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block

309. Which of the following materials properties are of most concern if corrosion resistance is essential?

Select the correct answer(s).  

(0/0)

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Chemical properties.

Processing properties.

Mechanical properties.

Physical properties.

none

307. Materials properties, as used in design, are most frequently determined by:

Select the correct answer(s).  

(0/0)

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materials testing.

fracture mechanics testing.

the National Institute of Standards and Technology (NIST).

theoretical analysis.

none

483. Which of the following measurement tools uses the principle of light wave interference to check surface flatness?

Select the correct answer(s).  

(0/0)

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Sine bar.

Optical comparator.

None of the above.

Vernier caliper.

Go/no go gage.

none

482. Devices that show magnified reflected or profile images of the work piece on a frosted glass screen are called:

Select the correct answer(s).  

(0/0)

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optical gages.

optical comparators.

optical micrometers.

optical projectors.

optical flats.

none

317. Which of the following materials is typically considered when the application only requires high compressive strength?

Select the correct answer(s).  

(0/0)

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High carbon steel.

Magnesium

Cast iron.

Low carbon steel.

none

303. An important basis for the success of fracture control design procedures is:

Select the correct answer(s).  

(0/0)

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in the use of large factors of safety.

all of the above.

the need to assure that unexpected flaws of some critical size are not present when the component enters service.

that all flaws are detected by NDT or proof testing before the component enters service.

in the use of a value of strength that the material used in the design is presumed to possess.

none

318. A fatigue failure can often be prevented by using NDT to:

Select the correct answer(s).  

(0/0)

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verily the cyclic loading on a component part.

detect surface discontinuities that could be stress risers.

determine percent elongation of a material before it is placed in service.

measure the endurance limit of a part undergoing cyclic stresses.

none

311. Tensile tests are conducted on specimens from a newly developed alloy in order to determine the ultimate tensile strength of the material. Such tests are referred to as:

Select the correct answer(s).  

(0/0)

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destructive tests.

physical properties tests.

indirect tests.

none

Even at the early stages of product planning, NDT should be considered because:

Select the correct answer(s).  

(0/0)

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it may be required by codes and specifications.

the materials selected should be compatible with a NDT technique that can accurately evaluate the product.

the design of the part should permit easy access to critical areas for later inspection.

all of the above.

none

304. If properly used, NDT can assist in fracture control by:

Select the correct answer(s).  

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providing an accurate evaluation of the number and type of discontinuities that exist in a material.

predicting the time it will take a given size discontinuity to grow to a critical size.

accurately measuring the tensile strength of design materials.

all of the above.

none

312. A bar that is 31 cm (12 in.) long, 51 mm (2 in.) wide, and 25 mm (1 in.) thick is subjected to a tensile load acting along the length of the bar of 36,000 lbs. What is the tensile stress within the bar?

Select the correct answer(s).  

(0/0)

---

l,500psi.

3,000 psi.

12,000 psi.

18,000 psi.

36,000 psi.

none

306. Most solid metals and plastics that have reasonable strength at room temperature are called:

Select the correct answer(s).  

(0/0)

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engineering materials.

composite materials.

manufacturing materials.

allotropic materials.

raw materials.

none

310. Which of the following is true relative to the comparison of the properties of aluminum-based alloys and iron-based alloys?

Select the correct answer(s).  

(0/0)

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Iron is preferred in load carrying designs, but it should not be used for any deformation type of manufacturin process.

All of the above.

Iron can be alloyed to increase its strength, whereas aluminum is strongest in its pure state.

Iron can exist in several different crystalline structures, and its properties can be controlled by heat treatment

Iron has a lower melting point than aluminum.

none

316. The modulus of elasticity, or Young's modulus, is a measure of the material's relative:

Select the correct answer(s).  

(0/0)

---

compressive strength.

stiffness, yield strength.

resistance to stress.

tensile strength.

none

A statement that a particular experiment produced a 0.9 probability of detection with a 95% confidence level means that:

Select the correct answer(s).  

(0/0)

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on the average, 90% of all flaws will be detected.

on the average, 95 out of 100 flaws will be detected 90% of the time.

there is a 95% probability that the probability of detection is overstated.

there is a 5% probability that the probability of detection is overstated.

on the average, 95% of all flaws will be detected.