To construct Step-up transformer Physical quantity Measured value Secondary coil turns Primary coil turns Load Resistance

Q: Draw approximate transformer model into all quantities of a secondary referred to primary

A: Transformer: A Transformer is a static a.c device used either for raising or lowering the voltage of…

Q: Whether a transformer shifts an ac waveform by 0° or 180° depends on the phasing of the waveform…

A: Shifts of ac waveform by 0 to 180 degree is depending on

Q: The percentage regulation of an ideal transformer is: O Zero O 50 O 100 O 10

A: In the secondary winding of the ideal transformer, there will be no voltage drop as there is no…

Q: In step down transformer, secondary turns are less than primary turns. Select one: O True O False

A:

Q: A Step-down transformer is given and calculate 5:1 120 V 60 Hz V2 1 k? i. Peak load and D.C. load…

A: Since it is a step down transformer therefore V2<V1 and number of turns in primary will be…

Q: With a turns ratio of 12 to 1 and an input voltage of 240V and output 12V, propose a system of…

A: The solution is given below

Q: A transformer has a rated output of 300 kVA at a power factor of 1.2. Determine the rated power…

A: Please comment if you need any clarification. If you find my answer useful please put thumbs up.…

Q: Problem: For the given circuit as shown in figure a) Find the equivalent reactance b) Draw the…

A: Solution !!

Q: transformer is called single winding transformer. O Three phase O Auto O 1:1 O Isolation

A: Correct option is auto transformer that is 2nd option is correct

Q: A 400/200 V, single-phase transformer has primary winding resistance of 0.20 and secondary winding…

A: Given a 400/200 V, single phase transformer has, Primary winding resistance, R1=0.2 Ω. Secondary…

Q: If the turn ratio of a step-up transformer is 1:15 and the full-load secondary current is 300 A, the…

A:

Q: During short-circuit test, iron losses are negligible because the voltage applied on primary side is…

A: let us arrive at the right answers in each case by analyzing the given statement as shown below.

Q: I will upvote for correct answer A transformer has a rated output of 300 kVA at a power factor of…

A:

Q: What would happen if primary and secondary of transformer are connected to sources of different…

A: Transformer is used to transfer electrical energy from primary winding to secondary winding.…

Q: Which of the following voltage (V), current (1), ar turns (N) characteristics apply for a step-up…

A: In this question we will define step up transformer....

Q: A single-phase 800 V/100 V, 50 H transformer has a core maximum density of 1.8 Wb/m² and an effe…

A:

Q: In your own understanding what do you understand by step down transformer

A: Electrical machines can be either generator or motors. They can be either Ac machines or DC…

Q: Volt ac voltage is applied to the primary input of a transformer. A load of B ohms at the output it…

A:

Q: The step up transformer has transformation ratio less than 1 Select one: O True False

A: The transformation ratio is defined as the ratio of secondary voltage to primary voltage. It is…

Q: To prevent the harmful voltage induction by the series winding, the transformer primary must before…

A: To prevent the harmful voltage induction by the series winding, the transformer primary side must…

Q: What type of transformer did you build where the secondary voltage is lower than the rimary voltage?…

A:

Q: In no load Phasor diagram of practical transformer, the core loss current Ic is with primary voltage…

A: When a transformer is on no-load, the secondary is open circuited. Hence secondary current is zero.…

Q: The table below shows some performance parameters of a certain power transformer. Full-load voltage…

A: In this question,  Choose the correct options What is power factor to become zero voltage…

Q: The table below shows some performance parameters of a certain power transformer. Full-load voltage…

A:

Q: In no load Phasor diagram of practical transformer, the iron loss current lc is with flux 0. O In…

A: In the question,  Fill the given blank from the given option.    In the load phasor diagram of…

Q: Ideal transformer core has permeability equal to Select one a Non-zero finite c. Negative G Intinite

A: Ideal transformer core has permeability equal to

Q: The table below shows some performance parameters of a certain power transformer. Full-load voltage…

A: The voltage regulator is required to maintain voltages within the permitted range that the…

Q: With the aid of simple sketches explain briefly the meaning of transformer polarity and terminal…

A: Given: Explain briefly the meaning of transformer polarity and terminal marking.

Q: The magnetizing equivalent circuit of transformer can be found by open circuit test O True O False

A: Given: Transformer: Transformer is a static device used for the transfer of voltage and current from…

Q: The purpose of the no-load test in the transformer is to determine O Input voltage O Core loss…

A:

Q: Which of the following quantities is increase in a step-down transformer? O Current O Voltage O…

A: As per the definition, the transformer is a device that can convert one voltage level to another…

Q: A transformer has a rated output of 400 kVA at a power factor of 0.6. Determine the rated power…

A: Rated output (S) = 300 kVA Power factor (ϕ) = 0.6 We have to find the rated power output and the…

Q: The main difference between the step-up and step-down transformer is?

A: Transformer It is a device that either raises or lowers the voltage as it distributes electrical…

Q: Calculate the primary leakage reactance of a transformer, supplying a load current of 10 A and 60…

A: Inductance = No. of turns×FluxCurrent Leakage inductance in primary = No. of primary turns×rms value…

Q: The no-load current in the transformer lags behind the applied voltage by phase angle about *

A: The current lags the no load voltage with phase angle about 75o.

Power Measurement

According to Blondel's theorem, the total power is measured with one less number of wattmeters than the number of wires present in the system. So, a single-phase and two-wire system will require one wattmeter and a single-phase and the three-wire system will require two wattmeters, and a three-phase and the three-wire system will also require two wattmeters and a three-phase and the four-wire system will require three wattmeter devices. The wattmeter is a device that measures power using one voltage and one current input as shown in the above figure. Multiple current or voltage input pair cables are used by many power analyzers and digital storage oscilloscopes (DSOs) for measuring watts, in effect within a single instrument acting as multiple wattmeters. It is possible to measure three-phase and four-wire power with one correctly specified power analyzer.