Cau Hoi Trac Nghiem on Tap

Ngn hng thi mn CNG NGH KIM LOI (1126020)

1

TRNG I HC S PHM K THUT CNG HA X HI CH NGHA VIT NAM THNH PH H CH MINH c lp T do Hnh phc KHOA C KH MY ---------------------------------------- ------------------------------- Tp.H Ch Minh, ngy 15 thng 6 nm 2006

NGN HNG CU HI V B THI DANH SCH CU HI

MN: CNG NGH KIM LOI. M S: 1126020 Cu 1: Ct o l:

a-Hn hp ct nh v t st. b-Hn hp ca ct, t st v du thc vt. c-Lp hn hp tip xc vi kim lai lng. d-Lp hn hp c thng kh cao.

Cu 2: Ct m l:

a-Hn hp ca ct ht to v t st. b-Lp hn hp khng tip xc vi kim lai lng. c-Hn hp gm ct, t st v mn ca. d-Lp hn hp c thng kh cao.

Cu 3: Cho du thc vt vo hn hp lm khun :

a-Tng bn v tnh chu nhit. b-Tng bn v tnh thng kh. c-Tng tnh chu nhit v tnh thng kh d-Tng bn v tnh bm dnh.

Cu 4: S dng ct ht to, hn hp lm khun s c:

a-Tnh bn cao. b-Tnh chu nhit cao. c-Tnh thng kh cao. d-Tnh r tin Cu 5: S dng ct tinh khit lm li s c li cho:

a-Tnh thng kh. b-Tnh bn . c-Tnh chu nhit. d-Tnh ln. Cu 6: m ca hn hp lm khun khi lm khun ti ly:

a-3% b-8% c-5% d-12% Cu 7: Cc kim lai v hp kim sau y lai no lm mu c c li v kinh t v k thut nht:

a-Gang xm. b-Silumin. c-Brng d-Hp kim Mg Al. Cu 8:

Cng thc sau y dng tnh g: C

PHH p 2

2

=

a-Chiu cao ng rt. b-H thng rt. c-Trng lng khun. d-Khi lng vt c.

Cu 9: Cng thc sau y dng tnh g? G=10.n.(F.H. + Vli. GKT).

a-Khi lng vt c. b-Khi lng h thng rt. c-Khi lng hn hp lm khun trong khun c . d-Trng lng khun

Cu 10: Khi c, co ca gang xm lng l:

a-0,5% b-1%. c-2%. d-5%.


2

Cu 11: Khi vt c c thnh dy mng chnh lch nhau nhiu th rnh dn phi t pha:

a-Thnh dy nht. b-Thnh mng nht. c-Thnh dy trung bnh d-Trn vt c ch thnh thp.

Cu 12: Lm khun bng my s dng khi:

a-Sn lng ln, vt c nh b-Sn lng nh, vt c n gin c-Sn lng ln , vt c n gin. d-Sn lng ln , vt c yu cu cht lng cao.

Cu 13: Khi vt c bng gang c thnh dy v mng khc nhau t th rnh dn t pha:

a-Thnh dy nht. b-Thnh mng nht. c-Ch cao nht ca vt c. d-Trn thnh thp nht ca vt c.

Cu 14: Sn khun c tc dng:

a-Lm mn mt vt c , tng tnh thng kh. b-Tng tnh chu nhit, tng tnh thng kh. c-Tng tnh chu nhit, lm mn mt vt c. d- Tng tnh chu nhit, tng bn ca khun.

Cu 15: Kch thc vt c bng:

a-Kch thc chi tit my + lng d gia cng + co kim lai. b-Kch thc chi tit my + co kim lai + dung sai c c- Kch thc chi tit my + co kim lai + lng d gia cng + dung sai c d- Kch thc chi tit my + lng d gia cng + dung sai c.

Cu 16: Kch thc mu c bng g bng:

a-Kch thc vt c + lng d gia cng + co kim lai. b- Kch thc chi tit my + lng d gia cng + co kim lai. c- Kch thc chi tit my + co kim lai + dung sai c d- Kch thc vt c + co kim lai.

Cu 17: Nguyn liu dng nu gang trong l ng gm:

a-Qung st + than cc + vi. b-Gang thi l cao + than cc + vi. c- Gang thi l cao + than a + gang vn + vi. d- Gang thi l cao + gang vn + than cc + vi.

Cu 18: Tnh lng chy hao cc nguyn t khi nu gang trong l ng nh sau:

a-Si-15%, Mn-15%, C-15%. b-Si-15%, Mn-20%, C khng chy. c-Si-20%, Mn-15%, C khng tnh. d-Si-15%, Mn-20%, C khng tnh.

Cu 19: Mt phn khun l:

a-Mt trn cng ca vt c . b-Mt chia vt c thnh 2 phn. c-Mt ngoi ca vt c. d-Mt tip xc gia khun trn v khun di.

Cu 20: Tc dng ca mu khi lm khun c:

a-To hnh dng bn ngoi ca vt c. b-To hnh dng bn trong ca vt c . c-To hnh dng vt c. d-To h thng rt.


3

Cu 21: V tr t u hi khi lm khun c:

a-Ch thp nht trong khun c. b-Ti mt phn khun. c-Ti thnh dy nht ca vt c d-Ti ch cao nht trong khun c.

Cu 22: Tc dng ca t u ngt:

a-Rt kim lai vo khun c . b-Dn kh trong lng khun that ra ngoi. c- b sung kim lai cho vt c khi kim lai ng c. d-Trnh nt vt c.

