McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 701. |
The elongation of a conical bar under its own weight is equal to |
| A. | that of a prismatic bar of the same length |
| B. | one third that of a prismatic bar of the same length |
| C. | One fourth that of a prismatic bar of the same length |
| D. | one sixth that of a prismatic bar of the same length |
| E. | None of the above |
| Answer» B. one third that of a prismatic bar of the same length | |
| 702. |
A propped cantilever is indeterminate externally to |
| A. | the second degree |
| B. | the third degree |
| C. | the fourth degree |
| D. | None of the above |
| E. | None of the above |
| Answer» A. the second degree | |
| 703. |
Secondary stresses may be set up in a frame due to any of the following reasons EXCEPT |
| A. | rigidity of the members |
| B. | ecentricity of connections |
| C. | self-weight of the members |
| D. | members not being straight |
| E. | None of the above |
| Answer» A. rigidity of the members | |
| 704. |
Which of the following is dimensionless? |
| A. | Coefficient of linear expansion |
| B. | Thermal stress |
| C. | Strain |
| D. | Bulk modulus |
| E. | Shear stress |
| Answer» C. Strain | |
| 705. |
Diamond riveting is generally used for |
| A. | Butt joints |
| B. | Lap joints |
| C. | Revised joints for dissimilar materials |
| D. | Riveted joints for materials of different thickness |
| E. | None of the above |
| Answer» A. Butt joints | |
| 706. |
When a number of loads rest upon a beam, dflection at any point is equal to the sum of the deflections at the point due to each of the loads taken separately. This statement is known as |
| A. | Rankine's theorem |
| B. | Mohr's hypothesis |
| C. | Maxwell's theorem |
| D. | Castigliano's theorem |
| E. | None of the above |
| Answer» E. None of the above | |
| 707. |
The rate of change of bending moment is equal to |
| A. | Shear force |
| B. | Deflection |
| C. | Slope |
| D. | Poisson's ratio x deflection |
| E. | None of the above |
| Answer» A. Shear force | |
| 708. |
Shear stress on principal planes is |
| A. | maximum |
| B. | minimum |
| C. | zero |
| D. | None of the above |
| E. | None of the above |
| Answer» C. zero | |
| 709. |
The closed-coiled helical springs are made from the same small diameter wire, one wound on 2.5 cm diameter core and the other on 1.25 cm diameter core. If each spring has n coils, the ratio of their spring constants would be |
| A. | 1?2 |
| B. | 1 |
| C. | 1?8 |
| D. | 1?4 |
| E. | 1?16 |
| Answer» C. 1?8 | |
| 710. |
Two steel shaft each of length L and outside diameter D are subjected to uniform torsion. The first shaft is solid while the second one is hollow with inside diameter D/2. The ratio of the strain energies that these two shafts can absorb without exceeding a maximum allowable shear stress, would be |
| A. | 16?15 |
| B. | 3?4 |
| C. | 8?7 |
| D. | 16?15 |
| E. | 7?8 |
| Answer» D. 16?15 | |
| 711. |
A feinforced concrete beam is considered as made of |
| A. | Composite material |
| B. | Homogeneous material |
| C. | Clad material |
| D. | Hetrogeneous material |
| E. | Isotropic material |
| Answer» D. Hetrogeneous material | |
| 712. |
The shear stress required to cause plastic deformation of solid metals is known as |
| A. | Flow stress |
| B. | Proof stress |
| C. | Rupture stress |
| D. | Ultimate stress |
| E. | None of the above |
| Answer» A. Flow stress | |
| 713. |
Continuous beams are |
| A. | Stronger and much stiffer than simple beams |
| B. | Weaker and less stiffer than simple beams |
| C. | Subjected to excessive shear strain |
| D. | Withstanding double the maximum bending moment on simple beams |
