thick shell. |
| A. | Agree |
| B. | Disagree |
| Answer» A. Agree | |
| 566. |
Modulus of resilience is the proof resilience per unit volume of a material. |
| A. | Correct |
| B. | Incorrect |
| Answer» A. Correct | |
| 567. |
A column is said to be a short column, when |
| A. | its length is very small |
| B. | its cross-sectional area is small |
| C. | the ratio of its length to the least radius of gyration is less than 80. |
| D. | the ratio of its length to the least radius of gyration is more than 80. |
| Answer» C. the ratio of its length to the least radius of gyration is less than 80. | |
| 568. |
If there is a fall in the temperature of a composite body, then a member having greater coefficient of linear expansion will be subjected to compressive stress. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 569. |
The Rankine's theory for active earth pressure is based on the assumption that |
| A. | the retained material is homogeneous and cohesionless |
| B. | the frictional resistance between the retaining wall and the retained material is neglected |
| C. | the failure of the retained material takes place along a plane called rupture plane |
| D. | all of the above |
| Answer» D. all of the above | |
| 570. |
The vertical column has two moments of inertia (i.e Ixx and Iyy). The column will tend to buckle in the direction of the |
| A. | axis of load |
| B. | perpendicular to the axis of load |
| C. | maximum moment of inertia |
| D. | minimum moment of inertia |
| Answer» D. minimum moment of inertia | |
| 571. |
The modulus of elasticity for mild steel is approximately equal to |
| A. | 10 kN/mm2 |
| B. | 80 kN/mm2 |
| C. | 100 kN/mm2 |
| D. | 210 kN/mm2 |
| Answer» D. 210 kN/mm2 | |
| 572. |
Two beams, one of circular cross-section and the other of square cross-section, have equal areas of cross-sections. When these beams are subjected to bending. |
| A. | both beams are equally economical |
| B. | square beam is more economical |
| C. | circular beam is more economical |
| D. | none of these |
| Answer» B. square beam is more economical | |
| 573. |
If percentage elongation of a certain specimen made of a material 'A' under tensile test is 30% and the percentage elongation of a specimen with same dimensions made of another material 'B' is 40%, then material 'B' is more ductile than material 'A'. |
| A. | Right |
| B. | Wrong |
| Answer» A. Right | |
| 574. |
Principle plane is a plane on which the shear stress is |
| A. | zero |
| B. | minimum |
| C. | maximum |
| Answer» A. zero | |
| 575. |
If the slenderness ratio for a column is 100, then it is said to be a |
| A. | long |
| B. | medium |
| C. | short |
| Answer» A. long | |
| 576. |
A twisting couple in a shaft induces in the shaft |
| A. | Shear stress |
| B. | Bending moment |
| C. | Deflection |
| D. | All of the above |
| E. | None of the above |
| Answer» A. Shear stress | |
| 577. |
The ratio of hoop stress to longitudinal stress for thin spherical shells is |
| B. | 2 |
| C. | 0 |
| E. | There is no such ratio for spherical shells |
| Answer» E. There is no such ratio for spherical shells | |
| 578. |
An unknown weight falls through 1 cm on a collar rigidly attached to the lower end of a vertical bar 3 m long and 6 m2 in section. If the maximum instantaneous extension is 2 mm the value of stress would be |
| A. | 1500 kg/cm2 |
| B. | 500 kg/cm2 |
| C. | 1000 kg/cm2 |
| D. | 1333 kg/cm2 |
| E. | 667 kg/cm2 |
| Answer» D. 1333 kg/cm2 | |
| 579. |
The neutral axis of a transverse section of a beam passes through the centre of gravity of the section and is |
| A. | At right angles to the plane in which the beam bends |
| B. | In the same plane in which beam bends |
| C. | In the vertical plane |
| D. | In the horizontal plane |
| E. | None of the above |
| Answer» A. At right angles to the plane in which the beam bends | |
| 580. |
The local strain energy at a point in a material when shear stress is 80 MN/m2 and G = 27 GN/m2 will be nearly |
| A. | 58.5 kJ/m3 |
| B. | 118.5 kJ/m3 |
| C. | 438.5 kJ/m3 |
| D. | 2348 kJ/m2 |
| E. | None of the above |
| Answer» B. 118.5 kJ/m3 | |
| 581. |
If shear force is zero along a section, the bending moment at that section will be |
| A. | Minimum |
| B. | Maximum |
| C. | There is no correlation between the two |
| D. | Minimum or Maximum |
| E. | Zero |
| Answer» D. Minimum or Maximum | |
| 582. |
The rod of a ceiling fan is subjected to |
| A. | compressive stress |
| B. | tensile stress |
| C. | shear stress |
| D. | torsional stress |
| E. | None of the above |
| Answer» B. tensile stress | |
| 583. |
The compression members tend to buckle in the direction of their |
| 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» D. Least radius of gyration | |
| 584. |
The percentage reduction of area during tensile test on a cast iron specimen may be |