Cu 23: Dng cht tr dung khi nu kim lai mu c tc dng:

a-Bo v kim lai lng khng b oxy ha v d tch tp cht thnh x. b-Bo v kim lai lng khng b oxy ha. c-D tch tp cht thnh x. d-B sung mt s nguyn t kim lai b chy hao.

Cu 24: Tc dng ca sn mt mu g :

a-Chng m, lm trn mt mu. b-Lm mu ch th bit vt c l kim lai g. c-Ch chng m. d-Gm c a v b.

Cu 25: Mu bng kim lai s dng khi:

a-Vt c n gin. b-Lm khun bng my. c-Sn xut hng lat ln. d-Gm c a, b v c.

Cu 26: Kim lai ch to mu l:

a-Thp hoc gang xm. b-Hp kim nhm hoc gang xm. c-Hp kim nhm hoc hp kim ng . d-Ch c hp kim nhm.

Cu 27: Khi c bng khun ct, li ch to bng:

a-G. b-Kim lai. c-Hn hp ct l chnh. d-Thch cao. Cu 28: Khi c trong khun kim lai tnh, li ch to bng:

a-Hn hp ct. b-Kim lai. c-Gm a v b. d-Thch cao. Cu 29: V tr tng i gia rnh lc x v rnh dn phi:

a-Rnh dn cao hn v thng gc vi rnh lc x. b-Rnh dn thp hn v thng gc vi rnh lc x c-Rnh dn ngang bng v thng gc vi rnh lc x. d-Rnh dn phi thp hn v song song vi rnh lc x.

Cu 30: Lng tiu hao nhin liu hp l nht khi nu gang trong l c tnh theo t l nhin liu/gang nguyn liu:

a-Than cc - 15-20%, du F.O.- 25-30%, than - 25-30%. b-Than cc - 12-15%, du F.O.- 15-18%, than - 20-25%. c-Than cc - 12-15%, du F.O.- 25-30%, than - 25-30%. d-Than cc - 15-20%, du F.O.- 20-25%, than - 25-30%.

Cu 31: Khun ti l khun:

a-C nhiu nc. b-Khng sy. c-C m 10-15%. d-C m 3-5%.


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Cu 32: Cht sn khun gm:

a-Nc graphit hoc nc thy tinh. b-Nc ct thch anh hoc nc h tinh bt. c-Nc bt gch chu la hoc nc graphit. d-Nc bt thch anh hoc nc graphit.

Cu 33: Hnh v s 1 l:

a-Mu b-Hp li. c-Khun c. d-Hm khun.

Cu 34: Hnh v s 2 l: a-Mu.

b-Bn v chi tit my. c-Vt c . d-Hp li.

Cu35: Hnh v s 3 l: a-Mu.

b- Bn v chi tit my. c-Vt c . d-Hp li.

Cu 36: Trn hnh v s 4, cc b phn 1, 2 ,3,4 l:

a- ng rt, cc rt, rnh lc x, rnh dn. b- Cc rt, rnh lc x, ng rt, rnh dn. c- Cc rt, ng rt, rnh lc x, rnh dn. d- Cc rt, ng rt, rnh dn, rnh lc x.

Cu 37: Hnh v s 4 l: a-Vt c .

b-ng rt. c-Rnh lc x.

d-H thng rt. Cu 38: Hnh v s 5 l: a-Vt c v h thng rt.

b-Khun c . c-Mu c d-Vt c.

Cu 39: Hnh v s 6 l:

a-Vt c c u ngt ngm. b-Vt c c u ngt h. c-Vt c c h thng rt nhiu tng . d-Vt c c h thng rt kiu xi phng.

H.1

H.2

H.3

4 H.4

2 3

H.5

H.6


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Cu 40: Hnh 7 biu din nguyn cng no trong phng php lm khun trong 2 hm khun?

a. Lm khun di. b. Lp rp khun. c. Rt mu.

d. Lm khun trn. Cu 41: Hnh v s 8 l:

a- Vt c b-Chi tit my c-Li. d-Mu.

Cu 42: Hnh v s 9 l khun c c lm bng phng php:

a- c trong khun kim loi. b- Khun ct lm trong 2 hm khun. c- Khun ct lm trn nn xng. d- Khun bn vnh cu lm trn nn xng.

Cu 43: Hnh v s 10 l:

a-My lm khun kiu p t trn xung. b-My lm khun kiu p t di ln. c-My lm khun kiu rung(dn) d-My c p lc.


a-My lm khun kiu p t trn xung. b-My lm khun kiu p t di ln. c-My lm khun kiu rung(dn) d-My c p lc.


a-My c p lc. b-My lm khun kiu p t trn xung. c-My lm khun kiu dn (rung) d-My lm khun kiu va dn (rung) va p.

2

1

3 4

5

Hnh 7

H.8

H.9

H.10 H.11

10

5

1

2

3

9

H.12


6

H.14

Cu 46: Hnh v s 13a v 13b l:

a-My c p lc c bung p nng v p ngui. b- My c p lc c bung p ngui v p nng. c- My c p lc c bung p ngui thng ng v nm ngang. d-My lm khun.


a-inh ng hm khun. b-Dng c lm khun. c-Con m. d-Gi li.


a-Khun p nha. b-S my p thy lc c-S my c p lc. d-S my c lin tc c bung p nng.

Cu 49: Hnh v s 16 l nguyn l:

a-My lm khun. b-My c p lc. c-My lm li d-My c ly tm.

