Percentage reduction of area in performing tensile test on cast iron may be of the order of__________________?

Related Mcqs:

1. The percentage reduction in area of a cast iron specimen during tensile test would be of the order of_________________?

   A. more than 50%
   B. 25—50%
   C. 10—25%
   D. 5—10%
   E. negligible

2. In a tensile test on mild steel specimen, the breaking stress as compared to ultimate tensile stress is_________________?

   A. more
   B. less
   C. same
   D. more/less depending on composition
   E. may have any value

3. During a tensile test on a specimen of 1 cm cross-section, maximum load observed was 8 tonnes and area of cross-section at neck was 0.5 cm2. Ultimate tensile strength of specimen is___________________?

   A. 4 tonnes/cm2
   B. 8 tonnes/cm2
   C. 16 tonnes/cm2
   D. 22 tonnes/cm2
   E. none of the above

4. The value of Poisson’s ratio for cast iron is_________________?

   A. 0.1 to 0.2
   B. 0.23 to 0.27
   C. 0.25 to 0.33
   D. 0.4 to 0.6
   E. 3 to 4

5. In a tensile test, near the elastic limit zone, the______________?

   A. tensile strain increases more quickly
   B. tensile strain decreases more quickly
   C. tensile strain increases in proportion to the stress
   D. tensile strain decreases in proportion to the stress
   E. tensile strain remains constant

6. In the tensile test, the phenomenon of slow extension of the material, i. e. stress increasing with the time at a constant load is called_____________?

   A. creeping
   B. yielding
   C. breaking
   D. plasticity
   E. none of the above

7. Tensile strength of a material is obtained by dividing the maximum load during the test by the_________________?

   A. area at the time of fracture
   B. original cross-sectional area
   C. average of A. and B.
   D. minimum area after fracture
   E. none of the above.

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

   A. size of rivet
   B. size of the drilled or reamed hole
   C. average of size of rivet and hole
   D. smaller of the two
   E. any one of the above

9. The ultimate tensile stress of mild steel compared to ultimate compressive stress is__________________?

   A. same
   B. more
   C. less
   D. more or less depending on other factors
   E. unpredictable

10. Strain is defined as the ratio of__________________?

    A. change in volume to original volume
    B. change in length to original length
    C. change in cross-sectional area to original cross-sectional area
    D. any one of the above
    E. none of the above