A.1. A gas likely to be used in an inert-gas system of a power transformer is A. oxygen. B. hydrogen. C. air. D. nitrogen.
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A: “Since you have asked multiple questions, we will solve the first question for you. If you want any…
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A: The explanation is as follows.
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A: The solution is given below
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Q: 2- Why the transformer core made from lamination plates?
A: We are authorized to answer the first question since the exact one wasn’t specified. Please submit a…
Q: single-phase 50-kVA, 2400/240-volt, 60-Hz distribution transformer is used as a step-down…
A:
A.1. A gas likely to be used in an inert-gas system of a power transformer is
A. oxygen.
B. hydrogen.
C. air.
D. nitrogen.
A.2. In the design of transformer windings, creepage between conductors and core yokes is prevented by
providing,
A. keep-back distance.
B. vertical oil ducts.
C. separation sticks.
D. bushing terminals.
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- 12.a. Comparing the transformer cores of core-form and shell-form transformers shows that thea. shell form provides lower reactance without increasing the transformer size.b. core form makes possible wider coils and better oil circulation.c. shell form is used exclusively in small low-voltage transformers.12.b. Distribution transformers are generally protected from damage due to excessive internal temperatures,by the operation of aA. lightning arrester.B. circuit breaker.C. surge diverter.1-Why the transformer core made from lamination plates? 2- Why core losses remain almost constant at any load? 3- Why O.C.T. is generally performed on L.V. side (not at H.V. side)?The core of a three phase, 50 Hz, 11000/550 V delta/star, 300 kVA, core-type transformer operates with a flux of 0.05 Wb. Find (i) number of H.V. and L.V. turns per phase. (ii) e.m.f. per turn (iii) full load H.V. and L.V. phase-currents.
- 1.a. For performing dielectric-strength tests on insulating materials, two transformers are connected in aA. parallel combination.B. cascade arrangement.C. polyphase arrangement. 1.b. In large power transformers, the unequal voltage distribution caused by voltage surges in the winding isprevented by the use ofA. static shields.B. series capacitors.c. low-voltage arresters.1 Choose which of the following current is in phase with the flux in the no load phasor diagram of practical transformer a. Core loss component b. Magnetizing component c. Hysteresis current component d. Eddy current component1) Identify, which component of no load current supplies hysteresis loss, in a practical transformer? a. None of these b. IM c. IC d. I0
- 9. The no-load current of a single-phase transformer is 5.0 A at 0.3 power factor when supplied from a 240-V, 50-Hz source. The number of turns on the primary is 200. Calculate (a) the maximum value of the flux in the core, (b) the core losses, and (c) the magnetizing current.b- What is the main differences in the design of Pulse transformer and Isolating transformer. c- Explain the main factors have to be considered in the design of distribution transformer. d- Which type of core materials is more suitable to avoid the Inrush current in power transformers. Explain the reason. e- Why it is very dangerous to let the current transformer used as a measuring device in a high voltage power system to be open circuited?9. A single-phase transformer has a turn ratio of 6, the resistances of the primary and secondary windings are 0.9 £2 and 0.025 2 respectively and the leakage reactances of these windings are 5.4 92 and 0.15 2 respectively. Determine the voltage to be applied to the low- voltage winding to obtain a current of 100 A in the short-circuited high voltage winding. Ignore the magnetising current.
- When the transformer is supplied at 400 V, 50-hz the hysteresis loss is found to be 300 W and eddy current loss is found to be 250 W. Determine the hysteresis loss when the transformer is supplied at 800 V, 100-hz.4. When supplied at 230 V, 50 Hz, a transformer's no-load current is 5.0 A at 0.3 power factor. The primary winding has a total of 200 tums. Calculate the (i) maximum value of flux in the core, (ii) core loss, and (ii) magnetizing current.The high-voltage side of a transformer has 750turns, and the low-voltage side has 50 turns. When thehigh side is connected to a rated voltage of 120 V,60 Hz, a rated load of 40 A is connected to the lowside. Calculatea. The turns ratio.b. The secondary voltage (assuming no internaltransformer impedance voltage drops).c. The resistance of the load.