Jixozlarni markazlashtirilgan ta’mirlash tsexining elektro-montyorlar uchun 5-6 razryadli test savollari

68.Fazalar rangi ketma-ketligi qaysi javobda to’g’ri ko’rsatilgan?
A) Faza – “A” (qizil); faza – “V” (yashil); faza – “S” (sariq).
B) Faza – “A”(yashil); faza – “V” (sariq); faza – “S” (qizil).
V) Faza – “A” (sariq); faza – “V”(yashil); faza – “S” (qizil).
G) Faza – “A” (qizil); faza – “V”(sariq); faza – “S” (yashil).
To’g’ri javob: V.


69. Magnit puskatellarning kontaktlari orqali o’tayotgan tok miqdoriga nisbatan qanday kattaliklari (velichina) mavjud.
Javob:
A) To’g’ri javob ko’rsatilmagan.
B) 0 – kattalikdagi 2,5 ampergacha
1 – kattalikdagi 6 ampergacha
2 – kattalikdagi 16 ampergacha
3 – kattalikdagi 32 ampergacha
4 – kattalikdagi 50 ampergacha
5 – kattalikdagi 100 ampergacha
6 – kattalikdagi 200 ampergacha
V) 0 – kattalikdagi 4 ampergacha
1 – kattalikdagi 10 ampergacha
2 – kattalikdagi 25 ampergacha
3 – kattalikdagi 40 ampergacha
4 – kattalikdagi 60 ampergacha
5 – kattalikdagi 100 ampergacha
6 – kattalikdagi 150 ampergacha
G) 0 – kattalikdagi 10 ampergacha
1 – kattalikdagi 25 ampergacha
2 – kattalikdagi 40 ampergacha
3 – kattalikdagi 75 ampergacha
4 – kattalikdagi 100 ampergacha
5 – kattalikdagi 125 ampergacha
6 – kattalikdagi 160 ampergacha
To’g’ri javob: V.

70. Uch fazali elektr dvigatellar aktiv quvvatini xisoblash formulasi.
Javob:
A) P=√3* U_l *I *^.Sinφ* η ;
bu yerda- U_l- fazalararo kuchlanish;
√ 3 – uch fazali dvigatellar uchun koeffitsient.
Sinφ – quvvat koeffitsienti (1.73)
η – foydali ish koeffitsienti ( 0.7-0,9).
B) P=√3* U_l *I *^.cosφ* η ;
bu yerda- U_l- fazalararo kuchlanish;
√3 – uch fazali dvigatellar uchun koeffitsient.
Cosφ – quvvat koeffitsienti ( 0,7- 0,98)
η – foydali ish koeffitsienti ( 0.7-0,9).
V) P=√3* U_l *I *^.tgφ* η ;
bu yerda- U_l- fazalararo kuchlanish;
√3 – uch fazali dvigatellar uchun koeffitsient.
tgφ – quvvat koeffitsienti (0,2-0,4)
η – foydali ish koeffitsienti ( 0.7-0,9).
G) P=(√3* U_l *I *^.cosφ ) / η ;
bu yerda- U_l- fazalararo kuchlanish;
√3 – uch fazali dvigatellar uchun koeffitsient.
Cosφ – quvvat koeffitsienti ( 0,7- 0,98)
η – foydali ish koeffitsienti ( 0.7-0,9).

To’g’ri javob: B.