Ky thuat nhiet - 1132030

Tn hc phn: Ky thut nhit M hc phn: 1232030 S VHT: 03 Trnh o to: ai hoc chinh qui A - NGN HNG CU HI KIM TRA NH GI TRC NGHIM KHCH QUAN Chng 1:

1. Cc ni dung kin thc ti thiu m sinh vin phi nm vng sau khi hc xong chng 11. - Hiu c cac khai nim, inh nghia v: H c lp, h khng c lp, h kin, h h, h oan nhit, cht mi gii, nhit , ap sut, th tich ring, ni nng, enthalpy, entropy, khi ly tng va khi thc. 2. - Hiu va vn dung c cng thc cua phng trinh trang thai: Khi ly tng Khi thc

1. Cc mc tiu kim tra nh gi v dng cu hi kim tra nh gi gi chng 1Stt 1 2 3 Ni dung Dng cu hi H c lp, h khng c Cu hi nhiu la chn Mc Nh c cc kin thc lp, h kn, h h, h mc 1 on nhit. Mc Hiu c cc kin thc Cc thng s trng thi, Cu hi nhiu la chn hc mc 1 phng trnh trng thi. Phng trnh trng thi Cu hi nhiu la chn Kh nng vn dng cc kin thc kh l tng. Phng hc mc 1 trnh trng thi kh thc Phn tch bi ton a Cu hi nhiu la chn Kh nng phn tch v phng trnh trng thi kh l tng Cc loi bi ton tm th Cu hi nhiu la chn Kh nng tng hp: tch ring, p sut, nhit So snh kh thc v kh Cu hi nhiu la chn Kh nng so snh, nh gi: l tng. Mc tiu kim tra nh gi

4

5 6

3. Ngn hng cu hi v p n chi tit chng 1tt 1 Cu hi v p n p n (trng s im) D (1)

H thng nhit ng hc l tp hp tt c cc vt th: A/ Lin quan vi nhau v c nng. B/ Lin quan vi nhau v nhit nng. C/ Lin quan vi nhau v c nng v nhit nng. D/ Lin quan vi nhau v c nng v nhit nng m ta ang nghin cu bng phng php nhit ng hc. 2 H c kh nng trao i vt cht vi mi trng xung quanh l: A/ H h v h c lp. B/ H khng c lp v h kn. C/ H on nhit v h kn. D/ H h hoc khng c lp. 3 Cht mi gii hay c s dng l kh hoc hi v c bin thin th tch theo nhit : A/ Va phi. B/ Nh C/ Tng i ln. D/ Ln. 4 Nhit Xenxit (Celcius) t c tnh theo nhit Fa-ren-hai (Fahrenheit) tF theo cng thc: A/ t=1,8*tF + 32. B/ t=5*( tF + 32)/9. C/ t=5/9*tF +32. D/ t=5*(tF - 32)/9. 5 1 at k thut bng:

D (1)

D (1)

D (1)

D

6

7

8

9

10

A/ 1 kG/cm2. B/ 1 kgf/cm2. C/ 10 m H2O. D/ 3 p n cn li u ng. 1 at k thut bng: A/ 730 mmHg; B/ 735 mmHg; C/ 740 mmHg; D/ 750 mmHg. Ct p 1 mH2O bng: A/ 9,8 Pa; B/ 9,8 kPa; C/ 1 at; D/ 1 bar. n v o p sut chun l: A/ Pa. B/ at. C/ mm H2O. D/ mm Hg. 1 psi quy ra bar bng: A/ 0,069 B/ 0,070 C/ 0,071 D/ 0,072 Khi o p sut bng chiu cao ct thu ngn nhit t phi quy v 0oC theo cng thc: A/ B/ C/ ; ; ;

(1)

B (1)

B (1)

C (1)

A (1)

C (1)

D/ ; 11 Ap sut ca kh thc so vi p sut ca kh l tng khi c cng nhit v th tch co dn c : A/ Cao hn. B/ Thp hn. C/ Khi cao hn, khi thp hn ty theo nhit . D/ Khi cao hn, khi thp hn ty theo mi cht. 12 n v o chun ca th tch ring l:

B (1)

B (1)

A/

B/ C/

D/ 13 n v tnh ca ni nng U l: A/ J, kJ B/ W, kW C/ kW.h D/ kW/h 14 Enthalpy H l: A/ Tng ng nng v th nng ca vt. B/ L nng lng ton phn ca vt. C/ L thng s trng thi ca vt. D/ C 3 p n cn li u ng. 15 Entropy S c n v o l:

A (1)

D (1)

C (1)

A/ B/ C/ .

D/ 16 Phng trnh trng thi ca kh l tng: A/ B/ C/ 17 . . .

D (1)

D/ ; Phng trnh trng thi ca kh thc (phng trnh Van Der Waals) A/ B/ C/ ; ; ; ;

C (1)

D/ 18 Hng s ph bin cht kh: A/ B/ C/ ; ;

C (1)

19

20

21

22

D/ ; i vi kh l tng th cc i lng nhit , ni nng, enthalpy c: A/ Nhit , ni nng l c lp tuyn tnh. B/ Ni nng, enthalpy l c lp tuyn tnh. C/ Enthalpy, nhit l c lp tuyn tnh. D/ Nhit , ni nng, enthalpy l 3 i lng ph thuc tuyn tnh vi nhau. Kh N2 iu kin nhit 250oC; p sut d 45bar. Bit p sut kh quyn l 1 bar. Th tch ring (lit/kg) bng: A/ 0,0890 B/ 33,769 C/ 0,0594 D/ 0,0337 Kh O2 iu kin nhit 25oC; p sut d 10bar. Bit p sut kh quyn l 1 bar. Th tch ring (lt/kg) bng: A/ 0,0704 B/ 8,309 C/ 70,421 D/ 83,088 Kh CO2 iu kin nhit 40oC; p sut d 40bar. Bit p sut kh quyn l 1 bar. Th tch ring (lit/kg) bng: A/ 0,890 B/ 0,704 C/ 14,432

D (1)

B (2)

C (2)

C (2)

D/ 0,594 23 Khng kh iu kin nhit 50oC; p sut d 7bar. Bit p sut kh quyn l 1 D bar. Th tch ring (lit/kg) bng: (2) A/ 1,289 B/ 131,081 C/ 95,492 D/ 115,8 Chng 2: 1. Cc ni dung kin thc ti thiu m sinh vin phi nm vng sau khi hc xong chng 2 1.1 - Hiu c cac khai nim, inh nghia v: Nhit dung v nhit dung ring, nhit lng, cng. 1.2 - Hiu va vn dung c: Cng thc tnh nhit dung ring thc, cch tnh nhit lng v cch tnh cng, cng thc nh lt 1. 2. Cc mc tiu kim tra nh gi v dng cu hi kim tra nh gi gi chng 2 Stt Mc tiu kim tra nh gi Ni dung Dng cu hi Nhit dung v nhit Cu hi nhiu la chn Mc Nh c cc kin thc dung ring, nhit lng, 1 mc 1 cng, nh lut 1 nhit ng hc. Cch tnh nhit dung Cu hi nhiu la chn ring, cch tnh cng, Mc Hiu c cc kin thc 2 cch tnh nhit lng, hc mc 1 nh lut 1 nhit ng hc. 3 Vn dng nh lut 1 Cu hi nhiu la chn Kh nng vn dng cc kin thc tnh cng thay i th hc mc 1 tch, cng k thut, ni nng v enthalpy.

3. Ngn hng cu hi v p n chi tit chng 2 Cu hi v p n tt 1 Nhit dung ring th tch ca vt c tnh theo cng thc: A/ B/ C/ ; ; ;

p n (trng s im) C (1)

2

D/ ; Quan h gia cc loi nhit dung ring:

D (1)

A/

B/

C/

D/ ; 3 Nhit dung ring ng p ca kh l tng l i lng c tr s ph thuc vo: A/ Nhit ca vt; B/ p sut ca vt; C/ C 3 p n cn li u sai; D/ Th tch ring ca vt; 4 Nhit dung ring kmol ca kh l tng l i lng c tr s ph thuc vo: A/ Nhit v p sut ca vt;

C (1)

C (1)

B/ p sut v th tch ring ca vt; C/ Qu trnh v s nguyn t trong phn t; D/ S nguyn t trong phn t; 5 Nhit dung ring khi lng ca kh l tng l: A/ Thng s trng thi; B/ Hm s trng thi; C/ Hm s ca qu trnh; D/ C 3 p n cn li u sai; 6 Nhit dung ring kmol ng p ca kh l tng cha 1 nguyn t bng: A/ 9 B/ 7 C/ 5 D/ 3 7 Nhit dung ring kmol ng p ca kh l tng cha 2 nguyn t bng: A/ 3 B/ 5 C/ 7 D/ 9 8 Nhit dung ring kmol ng p ca kh l tng cha 3 nguyn t bng: A/ 3 B/ 5 C/ 7 D/ 9 9 Nhit dung ring kmol ng tch ca kh l tng t cha 1 nguyn t bng: A/ 9 B/ 3 C/ 7 D/ 5 10 Nhit dung ring kmol ng tch ca kh l tng t cha 2 nguyn t bng: A/ 3 B/ 7 C/ 5 D/ 9 11 Nhit dung ring kmol ng tch ca kh l tng t cha 3 nguyn t bng: A/ 9 B/ 5 C/ 3 D/ 7 12 Nhit dung ring kmol ng tch ca kh l tng t cha 1 nguyn t bng: A/ 12,6; B/ 20,9; C/ 29,3; cho cht kh c phn cho cht kh c phn cho cht kh c phn cho cht kh c phn cho cht kh c phn t cho cht kh c phn t cho cht kh c phn t

C (1)

C (1)

C (1)

D (1)

B (1)

C (1)

D (1)

A (1)

D/ 37,4; 13 Nhit dung ring kmol ng tch ca kh l tng t cha 2 nguyn t bng: A/ 12,6; B/ 20,9; C/ 29,3; D/ 37,4; 14 Nhit dung ring kmol ng tch ca kh l tng t cha 3 nguyn t bng: A/ 12,6; B/ 20,9; C/ 29,3; D/ 37,4; 15 Nhit dung ring kmol ng p ca kh l tng t cha 1 nguyn t bng: A/ 12,6; B/ 29,3; C/ 20,9; D/ 37,4; 16 Nhit dung ring kmol ng p ca kh l tng cha 2 nguyn t bng: A/ 12,6; B/ 20,9; C/ 29,3; D/ 37,4; 17 Nhit dung ring kmol ng p ca kh l tng cha 3 nguyn t bng: A/ 12,6; B/ 20,9; C/ 29,3; D/ 37,4; 18 Mi lin h gia vi l: cho cht kh c phn t cho cht kh c phn t cho cht kh c phn cho cht kh c phn cho cht kh c phn B (1)

C (1)

C (1)

C (1)

D (1)

C (1)

A/

B/

C/

.