H.13b 4

H.13a

4 3

1

H.15

1

2

H.16


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Cu 50: nh v li trong khun c hnh 17, dng:

a. Gi li. b. Xng li. c. Con m. d. Gm a v c.


a- c pit tng bng khun ct. b-Khun c pittng bng p lc. c-c pit tng bng khun t st. d-Khun c kim loi tnh c pit tng.

Cu 52: Trn hnh v s 18, cc b phn 1,2,3,4,5,6,7 l:

a-Cht nh v tho lp nhanh ca khun kim loi. b- Cc chi tit lp ghp ca khun kim loi. c- Cc ming li lp ghp bng kim loi trong khun ct c

pittng. d- Cc ming li kim loi lp ghp trong khun kim loi c

pittng. Cu 53: Cho bentnit vo hn hp lm khun :

a-Tng dnh kt. b-Tng chu nhit . c-Tng thng kh. d-Tng c 3 tnh cht trn.

Cu 54: Khi rt kim lai lng vo khun, x c gi li cc b phn no?

a-Thng rt, cc rt, rnh lc x. b-Cc rt, ng rt, rnh dn. c-Thng rt, ng rt, rnh lc x. d-Cc rt, rnh lc x, rnh dn.

Cu 55: u ngt h t v tr:

a-Trn thnh dy nht ca vt c . b-Trn phn trung tm ca vt c . c-Trn thnh dy ca vt c v thng vi kh tri.

d-Trn thnh dy ca vt c v gn mt phn khun. Cu 56: Nhit rt kim loi lng vo khun ph thuc:

a-Thnh dy mng vt c. b-Thnh phn hp kim. c-Gm a v b. d-Nhit chy ca hp kim.

Cu 57: Khi nu gang bng l du F.O, gang d b bin trng hn so vi nu trong l ng v:

a-Du cha nhiu P, S. b-Nhit cao hn nn C chy mnh hn. c-Trong gang lng cha y l khng c than cc nh trong l ng. d-Thi gian nu di hn nn C b chy nhiu hn.

H.17

H.18

2 1 3

A A

4

7

5 6

A - A


8

Cu 58: H thng rt trong khun c c t theo th t cc b phn sau:

a-Cc rt, rnh lc x, ng rt, rnh dn. b-Cc rt, ng rt, rnh lc x, rnh dn. c-ng rt, cc rt, rnh dn, rnh lc x. d-ng rt, cc rt, rnh lc x, rnh dn.

Cu 59: Lm khun di bng my th chn cch rt mu thch hp bng:

a. Thanh y (Cht y). b.Bn quay. c. Bn lt. d. Cu b,c u ng.

Cu 60: Khi nu gang trong l ng, cho thm vi (CaCO3) vo nguyn liu l :

a-Lm gim nhit nng chy ca gang. b-Lm tng chy long ca gang. c-Lm tng chy long ca x. d-Lm tng nhit ra l ca gang lng.

Cu 61: Khi nu gang trong l du ngi ta dng cht tr dung l:

a- vi. b-FeSi. c-FeMn. d-Khng cn dng. Cu 62: Tc dng ca t st trong hn hp lm khun l:

a-Tng bn, gim thng kh. b-Tng bn, tng thng kh. c-Tng do, tng thng kh. d-Gim do, gim thng kh.

Cu 63: Con m c ch to bng:

a-G chu nc. b-Thp cacbon. c-ng thau. d-Vt liu ging kim lai vt c.

Cu 64: bin tnh v kh kh cho gang lng, ngi ta thng dng:

a-Fer silic b-Fer mangan c-Silic nguyn cht d-Fer vnfram

Cu 65: Nhit gang lng khi rt khun tt nht l:

a-1150 1200oC b-1250 - 1300oC c-1350 1400oC d-1450 1500oC

Cu 66: gim hin tng bin trng gang, ngi ta cho thm vo l gang:

a-Fer mangan b-Fer silic c-ng nguyn cht d-Fer crm. Cu 67: Phng php lm khun khng hm s dng khi:

a-Sn xut vt c nh v khng quan trng b-Sn xut n chic c-Sn xut hng lot nh d-Sn xut hng lot ln

Cu 68: nu ng, trong cc xng c ngi ta dng cc ni cha bng:

a-Gang xm b-Gch chu la c-t st d-Grapht Cu 69: Hnh dng v kch thc mu c c g khc so vi vt c?

a. Gc thot khun v dung sai c. b. Tai mu v co kim loi. c. Tai mu v lng d giacng. d- Gc c v co kim loi. Cu 70: Khi nu hp kim ng, ngi ta dng cht g kh xy?

a. Cu-Mg b. Cu-P c. Pht pho. d. Mg.


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Cu 71: Khi c vt c ln, ngi ta thng chn ct ht to :

a. Tng tnh bn nhit. b. Tng tnh ln (co bp). c. Tng tnh thng kh. d. Gm cu a v c.

Cu 72: Khi lm khun bng my, nguyn cng rt mu bng thanh (cht) y thch hp cho lm:

a. Khun di. b. Khun trn. c. Cu a v b u ng. d. Khun ln.

Cu 73: Khi c nhng hp kim co nhiu, trnh lm co ngi ta thng lm khun c:

a. u hi. b. Rnh thng kh. c. u ngt. d. Kch thc ln hn vt c.

