Mehlala e 23 ea lipotso tsa transformer Transformers
1. Transformer e na le dikhoele tsa mantlha le tsa bobedi tse nang le diphetoho tse 500 le tse 5000 ka ho latellana, tse hokahantsweng le netweke ya motlakase e fapanyetsanang ya 220 V. Motlakase o tswang ke ofe?
A. 220 volt
B. Li-volt tse 1.100
C. Li-volt tse 2.200
D. Li-volt tse 22.000
Puisano
Hoa tsebahala hore:
Khoele ea mantlha (NP= 500 khoele
Koele ea bobeli (N)s= 5000 khoele
Motlakase oa mantlha (V)P) = Li-volt tse 220
O botsitse: Motlakase oa bobeli (V)S)
Karabo:
Foromo ea transformer:
Vs / N s = V p / N p
Vs / 5000 = 220 / 500
Vs / 5000 = 0,44
Vs = (0,44) ( 5000)
Vs = Li-volt tse 2.200
Karabo e nepahetseng ke C.
2. Mosebetsi oa transformer ke ho...
A. motlakase o fetolang le matla
B. ho fetola motlakase oa hona joale o fapanyetsanang
C. molaoli oa motlakase oa hona joale o tobileng
D. etsa hona joale e tobileng ho ba hona joale e fapanyetsanang
Puisano
Li-transformer li sebetsa ho fetola motlakase oa motlakase o fetohang (AC). Ho na le mefuta e 'meli ea li-transformer: li-transformer tse nyolohang le li-transformer tse theohelang. Li-transformer tse nyolohang li eketsa motlakase, ha li-transformer tse theohelang li fokotsa motlakase.
Karabo e nepahetseng ke B.
3. Ka har'a transformer ho na le khoele ea mantlha e nang le liphetho tse 1200 le khoele ea bobeli e nang le liphetho tse 1000. Haeba hona joale ea mantlha e le 4 A, joale matla a hona joale ea bobeli ke...
A. 2 Li-ampere
B. 3 Ampere
C. 4 Ampere
D. 4,8 Ampere
Puisano
Hoa tsebahala hore:
Koili ea mantlha (N)P) = makhetlo a 1200
Koele ea bobeli (N)S) = makhetlo a 1000
Matla a hona joale a mantlha (I)P) = 4 Ampere
O botsitse: Matla a bobeli a hona joale (I)S)
Karabo:
Foromo ea transformer e bolelang kamano pakeng tsa palo ea li-coil returns (N) le motlakase oa motlakase (I) ke:
Ke S / Ke P = N P / N S
Matla a bobeli a hona joale ke:
IS/ 4 = 1200/ 1000
IS/ 4 = 1,2
1 S = 1,2 (4)
I S = 4,8 Ampere
Karabo e nepahetseng ke D.
4. Ha ho ralwa transformer, ho hlahisa motlakase oa bobeli oa li-volts tse 220 ho tsoa motlakaseng oa mantlha oa li-volts tse 110, karolelano ea palo ea liphetho tsa bobeli ho ea ho liphetho tsa mantlha ke...
K. 2: 3
B. 3: 2
C. 6 : l2
D. 12: 6
Puisano
Hoa tsebahala hore:
Motlakase oa bobeli (V)S) = Li-volt tse 220
Motlakase oa mantlha (V)P) = Li-volt tse 110
E botsitsoe : Karolelano ea palo ea liphetho tsa bobeli ho palo ea liphetho tsa mantlha (NS/NP)
Karabo:
Foromo ea transformer e bolelang kamano pakeng tsa motlakase oa motlakase le palo ea li-coil returns ke:
VS/VP = NS/NP
220/110 = NS/NP
22/11 = NS/NP
12/6 = NS/NP
Karabo e nepahetseng ke D.
5. Sheba setšoantšo sa transformer se ka tlase!
Motlakase o ka sehloohong oa transformer ke…
A. 24 Volt
B. 240 Volt
C. 264 Volt
D. 340 Volt
Puisano
Hoa tsebahala hore:
Motlakase oa bobeli (V)S) = Li-volt tse 24
Ho kobeha ha mantlha (N)P kapa N1) = 11 N
Ho kobeha ha bobeli (N)S kapa N2) = 1 N = N
O botsitse: Motlakase oa mantlha (V)P)
Karabo:
Foromo ea transformer:
Vs / N s = V p / N p
Motlakase oa mantlha o baloa ho sebelisoa foromo e kaholimo:
Vs / N s = V p / N p
24 / N = V p / 11 N
24 / 1 = V p / 11
24 = V p / 11
V p = (24)(11)
Vp = Li-volt tse 264
Karabo e nepahetseng ke C.
