Concrete Technology Multiple Choice Questions on “Testing”.
1. In universal testing machine, for a circular section specimen, the gauge length is taken to be _____________
a) 3.65 √A
b) 4.65 √A
c) 5.65 √A
d) 6.65 √A where A is the area of cross section of the specimen
Answer: c
Clarification: It is the formula to find the gauge length when we have the area of the specimen in a universal testing machine.
2. During compression test of cast iron, the failure occurs i.e. the crack appears along the _________
a) Diagonal
b) Surface parallel to load applied
c) Surface perpendicular to load applied
d) Lateral
Answer: a
Clarification: The failure occurs i.e., the crack appears along the diagonal during the compression test of cast iron.
3. The indenter used in Brinell hardness test is a ________________
a) Ball
b) Cone
c) Cylinder
d) Pyramid
Answer: b
Clarification: The Brinell method applies a predetermined test load (F) to a carbide ball of fixed diameter (D) which is held for a predetermined time period and then removed.
4. In charpy test specimen, the angle of v-notch section is ___________
a) 30 degrees
b) 45 degrees
c) 60 degrees
d) 90 degrees
Answer: b
Clarification: In charpy test specimen, the angle of v-notch section is 45 degrees and 0.25mm radius along the base.
5. During radiography test, which region absorbs less radiation and transmits more?
a) Low and high density regions absorb and transmit same amount of radiation
b) High density region
c) Low density region
d) Low and high density regions adsorb
Answer: c
Clarification: This method uses short wavelength electromagnetic radiations such as X-rays and γ rays to detect internal defects. In this method the component to be tested is placed in path of radiations caused due to X-rays or γ rays.
6. Which test is used to determine the dimensions of any object?
a) Ultrasonic test
b) Torsion test
c) Eddy current test
d) Compression test
Answer: c
Clarification: Eddy current test is used to determine dimensions of objects, to detect cracks. An eddy current instrument consists of a probe or coil, an electronic unit for generating frequency and a CRT unit for display purpose.
7. In which type of test the capillary action principle is used?
a) Probe test
b) Bend liquid test
c) Dye penetrant test
d) Torsion test
Answer: c
Clarification: Dye penetrant test uses the capillary action principle to detect surface discontinuities. In this method liquid is applied on a metallic surface and it gets entered into cracks which are open.