McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 751. |
If the rivet value is 2000 N and the force in the member is 2000 N, the number of rivets required for the connection of the member to a gusset plate is |
| A. | 1 |
| B. | 2 |
| C. | 4 |
| D. | 8 |
| E. | None of the above |
| Answer» B. 2 | |
| 752. |
A material which recovers fully after unloading but not instantaneously is known as |
| A. | Elastic |
| B. | Partially elastic |
| C. | Anelastic |
| D. | Inelastic |
| E. | Plastic |
| Answer» C. Anelastic | |
| 753. |
If Young's modulus of elasticity is determined for mild steel in tension and compression, the two values will have a ratio (Et/Er) of |
| A. | Rhombus |
| B. | 0.5 |
| C. | 1.2 |
| D. | 1 |
| E. | 2 |
| Answer» D. 1 | |
| 754. |
Clad metals are |
| A. | Non-ferrous materials |
| B. | Two or more dissimilar materials riveted together |
| C. | Two or more dissimilar materials joined together by welding |
| D. | Two or more dissimilar materials jointed together under very high hydraulic pressure |
| E. | None of the above |
| Answer» D. Two or more dissimilar materials jointed together under very high hydraulic pressure | |
| 755. |
Two bars of sifferent materials are of the same size and are subjected to same tensile forces. If the bars have unit elongation in the ratio of 7 : 3, then the ratio of modulii of elasticity of the two materials is |
| A. | 8 ; 3 |
| B. | 3 ; 8 |
| C. | 64 ; 9 |
| D. | 9 ; 64 |
| E. | None of the above |
| Answer» A. 8 ; 3 | |
| 756. |
A square steel bar 20 mm on a side is subjected to an axial compressive load of 8 kN. The normal stress acting on plane 30? to the line action of the axial load will be |
| A. | 0.5 N/mm2 |
| B. | 2.5 N/mm2 |
| C. | 50 N/mm2 |
| D. | 550 N/mm2 |
| E. | None of the above |
| Answer» A. 0.5 N/mm2 | |
| 757. |
Hooke's Law is valid within the limits of proportionality. The limit of proportionality depends on |
| A. | type of loading |
| B. | area of cross-section |
| C. | type of material |
| D. | hardness of material |
| E. | None of the above |
| Answer» C. type of material | |
| 758. |
In case of thin walled cylinders the ratio of hoop stress to radial stress is |
| A. | 2 |
| C. | 4 |
| E. | None of the above |
| Answer» E. None of the above | |
| 759. |
Strain rosettes are generally used for |
| A. | Measurement of resilience |
| B. | Measurement of proof stress |
| C. | Measurement of shear strain |
| D. | Measurement of longitudinal strains |
| E. | Measurement of load |
| Answer» D. Measurement of longitudinal strains | |
| 760. |
When a strip made of iron and copper is heated |
| A. | It bends |
| B. | It gets twisted |
| C. | Iron bends on convex side |
| D. | Iron bends on concave side |
| E. | None of the above |
| Answer» D. Iron bends on concave side | |
| 761. |
The ratio of maximum shear stress to average shear stress in case of a circular beam transmitting power is equal to |
| A. | 3?4 |
| B. | 5?4 |
| C. | 2?5 |
| D. | 4?3 |
| E. | 4?5 |
| Answer» D. 4?3 | |
| 762. |
In case the modulus of elasticity for a material is 200 GN/m2 and Poisson's ratio is 0.25, the modulus of rigidity is |
| A. | 250 GN/m2 |
| B. | 125 GN/m2 |
| C. | 80 GN/m2 |
| D. | 320 GN/m2 |
| E. | None of the above |
| Answer» C. 80 GN/m2 | |
| 763. |
The ratio of maximum shear stress to the average shear stress in a rectangular beam subjected to torsion is |
| A. | 4?5 |
| B. | 5?4 |
| C. | 3?4 |
| D. | 3?2 |
| E. | 2?3 |
| Answer» D. 3?2 | |
| 764. |
The safe value of stress under which a member subjected to reversible tensile or compressive stress will not fail is known as |
| A. | Safe stress |
| B. | Fatigue stress |
| C. | Endurance limit |
| D. | Proof stress |
| E. | Elastic limit stress |
