Tutorial Problems 32.11. The number of turns on the primary and secondary windings of a 1-0 transformer are 350 and 35respectively. If the primary is connected to a 2.2 kV, 50-Hz supply, determine the secondary voltage1220 V] (Elect. Engg.-II, Kerala Univ. 1980on no-load.2. A 3000/200-V, 50-Hz, 1-phase transformer is built on a core having an effective cross-sectional areaof 150 cm" and has 80 turns in the low-voltage winding. Calculate(a) the value of the maximum flux density in the core[(a) 0.75 Wb/m" (b) 1200](b) the number of turns in the high-voltage winding.3. A3,300/230-V, 50-Hz, 1-phase transformer is to be worked at a maximum flux density of 1.2 Wb/m?in the core. The effective cross-sectional area of the transformer core is 150 cm. Calculate suitablevalues of primary and secondary turns.4. A 40-kVA, 3,300/240-V, 50 Hz, 1-phase transformer has 660 turns on the primary. Determine[830; 58](a) the number of turns on the secondary(b) the maximum value of flux in the core(c) the approximate value of primary and secondary full-load currents.Internal drops in the windings are to be ignored.S. A double-wound, 1-phase transformer is required to step down from 1900 V to 240 V, 50-Hz. It isto have 1.5 V per turn. Calculate the required number of turns on the primary and secondary windingsrespectively.The peak value of flux density is required to be not more than 1.2 Wb/m. Calculate the requiredcross-sectional area of the steel core. If the output is 10 kVA, calculate the secondary current.[(a) 48 (b) 22.5 mWb (c) 12.1 A; 166.7 AJ[1,267; 160; 56.4 cm"; 41.75 A]6. The no-load voltage ratio in a l-phase, 50-Hz, core-type transformer is 1,200/440. Find the numberof turns in each winding if the maximum flux is to be 0.075 Wb.[24 and 74 turns]7. A l-phase transformer has 500 primary and 1200 secondary turns. The net cross-sectional area ofthe core is 75 cm". If the primary winding be connected to a 400-V, 50 Hz supply, calculate.(i) the peak value of flux density in the core and (ii) voltage induced in the secondary winding.(0.48 Wb/m; 60 V]8. A 10-kVA, 1-phase transformer has a turn ratio of 300/23. The primary is connected to a 1500-V,60 Hz supply. Find the secondary volts on open-circuit and the approximate values of the currentsin the two windings on full-load. Find also the maximum value of the flux. [115 V; 6.67 A; 87 A;11.75 mWb]9. A 100-kVA, 3300/400-V, 50 Hz, 1 phase transformer has 110 turns on the secondary. Calculate theapproximate values of the primary and secondary full-load currents, the maximum value of flux in thecore and the number of primary turns.How does the core flux vary with load ?10. The no-load current of a transformer is 5.0 A at 0.3 power factor when supplied at 230-V, 50-Hz. Thenumber of turns on the primary winding is 200. Calculate (i) the maximum value of flux in the core (ii)the core loss (ii) the magnetising current.11. The no-load current of a transformer is 15 at a power factor of 0.2 when connected to a 460-V, 50-Hzsupply. If the primary winding has 550 turns, calculate(a) the magnetising component of no-load current(b) the iron loss(c) the maximum value of the flux in the core.12. The no-load current of a transformer is 4.0 A at 0.25 p.f. when supplied at 250-V, 50 Hz. The numberof turns on the primary winding is 200. Calculate(i) the r.m.s. value of the flux in the core (assume sinusoidal flux)[30.3 A; 250 A; 16.4 mWb; 907][5.18 mWb; 345 W; 4.77 A][(a) 14.7 A (b) 1,380 W (c) 3.77 mWb](ii) the core loss(iii) the magnetising current.[6) 3.96 mWb (i) 250 W (iii) 3.87 A]