| E. | None of the above |
| Answer» A. Stronger and much stiffer than simple beams | |
| 714. |
The method of increasing fatigue resistance by over-stressing the metal by successively increasing loading is known as |
| A. | Coaxing |
| B. | Relaxing |
| C. | Compounding |
| D. | Bauschinger effect |
| E. | None of the above |
| Answer» A. Coaxing | |
| 715. |
A continuous beam is one which is |
| A. | Infinitely long |
| B. | Supported at two points only |
| C. | Supported at more than two supports |
| D. | Fixed at the ends and simply supported at intermediate point |
| E. | None of the above |
| Answer» C. Supported at more than two supports | |
| 716. |
A mild steel flat 3 m long 150 mm wide and 15 mm thick carries an axial tensile load of 150 kN. If the value of u for mild steel is 0.3, it can be concluded that |
| A. | length, width and thickness all will elongate |
| B. | length and width will increase but thickness will decrease |
| C. | length and thickness will increase but width will ecrease |
| D. | length will increase but width and thickness will decrease |
| E. | None of the above |
| Answer» D. length will increase but width and thickness will decrease | |
| 717. |
A cantilever beam rectangular in cross-section is subjected to a load W at its free end, causing deflection ?1. If the load is increased to 2W, causing deflwction ?2, the value of ?1/?1 would be |
| B. | 22 |
| C. | 4 |
| D. | Stress is proportional to strain at all section |
| E. | 1 |
| Answer» C. 4 | |
| 718. |
In a tensile test conducted on a ductile material, the ratio of the true stress to the engineering stress, is approximately |
| A. | 0.2 |
| B. | 1.05 |
| C. | 0.9 |
| D. | 10 |
| E. | None of the above |
| Answer» C. 0.9 | |
| 719. |
In case of a circular shaft subjected to torque the value of shear stress |
| A. | Has maximum value at the axis |
| B. | Varies linearly from axis to surface |
| C. | Has maximum value at the surface |
| D. | Is uniform throughout |
| E. | Is zero at the axis and linearly increases to a maximum value at the surface of the shaft |
| Answer» E. Is zero at the axis and linearly increases to a maximum value at the surface of the shaft | |
| 720. |
Temperature stresses are set up in a material when |
| A. | it is free to expand or contract |
| B. | it is first heated and then cooled |
| C. | it is first colled and then heated |
| D. | its expansion or contraction is restrained |
| E. | None of the above |
| Answer» D. its expansion or contraction is restrained | |
| 721. |
The effective length of a column effectively held in position and restrained in direction at both ends will be |
| A. | 2L |
| B. | 0.67 L |
| C. | L |
| D. | 1.5 L |
| E. | 0.85 L |
| Answer» A. 2L | |
| 722. |
The average values of modulus of rigidity for Aluminium. Brass Copper, Nickel and Steel in desceading order are given by |
| A. | Aluminium, Nickle, Steel, Brass, Copper |
| B. | Steel, Nickle, Copper, Brass, Aluminium |
| C. | Aluminium, Brass, Copper, Nickel, Steel |
| D. | Aluminium, Copper, Nickel, Brass, Steel |
| E. | Brass, Copper, Aluminium, Nickel, Steel |
| Answer» C. Aluminium, Brass, Copper, Nickel, Steel | |
| 723. |
For punching a hole of 25 mm diameter in a plate 20 mm thick, if the shear stress of plate material is 30 kg/mm2, the force required would be |
| A. | 10,000 kg |
| B. | 18,850 kg |
| C. | 28,850 kg |
| D. | 47,123 kg |
| E. | None of the above |
| Answer» D. 47,123 kg | |
| 724. |
A column that fails primarily due to direct stress is called |
| A. | Long column |
| B. | Weak column |
| C. | Short column |
| D. | Medium column |
| E. | None of the above |
| Answer» C. Short column | |