| Answer» C. Endurance limit | |
| 765. |
When a member is subjected to axial tensile load, the greatest normal stress is equal to |
| A. | half the maximum shear stress |
| B. | maximum shear stress |
| C. | twice the maximum shear stress |
| D. | four times the maximum shear stress |
| E. | None of the above |
| Answer» C. twice the maximum shear stress | |
| 766. |
If the load at the free end of a cantilever beam is increased, the failure will occur |
| A. | Any where between free end and centre |
| B. | At the centre |
| C. | At the free and |
| D. | At the support |
| E. | Any where between free end and support |
| Answer» D. At the support | |
| 767. |
Moment area method is useful determining the following in a beam |
| A. | slope and deflection at point |
| B. | Shear force and bending moment at a point |
| C. | tensile and compressive stresses at a point |
| D. | None of the above |
| E. | None of the above |
| Answer» A. slope and deflection at point | |
| 768. |
According to Rankine's theory of failure, elastic failure occurs |
| A. | When the minor principal stress is equal to the elastic limits value in a simple tension test |
| B. | When the greatest principal stress reaches the elastic limit value in simple tension test |
| C. | When the greatest principal stress is equal to the stress corresponding to the upper yield limit in a tension test |
| D. | None of the above |
| E. | None of the above |
| Answer» B. When the greatest principal stress reaches the elastic limit value in simple tension test | |
| 769. |
For a beam of length L fixed at end A and simply supported at end B and loaded uniformly by a load W the maximum bending moment will occur at |
| A. | Centre C |
| B. | B |
| C. | A |
| D. | Between AC |
| E. | Between CD |
| Answer» C. A | |
| 770. |
Necking in case of ductile materials begins at the |
| A. | elastic limit point |
| B. | upper yield point |
| C. | lower yield point |
| D. | ultimate point |
| E. | None of the above |
| Answer» D. ultimate point | |
| 771. |
The ratio of average shear stress to maximum shear stress for a circular section is |
| A. | 3?2 |
| B. | 2?3 |
| C. | 4?3 |
| D. | 2 |
| E. | 3?4 |
| Answer» E. 3?4 | |
| 772. |
The bending moment diagram for a cantilever beam subjected to bending moment at the end of the beam would be |
| A. | Rectangle |
| B. | Triangle |
| C. | Parabola |
| D. | Cubic parabola |
| E. | None of the above |
| Answer» A. Rectangle | |
| 773. |
For which of following material the value of Poissons ratio is more than 1? |
| A. | Cork |
| B. | Dead mild steel |
| C. | Wood |
| D. | Plastic |
| E. | None of the above |
| Answer» E. None of the above | |
| 774. |
The strain energy of the spring when it is subjected to the greatest load which the spring can carry without suffering permanent distortion is known as |
| A. | Proof strain energy |
| B. | Proof load stress |
| C. | Proof resilience |
| D. | Proof stress |
| E. | Limiting stress |
| Answer» C. Proof resilience | |
| 775. |
The deformation of any structure takes place in such a manner that the work of deformation is a minimum. This is known as |
| A. | Principle of least work |
| B. | Law of minimum energy |
| C. | Law of conservation of energy |
| D. | Principle of failure of structure |
| E. | None of the above |
| Answer» A. Principle of least work | |
| 776. |
A cantilever beam rectangular in cross-section is subbjected to a load W at its free end. If the depth of the beam is doubled and the load is halved, the deflection of the free end as compared to original deflection will be |
| A. | Double |
| B. | One-sixteenth |
| C. | Eight times |
| D. | One eight |
| E. | Half |
| Answer» B. One-sixteenth | |
| 777. |