6. Sheba setšoantšo se ka tlase! Boholo ba motlakase oa transformer ke...
A. 140 Volt
B. 180 Volt
C. 630 Volt
D. 720 Volt
Puisano
Hoa tsebahala hore:
Ho kobeha ha mantlha (N)1) = 21N
Ho kobeha ha bobeli (N)2) = 3N
Motlakase oa bobeli (V)2) = Li-volt tse 20
O botsitse: Motlakase oa mantlha (V)1)
Karabo:
Foromo ea transformer:
V2 / N2 =V1 / N1
Motlakase oa mantlha o baloa ho sebelisoa foromo e kaholimo:
20 / 3N = V1 / 21N
20 / 1 = V 1 / 7
20 = V 1 / 7
V 1 = (7)(20)
V 1 = 140 Volt
Karabo e nepahetseng ke A.
7. Tse latelang ke litšobotsi tsa transformer ea step-up...
A. Motlakase o ka sehloohong o moholo ho feta motlakase oa bobeli
B. Palo ea likhoele tsa mantlha e ka tlase ho palo ea likhoele tsa bobeli.
C. Motlakase o ka har'a khoele ea mantlha o monyane ho feta oa hona joale o ka har'a khoele ea bobeli.
D. Matla a khoele ea bobeli a feta matla a khoele ea mantlha.
Puisano
Transformer ke sesebelisoa se fetolang motlakase o fetohang hore e be motlakase o fetohang. Li-transformer li tla ka mefuta e 'meli: transformer e nyolohang ka mohato dan tao transformer e theohelang fatše.
Transformer e nyolohang ka kgato e sebetsa ho eketsa motlakase hore motlakase wa bobedi o be moholo ho feta motlakase wa mantlha, ka lehlakoreng le leng transformer e theohang ka kgato e sebetsa ho fokotsa motlakase hore motlakase wa bobedi o be monyane ho feta motlakase wa mantlha.
Transformer e nyolohang ka mehato, palo ea lipotoloho tsa coil ea bobeli e feta palo ea lipotoloho tsa coil ea mantlha, ka lehlakoreng le leng transformer e theohelang ka mehato, palo ea lipotoloho tsa coil ea bobeli e ka tlase ho palo ea lipotoloho tsa coil ea mantlha.
Karabo e nepahetseng ke B.
8. Litšobotsi tsa transformer ea step-up ke...
A. motlakase oa mantlha o moholo ho feta motlakase oa bobeli
B. ho na le dipheta-pheto tse ngata tsa mantlha ho feta dipheta-pheto tse ding
C. motlakase oa mantlha o monyane ho feta motlakase oa bobeli
D. Ho kobeha ha mantlha ho tšoana le ho kobeha ha bobeli
Puisano
Transformer ke sesebelisoa sa ho fetola motlakase o fetohang (AC). Ho na le mefuta e 'meli ea li-transformer: li-transformer tse nyolohang le li-transformer tse theohelang. Li-transformer tse nyolohang li eketsa motlakase, ha li-transformer tse theohelang li fokotsa motlakase.
Litšobotsi tsa transformer ea step up ke:
– Motlakase oa mantlha o monyane, motlakase oa bobeli o moholo
– ho fokotseha ha dikotlo tsa pele, ho fokotseha ha dikotlo tsa bobedi
Litšobotsi tsa transformer ea step down ke:
– Motlakase oa mantlha o moholo, motlakase oa bobeli o monyane
– ho kgutlela ho eketsehileng ha mantlha, ho kgutlela ho fokolang ha bobedi
Karabo e nepahetseng ke C.
9. Sheba setshwantsho se latelang sa transformer!
Palo ea liphetho tsa bobeli tsa transformer ke….
