18.a. An inductor whose reactance can be varied by supplying current through a separate DC winding is called a/an A. saturable reactor. B. reactance tube. C. current reactor. D. autotransformer. 18.b. A typical value of a-c voltage provided by a transformer for the operation of a doorbell is A. 2 V. B. 24 V . C. 80 V. D. 120 V.

Q: 1. If a 0.6 accuracy class current transformer has a phase angle of + 10 at 100% rated current, the…

A: Ans.(1). Value of 'β=10'

Q: AC input= 120V rms. Transformer Ratio = 15:1. Reference Voltage = 6.3V. Rload = 56 Ohms. Ambient…

A: The circuit is given as The peak voltage at the primary side of transformer isVmp=2×120Vmp=169.7V

Q: 3. An 100-kVA, 2500/125-V, 50-Hz, step-down transformer has the following parameters: R₁ = 1.50, X₁…

A: Given that ,Rated output  k VA.Induced EMF ratio  Volts.Turns ratio is   .Supply frequency  Hz.R1 =…

Q: What is the relationship between the power losses and the load current of a power transformer?…

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Q: (b) Explain why a power transformer is ideally designed so that the flux density in the magnetic…

A: The answer is provided in the following steps.   It is best with my knowledge, please refer all the…

Q: Draw and explain the efficiency characteristics of transformer and regulation characteristics of…

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Q: The circuit for a 20-KVA, 220/3960 V, 50-Hz transformer is shown in Figure (1). The open- circuit…

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Q: Write the specification of transformer and voltage regulator

A: Transformer: At constant frequency, The device that converts electrical energy from one ac circuit…

Q: Flag this question for future reference What is the test that can be conducted in the laboratory to…

A: In this question we have to determine in which test transformer impedance drops are dependent on…

Q: purpose of brushes in a dc machine is__________. to change ac to dc signal to remove the losses in…

A: brushes in DC machine is placed between rorating commutator and external circuit. We will consider…

Q: ← Introduction to Control... The maximum a transformer temperature rise of is 50°C. It attains a…

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Q: i) (a) What is use of Lissajous Figures in CRO? (b) Mention the use of Instrument Transformer in…

A: Dear student you asked multiple question in single request.we have limited time so that we solve…

Q: describe the application of transformer oil in power system equipments.

A: Transformer: Transformer is an electric device. It is also known as static device as it doesn't have…

Q: transformer

A: If we are giving dc to the transformer it won't work . transformer works on the principle of electro…

Q: An 100-kVA, 2500/125-V, 50-Hz, step-down transformer has the following parameters: R₁ = 1.50, X₁ =…

A: Given information is,Rated output  k VA.Induced EMF ratio  Volts.Turns ratio is   .Supply frequency…

Q: 1) What is the need of compensation in power system?

A: We are authorized to answer one question at a time, since you have not mentioned which question you…

Q: 3. Why the copper loss in the primary can be neglected, in the open circuit test?

A: “Since you have asked multiple question, we will solve the first question for you. If you want any…

Q: 1. A transformer transforms. (a) frequency (b) voltage (c) current (d) voltage and current. 2. Which…

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Q: 20. When a current transformer is used with an SCR-controlled resistance load, which one of the…

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Q: i. Draw the block diagram of CRO with indication of each part

A: Note: We are authorized to answer the first question since the exact one wasn’t specified. Please…

Q: a buck converter, what are the benefits and disadvantages if the changes of duty cycle is drastic…

A: Duty cycle : Duty cycle in the power system is defined as the ratio of the time during which a load…

Q: PRINCIPLE OF OPERATION OF A SINGLE-PHASE IRON CORE TRANSFORMER.

A: Given: PRINCIPLE OF OPERATION OF A SINGLE-PHASE IRON CORE TRANSFORMER. According to question:…

Q: Define Mutual Induction and how describe how a transformer operates.

A: Here is the explanation

Q: If a voltage source is applied to the primary while

A: The circuit diagram of a transformer and its equivalent circuit resolving the Inductors can be drawn…

Q: Find the elements of the equivalent circuit relative to the secondary of a single-phase transformer.…

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Q: answer quickly

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Q: Q-3 A Cockcroft-Walton type voltage multiplier has ten stages with capacitances, all equal to 0.1…

A: For the given  C= 0.1 uF  V = 100kV  f = 60Hz I =5 mA n =10

Q: Core losses of a single phase 400/240 V, 20 kVA, 50 Hz transformer is 700 W. Maximum efficiency of…

A: Given, Core losses of a single phase 400/240 V, 20 kVA, 50 Hz transformer is 700 W. (Pi=0.7 kW)…

Q: Q1. Describe the following related to Current Transformer (CT): Draw the equivalent circuit diagram…

A: Equivalent circuit diagram of CT in which, n=turns ratiors=resistance of 2° windingxs=reactance of…

Q: difference between induction motor and transformer

A: Given: Difference between induction motor and transformer.

Q: Explain transient analysis of transformer

A: Transient Analysis in Transformer: -> Sudden variations in electrical quantities under the…

Q: 20.a. If the unloaded secondary voltage of a transformer is 210 V and the full-load secondary…

A: Given transformer no load voltage VNL=210 V Transformer full load voltage =VFL =200 V

Q: answer

A: According to question: A) The no-load current of a transformer changes when voltage greater than the…

Q: AC power of 100 volts and 1 ampere enters a transformer with 2 coils and exits the transformer with…

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Q: Short discuss about transformer cooling...

A: Transformer:- A device that moves electric energy from one alternating-current circuit to one other…