Test savollari variant №1. Inson xayoti uchun qaysi tok kuchi havfli?

52. Ultratovush yordamida payvandlashda necha gts mehanik tebranish bo’ladi?

*A) 20000

B) 12000

C) 30000

D) 10000

53. Ikki tomonlama uzlukli choklar nima deb ataladi?

*A) zanjir

B) uchma uch

C) burchak

D) Tavrsimon

54. Elektrod metali tomchisining o’rtacha harorati necha C bo’ladi?

*A) 2300

B) 1500

C) 1800

D) 2600

55. Flyus ostida avtomatik va yarimavtomatik payvandlash uchun necha mmli simlar ishlatiladi?

*A) 2-6

B) 6-8

C) 10-12

D) 8-10

56. Korbonat angidrid gazi muhitida payvandlash usuli kim tomonidan ishlab chiqilgan?

*A) K.V. Lyubavskiy

B) D.L.Glizmanenko

C) A.I.Chudikov

D) Uilyam Tomson

57. Erimaydigan ko’mir elektrod bilan elektryoyli payvandlash usuli nechanchi yil ixtiro qilingan?

*A) 1882

B) 1900

C) 1950

D) 1853

58. Eriydigan metal elektrod bilan yoyli payvandlashni kim tomonidan taklif etilgan?

*A) N.G.Slavyanov

B) D.L.Glizmanenko

C) A.I.Chudikov

D) Uilyam Tomson