A. Metsotso e 550
B. Metsotso e 1.000
C. Metsu e 2.000
D. Metsotso e 10.000
Puisano
Hoa tsebahala hore:
Motlakase oa mantlha (V)P) = Li-volt tse 220
Ho kobeha ha mantlha (N)P) = makhetlo a 200
Motlakase oa bobeli (V)S) = Li-volt tse 1100
O botsitse: Ho kobeha ha bobeli (N)S)
Karabo:
Foromo ea transformer:
Vs / N s = V p / N p
Palo ea ho reteleha ha bobeli e baloa ho sebelisoa foromo e kaholimo:
Vs / N s = V p / N p
Li-volt tse 1100 / Ns = Li-volt tse 220 / ho kgutla ha 200
1100 / N = 220 / 200
1100 / N = 1,1
N = 1100 / 1,1
Ns = Metsotso e 1000
Karabo e nepahetseng ke B.
10. Sheba setshwantsho se latelang sa transformer!
Palo ea liphetho tsa bobeli tsa transformer ke…..
A. Metsotso e 550
B. Metsotso e 1.000
C. Metsu e 2.000
D. Metsotso e 10.000
Puisano
Hoa tsebahala hore:
Motlakase oa mantlha (V)P) = Li-volt tse 220
Ho kobeha ha mantlha (N)P) = makhetlo a 200
Motlakase oa bobeli (V)S) = Li-volt tse 1100
O botsitse: Ho kobeha ha bobeli (N)S)
Karabo:
Foromo ea transformer e bolelang kamano pakeng tsa motlakase le palo ea liphetho ke:
Vs / N s = V p / N p
Ho kobeha ha bobeli ho baloa ho sebelisoa foromo e kaholimo:
Vs / N s = V p / N p
1100 / N = 220 / 200
1100 / N = 22 / 20
1100 / N = 1,1
N S = 1100 / 1,1
N S = 1000
Palo ea liphetho tsa bobeli ke liphetho tse 1000.
Karabo e nepahetseng ke B.
11. Ela hloko lintlha tse latelang tsa transformer!
Ho latela lintlha tse boletsoeng ka holimo, ho ka fihleloa qeto ea hore…
Puisano
Transformer ke sesebelisoa se sebetsang ho eketsa kapa ho fokotsa motlakase oa motlakase oa AC (alternating current). Transformer e sebetsang ho eketsa motlakase e bitsoa transformer. nyoloha 'me transformer e sebetsang ho fokotsa motlakase e bitsoa transformer ho theoha.
Transformer e na le likhoele tse peli tsa terata, e leng khoele ea mantlha (N) le khoele ea bobeli (N).P) le khoele ea bobeli (N)SHo transformer nyolohaNS e kholo ho feta NPHo transformer ho theohaNS e nyane ho feta NPTransformer nyoloha e eketsa motlakase, ka hona motlakase o koeleng ya mantlha o monyane mme motlakase o koeleng ya bobedi o moholo. Ka lehlakoreng le leng, transformer ho theoha ho theola motlakase e le hore motlakase o hodima khoele ya mantlha o be moholo le motlakase o hodima khoele ya bobedi o be monyane.
Transformer A ke transformer ho theoha 'me transformer B ke transformer nyoloha.
Karabo e nepahetseng ke C.
12. Sheba setšoantšo se latelang sa transformer!
Ho tsoa tlhahisoleseding e setšoantšong se kaholimo, polelo e nepahetseng mabapi le setšoantšo sa 1 le setšoantšo sa 2 ka ho latellana ke…
A. Setšoantšo sa 1 ke transformer e nyolohang ka mehato 'me Setšoantšo sa 2 ke transformer e theohelang ka mehato
B. Setšoantšo sa 1 ke transformer e theohelang tlase 'me Setšoantšo sa 2 ke transformer e nyolohelang holimo
C. Setšoantšo sa 1 le sa 2 ke li-transformer tse theohelang tlase
D. Setšoantšo sa 1 le sa 2 ke li-transformer tse nyolohang ka lebelo.
Puisano
Ho transformer nyoloha (booster ea motlakase), motlakase oa mantlha o monyane 'me motlakase oa bobeli o moholo. Ka har'a transformer ho theoha (motlakase o fokotsang motlakase), motlakase oa mantlha o moholo 'me motlakase oa bobeli o monyane.
