Most brittle failures occur:

ABelow the impact transition temperature.

BOn thinner materials.

COn ''clean'' steel.

DWhile in operation at elevated temperatures.

Answer : A

Most brittle failures appear as:

ABranched cracking.

BIntergranular cracking.

CDuctile tears.

DCleveage.

Answer : D

Which of the following is not a method used to prevent brittle fracture?

AThorough inspections

BStrict controls on selecting construction materials

CPost weld heat treatment

DControlling minimum operating temperatures

Answer : A

Thermal fatigue is caused by:

ACyclic stresses that come from temperature variations.

BLong term operation at elevated temperatures.

CExcessive thermal growth.

DHours of physical activity during a hot summer day.

Answer : A

Time to failure by thermal fatigue is primarily affected by:

AMagnitude of stress and operating temperature.

BMagnitude of stress and number of cycles.

CCarbon content in material and operating temperature.

DCarbon content in material and number of cycles.

Answer : B

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