D/ 19 Cng thc tnh nhit dung ring trung bnh: A/ B/

D (1)

C/

D/ 20

; D (1)

Cng thc tnh nhit lng q theo nhit dung ring thc

l:

A/

B/

C/

D/ 21

. , , l: A (1)

Cng thc tnh nhit lng q theo nhit dung ring trung bnh A/ ;

B/

C/ D/ 22 Nhit dung ring trung bnh ca kh thc c tr s ph thuc vo: C A/ Nhit ca vt. (1) B/ Qu trnh. C/ Qu trnh v nhit ca vt. D/ S nguyn t trong phn t. 23 Nhit lng v cng c: C A/ Nhit lng l hm s ca qu trnh. (1) B/ Cng l hm s ca qu trnh. C/ Nhit lng v cng u l hm s ca qu trnh. D/ Nhit lng v cng u l hm s ca trng thi. 24 Phng trnh nh lut 1 nhit ng hc: D A/ Q=U + L. (1) B/ q=du + dl. C/ dq=du + vdp. D/ dq=dh - vdp. Chng : 1. Cc ni dung kin thc ti thiu m sinh vin phi nm vng sau khi hc xong chng 3 1.1 Hiu c cac khai nim, inh nghia v: Qu trnh ng tch, ng p, ng nhit, on nhit, a bin. 1.2 Hiu va vn dung c cng thc tnh bin thin ni nng, bin thin entropy, cng thay i th tch, cng k thut, nhit lng tham gia qu trnh. 2. Cc mc tiu kim tra nh gi v dng cu hi kim tra nh gi gi chng 3 Stt Mc tiu kim tra nh gi Ni dung Dng cu hi 1 2 Qu trnh ng tch, Cu hi nhiu la chn Mc Nh c cc kin thc ng p, ng nhit, mc 1 on nhit, a bin. Mc Hiu c cc kin thc bin thin ni nng, Cu hi nhiu la chn hc mc 1 bin thin entropy, cng thay i th tch,

3

4

5

6

cng k thut, nhit lng tham gia qu trnh. Vn dng tnh ton bin thin ni nng, Kh nng vn dng cc kin thc bin thin entropy, cng hc mc 1 thay i th tch, cng k thut, nhit lng tham gia qu trnh. Hiu bi ton thuc qu trnh g. S dng mi quan h Kh nng phn tch gia cc thng s u v cui qu trnh tm thng s trng thi cn thit. Cc loi bi ton tm Kh nng tng hp: cng v nhit lng. So snh cc qu trnh ng tch, ng p, Kh nng so snh, nh gi: ng nhit, on nhit, a bin.

Cu hi nhiu la chn

Cu hi nhiu la chn

Cu hi nhiu la chn Cu hi nhiu la chn

3. Ngn hng cu hi v p n chi tit chng 3 Cu hi v p n tt 1 Qu trnh ng tch ca kh l tng l qu trnh c: A/ B/ C/ 2 D/ . bin thin entropy trong qu trnh ng tch 1-2 ca kh l tng bng: A/ B/ C/ D/ 3 Trong qu trnh ng tch 1-2 ca kh l tng c s1 < s2 th: A/ p2 > p1; B/ p2 < p1; C/ p2 = p1; D/ T1 > T2. 4 Trong qu trnh ng tch 1-2 ca kh l tng c s1 < s2 th: A/ T2 > T1; B/ T2 < T1; C/ T2=T1; D/ C 3 p n khc u sai. 5 Nhit lng tham gia trong qu trnh ng tch ca kh l tng: A/ B/ C/ D/ . .

p n (trng s im) D (1)

B (1)

A (1)

A (1)

B (1)

6 Cng k thut tham gia qu trnh ng tch 1-2 ca kh l tng: A/ B/ C/ . . .

D (1)

D/ . 7 Nhit lng tham gia trong qu trnh ng tch ca kh l tng: A/ Bng bin thin ni nng. B/ Bng bin thin enthalpy. C/ Bng bin thin entropy. D/ Bng cng k thut. 8 i lng no di y l i lng ch ng trong qu trnh ng p 1-2 ca kh l tng: A/ B/ C/ .

A (1)

C (1)

D/ 9 Trong qu trnh ng p 1-2 ca kh l tng c s2 > s1 th: A/ v2 > v1; B/ v2 < v1; C/ v2=v1; D/ T2 < T1; 10 Trong qu trnh ng p 1-2 ca kh l tng c s1 < s2 th: A/ T2 > T1; B/ T2 < T1; C/ T2=T1; D/ v2 < v1; 11 bin thin entropy trong qu trnh ng p 1-2 ca kh l tng bng: A/ B/ C/ D/ 12 Nhit lng tham gia trong qu trnh ng p ca kh l tng: A/ B/ C/ D/ . 13 Cng k thut tham gia qu trnh ng p 1-2 ca kh l tng: A/ B/ C/ D/ . . .

A (1)

A (1)

A (1)

B (1)

D (1)

14 Nhit lng tham gia trong qu trnh ng p ca kh l tng: A/ Bng bin thin ni nng. B/ Bng bin thin enthalpy. C/ Bng bin thin entropy. D/ Bng cng k thut. 15 Qu trnh ng nhit 1-2 ca kh l tng l qu trnh c: A/ B/ C/ D/ q = 0. 16 bin thin entropy trong qu trnh ng nhit 1-2 ca kh l tng bng: A/ B/ C/ D/ . 17 Nhit lng tham gia trong qu trnh ng nhit 1-2 ca kh l tng: A/ B/ ; ; ;

B (1)

A (1)

D (1)

A (1)

C/ ; D/ q = 0. 18 Cng k thut tham gia qu trnh ng nhit 1-2 ca kh l tng: A/ B/ C/ ; ; ;

B (1)

D/ ; 19 Nhit lng tham gia trong qu trnh ng nhit ca kh l tng: A/ Bng bin thin ni nng. B/ Bng bin thin enthalpy. C/ Bng bin thin entropy. D/ Bng cng k thut. 20 Trong qu trnh ng nhit 1-2 ca kh l tng c s1 < s2 th: A/ v2 > v1 v p2 > p1; B/ v2 > v1 v p2 < p1; C/ v2 < v1 v p2 > p1; D/ v2 < v1 v p2 < p1. 21 Qu trnh on nhit 1-2 ca kh l tng l qu trnh c: A/

D (1)

B (1)

D (1)

B/ C/ C 3 p n cn li u sai. D/ ds = 0; 22 bin thin entropy trong qu trnh on nhit 1-2 ca kh l tng bng: A/ B/ C/ D/ . 23 Cng dn n trong qu trnh on nhit 1-2 ca kh l tng: A/ B/ ;

D (1)

B (1)

C/ D/ l = R*(T1 - T2); 24 Cng k thut trong qu trnh on nhit 1-2 ca kh l tng: A/ B/ C/ l = R*(T1 - T2); D/ ; 25 Nhit lng tham gia trong qu trnh on nhit ca kh l tng c tr s bng: A/ Bng bin thin enthalpy. B/ q = 0. C/ Bng cng k thut. D/ Bng cng dn n. 26 Trong qu trnh on nhit 1-2 ca kh l tng c T1 > T2 th: A/ v2 > v1 v p2 > p1; B/ v2 > v1 v p2 < p1; C/ v2 < v1 v p2 > p1; D/ v2 < v1 v p2 < p1. 27 Qu trnh a bin 1-2 ca kh l tng l qu trnh c: A/ B/ C/ D/ ; 28 bin thin entropy trong qu trnh a bin 1-2 ca kh l tng bng: A/ ; ;

D (1)

B (1)

B (1)

B (1)

C (1)

B/ C/ .