Transformer e ho Setšoantšo sa 1 e na le motlakase oa mantlha o moholo ho feta motlakase oa bobeli (20 V > 5 V) 'me ka hona ke transformer. ho theohaTransformer e setšoantšong sa 2 e na le motlakase oa mantlha o monyane ho feta motlakase oa bobeli (5 V < 40 V) 'me ka hona ke transformer. nyoloha.
Karabo e nepahetseng ke B.
13. Sheba setšoantšo se latelang sa transformer!
Ho latela setšoantšo se kaholimo, polelo e nepahetseng ke…
A. Transformer I = transformer ea theohang, hobane Ns > Np
B. Transformer I = transformer e nyolohang ka lebelo, hobane Vs <Vp
C. Transformer II = transformer e theohelang tlase, hobane Vp <Vs
D. Transformer II = transformer e nyolohang ka lebelo, hobane Np < Ns
Puisano
Transformer I ke transformer ho theoha hobane Vp > Vs le Np > Ns.
Transformer II ke transformer nyoloha hobane Vp <Vs le Np < Ns.
Karabo e nepahetseng ke D.
14. 
Ela hloko setšoantšo se latelang sa transformer!
Haeba palo ea li-coil reteleha e le N1 = Methati e 100 le N2 = Methati e 250, motlakase V2 ke….
A. 100 Volt
B. 150 Volt
C. 200 Volt
D. 250 Volt
Puisano
Hoa tsebahala hore:
Motlakase o ka sehloohong = Vp =V1 = Li-volt tse 40
Koili ea mantlha = Np = N1 = Metsotso e 100
Koili ea bobeli = Ns = N2 = Metsotso e 250
Potso: Motlakase oa bobeli = Vs =V2
Karabo:
Foromo ea transformer:
Vs / Ns =Vp / Np
Motlakase oa bobeli:
Vs / Ns =Vp / Np
Vs / 250 = 40 / 100
Vs / 250 = 4 / 10
Vs / 250 = 0,4
Vs = (0,4)(250)
Vs = Li-volt tse 100
Karabo e nepahetseng ke A.
15.
Se latelang ke setshwantsho sa moralo sa transformer e loketseng ya enjene e nang le data ya yona. Haeba motlakase o phallang ka hara resistor R e le 4 Amperes, motlakase o phallang ka hara coil ya mantlha ke….
A. 0,8 A
B. 1,6 A
C. 5,0 A
D. 20 A
Puisano
Hoa tsebahala hore:
Koili ea mantlha = Np = N1 = Metsotso e 600
Hona joale ea bobeli = Is = KE2 = Li-ampere tse 4
Koili ea bobeli = Ns = N2 = Metsotso e 120
Potso: Motlakase oa mantlha = Ip = KE1
Karabo:
Foromo ea transformer:
IP Np = KEs Ns
Matla a mantlha a hona joale:
IP Np = KEs Ns
IP (600) = (4)(120)
IP (600) = 480
IP (60) = 48
IP = 48/60
Ip = Li-ampere tse 0,8
Karabo e nepahetseng ke A.
16.
Kea leboha!
Setšoantšong se latelang sa transformer, motlakase oa mantlha ke….
A. 0,1 A
B. 0,2 A
C. 0,8 A
D. 1,6 A
Puisano
Hoa tsebahala hore:
Motlakase o ka sehloohong = Vp =V1 = Li-volt tse 100
Motlakase oa bobeli = Vs =V2 = Li-volt tse 50
Hona joale ea bobeli = Is = KE2 = Li-ampere tse 0,4
Potso: Motlakase oa mantlha = Ip = KE1
Karabo:
Foromo ea transformer:
VP Ip =Vs Is
Matla a mantlha a hona joale:
VP Ip =Vs Is
(100) Kep = (50)(0,4)
(100) Kep = 20
Ip = 20/100
Ip = Li-ampere tse 0,2
Karabo e nepahetseng ke B.
