sinf – nazorat ishi

8. O’zgaruvchan tok o’tayotgan o’tkazgichdagi kuchlanishni o’zgartiradigan asbob?

A) transformator B) Ampermetr C) elektrostansiya D) rotor

9. Gapni to'ldiring: "Elektr energiyasini uzatish liniyalarida energiya isrofini kamaytirish uchun …. kerak." A) tok kuchini o’zgartirmay kuchlanishni orttirish B) tok kuchini kamaytirib, kuchlanishni orttirish C) tok kuchini orttirib kuchlanishni pasaytirish D) kuchlanishni kamaytib, chastotani orttirish

10. Takomillashtirilgan transformatorlarning foydali ish koeffisienti qanchaga teng ?

A) 99 – 99,5 % B) 75 – 80 % C) 50 – 60 % D) 80 – 89 %