D/ 29 Cng dn n trong qu trnh a bin 1-2 ca kh l tng: A/ B/ C/ D/ ; ;

B (1)

30 Cng k thut trong qu trnh a bin 1-2 ca kh l tng: A/ B/ C/ D/ ; Nhit lng tham gia trong qu trnh a bin 1-2 ca kh l tng: A/ Bng bin thin enthalpy. B/ Bng bin thin entropy. C/ Bng cng k thut. D/ C 3 p n cn li u sai. Trong qu trnh a bin 1-2 ca kh l tng c T1 > T2 v n =1 k th: A/ v2 > v1 v p2 > p1; B/ v2 > v1 v p2 < p1; C/ v2 < v1 v p2 > p1; D/ v2 < v1 v p2 < p1; Qu trnh a bin c n = 1 l qu trnh: A/ ng tch; B/ ng p; C/ ng nhit; D/ on nhit. Qu trnh a bin c n = 1 l qu trnh: A/ ng tch; B/ ng p; C/ ng ni nng; D/ Cc p n cn li u sai. Qu trnh a bin c n = 1 l qu trnh: A/ Cc p n khc u sai; B/ ng p; C/ ng enthalpy; D/ on nhit; Qu trnh a bin c n = 0 l qu trnh: A/ ng tch; B/ ng p; C/ ng nhit; D/ on nhit. Qu trnh a bin c n = k l qu trnh: ;

B (1)

31

D (1)

32

B (1)

33

C (1)

34

C (1)

35

C (1)

36

B (1)

37

D

A/ ng tch; B/ ng p; C/ ng nhit; D/ on nhit. 38 Qu trnh a bin c n = k l qu trnh: A/ ng tch; B/ ng p; C/ ng nhit; D/ ng entropy; 39 Qu trnh a bin c n = l qu trnh: A/ ng tch; B/ ng p; C/ ng nhit; D/ on nhit. 40 Khi c cng thng s trng thi 1 (T1, p1) v p2 (p2 > p1) th cng k thut (tnh gi tr tuyt i) cp cho 3 qu trnh: ng nhit; on nhit k=1,3; a bin n=1,2 c: A/ Cng k thut cp cho qu trnh ng nhit ln nht; B/ Cng k thut cp cho qu trnh on nhit ln nht; C/ Cng k thut cp cho qu trnh a bin ln nht; D/ C ba p n khc u sai. 41 Khi c cng thng s trng thi 1 (T1, p1) v p2 (p2 > p1) th nhit lng nh ra (tnh gi tr tuyt i) cp cho 3 qu trnh: ng nhit; on nhit k=1,3; a bin n=1,2 c: A/ Nhit lng nh ra trong qu trnh ng nhit ln nht; B/ Nhit lng nh ra trong qu trnh on nhit ln nht; C/ Nhit lng nh ra trong qu trnh a bin ln nht; D/ C ba p n khc u sai 42 Khi c cng thng s trng thi 1 (T1, p1) v p2 (p2 > p1), nu mi qu trnh l thun nghch th cng nn on nhit cho cng 1 kg mi cht ca my nn mt cp c khng gian cht lc so vi cng nn ca my nn khng c khng gian cht l l: A/ lc > l; B/ lc > l; C/ lc=l; D/ Khi ln hn, khi nh hn ty thuc s m on nhit v cc tn tht nhit. 43 1kg khng kh c p1=1bar, t1=25oC, sau khi nn on nhit p sut tng ln 6 ln. Th tch ring v2 (m3/kg) bng: A/ 0.2377 B/ 0,3205 C/ 0,4185 D/ 0,1755 44 1kg khng kh c p1=1bar, t1=25oC, sau khi nn on nhit p sut tng ln 12 ln. Th tch ring v2 (m3/kg) bng: A/ 0,145 B/ 0,130 C/ 0,318 D/ 0,37 45 1kg khng kh c p1=1bar, t1=27oC, sau khi nn on nhit p sut tng ln 8 ln. Th tch ring v2 (m3/kg) bng: A/ 0,195 B/ 0,205 C/ 0,185 D/ 0,175 46 1kg khng kh c p1=1bar, t1=45OC, sau khi nn on nhit p sut tng ln 5 ln. Th tch ring v2 (m3/kg) bng: A/ 0,222 B/ 0,289 C/ 0,178 D/ 0,168 47 1kg khng kh c p1=1bar, T1=308K, sau khi nn on nhit p sut tng ln 8 ln. Cng k thut lkt (kJ/kg) bng: A/ -251 B/ -280 C/ -225 D/ -176 48 1kg khng kh c p1=1bar, T1=300K, sau khi nn on nhit p sut tng ln 6 ln. Cng k thut lkt (kJ/kg) bng:

(1)

D (1)

A (1)

B (1)

A (1)

C (1)

A (2)

A (2)

A (2)

B (2)

A (2)

B (2)

49

50

51

52

53

54

55

56

57

58

59

A/ -312 B/ -201 C/ -245 D/ -176 1kg khng kh c p sut p1=1bar, nhit T1=273K, sau khi nn on nhit p sut tng ln 8 ln. Cng k thut lkt (kJ/kg) bng: A/ -212 B/ -232 C/ -222 D/ -176 1kg khng kh c p1=1bar, T1=288K, sau khi nn on nhit p sut tng ln 5 ln. Cng k thut lkt (kJ/kg) bng: A/ -147 B/ -127 C/ -187 D/ -167 Cho qu trnh a bin c V1=5m3, p1=2bar, V2=2m3, p2=6bar. S m a bin n bng: A/ 1,25 B/ 1,15 C/ 1,2 D/ 1,10 Cho qu trnh a bin c V1=15m3, p1=1bar, V2=4m3, p2=6bar. S m a bin n bng: A/ 1,36 B/ 1,26 C/ 1,16 D/ 1,06 Cho qu trnh a bin c V1=10m3, p1=1bar, V2=5m3, p2=2,4bar. S m a bin n bng: A/ 1,30 B/ 1,26 C/ 1,15 D/ 1,16 Cho qu trnh a bin c V1=13m3, p1=1bar, V2=2,4m3, p2=6bar. S m a bin n bng: A/ 1,25 B/ 1,21 C/ 1,15 D/ 1,05 Khng kh thc hin qu trnh a bin c V1=10m3, p1=1bar, p2=10bar, n=1,05. Nhit lng Q tham gia qu trnh (kJ) bng: A/ -2619 B/ -1781 C/ -2028 D/ -2302 Khng kh thc hin qu trnh a bin c V1=10m3, p1=1bar, p2=8bar, n=1,10. Nhit lng Q tham gia qu trnh (kJ) bng: A/ -1560 B/ -1760 C/ -1960 D/ -1360 Khng kh thc hin qu trnh a bin c V1=10m3, p1=1bar, p2=8bar, n=1,30. Nhit lng Q tham gia qu trnh (kJ) bng: A/ -513 B/ -723 C/ -323 D/ -1360 Khng kh thc hin qu trnh a bin c V1=10m3, p1=1bar, p2=8bar, n=1,25. Nhit lng Q tham gia qu trnh (kJ) bng: A/ -773 B/ -973 C/ -573 D/ -1360 Cho qu trnh nn khng kh a bin c V1=15m3, p1=2bar, p2=12bar, n=1,25.

C (2)

D (2)

A (2)

B (2)

D (2)

C (2)

A (2)

A (2)

A (2)

A

Cng k thut Lkt (kJ) bng: (2) A/ -6464 B/ -6264 C/ -6055 D/ -5837 60 Cho qu trnh nn khng kh a bin c V1=15m3, p1=2bar, p2=12bar, n=1,20. B Cng k thut Lkt (kJ) bng: (2) A/ -6464 B/ -6264 C/ -6055 D/ -5837 61 Cho qu trnh nn khng kh a bin c V1=15m3, p1=2bar, p2=12bar, n=1,15. C Cng k thut Lkt (kJ) bng: (2) A/ -6464 B/ -6264 C/ -6055 D/ -5837 62 Cho qu trnh nn khng kh a bin c V1=15m3, p1=2bar, p2=12bar, n=1,10. D Cng k thut Lkt (kJ) bng: (2) A/ -6464 B/ -6264 C/ -6055 D/ -5837 Chng : 1. Cc ni dung kin thc ti thiu m sinh vin phi nm vng sau khi hc xong chng 4 1.1 Hiu c cac khai nim, inh nghia v: My nn pittng 1 cp, nhiu cp, khng gian cht. 1.2 Hiu cc nguyn l lm vic ca chu trnh my nn pittng 1 cp khng c khng gian cht, c khng gian cht, nhiu cp nn. Cng thc tnh cng cho cc chu trnh. 2. Cc mc tiu kim tra nh gi v dng cu hi kim tra nh gi gi chng 4 Stt Mc tiu kim tra nh gi Ni dung Dng cu hi My nn pittng 1 cp, Cu hi nhiu la chn Mc Nh c cc kin thc nhiu cp, c khng 1 mc 1 gian cht v khng c khng gian cht. Nguyn l lm vic ca Cu hi nhiu la chn cc chu trnh my nn 1 Mc Hiu c cc kin thc 2 cp khng c khng hc mc 1 gian cht, c khng gian cht v nhiu cp nn. Kh nng vn dng cc kin thc Vn dng tnh ton cng Cu hi nhiu la chn 3 hc mc 1 ca chu trnh. 3. Ngn hng cu hi v p n chi tit chng 4 tt Cu hi v p n 1 mi cpMy nn kh l tng m cp c cng nn nh nht th bng:


A/

B/

C/

D/ 2

; D (1)

My nn kh l tng m cp s c cng nn nh nht khi: A/ T s nn mi cp bng nhau; B/ Nhit cui mi tm nn bng nhau; C/ Nhit u mi tm nn bng nhau;

3

D/ Nhit u mi tm nn bng nhau; t s nn mi cp bng nhau; My nn kh l tng m cp s c cng nn nh nht (tnh gi tr tuyt i) bng:

D (1)

A/

B/

C/

D/ ; 4 My nn khng kh c R=287 J/(kg.); p1=1 bar; T1=300 K; p2=10 bar nn theo 3 qu trnh: on nhit k=1,4 vi cng ls; ng nhit vi cng lT; a bin n=1,2 vi cng ln; ta c cc cng nn bng (J/kg): A/ lT=280465; ls=241665; ln=198252 B/ lT=241665; ls=198252; ln=280465 C/ lT=198252; ls=241665; ln=280465 D/ lT=198252; ls=280465; ln=241665 5 My nn 3 cp c pu=1 at; pcui=100 at th p sut cui tm nn cp hai bng: A/ 21,54 at B/ 25,54 at C/ 31,54 at D/ 35,54 at 6 Cn chn t nht bao nhiu cp nn nu pu=1 bar; pcui=250 bar; mi cp khng vt qu 8. A/ 2 cp B/ 3 cp C/ 4 cp D/ 5 cp 7 Nu qu trnh nn xy ra nhanh, xy lanh cch nhit tt th cng nn c tnh theo cng thc:

D (1)

A (1)

B (1)

A (1)

A/ B/

. .