Cu 74: Bin php no c th khc phc s bin trng khi c gang xm:

a. Tng nhit nc gang ra l. b. Bin tnh gang bng FeSi c. c trong khun kim loi. d. Cho FeMn vo l nu. Cu 75: Bin php chng chy dnh ct bm ln b mt vt c bng gang:

a.Trn thm t st vo hn hp lm khun. b.Dng ct m c c ht ln hn. c. Dng ct m c c ht nh hn.

d. Qut ln b mt khun c mt lp bt than. Cu 76: Hng kt tinh ca kim loi lng trong khun c:

a. T ngoi vo trong v t trn xung. b. T trong ra ngoi v t di ln. c. T trong ra ngoi v t trn xung. d. T ngoi vo trong v t di ln.

Cu 77: Khi c ra gang b mm (nhiu C v Si), c tnh thp, bin php khc phc trong nu luyn l:

a. Tng nhit nc gang ra l. b. Bin tnh gang lng bng FeSi trong trong thng rt. c. Cho thm FeSi vo l nu. d. Cho thm FeMn vo l nu.

Cu 78: Phng php c trong khun mu chy t c chnh xc cao v:

a. Vt c khng c mt phn khun. b. Khi lm khun khng phi rt mu. c. Cu a v b u ng. d. Mu bng vt liu d chy.

Cu 79: Khi lm khun trn nn xng, nh v khun trn vi khun di, ngi ta dng:

a. Bu lng. b. Vt nng ln khun trn. c. Cht nm. d. Cu a, c u ng.

Cu 80: Khi lm khun ct, hnh thnh lng khun c ngi ta thng dng: a. Mu. b. Hp li. c. Li. d. Hm khun Cu 81: Tc dng ca li khi t trong khun c:

a-To hnh dng bn ngoi ca vt c. b-To hnh dng bn trong ca vt c . c-To hnh dng vt c. d-To h thng rt.


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Cu 82: Khi nu v rt c hp kim nhm, ngi ta hn ch khuy ng hp kim lng :

a. Gim s chy hao v xyha nhm. b. Trnh ha tan xy trong nhm. c. Trnh r kh vt c. d. Cu a, b, c u ng.

Cu 83: Khi c gang trong khun ct, cht sn khun c thnh phn c bn l:

a. SiO2. b. Bt grapht. c. Sunfit kim (nc b giy). d. Nc thy tinh.

Cu 84: c trong khun kim loi, sn khun c tc dng:

a- iu chnh tc dn nhit ca thnh khun. b- Tng tui th cho khun c- Bi trn d ly vt c. d- Gm c a,b,c.

Cu 85: V tr t u ngt khi lm khun c:

a- Ti b mt phn khun. b-Ti thnh mng nht ca vt c. c-Ti thnh dy nht ca vt c. d-Ti ch cao nht trong khun c. Cu 86: Tnh lng chy hao cc nguyn t khi nu gang trong l ng nh sau:

a-Si-15%, Mn-20%, C-15%. b-Si-15%, Mn-20%, C khng chy. c-Si-20%, Mn-15%, C khng tnh. d-Si-15%, Mn-20%, C khng tnh.

Cu 87: Khi c kim loi, trnh hin tng vt c b ht kch thc th lng khun phi ln hn vt c:

a- co kim loi. b-Dung sai c. c- Lng d gia cng. d- Gm c b v c. Cu 88: Li (Rut) bng hn hp ct trc khi lp rp vi khun c th phi qua: a- Sy kh. b- Khng cn sy. c-Cu a v d u ng. d- Sy kh b mt. Cu 89: c trong khun kim loi, phi sn khun bng: a- Lp sn lt. b- Sn ph mt. c- Khng cn sn khun . d- Gm cu a v b. Cu 90: H thng rt trong khun c hnh 19 c dng: a- Rt t trn xung. b- Rt t di ln. c- Rt vo thnh bn (bn hng). d- Rt kt hp t trn xung v rt vo thnh bn. Cu 91: nh ng mu khi lm khun c tc dng:

a- tng kch thc lng khun b vo lng co ngt kim loi khi ng c. b- thnh khun st cht. c- d ly mu ra khi khun.

d- d lp rp li vo khun.

H.19


11

Cu 92: Hnh 20 biu din nguyn cng no trong phng php lm khun trong 2 hm khun?

a. Lm khun di. b. Lp rp khun, li. c. Rt mu.

d. Lm khun trn. Cu 93: H thng rt trong khun c hnh 21 c dng: a- Rt t trn xung. b- Rt t di ln. c- Rt vo thnh bn (bn hng). d- Rt kt hp t trn xung v rt vo thnh bn. Cu 94: Cho bit tn cc b phn ca b khun c trn hnh 21: 1:............................2:................................ 3:.............................4:................................

5:.............................6:............................... Cu 95: Khi nu hp kim ng, dng ng pht pho cho vo hp kim lng c tc dng:.................................. Cu 96: c kim loi l:................................ Cu 97: Trong thit k c, phi xc nh mt phn khun :.......... Cu 98: Trong c, thun li khng cn tnh co vo kch thc mu trn bn v ngi ta dng.................... o mu. Cu 99: Phng php c p lc l:........... Cu 100: Phng php c ly tm l:........... Cu 101: Phng php c trong khun v mng l:........... Cu 102: Phng php c mu chy l:........... Cu 103: Ti sao ni phng php c trong khun kim loi, vt c c c tnh cao hn c trong khun ct?............................................. Cu 104: Trong cng ngh c, dng nc thy tinh trn vi ct (SiO2) lm khun c phi c............. ng rn. Cu 105: im: 1.5 Thang im: 10 Thi gian: 10 pht Ni dung cu hi: V KHUN C ngay trn bn v chi tit hnh 22 di y: Cho bit sn xut hng lot, khng biu din kch thc, lng d gia cng t m, v gc thot khun, li v gi li, nh v khun, thng kh cho khun, h thng rt, u hi, mt phn khun.

