McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 651. |
A beam simply supported at ends is subjected to load. The point of contraflexure is located where |
| A. | Bending moment is zero |
| B. | Shear force is maximum |
| C. | Shear force is zero |
| D. | At the middle of the longer side |
| E. | Axial thrust is zero |
| Answer» A. Bending moment is zero | |
| 652. |
Which section is normally preferred for an eccentrically loaded strut? |
| A. | Solid |
| B. | Hollow |
| C. | Composite |
| D. | Reinforced |
| E. | Any of the above |
| Answer» C. Composite | |
| 653. |
The point of contraflexural can exist in a |
| A. | Simply supported beams only |
| B. | Cantilever |
| C. | Beam with overhangs but without any load on the overhanging sections |
| D. | Beam fixed at both ends |
| E. | All of the above |
| Answer» D. Beam fixed at both ends | |
| 654. |
Two shafts are made of mild steel one having circular cross-section and the other shaft is hollow circular with inner diameter half of the outer diameter. The ratio of the torque that can be transmitted in two cases will be |
| A. | 17/16 |
| B. | 15/16 |
| C. | 7?8 |
| D. | 2 |
| E. | 1 |
| Answer» B. 15/16 | |
| 655. |
If a rectangular shaft is subjected to torsion, the maximum sher stress will occur |
| A. | Along the diagonal |
| B. | At the comers |
| C. | At the middle of the small side |
| D. | At the centre |
| E. | At the middle of the longer side |
| Answer» E. At the middle of the longer side | |
| 656. |
A continuous beam is |
| A. | One which is constrained at both ends |
| B. | One resting upon several supports |
| C. | One which is part of a system consisting of a number of beams |
| D. | One which is very long as compared to width of beam |
| E. | None of the above |
| Answer» B. One resting upon several supports | |
| 657. |
In a beam where shear force is maximum the bending moment will be |
| A. | Maximum |
| B. | Zero |
| C. | Minimum |
| D. | There is no such relation between the two |
| E. | None of the above |
| Answer» A. Maximum | |
| 658. |
Principal strains occur on three planes which are |
| A. | mutually perpendicular to each other |
| B. | arbitrary in nature |
| C. | inclined to one another at 45? |
| D. | None of the above |
| E. | None of the above |
| Answer» A. mutually perpendicular to each other | |
| 659. |
The effective length of a column effectively held in position and restrained in direction at one end but not held in position or restrained in direction at the other end would be |
| A. | 0.67 L |
| B. | 2 L |
| C. | 0.85 L |
| D. | L |
| E. | 1.5 L |
| Answer» C. 0.85 L | |
| 660. |
A shaft running at 300 rpm is required to transmit 300 horse power. The working stress in shear is 420 kg/cm2. The diameter of the shaft whould be in the range |
| A. | 1 cm to 2 cm |
| B. | 3 cm to 4 cm |
| C. | 2 cm to 3 cm |
| D. | 4 cm to 5 cm |
| E. | 7 cm to 9.7 cm |
| Answer» E. 7 cm to 9.7 cm | |
| 661. |
Deflection the point of application of an external force acting on a beam is equal to the partial derivation of the work of deformation with respect to this force |
| A. | Rankine's theorem |
| B. | Mohr's hypothesis |
| C. | Castigliano's theorem |
| D. | Maxwell's theorem |
| E. | None of the above |
| Answer» C. Castigliano's theorem | |
| 662. |
A uniform beam of effective length L, fixed at one end and loaded uniformly will have maximum deflection at |
| A. | 5/8 L from free end |
| B. | 7/8 L from fixed end |
| C. | Between CD |
| D. | At free end |
| E. | 3/8 L from free end |
| Answer» E. 3/8 L from free end | |
| 663. |