C/ vi k n 1. D/ C 3 p n cn li u sai. 8 Nu qu trnh nn xy ra v cng chm, xy lanh gii nhit tt th cng nn c tnh theo cng thc:

B (1)

A/ B/

. .

C/ vi k n 1. D/ C 3 p n cn li u sai. 9 Nu qu trnh nn bnh thng, xy lanh c gii nhit (bng khng kh hoc nC/ th cng nn c tnh theo cng thc:

C (1)

A/ B/

. .

C/ vi k n 1. D/ C 3 p n cn li u sai. Chng : 1. Cc ni dung kin thc ti thiu m sinh vin phi nm vng sau khi hc xong chng 5 1.1 Hiu c cac khai nim, inh nghia v: Trng thi cn bng, khng cn bng, qu trnh thun nghch v khng thun nghch. Chu trnh Carnot thun v Chu trnh Carnot ngc. 1.2 Hiu va vn dung c cng thc tnh nhit lng ngun nng, ngun lnh, cng chu trnh, hiu sut nhit ca chu trnh Carnot thun v h s lm lnh ca chu trnh Carnot ngc. 2. Cc mc tiu kim tra nh gi v dng cu hi kim tra nh gi gi chng 5 Stt Mc tiu kim tra nh gi Ni dung Dng cu hi Trng thi cn bng, Cu hi nhiu la chn khng cn bng, qu trnh thun nghch v Mc Nh c cc kin thc 1 khng thun nghch. mc 1 Chu trnh Carnot thun v Chu trnh Carnot ngc. Cng thc tnh nhit Cu hi nhiu la chn lng ngun nng, ngun lnh, cng chu Mc Hiu c cc kin thc trnh, hiu sut nhit 2 hc mc 1 ca chu trnh Carnot thun v h s lm lnh ca chu trnh Carnot ngc. Vn dng tnh nhit Cu hi nhiu la chn lng ngun nng, ngun lnh, cng chu Kh nng vn dng cc kin thc trnh, hiu sut nhit 3 hc mc 1 ca chu trnh Carnot thun v h s lm lnh ca chu trnh Carnot ngc. So sanh hiu sut nhit Cu hi nhiu la chn cua chu trinh Carnot thun va h s lam lanh 4 Kh nng so snh, nh gi: cua chu trinh Carnot ngc vi cac chu trinh khac 3. Ngn hng cu hi v p n chi tit chng 5 Cu hi v p n tt 1 Qu trnh thun nghch l qu trnh c tn tht nhit: A/ Ln nht; B/ Nh nht song khc khng;


2

C/ Bng khng; D/ Gi tr tn tht ty thuc qu trnh. Hiu sut nhit c dng nh gi hiu qu s dng nhit ca: A/ Chu trnh tiu th cng; B/ Chu trnh ngc; C/ Chu trnh sinh cng; D/ C 2 chu trnh sinh cng v tiu th cng. Hiu sut nhit c tnh theo cng thc:

C (1)

3

C (1)

A/

B/

C/

;

4

5

6

7

8

9

D/ Cng cp cho chu trnh c th biu th bng din tch trn th: A/ p-v; B/ T-s; C/ C p-v v T-s; D/ Khng biu th c trn th p-v ln T-s. Cng do chu trnh sinh ra c th biu th bng din tch trn th T-s c khng? A/ Khng biu th c; B/ Cng cp cho chu trnh mi biu th c; C/ Ty theo mi cht m c th c hoc khng c; D/ Biu th c. Nhit lng cp cho qu trnh c th biu th bng din tch trn th: A/ p-v; B/ T-s; C/ C p-v v T-s; D/ C 3 p n cn li u sai. Cng cp cho qu trnh c th biu th bng din tch trn th: A/ p-v; B/ T-s; C/ C p-v v T-s; D/ C 3 p n cn li u sai u sai. Hai chu trnh ngc chiu c cng nhit ngun nng v ngun lnh, c h s lm lnh ln lt l =3 v =4 th: A/ chu trnh c =3 tt hn; B/ chu trnh c =4 tt hn; C/ ty mi cht lnh s dng; D/ c 2 chu trnh u tt nh nhau. H s lm lnh ca chu trnh Carnot ngc chiu: A/

C (1)

D (1)

B (1)

A (1)

B (1)

C (1)

B/ C/ ;

D/ 10 Chu trnh Carnot l chu trnh thc hin bi: A/ 2 qu trnh ng nhit v 2 qu trnh ng p; B/ 2 qu trnh ng tch v 2 qu trnh ng p;

D (1)

11

12

13

14

15

16

17

18

19

20

21

C/ 2 qu trnh on nhit v 2 qu trnh ng tch; D/ 2 qu trnh ng nhit v 2 qu trnh ng entropy. Chu trnh Carnot thun chiu l chu trnh: A/ C hiu sut nhit ln nht khi c cng nhit ngun nng v ngun lnh; B/ C chiu din bin theo chiu kim ng h; C/ C hiu sut nhit khng ph thuc cht mi gii; D/ C 3 p n cn li u ng. Chu trnh no c th ch s dng 1 ngun nhit duy nht: A/ Khng c chu trnh no c. B/ Chu trnh thun chiu. C/ Chu trnh ngc chiu. D/ C chu trnh thun chiu v ngc chiu. Chu trnh Carnot thun chiu c nhit ngun nng t1 = 750oC, ngun lnh t2 = 40oC. Hiu sut nhit ca chu trnh bng: A/ 0,76 B/ 0,66 C/ 0,69 D/ 0,603 Chu trnh Carnot thun chiu c nhit ngun nng t1 = 550oC, ngun lnh t2 = 60oC. Hiu sut nhit ca chu trnh bng: A/ 0,76 B/ 0,66 C/ 0,595 D/ 0,603 Chu trnh Carnot thun chiu c nhit ngun nng t1 = 550oC, ngun lnh t2 = 40oC. Hiu sut nhit ca chu trnh bng: A/ 0,62 B/ 0,66 C/ 0,575 D/ 0,7 Chu trnh Carnot thun chiu c nhit ngun nng t1 = 850oC, ngun lnh t2 = 50oC. Hiu sut nhit ca chu trnh bng: A/ 0,71 B/ 0,66 C/ 0,60 D/ 0,762 Chu trnh Carnot ngc chiu c nhit ngun nng t1 = 55oC, ngun lnh t2 = 10oC. H s lm lnh ca chu trnh bng: A/ 6,29 B/ 6,89 C/ 5,19 D/ 4,93 Chu trnh Carnot ngc chiu c nhit ngun nng t1 = 35oC, ngun lnh t2 = -10oC. H s lm lnh ca chu trnh bng: A/ 5,8 B/ 6,9 C/ 4,1 D/ 4,95 Chu trnh Carnot ngc chiu c nhit ngun nng t1 = 50oC, ngun lnh t2 = 10oC. H s lm lnh ca chu trnh bng: A/ 7,08 B/ 6,89 C/ 5,19 D/ 5,93 Chu trnh Carnot ngc chiu c nhit ngun nng t1 = 35oC, ngun lnh t2 = -20oC. H s lm lnh ca chu trnh bng: A/ 4,6 B/ 3,8 C/ 4,1 D/ 4,9 Khng kh c thng s trng thi T=650K, s=450J/(kg/). Cho bit gc tnh entropy (s=0) ti 0oC, 1bar. Ap sut (bar) bng: A/ 4,275 B/ 4,545 C/ 3,836

D (1)

A (1)

C (2)

C (2)

A (2)

A (2)

C (2)

A (2)

A (2)

A (2)

A (2)

D/ 12,465 22 Khng kh c thng s trng thi T=500K, s=200J/(kg/). Cho bit gc tnh entropy A (s=0) ti 0oC, 1bar. Ap sut (bar) bng: (2) A/ 4,095 B/ 4,351 C/ 4,654 D/ 2,568 23 Khng kh c thng s trng thi T=425K, s=75J/(kg/). Cho bit gc tnh entropy A (s=0) ti 0oC, 1bar. Ap sut (bar) bng: (2) A/ 3,593 B/ 2,593 C/ 4,369 D/ 2,568 24 Khng kh c thng s trng thi T=1250K, s=700J/(kg/). Cho bit gc tnh entropy A (s=0) ti 0oC, 1bar. Ap sut (bar) bng: (2) A/ 17,465 B/ 20,465 C/ 15,465 D/ 12,465 25 Khng kh c thng s trng thi T=750K, s=20J/(kg/). Cho bit gc tnh entropy A (s=0) ti 0oC, 1bar. Th tch ring (m3/kg) bng: (2) A/ 0,125 B/ 0,155 C/ 0,085 D/ 0,201 26 Khng kh c thng s trng thi T=250K, s=20J/(kg/). Cho bit gc tnh entropy A (s=0) ti 0oC, 1bar. Th tch ring (m3/kg) bng: (2) A/ 1,050 B/ 1,582 C/ 2,652 D/ 0,682 27 Khng kh c thng s trng thi T=550K, s=400J/(kg/). Cho bit gc tnh entropy A (s=0) ti 0oC, 1bar. Th tch ring (m3/kg) bng: (2) A/ 0,546 B/ 0,582 C/ 0,652 D/ 0,682 28 Khng kh c thng s trng thi T=1250K, s=700J/(kg/). Cho bit gc tnh entropy A (s=0) ti 0oC, 1bar. Th tch ring (m3/kg) bng: (2) A/ 0,198 B/ 0,258 C/ 0,652 D/ 0,168 Chng : 1. Cc ni dung kin thc ti thiu m sinh vin phi nm vng sau khi hc xong chng 6 Hiu c nguyn ly lam vic cac cng thc tinh toan: chu trinh ng c t trong cp nhit ng tich, ng ap, hn hp va chu trinh turbin khi cp nhit ng ap. 2. Cc mc tiu kim tra nh gi v dng cu hi kim tra nh gi gi chng 6 Stt Mc tiu kim tra nh gi Ni dung Dng cu hi Hiu c nguyn ly Cu hi nhiu la chn lam vic cua cac chu trinh ng c t trong Mc Nh c cc kin thc 1 cp nhit ng tich, mc 1 ng ap hn hp va chu trinh turbin khi cp nhit ng ap. Hiu c cac cng Cu hi nhiu la chn thc tinh toan nhit Mc Hiu c cc kin thc cac im nut, nhit 2 hc mc 1 lng tham gia va hiu sut nhit cua cac chu trinh 3 Kh nng vn dng cc kin thc Vn dng tnh ton nhit Cu hi nhiu la chn hc mc 1 cac im nut, nhit lng tham gia va hiu