6

10

11

7

e)

H.20

1

2

3 4

5

6 H.21


12

Cu 106: Da vo khun c v cu 105 tnh Hp. Cho bit chiu cao khun trn =80mm v cng thc:

(B qua lng d gia cng, co kim loi) ...................................................................................................................................

Cu 107: im: 1.5 Thang im: 10 Thi gian: 10 pht Ni dung cu hi: Thit k bn v C ngay trn bn v chi tit di y: Cho bit sn xut hng lot, lng d gia cng b mt RZ10 l 4mm, b mt RZ20 l 3mm, dung sai1mm.

CPHH p 2

2

=

H.22 Tay bin GX 15-32


13

Cu 108: So snh dp ct v t l:

a- Ging nhau nguyn l ct dng b khun ct gm chy v ci c cnh sc. b- Khc nhau cng dng ca ming ct. c- Khc nhau nguyn l ct dng b khun ct gm chy v ci c cnh sc.

d- Gm cu a v b. Cu 109: Gia cng nng l:

a-Bin dng kim loi nhit cao. b-Bin dng c nung nng kim loi. c-Bin dng nhit cao hn nhit kt tinh li. d-Bin dng nhit cao hn ng Ac1.

Cu 110: Khi bin dng ngui kim loi b bin cng do: a-Nng lng nguyn t tng lm tng tnh chng bin dng. b-Kh nng dch chuyn ca kim loi gim. c- cng ca kim loi tng. d-X lch mng trong kim loi gim. Cu 111: nh lut th tch khng i dng tnh: a-Kch thc ca vt rn. b-Hnh dng ca phi. c-Kch thc ca phi. d-Hnh dng ca vt rn. Cu 112: nh lut tr lc b nht dng tnh: a-Kh nng chu lc ca kim loi. b-Hnh dng ca phi. c-Hnh dng ca vt rn. d-Lc tc dng ln nht ca my. Cu 113: chnh xc ca my khi gia cng p lc ph thuc: a-Lc tc dng chnh. b-Phn lc. c-Lc qun tnh. d-C 3 loi lc trn. Cu 114: Khi bin dng ngui, nu tng tc bin dng lm cho:

a-Tnh do ca kim loi tng. b-Tnh do ca kim loi gim. c-Mt ca kim lai tng. d- chnh xc kch thc ca sn phm gim.

Cu 115: Khi rn iu chnh lc p ca ba hi bng: a-Khi lng phn ri. b-Lng kh nn. c-Tc quay ca ng c. d-Ma st gia ai v puli. Cu 116: Cng thc GF = Gvr + Gch + Gcb dng tnh: a-Kch thc vt rn t do. b-Khi lng vt rn t do. c-Khi lng phi rn t do. d-Khi lng phi rn khun. Cu 117: Cng thc GF = Gvr + Gch + Gvb + Gcht dng tnh: a-Kch thc vt rn khun. b-Kch thc vt rn t do. c-Khi lng phi rn t do. d-Khi lng phi rn khun.


14

Cu 118: My p ma st trc vt dng : a-Rn t do. b-Rn khun v dp tm. c-Rn t do v rn khun. d-Rn t do, rn khun v dp tm. Cu 119: My p trc khuu dng : a-Rn khun v dp tm. b-Rn t do v ct phi tm c-Rn t do v rn khun. d-Ch dp tm v ct phi tm. Cu 120: My p trc khuu 2 tc dng c tc dng: a-Bin dng v y phi. b-Bin dng v chn phi. c-Bin dng v ct phi. d-Ct phi v y phi. Cu 121: Cng thc: a-Tnh s khun dp tm c lm mng thnh phi. b-Tnh s ln dp tm khng lm mng thnh phi. c-Tnh s ln dp tm c lm mng thnh phi. d-Tnh s ln ko dy. Cu 122: Cng thc P= Kn .dn.S.b dng tnh: a-Lc chn phi. b-Lc ct phi tm. c-Lc rn khun. d-Lc bin dng khi dp phi tm. Cu 123: Cng thc Z= K.S+ Smax dng tnh: a-Lc ct phi. c-Khe h gia khun v chy khi ct phi tm. b-Lc chn phi. d-Khe h gia khun v chy khi bin dng phi tm. Cu 124: Cng thc P = KBSc dng tnh: a-Lc ct phi tm bng khun. b-Lc bin dng phi tm. c-Lc ct phi tm bng dao nghing. d-Lc ct phi tm bng dao song song. Cu 125: Trong cng thc tnh lc ct phi tm di y thiu yu t no: P = KLct . a- b- B c- S d- D. Cu 126: u im ni bt ca my p thy lc l: a-To lc ng v lc ln. b-To lc tnh v lc ln. c-To lc ln v lc qun tnh nh. d-Lc qun tnh nh v lc khng i trong sut hnh trnh. Cu 127: Khi gia cng p lc trn my p trc khuu iu chnh lng bin dng ca kim loi bng: a-Chiu di hnh trnh ca u p. b-Tc quay ca trc khuu. c-Chiu cao ca bn my. d- su ca lng khun.

