61. Tezkesar po'latlarga termik ishlov berishning makbul rejimini tanlang.
A) 1270…12900S dan toblab, 3 marta 550…5700S da bushatish;
B) 1000…10500S dan toblab, 2 marta 550…5700S da bushatish;
C) 1250…13000S dan toblab, 3 marta 120…1600S da bushatish;
D) 1100…12900S dan toblab, 3 marta 400…4500S da bushatish;
62. Qizdirilganda deformasiyalangandan oldingi shakliga qaytish xususiyatiga ega materiallar
tarkibiga qanday elementlar kiradi?
A) Titan-nikel, titan-oltin, oltin-kadmiy;
B) Temir-uglerod-nikel;
C) Mis-kaliy-berilliy;
D) Kurgoshin –surma-kalay;
63. Yuqori elektr qarshilikka ega bulgan materialni kursating.
A) Uglerodli va legirlangan po'lat;
B) Bronza, latun;
C) Duralyuminiy, silumin;
D); Nixrom, fexrom, konstantin, manganin
Do'stlaringiz bilan baham: |