4-8 Explain the difference between shunt, com- pound, and differential compound generators a. as to construction b. as to electrical properties
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- Consider an ideal transformer with N1=3000andN2=1000 turns. Let winding 1 be connected to a source whose voltage is e1(t)=100(1| t |)volts for 1t1ande1(t)=0 for | t |1 second. A2- farad capacitor is connected across winding 2. Sketch e1(t),e2(t),i1(t),andi2(t) versus time t.10. In a transformer, the leakage flux of each wind- ing is proportional to the current in that winding because (a) Ohm's law applies to magnetic circuits (b) leakage paths do not saturate (c) the two windings are electrically isolated (d) mutual flux is confined to the core. 11. In a two-winding transformer, the e.m.f.per turn in secondary winding is always.........the induced e.m.f. power turn in primary. (a) equal to K times (b) equal to 1/K times (c) equal to (d) greater than. 12. In relation to a transformer, the ratio 20: 1 indi- cates that (a) there are 20 turns on primary one turn on secondary (b) secondary voltage is 1/20th of primary voltage (c) primary current is 20 times greater than the secondary current. (d) for every 20 turns on primary, there is one turn on secondary.a) Define what the term "permeability" means. Explain why this is an important parameter in designing transformers. b) A maximum current of 60 A flows in a copper conductor with cross-sectional area, A. u7 ond o recistivity of 20 n0. m. A 250 m cable is being used on a 240 V DC circuit to
- Consider the three single-phase two-winding transformers shown in Figure. 3. The high-voltage windings are connected in Y. (a) For the low-voltage side, connect the windings in A, and label the terminals a, b, and c in accordance with the American standard. (b) Relabel the terminals a', b', and c' such that VAN is 90° out of phase with V₂'b' for positive sequence. DI H₂ Figure. 3: Three-Winding TransformerTwo shunt generators A and B operates in parallel and their load characteristicsmay be taken us straight lines. The voltage of the generator A falls from 240 V atno-load to 220 V at 200 A while that of B falls from 245 V at no load to 220 V at150 A. Determine the current which each machine supplies to a common load of300 A and the bus-bar voltage at this load.A 50 Hz, 1-phase transformer has a turn ratio of 6. The resistances are 0.9 ohm and 0.03 ohm and reactances are 5 ohm and 0.13 ohm for high voltage and low voltage windings respectively. Find (i) the voltage to be applied to the h.v. side to obtain full-load current of 200 A in the l.v. winding on short circuit (ii) the power factor on short circuit.
- (Q1f, Draw and compare the per-phase electrical equivalent circuits of a transformer and of an induction motor. Using simple magnetic circuits, explain how the values of the magnetising (shunt) impedances compare in the two devices and what is the cause of the difference between the two? Figure 2. A transformer and an induction motor. Among other differences, one is typically rectangular, and the other one is round :DAn ideal transformer circuit is shown in Figure Q4(a). Its primary and secondary turns are 400 and 200 respectively. (1) Calculate the rms primary current. (ii) Calculate the rms flux in the transformer core. (iii) State two losses that contribute to transformer active power loss that have been ignored in this ideal model. N, Ny 30 + j30 2 300 sin50t Figure Q4(a) 000000001. A transformer takes 10 A on no-load at a power factor of 0.1. The turn ratio is 4 : 1 (step down). Ifaload is supplied by the secondary at 200 A and p.f. of 0.8, find the primary current and power factor(internal voltage drops in transformer are to be ignored).
- Hi , This is nota graded question. This is from a textbook. Thanks for providing the answersSolvagging) 18. An ideal 50-Hz, core-type transformer has 100 primary-turns and 200 secondary- turns. The primary rated voltage is 220 V. If the maximum permissible flux density is 1.2 T, what should be the cross-sectional area ? Also, find (a) the secondary voltage, and (b) the primary current in complex form with reference to the secondary voltage vector when secondary delivers a current of 8 A at a lagging power factor of 0.8.