Under uniaxial strain, the ratio of maximum shearing strain to uniaxial strain is |
| A. | 2 |
| B. | 1.5 |
| C. | 1 |
| D. | 0.5 |
| E. | None of the above |
| Answer» D. 0.5 | |
| 664. |
Three pieces of wood having 3.75 cm x 3.75 cm square cross-sections are glued together and to the foundation. If the horizontal force P = 600 kg is applie3d to the central piece, the average shearing stress in each of the glued joints would be |
| A. | 20 kg/cm2 |
| B. | 40 kg/cm2 |
| C. | 80 kg/cm2 |
| D. | 430 kg/cm2 |
| E. | 860 kg/cm2 |
| Answer» A. 20 kg/cm2 | |
| 665. |
During suddenly applied impact loading the stress developed to gradually applied load is |
| A. | 4 times |
| B. | ?2 time |
| C. | 1.5 times |
| D. | 1 |
| E. | 2 times |
| Answer» E. 2 times | |
| 666. |
Rivets are made of |
| A. | Ductile material |
| B. | Hard material |
| C. | Brittle material |
| D. | Malleable material |
| E. | Tough material |
| Answer» A. Ductile material | |
| 667. |
A beam of uniform strength will have at every cross-section |
| A. | same deflection |
| B. | same stiffuess |
| C. | same bending moment |
| D. | same bending stress |
| E. | None of the above |
| Answer» D. same bending stress | |
| 668. |
A solid steel shaft of 100 mm diameter transmits 100 HP at (450/?) r.p.m. The torque in kg-m on the shaft would be |
| A. | 500 |
| B. | 750 |
| C. | 1000 |
| D. | 5000 |
| E. | 250 |
| Answer» A. 500 | |
| 669. |
Principal plane has |
| A. | No shear stress |
| B. | Maximum compressive stress |
| C. | No compressive stress |
| D. | Maximum shear stress |
| E. | Maximum tensile stress |
| Answer» D. Maximum shear stress | |
| 670. |
A vessel is said to be thin walled, when |
| A. | The vessel is made of thin sheets |
| B. | The vessel wall thickness is less than 1 mm |
| C. | The vessel wall thickness is equal to or less than 1/20 of the internal diameter of the vessel |
| D. | The vessel wall thickness is equal to or less than 1/10 of the internal diameter of the above |
| E. | None of the above |
| Answer» C. The vessel wall thickness is equal to or less than 1/20 of the internal diameter of the vessel | |
| 671. |
Strain is |
| A. | The change in metals |
| B. | The change in shape and direction in metal |
| C. | The result of load application on a body |
| D. | The change of form produced in a piece by the action of load |
| E. | None of the above |
| Answer» D. The change of form produced in a piece by the action of load | |
| 672. |
The shape of steel chimneys commonly used is |
| A. | Square |
| B. | Circular |
| C. | Octagonal |
| D. | Elliptical |
| E. | None of the above |
| Answer» B. Circular | |
| 673. |
An axial hoad is applied on a circular section of diameter D. If the same load is applied on hollow circular section with inner diameter D/2, the ratio of stress in two cases would be |
| A. | 4 |
| B. | 3?4 |
| C. | 4?3 |
| E. | 1 |
| Answer» B. 3?4 | |
| 674. |
The loss of strength in compression due to overloading is known as |
| A. | Relaxation |
| B. | Creep |
| C. | Hysteresis |
| D. | Bauschinger effect |
| E. | Resilience |
| Answer» D. Bauschinger effect | |
| 675. |
When a rectangular beam is loaded longitudinally, shear stress develops on |
| A. | Vertical planes only |
| B. | Top fibre |
| C. | Middle fibre |
| D. | Every fibre |
| E. | Bottom fibre |
| Answer» D. Every fibre | |
| 676. |
A circular section of steel 20 mm diameter is subjected to an axial force of 100 kg. The components of force normal and tangential to a plane inclined to the axis of bar will be |
| A. | 54 kg |
| B. | 70.7 kg |
