mechanical engineering MCQs – Page 139

Practise multiple-choice questions from mechanical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

mechanical engineering Mcqs

1. compressors gas turbines and jet engines 2. theory of machines 3. nuclear power plants 4. engineering materials 5. strength of materials mechanical engineering 6. thermodynamics 7. heat transfer 8. i c engines 9. steam boilers engines nozzles and turbines 10. engineering mechanics 11. fluid mechanics mechanical engineering 12. production technology 13. machine design 14. hydraulic machines 15. workshop technology 16. refrigeration and air conditioning

2761. The total elongation produced in a bar of uniform section hanging vertically downwards due to its own weight is equal to that produced by a weight________________?
0

A. of same magnitude as that of bar and applied at the lower end

B. half the weight of bar applied at lower end

C. one-fourth of weight of bar applied at lower end

D. none of the above

E. half of the square of weight of bar applied at lower end

2762. The ratio of direct stress to volumetric strain in case of a body subjected to three mutually perpendicular stresses of equal intensity, is equal to___________________?
0

A. modulus of rigidity

B. modulus of elasticity

C. Poissons ratio

D. Youngs modulus

E. bulk modulus

2763. Rivets are made of following type of material_________________?
0

A. hard

B. malleable

C. tough

D. resilient

E. ductile

2764. The distance between the centres of the rivets in adjacent rows of zig-zag riveted joint is known as ____________________?
0

A. back pitch

B. diagonal pitch

C. diametral pitch

D. pitch

E. lap

2765. The M.I. of hollow circular section about a central axis perpendicular to section as compared to its M.I. about horizontal axis is________________?
0

A. half

B. one fourth

C. same

D. double

E. four times

2766. In riveted boiler joints, all stresses, shearing, bearing and tensile are based on the_________________?
0

A. smaller of the two

B. size of rivet

C. average of size of rivet and hole

D. size of the drilled or reamed hole

E. any one of the above

2767. Strain is defined as the ratio of__________________?
0

A. change in volume to original volume

B. change in cross-sectional area to original cross-sectional area

C. none of the above

D. any one of the above

E. change in length to original length

2768. If the rivets in adjacent rows are staggered and the outermost row has only one rivet, the arrangement of the rivets is called__________________?
0

A. criss-cross riveting

B. none of the above

C. chain riveting

D. zig zag riveting

E. diamond riveting

2769. The maximum strain energy that can be stored in a body is known as________________?
0

A. proof resilience

B. resilience

C. impact energy

D. toughness

E. modulus of resilience

2770. The stress at which extension of the material takes place more quickly as compared to the increase in load is called______________?
0

A. ultimate point of the material

B. yielding point of the material

C. plastic point of the material

D. elastic point of the material

E. breaking point of the material

2771. Poissons ratio is defined as the ratio of_________________?
0

A. longitudinal stress and longitudinal strain

B. longitudinal stress and lateral stress

C. lateral stress and longitudinal stress

D. lateral stress and lateral strain

E. none of the above

2772. The weakest section of a diamond riveting is the section which passes through ___________________?
0

A. none of the above

B. the first row

C. the second row

D. one rivet hole of the end row

E. the central row

2773. The C.G. of a right circular solid cone of height h lies at the following distance from the base________________?
0

A. J/3

B. h/4

C. h/6

D. h/2

E. 3/i/5

2774. Longitudinal stress in a thin cylinder is__________________?
0

A. half of the hoop stress

B. twice the hoop stress

C. equal to the hoop stress

D. one-fourth of hoop stress

E. four times the hoop stress

2775. A boiler shell 200 cm diameter and plate thickness 1.5 cm is subjected to internal pressure of 1.5 MN/m , then the hoop stress will be_________________?
0

A. 200 MN/m2

B. 50 MN/m2

C. 100 MN/m2

D. 30 MN/m2

E. 300 MN/m2

2776. The torsional rigidity of a shaft is expressed by the_______________?
0

A. elastic limit up to which it resists torsion, shear and bending stresses

B. number of cycles it undergoes before failure

C. maximum power it can transmit at highest possible-speed

D. maximum torque it can transmit

E. torque required to produce a twist of one radian per unit length of shaft

2777. The strain energy stored in a body due to suddenly applied load compared to when it is applied gradually is____________________?
0

A. twice

B. half

C. four times

D. same

E. eight times

2778. A projectile is fired at an angle 9 to the vertical. Its horizontal range will be maximum when 9 is__________________?
0

A. 90.

B. 45

C. 60

D. 30

E. 0

2779. The value of modulus of elasticity for mild steel is of the order of________________?
0

A. 2.1 x 107 kg/cm2

B. 2.1 X 106 kg/cm2

C. 0.1 xlO6 kg/cm2 (<?) 3.8 x 106 kg/cm2

D. 2.1xl05 kg/cm2

2780. A riveted joint in which the number otrivets decrease from innermost to outer most row is called__________________?
0

A. none of the above

B. criss-cross riveted joint

C. zig-zag riveted joint

D. chain riveted joint

E. diamond riveted joint

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