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Electrical Machines (D.C. Generators)

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Material Science Quiz (Mechanical Properties of Metals)

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Material Science Quiz (Failure)

1. Failure due to excessive deformation is controlled by ______________. (a) Material properties (b) Design & Dimensions (c) Both (d) None 2. Failure due to excessive deformation is controlled by ______________. (a) Yield strength (b) Tensile strength (c) Young’s modulus (d) All 3. Time dependent yield is known as (a) Fracture (b) Fatigue (c) Buckling (d) Creep 4. Cleavage fracture appears (a) Bright (b) Dull (c) Difficult to identify (d) None 5. Usually materials with following crystal structure fail in ductile mode (a) FCC (b) BCC (c) HCP (d) None 6. Brittle fracture is more dangerous than ductile fracture because _______________. (a) No warning sign (b) Crack propagates at very high speeds (c) No need for extra stress during crack propagation (d) All 7. Fracture voids usually form at (a) Inclusions (b) Second phase particles (c) Grain boundary triple points (d) All 8. Fracture stress (σf) is proportional to (a) crack length (b) 1/crack length (c) (crac
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