4

Kh nng so snh, nh gi:

sut nhit cua cac chu trinh So snh cng cua 3 chu Cu hi nhiu la chn trinh cp nhit ng tich, ng ap va hn hp.

3. Ngn hng cu hi v p n chi tit chng 6 Cu hi v p n tt 1 Nhit T2 cui qu trnh nn 1-2 on nhit ca ng c t trong piston cp nhit ng tch c tnh theo cng thc: A/ B/ C/ 2 D/ ; Nhit T3 cui qu trnh cp nhit ca ng c t trong piston cp nhit ng tch c tnh theo cng thc: A/ B/ C/ D/ 3 ; ; ; ;


D (1)

Nhit T3 cui qu trnh cp nhit ca ng c t trong piston cp nhit ng tch c tnh theo cng thc: A/ B/ C/ ; ; ;

A (1)

D/ ; 4 Nhit T4 cui qu trnh dn n ca ng c t trong piston cp nhit ng tch c tnh theo cng thc: A/ B/ C/ ; ; ;

A (1)

D/ ; 5 Nhit lng cp cho chu trnh ng c t trong piston cp nhit ng tch bng: A/ B/ C/ ; ; ;

D (1)

D/ ; 6 Nhit lng cp cho chu trnh ng c t trong piston cp nhit ng tch bng: A/ B/ C/ . . .

C (1)

D/ . 7 Nhit lng nh ra mi trng xung quanh ca chu trnh ng c t trong piston cp nhit ng tch bng: A/ ;

D (1)

B/ C/ D/ ;

;

; D (1)

8 4 chu trnh ng c t trong piston cp nhit ng tch c 1=6; 2=7; 3=8; 4=9; hiu sut nhit tng ng l t1; t2; t3; t4 th: A/ t1 ln nht B/ t2 ln nht C/ t3 ln nht D/ t4 ln nht 9 Chu trnh ng c t trong piston cp nhit ng tch c cng vi cc kh l tng c phn t cha 1 nguyn t, 2 nguyn t, 3 nguyn t; hiu sut nhit tng ng l t1; t2; t3 th: A/ t1 ln nht B/ t2 ln nht C/ 3 ln nht D/ do cha bit nn khng xc nh c hiu sut nhit 10 Nhit T3 cui qu trnh cp nhit ca ng c t trong piston cp nhit ng p c tnh theo cng thc: A/ B/ C/ ; ; ;

A (1)

C (1)

D/ ; 11 Nhit T3 cui qu trnh cp nhit ca ng c t trong piston cp nhit ng p c tnh theo cng thc: A/ B/ C/ ; ; ;

B (1)

D/ . 12 Nhit T3 cui qu trnh cp nhit ca ng c t trong piston cp nhit ng p c tnh theo cng thc: A/ B/ C/ ; ; ;

B (1)

D/ . 13 Nhit lng cp cho chu trnh ng c t trong piston cp nhit ng p bng: A/ B/ C/ ; ; ;

C (1)

D/ ; 14 Nhit lng nh ra mi trng xung quanh ca chu trnh ng c t trong piston cp nhit ng p bng: A/ B/ C/ ; ; ;

D (1)

D/ ; 15 Hiu sut nhit ca chu trnh ng c t trong piston cp nhit ng p bng:

D (1)

A/

;

B/ C/ ;

;

D/ ; 16 Nhit T5 cui qu trnh cp nhit ng tch ca ng c t trong piston cp nhit hn hp c tnh theo cng thc: A/ B/ C/ ; ; ;

D (1)

D/ ; 17 Nhit T3 cui qu trnh cp nhit ng p ca ng c t trong piston cp nhit hn hp c tnh theo cng thc: A/ B/ C/ ; ; ;

D (1)

D/ ; 18 Nhit T4 cui qu trnh dn n ca ng c t trong piston cp nhit hn hp c tnh theo cng thc: A/ B/ C/ ; ; ;

D (1)

D/ ; 19 Nhit lng cp cho chu trnh ng c t trong piston cp nhit hn hp bng: A/ B/ C/ ; ; ;

B (1)

D/ ; 20 Nhit lng nh ra mi trng xung quanh ca chu trnh ng c t trong piston cp nhit hn hp bng: A/ B/ C/ ; ; ;

D (1)

D/ ; 21 Hiu sut nhit ca chu trnh ng c t trong piston cp nhit hn hp bng: A/ ;

B (1)

B/ C/

; ;

D/ ; 22 4 chu trnh ng c t trong piston cp nhit hn hp c cng v ; l 1 < 2 < 3 < 4; hiu sut nhit tng ng l t1; t2; t3; t4 th: A/ t1 ln nht B/ t2 ln nht C/ t3 ln nht D/ t4 ln nht 23 Khi c cng qu trnh nh nhit 4-1 v qu trnh nn 1-2 th hiu sut nhit ca chu trnh ng c t trong piston cp nhit ng tch l t,v; chu trnh ng c t trong piston cp nhit ng p l t,p; chu trnh ng c t trong piston cp nhit hn hp l t,vp th: A/ t,vp ln nht B/ t,p ln nht C/ t,v ln nht D/ t,vp nh nht 24 Khi c cng qu trnh nh nhit 4-1 v qu trnh nn 1-2 th hiu sut nhit ca chu trnh ng c t trong piston cp nhit ng tch l t,v; chu trnh ng c t trong piston cp nhit ng p l t,p; chu trnh ng c t trong piston cp nhit hn hp l t,vp th: A/ t,p ln nht B/ t,v ln nht C/ t,p > t,,vp > t,v D/ t,v > t,,vp > t,p 25 Khi c cng qu trnh nh nhit 4-1 v qu trnh dn n sinh cng 3-4 th hiu sut nhit ca chu trnh ng c t trong piston cp nhit ng tch l t,v; chu trnh ng c t trong piston cp nhit ng p l t,p; chu trnh ng c t trong piston cp nhit hn hp l t,vp th: A/ t,p ln nht B/ t,v ln nht C/ t,p > t,,vp > t,v D/ t,v > t,,vp > t,p 26 Chu trnh ng c t trong piston cp nhit ng tch, c khng gian cht Vc=0,15dm3, th tch qut ca piston Vq=0,85dm3. Hiu sut nhit ca chu trnh bng: A/ 0,532 B/ 0,582 C/ 0,652 D/ 0,682 27 Chu trnh ng c t trong piston cp nhit ng tch, c khng gian cht Vc=20cm3, th tch qut ca piston Vq=110cm3. Hiu sut ca chu trnh bng: A/ 0,527 B/ 0,587 C/ 0,625 D/ 0,627 28 Chu trnh ng c t trong piston cp nhit ng tch, c khng gian cht Vc=25cm3, th tch qut ca piston Vq=200cm3. Hiu sut ca chu trnh bng: A/ 0,564 B/ 0,574 C/ 0,584

A (1)

C (1)

D (1)

C (1)

A (2)

A (2)

C (2)

D/ 0,594 29 Chu trnh ng c t trong piston cp nhit ng p c t s nn n sm = 1,4. Hiu sut ca chu trnh bng: A/ 0,628 B/ 0,648 C/ 0,668 D/ 0,688 30 Chu trnh ng c t trong piston cp nhit ng p c t s nn n sm = 1,7. Hiu sut ca chu trnh bng: A/ 0,713 B/ 0,693 C/ 0,653 D/ 0,673 31 Chu trnh ng c t trong piston cp nhit ng p c t s nn n sm = 1,4. Hiu sut ca chu trnh bng: A/ 0,738 B/ 0,718 C/ 0,678 D/ 0,698 32 Chu trnh ng c t trong piston cp nhit ng p c t s nn = 24, t s dn = 22, t s dn D (2)

= 22, t s dn

D (2)

D (2)