| 725. |
A uniform steel rope 400 metres long is hung vertically. The weight of the steel is 7.8 gm/cm3 and D = 2100 kg/mm2. The ratio of elongation of first 150 metres to that of first 300 metres would be |
| A. | 1 ; 2 |
| B. | 1 ; 4 |
| C. | 2 ; 1 |
| D. | 4 ; 1 |
| E. | 16 ; 1 |
| Answer» B. 1 ; 4 | |
| 726. |
The materials which exhibit the same elastic properties in all directions are called |
| A. | Visco-elastic |
| B. | Isentropic |
| C. | Isotropic |
| D. | Inelastic |
| E. | Homogeneous |
| Answer» C. Isotropic | |
| 727. |
The size of hole drilled in plates for rivetting is |
| A. | Equal to the diameter of rivet shank |
| B. | Slightly smaller than the diameter of river shank |
| C. | 1.5 to 2 mm smaller than the diameter of rivet for revets of 25 mm and above size |
| D. | 1.5 to 2 mm large than the diameter of the rivet for rivets of 25 mm and above size |
| E. | None of the above |
| Answer» D. 1.5 to 2 mm large than the diameter of the rivet for rivets of 25 mm and above size | |
| 728. |
The potential energy stored up in a deformed body is known as |
| A. | Strain energy |
| B. | Potential energy |
| C. | Resilience |
| D. | Deformation energy |
| E. | None of the above |
| Answer» C. Resilience | |
| 729. |
Laminated springs are generally |
| A. | loaded at ends and supported at centre |
| B. | loaded at centre and supported at ends |
| C. | loaded as well as supported at centre |
| D. | loaded as well as supported at ends |
| E. | None of the above |
| Answer» B. loaded at centre and supported at ends | |
| 730. |
A body having similar properties throughout its volume is said to be |
| A. | Uniform |
| B. | Isotropic |
| C. | Contimuous |
| D. | Homogeneous |
| E. | Isentropic |
| Answer» D. Homogeneous | |
| 731. |
The units of true strain are |
| A. | cm/cm |
| B. | kg/cm |
| C. | kg-cm/cm |
| D. | Dirnensionless |
| E. | None of the above |
| Answer» D. Dirnensionless | |
| 732. |
A material capable of absorbing large amounts of energy is known as |
| A. | Ductile |
| B. | Shock proof |
| C. | Resilient |
| D. | Hard |
| E. | Tough |
| Answer» E. Tough | |
| 733. |
For beam of length L fixed at two ends A and B and loaded W at the centre C the maximum bending moment will |
| A. | Occur at A |
| B. | Occur at B |
| C. | Occur at C |
| D. | (A) and (B) above |
| E. | (A) (B) and (C) above |
| Answer» E. (A) (B) and (C) above | |
| 734. |
In M.L.T. system the dimensions of Young's modulus of elasticity are |
| A. | MLT |
| B. | ML-1 T-2 |
| C. | MLT-2 |
| D. | ML-2 T-2 |
| E. | MLT-1 |
| Answer» B. ML-1 T-2 | |
| 735. |
If, for a given material, the modulus of elasticity is equal to twice its modulus of rigidity (G), then the bulk modulus is |
| A. | 2 G |
| B. | 0.33 G |
| C. | 9 G |
| D. | 0.67 G |
| E. | None of the above |
| Answer» D. 0.67 G | |
| 736. |
For a thin longitudinal cylinder the ratio hoop stress/longitudinal stress is |
| A. | 4 |
| C. | 2 |
| D. | 1 |
| Answer» C. 2 | |
| 737. |
The modulus of resilience is |
| A. | The energy stored in a body |
| B. | Strain energy stored in a specimen when strained within elastic limit |
| C. | The maximum energy stored at elastic limit per unit volume. |
| D. | Strain energy stored in a specimen when strained beyond elastic limit |
| E. | The maximum energy stored at elastic limit |
| Answer» C. The maximum energy stored at elastic limit per unit volume. | |
| 738. |
The strain energy stored in a specimen when strained within elastic limit is known as |
| A. | Proof strain energy |
| B. | Strain energy |
| C. | Elastic limit strain energy |
| D. | Resilience |
| E. | None of the above |
| Answer» D. Resilience | |
| 739. |