17. Sheba tafole ea tekanyo ea motlakase le ea hona joale bakeng sa transformer e loketseng ka tlase!
Ho latela tafole e kaholimo, boleng ba R le P ke…
A. R = 600 Volts; P = 30 reteleha
B. R = 200 Volts; P = 30 reteleha
C. R = 60 Volts; P = 40 reteleha
D. R = 20 Volts; P = 40 reteleha
E. R = 10 Volts; P = 20 reteleha
Puisano
Foromo ea transformer
Vs Np = Ns Vp le Vp Ip =Vs Is
Lintlha :
Vs = motlakase oa bobeli, Vp = motlakase oa mantlha, Ns = ho kobeha ha bobeli, Np = ho kobeha ha mantlha, Ip = matla a mantlha a hona joale, Is = matla a bobeli a hona joale
Motlakase oa mantlha (V)p)
Vp Ip =Vs Is
Vp (4) = (10)(80)
Vp = 800/4
Vp = R = 200 Volt
Ho kobeha ha bobeli (N)s)
Vs Np = Ns Vp
(10)(600) = Ns (200)
6000 = 200 Ns
Ns = 6000/200
Ns = P = makhetlo a 30
Karabo e nepahetseng ke B.
18. Tafole e latelang e bonts'a lintlha tsa li-transformer tse peli tse loketseng.
Ho latela data e tafoleng e kaholimo, boleng ba K le L ke…
A. K = 1 A le L = Li-volt tse 20
B. K = 2 A le L = 30 Volts
C. K = 3 A le L = 40 Volts
D. K = 4,5 A le L = 53 Volts
E. K = 5 A le L = 30 Volts
Puisano
Sebelisa e 'ngoe ea liforomo tsa transformer ho fumana hore na motlakase oa bobeli oa transformer 1 le motlakase oa bobeli oa transformer 2 ke ofe. Haeba u bala motlakase oa bobeli oa transformer 1, sebelisa data bakeng sa transformer 1, ka mokhoa o ts'oanang haeba u bala motlakase oa bobeli oa transformer 2, sebelisa data bakeng sa transformer 2.
Matla a bobeli a hona joale (I)s) transformer 1
Vp Ip =Vs Is
(200)(3) = (300)(I)s)
Is = 600/300
Is = K = 2 Ampere
Motlakase oa bobeli (V)s) transformer 2
Vp Ip =Vs Is
(40)(0,75) = Vs (1)
Vs = L = 30 Volt
Karabo e nepahetseng ke B.
19. Ela hloko lintlha tsa tekanyo bakeng sa bongata bo 'maloa ho transformer e latelang!
Ho latela data e tafoleng e kaholimo, boleng ba P le Q ke…
A. P = 100 Volts le Q = 4 Amperes
B. P = 100 Volts le Q = 6 Amperes
C. P = 110 Volts le Q = 4 Amperes
D. P = 110 Volts le Q = 2 Amperes
E. P = 220 Volts le Q = 2 Amperes
Puisano
Motlakase oa mantlha (V)p)
Vs Np = Ns Vp
(220)(300) = (600) Vp
(220)(3) = (6) Vp
660 = 6 Vp
Vp = 660/6
Vp = P = 110 Volt
Matla a hona joale a mantlha (I)p)
Vp Ip =Vs Is
(110)(I)p) = (220)(2)
(110)(I)p= 440
Ip = 440/110
Ip = Q = 4 Ampere
Karabo e nepahetseng ke C.
20. Puisano ea lipotso tsa fisiks ea SMA/MA UN - Transformers
1. Transformer e ntle e na le khoele ea eona ea mantlha e hoketsoeng mohloling oa motlakase le khoele ea eona ea bobeli e hoketsoeng lebone joalo ka ha ho bontšitsoe setšoantšong se latelang. Ke polelo efe e nepahetseng?
A. Leseli le tla fifala haeba ho kobeha ha pele ho fokotseha.
B. Lebone le tla khanya haholo haeba ho eketsoa lebili la bobeli.
C. Lebone le tla fifala haeba motlakase o moholo o eketseha.
D. Lebone le tla khanya haholo haeba ho kobeha ha mantlha ho fokotsoa.
E. Khanya kapa ho fifala ha leseli ho tla tšoana leha khoele e ka fetoloa.
Puisano
Ho fetola palo ea li-coil tse potolohang ho itšetlehile feela ka mofuta oa transformer. Haeba palo ea li-coil tse potolohang coil ea mantlha e fokotsehile, e leng se fellang ka li-coil tse ngata tse potolohang coil ea bobeli, transformer e fetoha transformer e nyolohang ka lebelo, e eketsang motlakase. Ka ho tšoanang, haeba palo ea liphetho tse koeleng ea mantlha e eketseha hoo palo ea liphetho tse koeleng ea bobeli e leng tlase, transformer ena e fetoha transformer e theohelang tlaase e sebetsang ho fokotsa motlakase.