| A. | Negligible |
| B. | 25% |
| C. | 50% |
| D. | 5% |
| E. | 10% |
| Answer» A. Negligible | |
| 585. |
The web bukling in beams may be avoided by |
| A. | stiffening the web |
| B. | limiting the stress that can be used |
| C. | increasing the span |
| D. | any of the above methods |
| E. | None of the above |
| Answer» A. stiffening the web | |
| 586. |
If the rod in problem 165 stands erected vertically upwards then it will be known as |
| A. | Short column |
| B. | Strut |
| C. | Long column |
| D. | Medium column |
| E. | None of the above |
| Answer» C. Long column | |
| 587. |
Which of the following materials can be used for absorption of shock? |
| A. | Rubber |
| B. | Wood |
| C. | sawdust |
| D. | Lead sheet |
| E. | Any of the above |
| Answer» E. Any of the above | |
| 588. |
In a compression test the fracture in cast iron specimen would occur along |
| A. | An oblique plane |
| B. | Along the axis of load |
| C. | A light angles to the specimen axis |
| D. | Fracture will not occur in cast iron |
| E. | None of the above |
| Answer» A. An oblique plane | |
| 589. |
Shear stresses on mutually perpendicular planes are |
| A. | Equal |
| B. | Maximum |
| C. | Minimum |
| D. | Zero |
| E. | Unequal |
| Answer» A. Equal | |
| 590. |
The weakness section of a diamond riveting is the section which passes through |
| A. | End row with one rivet only |
| B. | Row with maximum rivets |
| C. | All rows have same strength |
| D. | The first row |
| E. | Middle row |
| Answer» A. End row with one rivet only | |
| 591. |
A 10 mm mild steel rod 40 min long lying on ground will be known as |
| A. | Short column |
| B. | Long column |
| C. | Strut |
| D. | Medium column |
| E. | None of the above |
| Answer» E. None of the above | |
| 592. |
Torsional rigidity is |
| A. | The torque that produces rotation of unit r.p.m. in a shaft |
| B. | The torque that transmits one HP at one r.p.m. |
| C. | The torque that produces a twist of one radian in a shaft of unit diameter |
| D. | The torque that produces a twist of one radian in a shaft of unit length |
| E. | None of the above |
| Answer» D. The torque that produces a twist of one radian in a shaft of unit length | |
| 593. |
A portion of a beam between two sections is said to be in pure bending when there is |
| A. | constant bending moment and constant shear force |
| B. | constant shear force and zero bending mement |
| C. | constant bending moment and zero shear force |
| D. | zero bending moment and zero shear force |
| E. | None of the above |
| Answer» C. constant bending moment and zero shear force | |
| 594. |
A self-supporting steel chimney transmits the lateral forces to the foundation by |
| A. | propped beam action |
| B. | cantilever action |
| C. | simply supported beam action |
| D. | fixed beam action |
| E. | None of the above |
| Answer» B. cantilever action | |
| 595. |
The moment of inertia of an area will be least with respect to |
| A. | Vertical axis |
| B. | Moment of area does not depend on axes |
| C. | Moment of area is same through all axes |
| D. | Central axis |
| E. | Horizontal axis |
| Answer» D. Central axis | |
| 596. |
A hole, one metre from the end of a structural steel member, is 0.8 mm shy of matching another hole for possible connection. What force, in kN, is necessary to stretch it for connection? The cross section is 25 mm x 3 mm |
| A. | 12.6 |
| B. | 13.6 |
| C. | 14.7 |
| D. | 15.8 |
| E. | None of the above |
| Answer» A. 12.6 | |
| 597. |
Two rods A and B are subjectd to equal load P. Rod A is tapering with bigger diameter D at the support and small end diameter as D/2. Rod B is of uniform cross section with diameter D. The ratio of elongation of rod A to that of B would be |
| A. | 4 |
| B. | 2 |
| C. | 1 |
| E. | None of the above |
| Answer» B. 2 | |
| 598. |
A beam supporting a uniformly distributed load over its entire length L is pinned at one end and passes over a roller support at a distance x from the other end. The value of x such that the greatest bending moment in the beam is as small as possible, will be |
| A. | 0.111 L |
| B. | 0.2 L |
| C. | 0.125 L |
| D. | 0.33 L |
| E. | 0.293 L |
| Answer» E. 0.293 L | |
| 599. |
Hoop stress is |
| A. | Circumferential tensile stress |
| B. | Compressive stress |
| C. | Radial stress |
| D. | Longitudinal stress |
| E. | None of the above |
| Answer» A. Circumferential tensile stress | |
| 600. |
A composite spring is made by joining two springs end to end one spring having twice the stiffness of the other. The ratio of the stiffness of the composite spring to that of the stiffness of the two springs could be |
| A. | ? |
| B. | 2 |
| C. | 3 |
| D. | 3?2 |
| E. | ? |
| Answer» E. ? | |
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