| C. | 100 kg |
| D. | 141 kg |
| E. | 80 kg |
| Answer» B. 70.7 kg | |
| 677. |
In the case of biaxial state of normal stresses, the normal stress on 45? plane is equal to |
| A. | the sum of the normal stresses |
| B. | the difference of the normal stresses |
| C. | half the sum of the normal stress |
| D. | half the difference of normal stresses |
| E. | None of the above |
| Answer» C. half the sum of the normal stress | |
| 678. |
An axial load P is applied on a circular section of diameter D. If the same load is applied on a hollow circular shaft with inner diameter as D/2, the ratio of stress in two cases would be |
| A. | 3?4 |
| B. | 8?3 |
| C. | 4?3 |
| D. | 9?8 |
| E. | 1 |
| Answer» B. 8?3 | |
| 679. |
A copper rod 15 mm diameter 0.8 m long is heated through 50?C. The expansion of the rod is prevented by gripping it at both ends. When the grips do not yield, the stress in rod is 115 N/mm2 and forces applied at the grips are 20 kN. In case one of the grip yields by 0.5 mm |
| A. | the rod will be under tension |
| B. | the force at grips will be increase |
| C. | the compressive stress in the rod will increase |
| D. | the compressive stress in the rod will reduce |
| E. | None of the above |
| Answer» D. the compressive stress in the rod will reduce | |
| 680. |
Approximate horse power that can be transmitted by a shaft 60 mm dimeter at 180 rpm with permissible shear stress of 850 kg/cm2 would be |
| A. | 30 - 35 |
| B. | 35 - 50 |
| C. | 60 - 85 |
| D. | 85 - 95 |
| E. | 50 - 60 |
| Answer» D. 85 - 95 | |
| 681. |
The efficiency of a riveted joint is defined as the ratio of actual strength of the joint to that of solid plate. In this strength of the joint is considered in |
| A. | Tension |
| B. | Compression (bearing) |
| C. | Shear |
| D. | Least of (A), (B) and (C) above |
| E. | None of the above |
| Answer» D. Least of (A), (B) and (C) above | |
| 682. |
A rectangular beam 200 mm deep by 100 mm wide-subjected to maximum bending moment of 500 kNm. The maximum stress in the beam will be |
| A. | 250 N/mm2 |
| B. | 500 N/mm2 |
| C. | 750 N/mm2 |
| D. | 1500 N/mm2 |
| E. | None of the above |
| Answer» C. 750 N/mm2 | |
| 683. |
For a given stress the ratio of moment of resistance of a square beam with its side horizontal compared to when the diagonal is horizontal is |
| A. | 1.5 |
| B. | ?2 |
| C. | 1.2 |
| D. | 2 |
| E. | depends on external load and moment of inertia |
| Answer» B. ?2 | |
| 684. |
A prismatic steel bar 25 cm long is subjected to axial compressive force of 2000 kg. For steel E = 2 x 106 kg/cm2. The ratio of strain energy when the cross-sectional area is 25 sq. cm to that when the cross-section area is 12.5 sq cm, would be |
| A. | 0.5 |
| B. | 1 |
| C. | 0.25 |
| D. | 2 |
| E. | 4 |
| Answer» C. 0.25 | |
| 685. |
In laminated spring the strips are provided in different lengths for |
| A. | Space consideration of the utility stage |
| B. | Reducing the weight |
| C. | Equal distribution of stress |
| D. | Material economy |
| E. | Improved sppearance |
| Answer» C. Equal distribution of stress | |
| 686. |
The modulus of resilience in shear is nearly |
| A. | 380 kJ/m3 |
| B. | 260 kJ/m3 |
| C. | 150 kJ/m3 |
| D. | 95 kJ/m3 |
| E. | None of the above |
| Answer» A. 380 kJ/m3 | |
| 687. |
The numerical values of Young's modulus of elasticity in descending order for wood, lead, glass, steel and phospor brouze is given by |
| A. | Steel, Wood, Lead Phosphor-bronze, Glass |
| B. | Steel, Glass, Phosphor-bronze, Lead Wood |
| C. | Steel, Phosphor-bronze, Glass, Lead and Wood |
