em hay thiet ks mot mach dien nhu sau bist mach dim co cauchi bao v g6m 2

Hay cho biSt mach nay co kSt qua hoat dQng nhir thS nao?. Hay ve lai sa d6 Iy thuyet cua mach bi ve saib[r]

DETHI CHON DOl TUYEN HOC SINH Glin LOP 9

MON THI: CONG NGHt Ngay thi: Thir Bay 04/0112020

Tho'i gian lam bai: 60 phut (khong ki phtitoJ)

D~ Iy thuy~t (co trang) NAMHQC: 2019-2020

H9 ten thi sinh: s6baa danh: .

Cau 1: (2.0 di~m)

Em hay thiet kS mot mach dien nhu sau: BiSt mach dim co cAuchi bao v~ g6m cong t~c ch~u diSu khiSn den cho khi:

- Dong cong t~c thir nhar va cong t~c thir hai thi ba den dSu sang to - Khi ng~t cong t~c thir nh~t va cong t~c thir hai thi ba den dSu sang rna.

Cau 2: (2.0 di~m)

M9t mach di~n co yeu cAucua dS bai nhu sau:

- CT1avitri 1, CT2avitri 2: den sang, den khong sang;

- CT1 avitri 1, CT2 avitri 1: den sang rna, den sang rna;

- CTt avitri 2, CT2 avi tri 1: den sang, den khong sang;

- CTt avitri 2, CT2 avitri 2: den 1sang, den sang

Tuy nhien sau I~p mach nhu sa d6 thuc hanh a hinh ve thi mach hoat d9ng khong dung yeu cau;

a Hay cho biSt mach co kSt qua hoat dQng nhir thS nao? b Hay ve lai sa d6 Iy thuyet cua mach bi ve sai

Cau 3: (2.0 di~m)

Hay ve so d6 ly thuyet va so thuc hanh cua mach dien voi cac phan ill dien, thiet bi dien g6rn: 01 c~u chi, cong dC2 chau, bong dim 220V/40W voi yeu c~u sau: c~u chi bao v~ toan mach; cong tic chau dong mosao cho mach di~n thuc hien bong den sang to, sang mo

Cau 4: (2.0di~m)

Hay ve so d6 Iy thuyet va SO' 6 thirc hanh cua mach di~n voi cac phan tiI dien,

thi~t bi dien g6rn: c~u chi bao v~ h; 6dien co dien thirong tnrc; dim 75w/220v (D" D2, D3) va 01 den huynh quang ,6m120w voi yeu c~u sau:

~anh thir ~fit g6m ~ong t ba chau CT}, CT2 diSu khien dQc I~p den D, (co

the b~t Hit den bat ky cong tilc nao e~u chi CCI bao v~ va 16di~n

Nhanh thir hai g6m cong tdc ba chfiu CT3 co tac d\ffig vi tff thi den D2,

D3 sang to, cong tdc CT I va CT2 di u khien den DI tdt sang binh thuOng; vi tri thi den D2, D3 tdt, den DI luon sang ,{tcu tr~g thai nao cua cong tic CT I va CT2· Va

cong tde CT4 diSu khien dQc l~p den ,6rn/20w.

Cau 5: (2.0di~m)

Hay vi~t cac buoc th\fc hi~n d' th\fc hanh rn~ch di~n theo nQi dung cua de baL

-

HET- _ L_

"

DE THI THUC HANH MON CONG NGHE 9. .

THOI GIAN LAM BAI: 90 phut

Em hay l~p d~t mach di~n cho din nha g6m co phong thea yeu cau sau:

Phong (nhanh thir nhat): cong t~c CT}, CT2 dieu khien dQc l~p den DJ (co thS

b~t t~t den bftt ky cong t~c nao)do C1bao v~va co 16di~n dung cho cac thiet bi dien.

Phong (nhanh thir hai): cong t~c CT3 co tac dung nhu sau: vi tri thi den

D2, D3sang to, cong t~c CT1 va CT2 di@ukhiSn den Dl t~t sang binh thuong; vi

tri thi den D2, D3t~t, D. den sang bftt cir trang thai cua cong t~c CT1 va CT2 (vo hieu

hoa congt~c nay) Va phong co 1den huynh quang (0,6 m) diroc dieu khiSn boi cong t~c CT4

Mach tren bao gom cau chi bao v~ mach; 16 dien co dien thuong tnrc; den 75w/220v (D], D2, D3)va 01 den huynh quang 0,6m

Vitri kich thurrc mach nhu hinh ve, cac thiet bi dien b6 tri can d6i

Vitri cong tilc chftu nhu hinh ve

120 120 120 120 120

I / ~

0

"l

.-0

"l

N

Dl CCI D2 D3 CC2

CTI CT2

CT3 CT4

,-,

61 62

HET-BApAN

Can : (2.0di~m)

Mach dien nhir sau: mach den co c~u chi bao v~ g6m 2 cong t~c chAu di@u khien ba den cho khi:

Dong cong tic thir nhat va cong tic thir hai thi ba den dSu sang to. Khi ngat cong t~c thir nh~t va cong t~cthir hai thi ba den dSu sangrna.

N

Can 2: (2.0di~m)

CT1 CT2 DI D2

1 Ma Ma

2 Ma Ma

1 nit To

2 Ma Ma

N N

I¥ -.

P

1 -1

1

1

1

1 1

1

1

Hinhsai Hinh dung

Can 3: (2.0 di~m)

So db ly thuyet va thuc hanh cu mach dien voi v~t lieu, thi~t hi dien gbm: 01 cAu chi, cong tic chau, bong den 220 140W voi yeu cAunhu sau: cAu chi bao v~ toan

mach, congtAc 2 chAudong rna sao c 0mach di~n thuc hien den sang to, sang rna.

Can 4: (2.0 di~m)

N

p

11

N

Can 5: (2.0 di~m)

Cac buoc thirc hien d~ thuc hanh mach dien :

- Chuan bi dung cu, v~t tu, thiet bi (phan til dien) sad6vi tri - Ve sad6mach dien

- Xac dinh vi tri, kich thiroc 6ng chua day d~n - C~t &ng chua day dan va I~p d{tt

- Xac dinh kich thiroc day d~n, mau day (neu co yeu cftu) va I~p d{ttday dan - Thuc hien n6i day mach dien, voi thiet bi theo yeu cau d~ bai

- L~p thiet bi voi bang dien va g~n vao bang di~n Ian - Ki~m tra, dieu chinh (neu co)