tb

n

mDmdn

lg)lg(lg1 1+=


15

Cu 128: Khun h l khun: a-Gia 2 thn khun c khe h. b-Gia 2 thn khun c rnh vnh bin. c-Mt phn khun song song vi phng ca lc tc dng. d -Lng khun l ra ngoi. Cu 129: Khi gia cng p lc, lc ma st c tc dng: a-Lm gim bin dng. b-Lm tng bin dng. c-Khng nh hng n bin dng. d-Lm tng hoc gim bin dng. Cu 130: Khi cn kim loi nu gi l gc n, l gc ma st th d cn cn phi a-Tng , tng . b-Tng , gim . c-Gim , gim . d-Gim , tng . Cu 131: Cng thc sau dng : a-Tnh s ln dp tm khng lm mng thnh phi. b-Tnh s ln ko dy. c-Tnh s ln dp tm c lm mng thnh phi. d-Tnh h s s dng kim loi hp l khi xp phi tm. Cu 132: Trong cng thc l a-Gc ma st khi cn.

b-Gc n khi cn c-Gc ma st khi ko

d-Mt na gc nghing ca vng bin dng khun ko. Cu 133: Mun un ngui tm thp c gc un l 90o, th khun un phi c gc l: a. 90o b. >90o c.


16

c-T s gia ng knh phi sau v trc khi dp d- T s gia ng knh ca sn phm v ng knh phi. Cu 137: Lc dp su khng lm mng thnh phi l: a-Lc bin dng chi tit. b-Lc ct phi v lc bin dng chi tit. c-Lc chn phi. d-Lc bin dng chi tit v lc chn phi. Cu 138: Cc kim loi Cu, Zn, Al ln lt c nhit nng chy l 1083oC, 419oC, 660oC, khi gia cng nhit trong phng th kim lai no l gia cng nng? a-Cu. b-Zn. c-Al. d-Tt c l gia cng nng. Cu 139: Khi mun un mt tm kim loi bng khun c bn knh un cong ca khun un l r=2cm, nhng sau khi un o li bn knh un cong ca sn phm l r=2,2cm. Vy hin tng do nh lut no chi phi khi gia cng p lc? a-nh lut tr lc b nht. b-nh lut tn ti ng sut d. c-nh lut bin dng n hi tn ti ng thi vi bin dng do. d-nh lut th tch khng i. Cu 140: Hnh 23 l s ng ca: a-My ba hi chu k n. b-My ba hi chu k kp c-My dp trc khuu 1 tc dng. d-My dp trc khuu 2 tc dng. Cu 141: Hnh 24 l s ng ca: a-My ba hi. b-My p thy lc. c-My p ma st kiu trc vt. d-My p trc khuu. Cu 142: Hnh 25 l hnh dng bn ngoi ca: a-My p thy lc b-My ba hi c-My p ma st trc vt d-My p trc khuu.

H.23

H.24

H.25


17

Cu 143: Trn hnh 26 l b khun lin hp dp vng m, b phn s 8, 9 l: a-Chy dp ct v chy t l. b-Chy t l v chy dp ct. c- Chy dp ct v chy dp to hnh. d- Chy t l v chy dp to hnh. Cu 144: Hnh 27 l s ng ca: a-My p thy lc b-My p ma st kiu trc vt c-My p trc khuu. d-My ba hi. Cu 145: Hnh 28 l s nguyn l ca: a-My p thy lc. b-My ba hi nc rn khun. c-My p trc khuu. d-My ba hi.

Cu 146: Hnh 29 l s ng ca: a-My ba hi nc b-My ba hi ng c in. c-My p thy lc d-My p trc khuu Cu 147: Trn hnh 30 b phn s 3 l: a-Chy dp. b-Tm chn. c-Khun dp. d-Phi. Cu 148: Khe h Z gia chy v ci dp khng lm mng thnh phi, nu ly qu ln th sn phm dp s b: a. B t y. b. B nhn thnh bn. c. B bin mng thnh. d. Gm c a,b,c.

H.26

H.27

H.29

H.30

H.28


18

Cu 149: Hnh 31 l s nguyn l: a- Dp khng lm mng thnh phi. b- Dp c lm mng thnh phi. c- Dp ct. d- t l. Cu 150: Hnh 32 l s nguyn l ca: a-My p thy lc. b-My dp trc khuu. c-My dp trc khuu 1 tc dng. d-My dp trc khuu 2 tc dng. Cu 151: Trn hnh v 32 b phn s 1 l: a-u trt ngoi chn phi. b- u trt trong chn phi. c- u trt ngoi dp phi. d- u trt trong dp phi. Cu 152: Trn hnh v 32 b phn s 2 l: a-u trt ngoi chn phi. b- u trt trong chn phi. c- u trt ngoi dp phi. d- u trt trong dp phi. Cu 153: Hnh v s 33 l: a-My lm khun c. b-Khun rn. c-Khun dp nhiu nguyn cng (lin hp). d-Khun dp 1 nguyn cng (n). Cu 154: Hnh v s 34 l: a-Khun c bng kim loi. b-Khun rn lng khun h. c-Khun rn lng khun kn. d-Khun dp tm. Cu 155: Trn hnh v 34, b phn s 2 l: a-Lng khun c bng kim lai. b-Lng khun rn. c- Lng khun rn kn. d-Rnh vnh bin (rnh ba via).

