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.
Q: 24. A transformer has a core loss of 160 watts when its primary is connected to a 230- volt 60-cycle…
A: A transformer is an electrical machine which is used in AC circuit to either step up or step down…
Q: What is the characteristic of transformer of step-up and step-down transformer?
A: We are supposed to be answer of first question as per guildlines.
Q: (b) Discuss about the tap changing transformer and synchronous condenser methods of voltage control…
A:
Q: A three phase Y/A transformer rated at 50 MVA, 230/34.5 kV is to be protected using biased…
A:
Q: Where do an Iron loss occur? 17. What type of material is used for transformer core to reduce…
A: In this question we will write about iron loss and hysteresis loss and losses varies with load...…
Q: (a) A 220 / 400V, 13KVA, 50Hz single phase transformer has at full load, a copper load of 140W. If…
A:
Q: With neat diagram explain the principle of operation of Induction type energy meter. ?
A: The construction of the single phase energy meter is shown in the figure below.
Q: A transformer has two 2,400-volt primary coils and two 240-volt secondary coils. Indicate by…
A: An electrical device may be a static device that transfers electricity or power from one circuit to…
Q: A 200 – MVA, 15/200 kV single-phase power transformer has a per – unit resistance of 1.2 percent…
A:
Q: Problem-13 A50-kVA, 13,800/208-V, 4-Y distribution transformer has a resistance of 1 percent and a…
A:
Q: Differentiate an ideal transformer and a practical transformer. Explain the ideal and practical…
A: Before differentiate between ideal and practical transformer let us understand the basics of simple…
Q: ou are employed in transformer fabrication unit. You have to design core of transformer. With regard…
A: Transformer: Transformer is an electrical static device works on the principle of electromagnetic…
Q: what are the advantages and disadvantages of single phase dry-type power transformer when used with…
A: Single-phase dry-type power transformer: Dry-type transformer never uses insulating liquid (which is…
Q: What is instrument transformer? Also discuss the types of instrument transformer?
A: Instrument transformer For a measurement of AC electrical quantities of the system transformers are…
Q: A transformer takes a current of 0.56 A when its primary is connected to a 245 volt, 50 Hz supply,…
A: Given No load current of the transformer I0=0.56 APrimary voltage V1=245 vfrequency f=50 HzPower…
Q: A single-phase 100-kVA, 2400/240-volt, 60-Hz distribution transformer is used as a step-down…
A: We are authorized to answer three subparts at a time, since you have not mentioned which part you…
Q: What is a transformer and explain how does it works
A: “Since you have asked multiple questions, we will solve the first question for you. If you want any…
Q: During short-circuit test of a transformer, the core loss of a transformer is negligible. Select…
A: In this answer we will discuss whether the core loss of a transformer is less / not when conducting…
Q: 1- The transformer called step-up transformer, when the number of greater than winding winding. 2-…
A: As per the guidelines, we supposed to answer the first three-part of the question at a time so…
Q: A 120-VA 130/13 V transformer is to be connected so as to form a step-up auto- transformer. The…
A: Given two winding transformer with 120 VA 130/13 v Series resistance and reactance is 1% and 8 % per…
Q: 1-which side is short cct.in short cct. test ? why? 2- Draw the exact equivalent circuit of the…
A: Answer(1) A short circuit test is conducted to find out variable losses in the transformer. So, to…
Q: 3.4 A single-phase 100-kVA, 2400/240-volt, 60-Hz distribution transformer is used as a step-down…
A: As per guidelines given to us we can only provide the solution of one question in multiple type of…
Q: 2-37/13* A 50-kVA, 2300-230-V, 60-Hz transformer supplies a 0.8 lagging power- factor load whose kVA…
A: Solution Given, cos θ = 0.8 core loss= 0.42…
Q: 4-If the transformer is loaded by purely capacitive load, what is the expected regulation and…
A: if the transformer is loaded by purely capacitive load what is the expected regulation and…
Q: Fill in the blanks The short circuit test of a transformer gives information of _______?
A: The short circuit test of a transformer gives information of full load copper losses. In short…
Q: The information shown in the table below was obtained when a 60-VA, 120/208 V, 60 Hz transformer was…
A: Given, Power Rating = 60 VA Voltage ratings of the transformer 120/208 V Core loss components from…
Q: A lø transformer has an equivalent leakage reactance of 0.04 per unit. The full-load copper loss is…
A:
Q: Assume that a 250-kVA distribution transformer is used for single-phase pole mounting. The…
A: Given Data: V1 = 7200 V V2 = 2520 V Zpu = 0.035 pu S = 250 kVA current in HV winding Ihv = 0.7…
Q: 5-Questions : 1- What are the advantages of Transformer Tests?
A: We’ll answer the first question since the exact one wasn’t specified. Please submit a new question…
Q: 1- The transformer called step-up transformer, when the number of winding. winding greater than 2-…
A: As per the guidelines, we supposed to answer first three part of the question at a time so please…
Q: Power transformer divided into two categories which are dry type and oil-immersed transformer, with…
A: You have asked multiple independent questions. We are authorized to answer one question at a time.…
Q: What does stepping up and stepping down mean and how does it pertain to a transformer?
A:
Q: Example 1: A single-phase, 100-kVA, 1000:100-V, 60-Hz transformer has the following test results:…
A:
Q: A typical single-phase transformer has a certain value of voltage regulation when connected to the…
A: The problem is related to voltage regulation of transformer. The voltage regulation is positive for…
Q: During the load test of single-phase transformer, when the secondary terminal voltage increases, the…
A:
Q: Answer all questions Q1/ Answer the following: 1- Can a Single-Phase Transformer be used on a…
A: Single-phase transformer : A single-section transformer is an electrical tool that accepts…
Q: A transformer has two 2, 400-volt primary coils and two 240-volt secondary coils. Indicate by…
A:
Q: What is the Influence of the manner the core coil assembly of the transformer on calculations of…
A:
Q: A single-phase, 10-kVA, 480/120-V transformer is to be used as an autotransformer tying a 600-V…
A: The base impedance referred to the primary side is determined as: Zb=(480 V)210 KvA=23.04 ohmFor…
Q: A transformer rated 300 kva with the high-voltage winding designed for 2300 volts will most probably…
A: The explanation is as follows.
Q: Per-Unit System 3) If a 250MUA,11/400 KU, Three-Phase power Transformer has Zpu of 0.05 pu on the…
A:
Q: A 50-kVA 13.8-kV/208-V (rms, line-line) ∆ − Y three-phase distribution transformer has a per unit…
A: Given,High voltage side, line voltage(Base) =13.8 kVApparent power (S)(Base)=50 kVAa) As primary is…
Q: 1- What are the advantages of Transformer Tests? 2- Why is the high voltage winding of single phase…
A: advantages of transformer tests why is high voltage winding of single phase transformer is kept open…
Q: 2.20 The nameplate on a 25-MVA, 60-Hz single-phase transformer indicates that it has a voltage…
A: NOTE: Since you have asked multiple question, we will solve the first question for you. If you want…
Q: A single-phase, 250-kVA, 11-kV/415-V, 50-Hz transformer has 80 turns on the secondary. Calculate (a)…
A: The solution is given below
Q: (b) A 40-kVA, 2600/1300-V, single-phase transformer has a core loss of 620 W. The transformer has a…
A: The solution is given below
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.
Trending now
This is a popular solution!
Step by step
Solved in 3 steps
- 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)?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.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.