= 23, t s dn

n sm = 1,5. Hiu sut ca chu trnh bng: A/ 0,738 B/ 0,718 C/ 0,668 D/ 0,689 Chng : 1. Cc ni dung kin thc ti thiu m sinh vin phi nm vng sau khi hc xong chng 7 Hiu c nguyn ly lam vic va cac cng thc tinh toan cua chu trinh may lanh 1 cp dung mi cht la khng khi va chu trinh may lanh 1 cp dung mi cht la hi. Hiu c s hoa hi cua cht long. 2. Cc mc tiu kim tra nh gi v dng cu hi kim tra nh gi gi chng 7 Stt Mc tiu kim tra nh gi Ni dung Dng cu hi Hiu c nguyn ly Cu hi nhiu la chn Mc Nh c cc kin thc lam vic cua 2 chu trinh 1 mc 1 may lanh dung mi cht la khng khi va hi. Hiu c s hoa hi Cu hi nhiu la chn Mc Hiu c cc kin thc cua cht long, cac cng 2 hc mc 1 thc tinh toan cua 2 chu trinh trn. Vn dng tnh ton h Cu hi nhiu la chn Kh nng vn dng cc kin thc s lam lanh cua 2 chu 3 hc mc 1 trinh may lanh dung mi cht la khng khi va hi. So snh h s lam lanh Cu hi nhiu la chn 4 Kh nng so snh, nh gi: cua 2 chu trinh vi chu trinh Carnot ngc. 3. Ngn hng cu hi v p n chi tit chng 7 Cu hi v p n tt 1 Cho chu trnh my lnh mt cp dng mi cht l khng kh. Cho t1=-30oC; t2=182oC; t3=45oC; t4=-103oC; p1=1bar; p2=9bar. Nhit lng q1 (kJ/kg) nh ra cho ngun nng bng: A/ 73 B/ 212 C/ 137 D/ 148 2 Cho chu trnh my lnh mt cp dng mi cht l khng kh. Cho t1=-30oC; t2=182oC; t3=45oC; t4=-103oC; p1=1bar; p2=9bar. Nhit lng q2 (kJ/kg) nhn c t ngun lnh bng: A/ 148

D (2)


C (1)

3

4

5

6

7

8

9

10

B/ 137 C/ 73 D/ 212 Cho chu trnh my lnh mt cp dng mi cht l khng kh. Cho t1=-30oC; t2=182oC; t3=45oC; t4=-103oC; p1=1bar; p2=9bar. Cng cp cho my nn lmn (kJ/kg) bng: A/ 137 B/ 73 C/ 148 D/ 212 Cho chu trnh my lnh mt cp dng mi cht l khng kh. Cho t1=-30oC; t2=182oC; t3=45oC; t4=-103oC; p1=1bar; p2=9bar. Cng do my dn n sinh ra lmdn (kJ/kg) bng: A/ 212 B/ 137 C/ 148 D/ 73 Cho chu trnh my lnh mt cp dng mi cht l khng kh. Cho t1=-30oC; t2=182oC; t3=45oC; t4=-103oC; p1=1bar; p2=9bar. H s lm lnh bng: A/ 1,74 B/ 1,54 C/ 1,34 D/ 1,14 Nhc im chnh ca h thng lnh dng mi cht l khng kh l: A/ Nhit dung ring nh B/ Th tch ring ln C/ H s ta nhit i lu nh D/ H s lm lnh nh khi c cng nhit ngun nng v ngun lnh Chu trnh my lnh 1 cp nn hi dng gas lnh R134a c: pc=13,2bar; pe=4,2bar; tc=50oC; te=-10oC. Enthalpy h1=404,5kJ/kg; h2=428,5kJ/kg; h3=271,9kJ/kg; h4=271,9kJ/kg. Cng cp cho chu trnh l bng (kJ/kg): A/ 35 B/ 132,6 C/ 24 D/ 156,6 Chu trnh my lnh 1 cp nn hi dng gas lnh R134a c: pc=13,2bar; pe=4,2bar; tc=50oC; te=-10oC. Enthalpy h1=404,5kJ/kg; h2=428,5kJ/kg; h3=271,9kJ/kg; h4=271,9kJ/kg. Nhit lng nhn c thit b bay hi bng (kJ/kg): A/ 156,6 B/ 132,6 C/ 24 D/ 96 Chu trnh my lnh 1 cp nn hi dng gas lnh R134a c: pc=13,2bar; pe=4,2bar; tc=50oC; te=-10oC. Enthalpy h1=404,5kJ/kg; h2=428,5kJ/kg; h3=271,9kJ/kg; h4=271,9kJ/kg. Nhit lng nh ra thit b ngng t bng (kJ/kg): A/ 24 B/ 132,6 C/ 156,6 D/ 195 Chu trnh my lnh 1 cp nn hi dng gas lnh R134a c: pc=13,2bar; pe=4,2bar; tc=50oC; te=-10oC. Enthalpy h1=404,5kJ/kg; h2=428,5kJ/kg; h3=271,9kJ/kg; h4=271,9kJ/kg. H s lm lnh bng: A/ 3,52 B/ 5,52 C/ 4,52 D/ 6,52

D (1)

C (1)

D (1)

D (1)

C (1)

B (1)

C (1)

B (1)

11 Chu trnh my lnh 1 cp nn hi dng gas lnh R134a. Qu trnh 3-4 i qua van tit lu l: A/ Qu trnh tit lu. B/ Qu trnh on nhit. C/ Qu trnh ng enthalpy. D/ C ba p n cn li u ng. 12 Chu trnh my lnh 1 cp nn hi dng gas lnh R134a. Qu trnh 3-4 i qua van tit lu l: A/ Qu trnh tit lu.

D (1)

D (1)

B/ Qu trnh on nhit. C/ Qu trnh ng enthalpy. D/ C ba p n cn li u ng. Chng : 1. Cc ni dung kin thc ti thiu m sinh vin phi nm vng sau khi hc xong chng 8 1.1 Hiu c cac khai nim, thut ng hay inh nghia v: Khng khi kh, khng khi m, khng khi m bao hoa, khng khi m cha bao hoa, m tuyt i, m tng i, cha hi. 1.2 Hiu va vn dung c cng thc th hin mi quan h gia cha hi, m tng i va phn ap sut bao hoa cua hi nc. 2. Cc mc tiu kim tra nh gi v dng cu hi kim tra nh gi gi chng 8 Stt Mc tiu kim tra nh gi Ni dung Dng cu hi Khng khi kh, khng Cu hi nhiu la chn khi m, khng khi m Mc Nh c cc kin thc bao hoa, khng khi m 1 mc 1 cha bao hoa, m tuyt i, m tng i, cha hi Hiu mi quan h gia Cu hi nhiu la chn cha hi, m Mc Hiu c cc kin thc 2 tng i va phn ap hc mc 1 sut bao hoa cua hi nc. Vn dng tnh ton Cu hi nhiu la chn cha hi, m tng Kh nng vn dng cc kin thc 3 i va enthalpy cua hc mc 1 khng khi m mt trang thai nao o. 3. Ngn hng cu hi v p n chi tit chng 8 Cu hi v p n tt 1 Khng kh m c khi lng l 10kg, cha m l 10g/(kg kkk) th khi lng khng kh kh l: A/ 9 kg B/ 9,9 kg C/ 10,1 kg D/ 11 kg 2 Khng kh m c sng m l: A/ Khng kh m cha bo ha B/ Khng kh m bo ha C/ Khng kh m qu bo ha D/ C 3 p n khc u sai 3 Khi nc bay hi on nhit vo khng kh m cha bo ha th: A/ nhit khng kh m khng i B/ nhit khng kh m gim C/ enthalpy khng kh m khng i D/ enthalpy khng kh m gim 4 Enthalpy ca khng kh m tnh theo cng thc: A/ H = cp,kk.t + (r + cp,w.t).d B/ H = t + (2451 + 2.t) C/ H = cp,kk.t + (r + cp,w.t) D/ H = cv,kk.t + (r + cv,w.t).d 5 cha m c th tnh theo cng thc:

p n (trng s im) B (1)

C (1)

B (1)

A (1)

B (1)

A/

B/ C/ D/ C 3 p n khc u sai

6 Cho th H-d nh hnh v. Trng thi khng kh l im A. Nhit ng sng l:

D (1)

A/ t1 B/ t2 C/ t3 D/ t4 7 Cho th H-d nh hnh v. Trng thi khng kh l im A. Nhit bo ha on nhit l:

B (1)

A/ t1 B/ t2 C/ t3 D/ t4 8 Cho th H-d nh hnh v. Trng thi khng kh l im A. Ap sut bo ha ca hi nc l:

A (1)

A/ p1 B/ p2 C/ p3 D/ p4 9 Cho th H-d nh hnh v. Trng thi khng kh l im A. Ap sut ca hi nc l:

D (1)

A/ B/ C/ D/

p1 p2 p3 p4 B (1)

10 Trn th H-d cho khng kh m; ng t1 = 35 oC; t2 = 55 oC. dc ca: A/ t1 ln hn B/ t2 ln hn C/ t1 v t2 dc nh nhau D/ C 3 p n khc u sai

Chng : 1. Cc ni dung kin thc ti thiu m sinh vin phi nm vng sau khi hc xong chng 9 1.1 Hiu c cac khai nim, thut ng hay inh nghia v: Trng nhit , mt ng nhit va gradiant nhit , h s dn nhit, iu kin n tri, iu kin bin 1.2 Hiu va vn dung c cng thc tnh mt dong nhit: Vach phng 1 lp, vach phng nhiu lp, vach tru 1 lp va vach tru nhiu lp. 2. Cc mc tiu kim tra nh gi v dng cu hi kim tra nh gi gi chng 9 Stt Mc tiu kim tra nh gi Ni dung Dng cu hi Trng nhit , mt Cu hi nhiu la chn ng nhit va gradiant Mc Nh c cc kin thc 1 nhit , h s dn mc 1 nhit, iu kin n tri, iu kin bin. Hiu c cng thc Cu hi nhiu la chn tnh mt dong nhit Mc Hiu c cc kin thc cua vach phng 1 lp, 2 hc mc 1 vach phng nhiu lp, vach tru 1 lp va vach tru nhiu lp. Kh nng vn dng cc kin thc Vn dng cng thc tnhCu hi nhiu la chn 3 hc mc 1 mt dong nhit. Xem xet bai toan cho Cu hi nhiu la chn loai iu kin bin gi. 4 Kh nng phn tch Vach tinh toan la loai vach gi. Yu cu cua bai toan. Cac bai toan dang tim Cu hi nhiu la chn mt dong nhit, tim nhit b mt vach, 5 Kh nng tng hp: tim nhit b mt vach th i, h s dn nhit va b day cach nhit. So snh cac cng thc Cu hi nhiu la chn 6 Kh nng so snh, nh gi: tinh mt dong nhit cua cac loai vach. 3. Ngn hng cu hi v p n chi tit chng 9 Cu hi v p n tt 1 Hnh di biu th cc mt ng nhit no ng:


A/ B/ C/ D/ 2

Cc mt ng nhit t1, t2 Cc mt ng nhit t2, t3 Cc mt ng nhit t3, t1 Cc mt ng nhit t1, t2, t3 A (1)

nh lut Fourier q= - .gradt c: A/ Chiu dng nhit q ngc chiu vi gradt B/ n v o ca h s dn nhit l w/m2 C/ n v o ca q l w/(m2.) D/ n v o ca gradt l oC/m2.