H.31

H.32 1 2

H.33

8 9 10 11 12

H.34


19

Cu 156: Hnh v s 35 l: a-Khun rn 1 thn khun . b-Khun rn lng khun h. c-Khun rn lng khun kn. d-Khun dp kim loi tm. Cu 157: Hot ng ca h thng van trn my ba hi hnh 36a v 36b l ang lm vic trng thi: a-Khng ti-p lin tc. b-Ba treo-Ba p. c- p lin tc- Ba p. d. Khng ti- Ba treo. Cu 158: Khun un ngui c gc un l 90o, th tm thp dy 0,5mm sau khi un c gc l: a. 90o b. < 90o c. 90o d. > 90o Cu 159: Gi S l chiu dy tm kim loi, Z l khe h gia chy v khun ct, khi ct ng tm ly Z bng:

a-(0,1-0,2)S b-(0,5-0,6)S c-(0,01-0,02)S d-(0,05-0,06)S

Cu 160: Khi rn khun , tnh lng chy hao kim loi khi nung nng bng:

a-(1 2)%GF b-(34)%GVR c-(57)%GF d-(78)%GVR

Cu 161: Nung thp giai on nhit cao(>8500C) gia cng p lc th tc nung nn chn:

a- Nung chm. b- Nung nhanh. c. Tc nung cho php. d- Bt k. Cu 162: Ch to khun c vnh bin i vi: a-Khun rn s b. b-Khun kn rn kt thc. c-Khun c 2 thn khun. d-Khun h rn kt thc. Cu 163: Khi sn phm l hnh tr thnh bn bc, c y, c vnh th phi dp tm c hnh: a-Trn. b-Vung. c-Elp. d- 8 cnh Cu 164: Khi sn phm l hp c y ch nht, cnh y ln v nh l A v B, chiu cao H=0,2B th phi dp tm c hnh: a-Trn. b-Ch nht. c-Elp. d- 8 cnh. Cu 165: Khi sn phm l hp c y ch nht, cnh y ln v nh l A v B, chiu cao H=0,6B th phi dp tm c hnh: a-Trn. b-Ch nht. c-Elp. d- 8 cnh.

H.35

a) b)

Hnh 36


20

Cu 166: So snh chnh xc v kch thc gia cng gia 4 loi my sau theo chiu chnh xc gim dn: 1-My p trc khuu; 2-My p thy lc; 3-My p ma st trc vt; 4-My ba hi. a-1234. b-2314. c-4321. d-1342. Cu 167: Trn hnh 37 l gia cng theo phng php: a-Dp tm c lm mng thnh phi dng tm chn. b-Dp tm khng lm mng thnh phi dng tm chn. c- Dp tm lm mng thnh phi. d-Dp khi bng khun h. Cu 168: Gi Z l khe h gia chy v ci ct, n ph thuc vo:

a. Chiu dy tm kim loi. b. Tnh cht vt liu ct c. Gm a v b. d. Tnh cht vt liu khun ct. Cu 169: Khi nung thp n gn nhit qu nhit (nhit rn cao nht), nu lm bin dng vi tc bin dng ln th: a.Lm tng tnh do kim loi. b. Lm gim tnh do. c.Khng nh hng n tnh do. d. Cu a v b u ng. Cu 170: Trong 9 trng thi ng sut hnh di y, th trng thi ng sut no sau y lm kim loi c tnh do km nht v cao nht: a. K1 M3 b. K2 K4 c. 1 2 d. K1 K4

K1 K2 K3 K4 M1 M2 M3 1 2 Cu 171: Trn hnh 38 l b khun dp theo phng php: a-Ct v dp kim loi tm. b-Dp tm c lm mng thnh phi. c-Dp n. d-Ct v t lin hp kim loi tm. Cu 172: Khi dp khng lm mng thnh phi, tnh lc p ph Q tc dng ln tm chn phi nhm mc ch: a.Trnh t y sn phm dp. b. Gim s bin mng thnh. c. Trnh hin tng np nhn thnh bn. d. Gm c a,b,c.

Cu 173: Cng thc

tgSKP c

2

= dng tnh:

a-Lc ko dy. b-Lc dp phi tm. c-Lc ct phi tm trn my ct dao nghing. d-Lc ct phi tm trn my ct dao song song.

H.37

H.38


21

Cu 174: Khun ct kim loi tm c li ct l gc vung s dng khi: a-Sn xut hng lot ln b-Sn xut hng lot nh c-Phi c chiu dy ln d-Phi c chiu dy mng Cu 175: Chi tit phi dp vut nhiu ln th h s dp vut m1, m2, mn nn chn: a. Tng dn. b. Gim dn. c. Bng nhau. d. C a, b, c u ng. Cu 176: Lng bin dng ti hn l: a-Lng bin dng cn thit ti thiu khi gia cng p lc. b-Lng bin dng cn thit ti a khi gia cng p lc. c-Lng bin dng phi trnh khi gia cng p lc v s cho ht ln nht sau khi gia cng. d-Lng bin dng tt nht khi gia cng p lc v s cho ht nh sau khi gia cng. Cu 177: Hn h quang l phng php:

a-Hn in b-Hn nng chy c-Hn p lc d-Hn x in Cu 178: Hn in tip xc hai tm kim loi mng vi nhau thng to: a-Mi hn gip mi b-Mi hn un mp

c-Mi hn chng d-Mi hn gc Cu 179: Hn in ni nghch khi:

a-Hn in mt chiu b-Hn in xoay chiu c-Hn in tip xc d-Hn x in

Cu 180: Hn in tip xc gip mi dng hn:

a-2 vt dy c chiu dy ging nhau. b-2 vt mng c chiu dy ging nhau. c-2 vt dy c chiu dy ging hoc khc nhau. d-2 vt cng vt liu nh nhau.