Ho bohlokoa ho hopola hore ha motlakase o ntse o eketseha, motlakase oa fokotseha, kahoo motlakase o lula o tsitsitse (P = VI). Matla ke phetoho ea matla a motlakase nakong e itseng. Ha matla a ho kenya a lekana le matla a tlhahiso, bongata ba matla a sebelisitsoeng le bona boa tšoana.
Khanya kapa ho fifala ha leseli ho itshetlehile ka bongata ba matla a motlakase a fetotsweng lesedi. Haeba matla a mangata a motlakase a fetolelwa leseding, lesedi le tla kganya; ka lehlakoreng le leng, haeba feela ho fetolwa leseding, lesedi le tla fifala. Hobane matla a motlakase a bolokilwe, kganya kapa ho fifala ha lesedi ho tla dula ho tshwana.
Karabo e nepahetseng ke E.
21. Setšoantšo se ka tlase se bontša transformer e loketseng. Khoele ea mantlha e hokahantsoe le mohloli oa motlakase 'me khoele ea bobeli e hokahantsoe le lebone (L). Lebone le tla...
A. Khanya e tloaelehileng ha ho fetoloa ho potoloha ha mantlha
B. E fifala ha motlakase oa mantlha o eketseha
C. E khanya haholo haeba ho eketsoa lebili la bobeli.
D. Dimmer haeba ho eketsoa lebili la bobeli
E. E khanya haholo haeba ho kobeha ha mantlha ho fokotsehile.
Puisano
Matla a ho kenya = P = VI = (200 Volts)(2 Ampere) = 400 Watts = Matla a ho hlahisa
Li-transformer li fokotsa motlakase feela empa eseng matla. Matla a ho kenya a lekana le matla a ho ntša, kahoo matla a motlakase a sebelisoang nakong e itseng le 'ona a tšoana. Ka hona, khanya ea leseli e lula e tloaelehile, kapa e sa fetohe.
Karabo e nepahetseng ke A.
Ke tsona tsohle tse tšohloang tsa lipotso tsa mohlala mabapi le li-transformer.
22. Seithuti se batla matla a AC a 18 W. O hokahanya transformer e nang le bokgoni ba 75% le makhetlo a 'maloa a ho potoloha ha 100 le 200 ho betri ea 12 V. Hoa fumaneha hore ha a fumane matla a lakatsehang. O fumana hore matla a AC a...
A. 36 W hobane e hokahanya diphetoho tse 100 le betri.
B. 24 W hobane e hokahanya li-turn tse 200 le betri
C. 12 W hobane e hokahanya li-turn tse 200 le betri
D. 0 W hobane e hokahanya dikhoele tse 200 le betri.
E. 18 W hobane e hokahanya li-turn tse 200 le betri
Puisano
Transformer ke sesebelisoa sa ho eketsa kapa ho fokotsa motlakase oa AC. Libetri ke mohloli oa motlakase oa DC.
Karabo e nepahetseng ke D.
23. Ela hloko tafole e latelang ea transformer!
Polelo e nepahetseng mabapi le li-transformer P le Q ke…
A. P ke transformer e theohelang tlase hobane Is < Ip
B. P ke transformer e nyolohang ka lebelo hobane Vp < Vs
C. Q ke transformer e nyolohang ka lebelo hobane Vp > Vs
D. Q ke transformer e nyolohang ka lebelo hobane Is > Ip
Puisano
P ke transformer e nyolohang ka lebelo hobane motlakase oa mantlha (Vp = 110 V) < motlakase oa bobeli (Vs = 200 V).
Q ke transformer e theohelang ka mohato hobane motlakase oa mantlha (Vp = 220 V) > motlakase oa bobeli (Vs = 110 V).
Karabo e nepahetseng ke B.
Mohloli oa lipotso:
Lipotso tsa Tlhahlobo ea Naha ea Saense ea Sekolo se Phahameng sa Bana ba Banyenyane/Sekolo se Phahameng sa Boislamo
Lipotso tsa Fisiks tsa Tlhahlobo ea Naha bakeng sa Sekolo se Phahameng sa Thuto e Phahameng/Sekolo se Phahameng sa Mosebetsi
Lipotso tsa Fisiks tsa SBMPTN