3 Phng trnh vi phn dn nhit trong h ta Cc: v o ca qv l: A/ J/m B/ J/m2 C/ J/m3 D/ W/m3 c n

D (1)

4 iu kin n tr c chia lm my loi? A/ 1 loi B/ 2 loi C/ 3 loi D/ 4 loi 5 C my loi iu kin bin? A/ 1 loi B/ 2 loi C/ 3 loi D/ 4 loi 6 iu kin bin loi 3 cho bit trc: A/ Nhit b mt vt rn B/ Dng nhit i qua b mt vt rn C/ Nhit cht lng chy qua b mt vt rn D/ Nhit tip xc gia cc vch rn 7 Trao i nhit dn nhit c iu kin bin loi 1 l: A/ Cho bit qui lut trao i nhit trn b mt vt rn vi cht lng. B/ Cho bit nhit trn b mt vt rn. C/ Cho bit tip xc l tng gia hai b mt vt rn. D/ Cho bit mt dng nhit truyn qua b mt vch rn. 8 Trao i nhit dn nhit c iu kin bin loi 2 l: A/ Cho bit qui lut trao i nhit trn b mt vt rn vi cht lng. B/ Cho bit nhit trn b mt vt rn. C/ Cho bit tip xc l tng gia hai b mt vt rn. D/ Cho bit mt dng nhit truyn qua b mt vch rn. 9 Trao i nhit dn nhit c iu kin bin loi 3 l: A/ Cho bit qui lut trao i nhit trn b mt vt rn vi cht lng. B/ Cho bit nhit trn b mt vt rn. C/ Cho bit tip xc l tng gia hai b mt vt rn. D/ Cho bit mt dng nhit truyn qua b mt vch rn. 10 Trao i nhit dn nhit c iu kin bin loi 4 l: A/ Cho bit qui lut trao i nhit trn b mt vt rn vi cht lng. B/ Cho bit nhit trn b mt vt rn. C/ Cho bit tip xc l tng gia hai b mt vt rn. D/ Cho bit mt dng nhit truyn qua b mt vch rn. 11 Dng nhit i qua vch phng 1 lp bng dn nhit n nh, iu kin bin loi mt c tnh theo cng thc (tw1>tw2):

D (1)

D (1)

C (1)

B (1)

D (1)

A (1)

C (1)

A (1)

A/

;

B/

;

C/

;

D/ ; 12 Dng nhit i qua vch phng n lp bng dn nhit n nh, iu kin bin loi mt c tnh theo cng thc (twn+1>tw1):

D (1)

A/

;

B/

;

C/

;

D/ ; 13 Dng nhit i qua vch tr 1 lp bng dn nhit n nh, iu kin bin loi mt c tnh theo cng thc (tw1>tw2):

A (1)

A/

;

B/

;

C/

;

D/ ; 14 Mt dng nhit truyn qua vch phng rng q=8000W/m2, nhit b mt trong v b mt ngoi duy tr khng i t1=100oC, t2=90oC, h s dn nhit =40W/ (m.oC/. Chiu dy (mm) ca vch bng: A/ 30 B/ 40 C/ 50 D/ 60 15 Mt dng nhit truyn qua vch phng rng q=450W/m2, nhit b mt trong v b mt ngoi duy tr khng i t1=450oC, t2=50oC, h s dn nhit (m.oC/. Chiu dy A/ 355 B/ 405 C/ 450 D/ 460 (mm) ca vch bng: =0,40W/

C (2)

A (2)

16 Tnh b dy vch thp (mm) ca l hi, bit chnh nhit pha trong v pha ngoi ca vch t=200oC, mt dng nhit truyn qua vch q=50000 W/m2, h s dn nhit A/ 200 B/ 190 C/ 175 D/ 160 =40W/(m.). (Coi vch ni hi l vch phng).

D (2)

17 Tnh b dy vch thp (mm) ca l hi, bit chnh nhit pha trong v pha ngoi ca vch t=120oC, mt dng nhit truyn qua vch q=55000 W/m2, h s dn nhit A/ 120 B/ 108 C/ 98 D/ 92 =45W/(m.). (Coi vch ni hi l vch phng).

C (2)

18 Tng phng l hi c cu to bng hai lp vt liu, lp gch samt dy 1=120mm, lp gch dy 2=250mm, h s dn nhit 1=0,93W/(m.), 2=0,7W/(m.), bit nhit trong cng v b mt ngoi cng vn duy tr khng i l 1000oC v 50oC. Tnh mt dng nhit q (W/m2) bng:

B (2)

A/ B/ C/ D/

2014 1954 1904 1850 D (2)

19 Tng phng l hi c cu to bng hai lp vt liu, lp gch samt dy 1=150mm, lp gch dy 2=300mm, h s dn nhit 1=0,93W/(m.), 2=0,7W/(m.), bit nhit trong cng v b mt ngoi cng vn duy tr khng i l 1500oC v 70oC. Tnh mt dng nhit q (W/m2) bng: A/ 2406 B/ 2500 C/ 2450 D/ 2424 20 Tng phng l hi c cu to bng hai lp vt liu, lp gch samt dy 1=100mm, lp gch dy 2=200mm, h s dn nhit 1=0,93W/(m.), 2=0,7W/(m.), bit nhit trong cng v b mt ngoi cng vn duy tr khng i l 900oC v 50oC. Tnh mt dng nhit q (W/m2) bng: A/ 2162 B/ 2258 C/ 2543 D/ 2016 21 Tng phng l hi c cu to bng hai lp vt liu, lp gch samt dy 1=200mm, lp gch dy 2=300mm, h s dn nhit 1=0,65W/(m.), 2=0,75W/(m.), bit nhit trong cng v b mt ngoi cng vn duy tr khng i l 1200oC v 50oC. Tnh mt dng nhit q (W/m2) bng: A/ 18825 B/ 1725 C/ 1625 D/ 1525 22 Vch bung sy (vch phng) c dng bng hai lp vt liu, lp trong dy 1=250mm, 1=0,93W/(m.), lp vt liu pha ngoi c 2=0,7W/(m.). Nhit b mt trong cng t1=110oC, nhit b mt ngoi cng t3=25oC, mt dng nhit q =110W/m2. Chiu dy lp vt liu th hai A/ 325 B/ 352 C/ 365 D/ 372 2 (mm) bng:

A (2)

C (2)

B (2)

23 Vch bung sy (vch phng) c dng bng hai lp vt liu, lp trong dy 1=300mm, 1=0,93W/(m.), lp vt liu pha ngoi c 2=0,7W/(m.). Nhit b mt trong cng t1=110oC, nhit b mt ngoi cng t3=25oC, mt dng nhit q= 110W/m2. Chiu dy lp vt liu th hai A/ 315 B/ 325 C/ 355 D/ 285 2(mm) bng:

A (2)

24 ch bung sy (vch phng) c dng bng hai lp vt liu, lp trong dy 1=200mm, 1=0,93W/(m.), lp vt liu pha ngoi c 2=0,45W/(m.). Nhit b mt trong cng t1=150oC, nhit b mt ngoi cng t3=35oC, mt dng nhit q= 80W/m2. Chiu dy lp vt liu th hai A/ 450 B/ 500 C/ 550 D/ 469 2 (mm) bng:

C (2)

25 Vch bung sy (vch phng) c dng bng hai lp vt liu, lp trong dy 1=100mm, 1=0,8W/(m.), lp vt liu pha ngoi c 2=0,65W/(m.). Nhit b mt trong cng t1=85oC, nhit b mt ngoi cng t3=35oC, mt dng nhit q= 180W/m2. Chiu dy lp vt liu th hai A/ 105 B/ 115 2 (mm) bng:

C (2)

C/ 99 D/ 90 Chng : 1. Cc ni dung kin thc ti thiu m sinh vin phi nm vng sau khi hc xong chng 10 1.1 Hiu c cac khai nim, thut ng hay inh nghia v: Truyn nhit i lu, chay tng, chay ri, ng dang, i lu t nhin va i lu cng bc. 1.2 Hiu va vn dung c cng thc Newton, cac tiu chun ng dang, phng trinh tiu chun. 2. Cc mc tiu kim tra nh gi v dng cu hi kim tra nh gi gi chng 10 Stt Mc tiu kim tra nh gi Ni dung Dng cu hi Hiu cac khai nim chay Cu hi nhiu la chn Mc Nh c cc kin thc tng, chay ri, ng 1 mc 1 dang, i lu t nhin va i lu cng bc. Cac tiu chun ng Cu hi nhiu la chn Mc Hiu c cc kin thc 2 dang, phng trinh tiu hc mc 1 chun. Vn dng cac phng Cu hi nhiu la chn trinh tiu chun tim cac Kh nng vn dng cc kin thc 3 tiu chun ng dang hc mc 1 xac inh loai trao i nhit i lu. T h s toa nhit hoc Cu hi nhiu la chn bang h s hiu chinh 4 Kh nng phn tch xac inh ch trao i nhit i lu 5 Kh nng tng hp: Cc loi bi ton tm Cu hi nhiu la chn mt dong nhit, nhit vach va h s toa nhit. So snh mt dong Cu hi nhiu la chn nhit gia ch i lu t nhin va i lu cng bc, gia chay tng va chay ri.