Question

Tutorial Problems 32.11. The number of turns on the primary and secondary windings of a 1-0 transformer are 350 and 35respectively. If the primary is connected to a 2.2 kV, 50-Hz supply, determine the secondary voltage1220 V] (Elect. Engg.-II, Kerala Univ. 1980on no-load.2. A 3000/200-V, 50-Hz, 1-phase transformer is built on a core having an effective cross-sectional areaof 150 cm&#34; and has 80 turns in the low-voltage winding. Calculate(a) the value of the maximum flux density in the core[(a) 0.75 Wb/m&#34; (b) 1200](b) the number of turns in the high-voltage winding.3. A3,300/230-V, 50-Hz, 1-phase transformer is to be worked at a maximum flux density of 1.2 Wb/m?in the core. The effective cross-sectional area of the transformer core is 150 cm. Calculate suitablevalues of primary and secondary turns.4. A 40-kVA, 3,300/240-V, 50 Hz, 1-phase transformer has 660 turns on the primary. Determine[830; 58](a) the number of turns on the secondary(b) the maximum value of flux in the core(c) the approximate value of primary and secondary full-load currents.Internal drops in the windings are to be ignored.S. A double-wound, 1-phase transformer is required to step down from 1900 V to 240 V, 50-Hz. It isto have 1.5 V per turn. Calculate the required number of turns on the primary and secondary windingsrespectively.The peak value of flux density is required to be not more than 1.2 Wb/m. Calculate the requiredcross-sectional area of the steel core. If the output is 10 kVA, calculate the secondary current.[(a) 48 (b) 22.5 mWb (c) 12.1 A; 166.7 AJ[1,267; 160; 56.4 cm&#34;; 41.75 A]6. The no-load voltage ratio in a l-phase, 50-Hz, core-type transformer is 1,200/440. Find the numberof turns in each winding if the maximum flux is to be 0.075 Wb.[24 and 74 turns]7. A l-phase transformer has 500 primary and 1200 secondary turns. The net cross-sectional area ofthe core is 75 cm&#34;. If the primary winding be connected to a 400-V, 50 Hz supply, calculate.(i) the peak value of flux density in the core and (ii) voltage induced in the secondary winding.(0.48 Wb/m; 60 V]8. A 10-kVA, 1-phase transformer has a turn ratio of 300/23. The primary is connected to a 1500-V,60 Hz supply. Find the secondary volts on open-circuit and the approximate values of the currentsin the two windings on full-load. Find also the maximum value of the flux. [115 V; 6.67 A; 87 A;11.75 mWb]9. A 100-kVA, 3300/400-V, 50 Hz, 1 phase transformer has 110 turns on the secondary. Calculate theapproximate values of the primary and secondary full-load currents, the maximum value of flux in thecore and the number of primary turns.How does the core flux vary with load ?10. The no-load current of a transformer is 5.0 A at 0.3 power factor when supplied at 230-V, 50-Hz. Thenumber of turns on the primary winding is 200. Calculate (i) the maximum value of flux in the core (ii)the core loss (ii) the magnetising current.11. The no-load current of a transformer is 15 at a power factor of 0.2 when connected to a 460-V, 50-Hzsupply. If the primary winding has 550 turns, calculate(a) the magnetising component of no-load current(b) the iron loss(c) the maximum value of the flux in the core.12. The no-load current of a transformer is 4.0 A at 0.25 p.f. when supplied at 250-V, 50 Hz. The numberof turns on the primary winding is 200. Calculate(i) the r.m.s. value of the flux in the core (assume sinusoidal flux)[30.3 A; 250 A; 16.4 mWb; 907][5.18 mWb; 345 W; 4.77 A][(a) 14.7 A (b) 1,380 W (c) 3.77 mWb](ii) the core loss(iii) the magnetising current.[6) 3.96 mWb (i) 250 W (iii) 3.87 A]

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1. The number of turns on the primary and secondary windings of a 1-0 transformer are 350 and 35 respectively. If the primary is connected to a 2.2 kV, 50-Hz supply, determine the secondary voltage on no-load. [220 V] (Elect. Engg.-II, Kerala Univ. 1980