MCQOPTIONS
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MCQOPTIONS
| 1. |
Age hardening is a process done at______________? |
| A. | Heating up to 200 – 450°C for 15 – 30 min and quenching in water |
| B. | Heating at 700°C for 10 – 15 min and quenching in water |
| C. | Heating at 700°C for 1 hour and quenching in water |
| D. | Heating above 700°C for 30 min and quenching in water |
| Answer» B. Heating at 700°C for 10 – 15 min and quenching in water | |