6

Kh nng so snh, nh gi:

3. Ngn hng cu hi v p n chi tit chng 10 Cu hi v p n tt 1 Khi cht lu chy tng v chy ri th mt dng nhit trao i nhit i lu: A/ Khi chy tng cao hn B/ Khi chy ri cao hn C/ Ph thuc vo cht lu m chy ri hay chy tng cao hn D/ C 3 p n cn li u sai 2 H s ta nhit i lu c th nguyn l: A/ W/(m2.); B/ W/m2; C/ J/(m2.); D/ W/(m.); 3 Tiu chun Nusselt c tnh theo cng thc: A/ B/ C/ D/ ; ; ; ; ngi ta tnh:


A (1)

B (1)

4 xc nh h s ta nhit i lu A/ Tiu chun Nusselt Nu B/ Tiu chun Reynolds Re

A (1)

C/ Tiu chun Grashoff Gr D/ Tiu chun Prant Pr 5 L thuyt ng dng ra i do: A/ C nhiu hin tng vt l ng dng vi nhau B/ C s ng dng nhit v in C/ C s ng dng hnh hc D/ Khng xc nh c gi tr h s ta nhit i lu 6 Tiu chun Reynolds c tnh theo cng thc: A/ B/ C/ ; ; ;

D (1)

bng l thuyt. B (1)

D/ ; 7 Tiu chun Reynolds c trng ch yu cho yu t no? A/ c trng cho s trao i nhit gia vch rn v cht lu. B/ c trng cho ch chuyn ng ca cht lu. C/ c trng cho mc chuyn ng t nhin ca cht lu. D/ c trng cho tnh cht vt l ca cht lu. 8 Tiu chun Grashoff c tnh theo cng thc: A/ ;

B (1)

C (1)

B/ C/

; ;

D/ ; 9 Tiu chun Grashoff c trng ch yu cho yu t no? A/ c trng cho s trao i nhit gia vch rn v cht lu. B/ c trng cho ch chuyn ng ca cht lu. C/ c trng cho mc chuyn ng t nhin ca cht lu. D/ c trng cho tnh cht vt l ca cht lu. 10 Tiu chun Prandtl c tnh theo cng thc: A/ B/ C/ ; ; ;

C (1)

D (1)

D/ ; 11 Tiu chun Prandtl c trng ch yu cho yu t no? A/ c trng cho s trao i nhit gia vch rn v cht lu. B/ c trng cho ch chuyn ng ca cht lu. C/ c trng cho mc chuyn ng t nhin ca cht lu. D/ c trng cho tnh cht vt l ca cht lu. 12 Trong trao i nhit i lu tiu chun ng dng no trong trao i nhit i lu c trng cho ch trao i nhit gia b mt vt rn vi cht lu. A/ Nusselts. B/ Reynolds. C/ Grashoff.

D (1)

A (1)

D/ Prandtl. 13 Trong trao i nhit i lu tiu chun ng dng no c trng cho t s gia lc B qun tnh v lc nht. (1) A/ Nusselts. B/ Reynolds. C/ Grashoff. D/ Prandtl. 14 Trong trao i nhit i lu tiu chun ng dng no c trng cho lc nng do khc bit mt . A/ Nusselts. B/ Reynolds. C/ Grashoff. D/ Prandtl. 15 Trong trao i nhit i lu tiu chun ng dng no c trng cho mc ng D dng ca trng vn tc v trng nhit . (1) A/ Nusselts. B/ Reynolds. C/ Grashoff. D/ Prandtl. 16 Hai hin tng vt l l ng dng vi nhau khi: D A/ Kch thc hnh hc ng dng (1) B/ Tiu chun xc nh cng tn bng nhau tng i mt C/ iu kin n tr ng dng D/ C 3 p n cn li u ng Chng : 1. Cc ni dung kin thc ti thiu m sinh vin phi nm vng sau khi hc xong chng 11 1.1 Hiu c cac khai nim, thut ng hay inh nghia v: Vt en tuyt i, vt trng tuyt i, vt trong tuyt i, nng sut bc xa ban cu, bc xa hiu dung, bc xa hiu qua. 1.2 Hiu va vn dung c cng thc inh lut Planck, inh lut Stefan - boltzmann, inh lut Kirchoff, mt dong nhit qua cac vach. 2. Cc mc tiu kim tra nh gi v dng cu hi kim tra nh gi gi chng 11 Stt Mc tiu kim tra nh gi Ni dung Dng cu hi Vt en tuyt i, vt Cu hi nhiu la chn trng tuyt i, vt trong Mc Nh c cc kin thc 1 tuyt i, nng sut bc mc 1 xa ban cu, bc xa hiu dung, bc xa hiu qua. Hiu inh lut Planck, Cu hi nhiu la chn Mc Hiu c cc kin thc inh lut Stefan 2 hc mc 1 boltzmann, inh lut Kirchoff Vn dng cng thc tnhCu hi nhiu la chn inh lut Planck, inh lut Stefan - boltzmann, Kh nng vn dng cc kin thc 3 inh lut Kirchoff tim hc mc 1 nng sut bc xa, nhit vt va bc song bc xa cc ai. 3. Ngn hng cu hi v p n chi tit chng 11 Cu hi v p n tt 1 Bc sng ca tia nhit nm trong gii: A/ 0,4 40 m B/ 0,4 400 m C/ 0,4 40 mm D/ 0,4 400 mm Vt en tuyt i l vt c: A/ A=1 B/ R=1 C/ D=1 D/ A + D=1 Vt trng tuyt i l vt c:


2

A (1)

3

B

A/ A=1 B/ R=1 C/ D=1 D/ A + D=1 4 Vt trong tuyt i l vt c: A/ A=1 B/ R=1 C/ D=1 D/ A + D=1 5 Dng bc x c n v o l: A/ J B/ W C/ J/m2 D/ W/m2 6 Nng sut bc x c n v o l: A/ J B/ W C/ J/m2 D/ W/m2 7 Nng sut bc x hiu dng tnh theo cng thc:

(1)

C (1)

B (1)

D (1)

B (1)

A/ B/ Ehd=E + (1 - A/.Et

C/ D/ Ehd=E + A.Et 8 nh lut Planck:

C (1) ;

A/

B/

;

C/

;

D/ ; 9 Hng s Planck th nht C1 c tr s bng: A/ ; B/ 2,898.10-3m.K; C/ 1,4388.10-2m.K; D/ 0,374.10-15W.m2; 10 Hng s Planck th hai C2 c tr s bng: A/ B/ 2,898.10-3m.K; ;

D (1)

C (1)

C/ 1,4388.10-2m.K; D/ 0,374.10-15W.m2; 11 nh lut Stefan-Boltzmann:

D (1)

A/

;

B/

;

C/

;

D/ ; 12 Hng s bc x o ca vt en tut i bng: A/ 5,67.10-8W/(m2.K4) B/ 5,67.10-8W/(m2.K) C/ 5,67W/(m2.K4) D/ 5,67W/(m2.K) 13 H s bc x Co ca vt en tut i bng: A/ 5,67.10-8W/(m2.K4) B/ 5,67.10-8W/(m2.K) C/ 5,67W/(m2.K4) D/ 5,67W/(m2.K) 14 nh lut Kirchoff cho vt xm cho bit: A/ Nng lng bc x ring ca vt ln hn nng lng bc x hp th B/ Nng lng bc x ring ca vt nh hn nng lng bc x hp th C/ Nng lng bc x ring ca vt bng nng lng bc x hp th D/ Nng lng bc x ring ca vt bng nng lng bc x hp th khi cn bng nhit 15 Cho 2 vch phng song song, di v rng v hn. Nhit cc vch ln lt l T1 v T2 khng i. H s hp th v en ln lt l A1, A2, 1, 2 khng i. Mi trng gia 2 tm l trong sut. Nng sut bc x ti Et n vch th nht bng: A/ B/ C/ ; ; ;

A (1)

C (1)

D (1)

D (1)

D/ ; 16 Cho 2 vch phng song song, di v rng v hn. Nhit cc vch ln lt l T1 v T2 khng i. H s hp th v en ln lt l A1, A2, 1, 2 khng i. Mi trng gia 2 tm l trong sut. Nng sut bc x ti Et n vch th hai bng: A/ B/ C/ ; ; ;

D (1)

D/ ; 17 Trao i nhit bc x gia 2 vch phng song song khng c mn chn, t trong mi trng trong sut c tnh theo cng thc:

D (1)

A/

;

B/

;

C/

;

D/ ; 18 H s bc x ca h thng trao i nhit bc x gia 2 tm phng song song tnh theo cng thc:

A (1)

A/

;

B/

;

C/

;

D/ ; 19 H s bc x ca h thng trao i nhit bc x gia 2 tm phng song song c gi tr ln nht bng A/ 5,67; B/ 1; C/ 5,67*10-8; D/ 0,5; :

A (1)

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