The neutral axis of a simply supported beam is |
| A. | Where fibres are subjected to maximum compression |
| B. | Where fibres do not undergo strain |
| C. | Where fibres are subjected to maximum bending stress |
| D. | When fibres are subjected to minimum bending stress |
| E. | Where fibres undergo maximum strain |
| Answer» B. Where fibres do not undergo strain | |
| 778. |
The point of contraflexure occurs in |
| A. | All types of beams |
| B. | Continuous beam only |
| C. | Simply supported beams only |
| D. | Cantilever beams only |
| E. | Overhanging beams only |
| Answer» E. Overhanging beams only | |
| 779. |
A short, hollow cast iron cylinder with a wall thickness of 1 cm is to carry a compressive load of 10 tonnes. If the working stress in compression is 800 kg/cm2, the outside diameter of the cylinder should not be less than |
| A. | 0.5 cm |
| B. | 1.0 cm |
| C. | 4.5 cm |
| D. | 2.5 cm |
| E. | 5 cm |
| Answer» E. 5 cm | |
| 780. |
In case of thin cylindrical shell with hemispherical ends |
| A. | The thickness of cylindrical is more than that of spherical ends |
| B. | The thickness of cylinderical shell is less than that of spherical ends |
| C. | The thickness of cylindrical is same as that of spherical ends |
| D. | The thickness of cylindrical shell is double of the thickness of spherical shell |
| E. | None of the above |
| Answer» A. The thickness of cylindrical is more than that of spherical ends | |
| 781. |
The amount of resilience is equal to |
| A. | The work required to deform the body zero stress to stress within elastic limit |
| B. | Elastic energy stored in unit area of material |
| C. | Equal to the area of the stress deformation diagram |
| D. | None of the above |
| E. | None of the above |
| Answer» A. The work required to deform the body zero stress to stress within elastic limit | |
| 782. |
A strip of steel 75 mm wide 40 mm thick is bent round a circular drum of 4.96 m outside diameter. If E = 2 x 105 N/mm2, the maximum stress due to bending will be |
| A. | 1600 N/mm2 |
| B. | 1200 N/mm2 |
| C. | 800 N/mm2 |
| D. | 400 N/mm2 |
| E. | None of the above |
| Answer» A. 1600 N/mm2 | |
| 783. |
A pressure vessel is said to be thin walled when the ratio of internal diameter of the vessel and wall thickness is |
| A. | More than 20 |
| B. | 5 |
| C. | There is no such relationship |
| D. | 15 |
| E. | 10 |
| Answer» A. More than 20 | |
| 784. |
For a beam of uniform strength if its depth is maintained constant, then its width will vary in proportion to |
| A. | Bending Moment, BM |
| B. | (BM)2 |
| C. | (BM) |
| D. | (BM)3 |
| E. | None of the above |
| Answer» A. Bending Moment, BM | |
| 785. |
Two beams carrying identical loads simply supported are having same width but beam A has double the depth as compared to that of beam B. The ratio of elastic strength of neam A compared to that of B will be |
| A. | 2 |
| C. | ? |
| D. | 4 |
| E. | 8 |
| Answer» D. 4 | |
| 786. |
Force required to punch a 15 mm hole in a mild steel pipe 5 mm thick, when ultimate shear stress of the plate is 500 N/mm2, will be nearly |
| A. | 78 kN |
| B. | 98 kN |
| C. | 118 kN |
| D. | 158 kN |
| E. | None of the above |
| Answer» C. 118 kN | |
| 787. |
A cantilever beam of length 5 m carries a uniformly distributed load of 100 Newtons/m throughout its length. The maximum shearing force in the beam will be |
| A. | 100 N |
| B. | 250 N |
| C. | 500 N |
| D. | 1250 N |
| E. | None of the above |
| Answer» C. 500 N | |
| 788. |
The limit within which Hooke's law holds good is known as |
| A. | Elastic limit |
| B. | Plastic limit |
| C. | Yield point |
| D. | Eulers limit |
| E. | None of the above |
| Answer» A. Elastic limit | |
| 789. |
The theory of failure considered appropriate for ductile materials is |