| D. | Steel, Lead, Wood, Phosphor-bronze, Glass |
| E. | Steel, Phosphor-bronze, Wood, Glass, Lead |
| Answer» C. Steel, Phosphor-bronze, Glass, Lead and Wood | |
| 688. |
The damping capacity of a material is its capacity to |
| A. | Provide rigid joints |
| B. | Neutralise torsional stress |
| C. | Absorb shocks and vibrations |
| D. | Absorb noise |
| E. | Withstand shear stress |
| Answer» C. Absorb shocks and vibrations | |
| 689. |
A section is subjected to reversal of stress. Choice exists for selecting any of the following section. Which one should be selected? |
| A. | Hollow pipe |
| B. | Equal angle iron |
| C. | Unequal angle iron |
| D. | T-section |
| E. | None of the above |
| Answer» A. Hollow pipe | |
| 690. |
The diameter of corresponding Mohr circle will represent |
| A. | 80 MPa |
| B. | 50 MPa |
| C. | 30 MPa |
| D. | 20 MPa |
| E. | None of the above |
| Answer» D. 20 MPa | |
| 691. |
For a beam of length L fixed at one end, supported at the other and loaded W at the centre C the maximum bending moment with occur at |
| A. | Simply supported end |
| B. | Between supported end and centre |
| C. | Between fixed end and centre |
| D. | Centre |
| E. | Fixed end |
| Answer» E. Fixed end | |
| 692. |
In SI units, one bar is equal to |
| A. | 0.1 N/mm2 |
| B. | 1.0 N/mm2 |
| C. | 1.0 N/cm2 |
| D. | 10.0 N/m2 |
| E. | None of the above |
| Answer» A. 0.1 N/mm2 | |
| 693. |
The instrument used for the measurement of expansion and contraction due to change in temperature, is known as |
| A. | Dilatometer |
| B. | Bolometer |
| C. | Padometer |
| D. | Tellurometer |
| E. | None of the above |
| Answer» A. Dilatometer | |
| 694. |
A piece of steel plate is subjected to perpendicular stresses of 50 Mpa and 30 Mpa both tensile. The normal stress is |
| A. | 8.6 MPa |
| B. | 14.4 MPa |
| C. | 26.6 MPa |
| D. | 48.4 MPa |
| E. | None of the above |
| Answer» A. 8.6 MPa | |
| 695. |
In case of thin walled cylinders the ratio of hoop stress to maximum shear stress stress is |
| A. | 2 |
| C. | 4 |
| E. | None of the above |
| Answer» C. 4 | |
| 696. |
Highest factor of safety is usually taken for |
| A. | dead |
| B. | live load |
| C. | shock load |
| E. | None of the above |
| Answer» C. shock load | |
| 697. |
The bending moment diagram in case of a cantilever beam carrying a linearly varying load from zero at free end to maximum at supported end will be a |
| A. | Cubic parabola |
| B. | Inverse hyperbola |
| C. | Traingle |
| D. | Parabola |
| E. | Rectangle |
| Answer» A. Cubic parabola | |
| 698. |
The ratio of stress produced by suddenly applied load to that produced by the same load when gradually applied is |
| A. | 4 |
| C. | 1 |
| D. | 2 |
| E. | The maximum energy stored at elastic limit per unit volume. |
| Answer» D. 2 | |
| 699. |
While evaluating the strength of riveted joint in shearing, bearing or tension the calculations are based on |
| A. | Actual size of rivet |
| B. | Actual size of hole drilled for the rivet |
| C. | Mean of the size of hole and drilled hole |
| D. | Smaller of the two holes |
| E. | None of the above |
| Answer» B. Actual size of hole drilled for the rivet | |
| 700. |
The modulus of rigidity is defined as |
| A. | The ratio of true stress to true strain |
| B. | The ratio of shear stress to shear strain |
| C. | The ratio of longitudinal stress to longitudinal strain |
| D. | The ratio of twisting moment to cross-sectional area |
| E. | None of the above |
| Answer» B. The ratio of shear stress to shear strain | |
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