Cu 181: Nguyn tc s dng m hn ht khi hn v khi thi hn:

a- M C2H2 trc; ng O2 sau b- M O2 trc; ng C2H2 trc. c- M O2 trc; ng C2H2 sau. d- M O2 trc; ng O2 trc.

Cu 182: Que hn nng chy c lp thuc bc s dng khi:

a-Hn t ng di lp thuc b-Hn x in c-Hn h quang tay d-Hn trong chn khng

Cu 183: Que hn khng nng chy s dng khi:

a-Hn h quang tay. b-Hn in tip xc. c-Hn MIG. d-Hn kh. Cu 184: Cng thc d= S/2 dng tnh:

a-Chiu dy vt hn khi hn tip xc b-ng knh que hn khi hn h quang

c-ng knh que hn khi hn kh di chuyn phi d-ng knh que hn khi hn kh di chuyn tri


22

Cu 185: Cng thc Ih= (+.dq).dq dng tnh cng dng in hn khi:

a-Hn h quang tay b-Hn t ng di lp thuc c-Hn bn t ng d-Hn in tip xc gip mi

Cu 186: Khi hn h quang tay v tr hn ng, dng in hn so vi hn sp phi

a-Tng 15-20% b-Gim 15-20% c-Gim 20-25% d-Gim 10-15% Cu 187: Khi hn kh, p sut oxy m hn phi iu chnh trong khong:

a- 0,81 at. b- 12at c- 35 at. d- 810 at. Cu 188: Khi hn kh, p sut kh C2H2 m hn phi iu chnh trong khong: a- 0,10,2 at. b- 0,30,5 at c- 0,81,0 at. d-34 at.

Cu 189: Nu gi 22

2

HC

O

VV

n = th t l no di y l ng nht

a-n= 0,9 1,0 khi dng ngn la bnh thng b-n= 1,1 1,2 khi dng ngn la bnh thng c-n= 1,1 1,2 khi dng ngn la ccbon ha d-n= 1,0 1,1 khi dng ngn la oxy ha

Cu 190: Thp khng r crm khng ct c bng ngn la O2 -C2H2 v :

a-Nhit nng chy ca thp khng r qu cao. b-H s dn nhit ca thp qu ln. c-Nhit nng chy ca Cr23 to thnh cao hn nhit nng chy ca thp khng r.

d-Nhit nng chy ca Cr2O3 to thnh cao hn nhit nng chy ca Fe2O3 Cu 191: Trong vng nh hng nhit ca vt hn th vng kim loi no c ht ln, do v dai va p gim: a-Vng gin xanh. b-Vng thng ha. c-Vng qu nhit. d- Vng kim loi chy khng hon ton. Cu 192: Phng php hn t gy ng sut v bin dng nht l: a-Hn in h quang tay. b-Hn kh O2-C2H2 c-Hn in tip xc. d-Hn h quang t ng. Cu 193: Hn in h quang tay vi my hn 1 chiu c u im hn my xoay chiu ch:

a-Gn, nh, d vn chuyn b-D bo qun v sa cha c-Cht lng mi hn cao hn d-C 3 trng hp trn

Cu 194: Trong hn in h quang tay,loi mi hn vt mp hnh ch V c s dng khi chi tit c chiu dy S a-S = 210 mm b-S = 426 mm c-S= 410 mm d-S= 1020 mm Cu 195: Khi hn bng O2 - C2H2, nu ta s dng xy v axtylen trong cc bnh cha sn th nhng thit b cn c hn c bao gm: a-Bnh iu ch axtylen, van gim p, dy dn, cn v m hn. b-Kha bo him, van gim p, dy dn, cn v m hn. c-Kha bo him, dy dn , cn v m hn d-Van gim p, dy dn, cn v m hn.


23

Cu 196: So vi phng php hn in h quang, hn kh c u im hn: a-C th hn nhng chi tit c chiu dy mng b-Khng ph thuc vo ngun in c hay khng c-C nhiu cng dng hn d-C 3 trng hp trn Cu 197: Cng sut ngn la trong phng php hn kh c tnh da vo:

a-Cng sut ca hn hp kh chy b-Cng sut ca axtylen

c-Cng sut ca oxy d-Cng sut ca2

222 HCO +

Cu 198: in th h quang hn ph thuc: a- Cng dng in hn. b- ng knh que hn.

c- Chiu di ct h quang. d- Chiu dy vt hn. Cu 199: Hn h quang ni in gin tip khi

a-Hn h quang tay in cc nng chy b-Hn h quang tay in cc khng nng chy c-Hn h quang tay dng in 1 chiu d-Hn bn t ng

Cu 200: Hn t ng di lp thuc (SAW) l phng php hn: a-Dng que hn nng chy c thuc bc. b-Dng dy hn khng nng chy v thuc bt ph ng hn. c-Dng dy hn nng chy v thuc bt ph ng hn. d-Dng dy hn c thuc bc v dng kh bo v ng hn.

A - Ac. Tai mu v lng d giacng. d- Gc c v co kim loi.Khi nu hp kim ng, ngi ta dng cht g kh xy?a-Rn t do. b-Rn khun v dp tm.c-Rn t do v rn khun. d-Rn t do, rn khun v dp tm.My p trc khuu dng :a-Rn khun v dp tm. b-Rn t do v ct phi tmc-Rn t do v rn khun. d-Ch dp tm v ct phi tm.My p trc khuu 2 tc dng c tc dng:a-Bin dng v y phi. b-Bin dng v chn phi.c-Bin dng v ct phi. d-Ct phi v y phi.

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