| A. | Rankines theory |
| B. | Beltrami's theory |
| C. | St. Venant theory |
| D. | Von Mises theory. |
| E. | None of the above |
| Answer» D. Von Mises theory. | |
| 790. |
A bronze specimen has modulus of elasticity 1.2 x 105 N/mm2 and modulus of rigidity 4.7 x 104 N/mm2. The Poisson's ratio of the material will be |
| A. | 0.196 |
| B. | 0.276 |
| C. | 0.45 |
| D. | 0.471 |
| E. | None of the above |
| Answer» B. 0.276 | |
| 791. |
The intensity of wind pressure is taken as |
| A. | directly proportinal to wind velocity |
| B. | universely proportional to wind velocity |
| C. | directly proportional to square of wind velocity |
| D. | inversely proportional to square of wind velocity |
| E. | None of the above |
| Answer» C. directly proportional to square of wind velocity | |
| 792. |
Which of the following statement is incorrect? |
| A. | At a hinge in a beam there is no bending moment but there is shear force |
| B. | In case of inclined loads horizontal components cause thrust in the beam |
| C. | Bending moment is maximum at a point where shear force is zero or where it changes deflection from positive to negative or vice versa |
| D. | The point where shear force is zero is known as the point of contraflexure |
| E. | None of the above |
| Answer» E. None of the above | |
| 793. |
A thin cylinder contains fluid at a pressure of 30 kg/cm2, the inside 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 minimum wall thickness of |
| A. | 1000 mm |
| B. | 1 mm |
| C. | 2.7 mm |
| D. | 10 mm |
| E. | 9 mm |
| Answer» D. 10 mm | |
| 794. |
A tower subjected to load W has self-weight 2W. It is to be designed for constant compressive stress at all sections. The cross-section of the tower should have |
| A. | Tapering section |
| B. | Circular section |
| C. | Parabolic section |
| D. | Hyperbolic section |
| E. | None of the above |
| Answer» E. None of the above | |
| 795. |
The Young's modulus of elasticity of a material is twice its modulus of rigidity. The Poisson's ratio for the material will be |
| A. | Zero |
| B. | 0.5 |
| C. | 1 |
| D. | None of the above |
| E. | None of the above |
| Answer» A. Zero | |
| 796. |
Web crippling occurs due to |
| A. | column action of the web |
| B. | failure of web under concentrated load |
| C. | excessive bending moment |
| D. | secondary stresses |
| E. | None of the above |
| Answer» B. failure of web under concentrated load | |
| 797. |
The light gauge steel structural members are usually |
| A. | hot rolled |
| B. | cold rolled |
| C. | casted |
| D. | riveted |
| E. | None of the above |
| Answer» B. cold rolled | |
| 798. |
Static loading of a specimen |
| A. | Is done in steps |
| B. | Is done by continuously increasing the work load |
| C. | Is done by applying load in a short period during specified intervals |
| D. | Is done by applying the load slowly enough so that all parts of the specimen are in equilibrium at any instant |
| E. | None of the above |
| Answer» D. Is done by applying the load slowly enough so that all parts of the specimen are in equilibrium at any instant | |
| 799. |
A beam fixed at both ends with a central load W in the middle will have zero bending moment as |
| A. | One place |
| B. | No where |
| C. | Three places |
| D. | Four places |
| E. | Two places |
| Answer» E. Two places | |
| 800. |
A body is subjected to two normal stresses of 200 kN/m2 (tensile) and 100 kN/m2 (compressive) acting mutually perpendicular to each other. The maximum sher stress is equal to |
| A. | 50 kN/m2 |
| B. | 100 kN/m2 |
| C. | 150 kN/m2 |
| D. | 300 kN/m2 |
| E. | None of the above |
| Answer» C. 150 kN/m2 | |
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