Between 230°C and 370°C, blue brittleness is caused in mild steel because of the
A. Immobility of dislocation
B. Strain-ageing
C. Increase in Young's modulus
D. Strain hardening
Answer: Option B
A. Immobility of dislocation
B. Strain-ageing
C. Increase in Young's modulus
D. Strain hardening
Answer: Option B
Which of the following will resist maxi-mum shock & vibration without cracking?
A. Grey cast iron
B. White cast iron
C. Malleable iron
D. Graphite
A. Pulverised fuel
B. Travelling grate stoker firing
C. Circulating fluidised bed
D. Fluidised bed
Isotropic materials have the same __________ in all directions.
A. Induced stresses
B. Density
C. Elastic properties
D. Thermal properties
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