Euler's formula is not applicable to columns |
| A. | with both ends free |
| B. | with both ends fixed |
| C. | of composite material |
| D. | having slenderness ratio less than 80 |
| E. | None of the above |
| Answer» D. having slenderness ratio less than 80 | |
| 740. |
A non-wielding support means |
| A. | Support that restores elongation after the load is removed |
| B. | Slope of the beam at the support is zero |
| C. | Support is frictionless |
| D. | Support that does not elongate |
| E. | Support holds the load firmly and safely |
| Answer» B. Slope of the beam at the support is zero | |
| 741. |
The moment of inertia of an area will be least with respect to |
| A. | central axis |
| B. | horizontal |
| C. | vertical axis |
| D. | moment of area does not depend on axes |
| E. | None of the above |
| Answer» A. central axis | |
| 742. |
If this shaft is to be replaced by a hollow shaft of texternal diameter 22 mm for the same maximum shear stress and same torque, the internal diameter will be |
| A. | 15.5 mm |
| B. | 11 mm |
| C. | 21 mm |
| D. | 31 mm |
| E. | 51 mm |
| Answer» D. 31 mm | |
| 743. |
A column is known as short column if |
| A. | The length is more than 30 times the diameter |
| B. | The slenderness ratio is more than 32 |
| C. | Slenderness ratio is more than 120 |
| D. | The length is less than 8 times the diameter |
| E. | The length is 15 times the diameter |
| Answer» D. The length is less than 8 times the diameter | |
| 744. |
Two beams of equal cross-sectional area are subjected to equal bending moment. If one beam has square cross-section and the other has circular section, then |
| A. | The suitability of section will depend on the nature of loading |
| B. | In shear, square section beam will be stronger |
| C. | Both beams will be equally strong |
| D. | Square section beam will be economical |
| E. | Circular section beam will be economical |
| Answer» D. Square section beam will be economical | |
| 745. |
The slenderness ratio of vertical comumn of square cross-section of 2.5 cm sides and 600 cm length is |
| A. | 500 |
| B. | 200 |
| C. | 100 |
| D. | 900 |
| E. | 1000 |
| Answer» D. 900 | |
| 746. |
The torsional resisting moment of the following section is being considered with identical characteristic parameter. Which section will have maximum torsional resisting moment |
| A. | Hollow circular |
| B. | Circular |
| C. | Triangular |
| D. | Square |
| E. | Hexagonal |
| Answer» E. Hexagonal | |
| 747. |
The force required to punch a 25 mm hole in a mild steel pipe 10 mm thich, when ultimate shear stress of the plate is 500 N/mm2 will be nearly |
| A. | 78 kN |
| B. | 98 kN |
| C. | 393 kN |
| D. | 158 kN |
| E. | None of the above |
| Answer» C. 393 kN | |
| 748. |
During the tensile test on a glass rod, the nature of stress section curve is |
| A. | Vertical line |
| B. | Sudden break |
| C. | Same as that for mild steel |
| D. | Horizontal line |
| E. | Straight line |
| Answer» B. Sudden break | |
| 749. |
The plastic moment of a beam can be 50 percent more than the maximum elastic moment in case the cross-section of the beam is |
| A. | Circular |
| B. | Rectangular |
| C. | Elliptical |
| D. | I-section |
| E. | Semi-circular |
| Answer» B. Rectangular | |
| 750. |
If unit loads rest upon a beam at two points A and B, the deflection at A due to unit load at B, equals the deflection at B due to the unit load at A. This is known as |
| A. | Rankine's theorem |
| B. | Mohr's hypothesis |
| C. | Castigliano's theorem |
| D. | Maxwell's theorem |
| E. | None of the above |
| Answer» D. Maxwell's theorem | |
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