J_Q-7

Sap ID=8925

(a)Using the current sheet concept derive the peak value of mmf of a machine in terms of uniform current density and spread of uniform current sheet.

q6/   Complete the blank In AC-DC power transmission system, ............................................. is used to convert the DC supply into AC supply.

(5) Primary AC Source Transformer Secondary AC/DC Full-wave Rectifier Capaictor in Non- linear Load Figure 6 Analyse different methods of harmonics mitigation to eliminate the harmonic, which you have identify in above power system circuit. You can use harmonic filters, K or equivalent transformers or oversized neutral method depending upon the harmonic sources.

What is transient stability in power system?

Question 2. Considering this figure. The firing angle is 45°, the motor current is 10 A, and the supply voltage is 110 v. 0₁ 0₂ 90 (a) Draw the waveforms of v, Vo. io. isi, iDi, and i. (b) Determine the power taken by the dc motor. (c) Determine the supply volt-amperes and supply power factor. Assume that the converter is lossless. (d) Determine the rms value of the SCR current and the diode current.

a) Demonstrate input and output waveform of single phase Cyclo-converter such that output frequency is 1/3 of input supply frequency with circuit diagram. b) Perform the calculation to analyze (i) output RMS voltage and (ii) input power factor of single-phase AC voltage controller as shown in the following figure. Suppose converter has a resistive load of R=‘A’ Ohm and the input voltage is Vs=220, 50Hz with a delay angle of π/3. A= 4

Q1. Describe the following related to Current Transformer (CT): (i) Draw the equivalent circuit diagram of CT and develop the corresponding phasor diagram. Draw the transient response of CT and describe the transient errors in a CT. [5] [5] (ii)

Solve it clearly please with more information

2 Compare between base load pbiney stvion and peak load power station.

Could you explain how these factors cause the degradation?

I need the answer as soon as possible

Explain the concept of power quality in electrical systems and the potential issues that can arise, such as voltage sags, harmonics, and flicker.

Explain hybrid operation of solar PV system

22. The voltage applied to the h.v. side of a trans- former during short-circuit test is 2% of its rated of voltage. The core loss will be........percent the rated core loss. (a) 4 (b) 0.4 (c) 0.25 (d) 0.04

I need answer more than 350 word and dont write in the paper plz.

For type-A chopper of. de source voltage = 230 V, load resistance = 102. Take a voltage drop of 2 V across chopper when it is on, For a duty cycle of 0.4, calculate (a) average and rms values of output voltage and

help me in these questions pls write the questions with the and by (Computer) 1-Which of the following statements INCORRECTLY explain the label in the figure about LVDT working principles? a. Secondary coils are connected in series in such a way that their output is opposing each other. b. Constant DC voltage input to primary coil. c. Displacement moves ferrous rod from central position. d. The difference of the output voltage between the two secondary voltage.==========2- Explain the working principle of the measurement system in the figure below.i. Force input that is supplied to the sensor is processed to give the response in the form of raw output signal.ii. Signal conditioner manipulated the weak signal to give a conditioned input.iii. Analog or digital indicator display the unit that gives output reading of quantity being measured.iv. Measured value is compared with the input value for further action. a. ii, iii and iv only. b. i, ii and iv only. c. i, ii and…

Q2) single-phase bridge-type cycloconverter has input voltage of 230V and 50Hz and load of R=102. Output frequency is one-third of input frequency. For a firing angle delay of 30°, (a) Draw the circuit, (b) Calculate RMS value of output voltage (c) Calculate RMS current of each converter (d) input power factor.

Describe the purpose of voltage regulation in power distribution systems.

Question 1 A 125 MVA, 20 kV, three-phase, wye-connected, 60 Hz, synchronous alternator is connected to a 20 kV power grid. The alternator has negligible armature resistance and synchronous reactance of 5 2/phase. The mechanical limit of the turbine powering the alternator limits its maximum power output to 100MW. (a) Calculate the value of excitation voltage (line to neutral with angle) needed for 50% maximum power (50MW) at unity pf. |E(LN) 8 (b) Find the alternator reactive power import/export if its real power output is now increased to 75% rated (75 MW) with the excitation unchanged. (1) Draw before and after phasor diagrams on the same axes (performance chart) to illustrate the two operational states. (ii) Calculate the alternator reactive power import/export when its real power output is increased to 75% rated (75 MW) with the excitation unchanged. Q3ph Import or export?

for solar PV while module heat up ! Voc is unstable ( increase and decrease ) why this happen ?   Isc is increase or decrease and Why ? ..

Q- Select the correct answer: a- The high concentration of holes and electrons in the central junction of a thyristor decreases by the process of ................ during off transient period with a time tar. 1- Forced commutation, 2- Phase commutation, 3- Load commutation, 4- Reverse bias commutation, 5- None of previous. Power Electronics b- The non-trigger voltage of a thyristor is.............. 1- VBO, 2- VBn, 3- VGn, 4- VGD, 5- None of previous. is the limiting positive anode voltage above which thyristor may be damage. 1- PRV, 2- PFV, 3- PAV, 4- PAK, 5- None of previous. C- d- The ripple frequency in the output voltage of single-phase half-controlled bridge AC/DC converter is when a > 60°. 1- 3f, 2-6f, 3- 2f, 4- f, 5- None of previous. ********* e- The integrator in the firing circuit of 1-phase bridge AC/DC converter is necessary to have firing angle range. 1-0-90°, 2-0-120°, 3-0-180°, 4-0-360°, 5- None of previous. f The harmonic contents in an inverter can be reduced through…

I need answer more than 350 word and dont write in the paper plz.

A 1200 kW,60 Hz synchronous alternator A identical governor droop of 0.0005 Hz/kW.Machine A takes two third of 1000kW bus load at 60 Hz.lf an additional 800 kW load is connected to the bus determine (a) bus frequency (b) load on each machine. is in parallel with a 400 kW,60 Hz alternator B.Both machines have (a) 58.6 Hz (b) 566.67 kW, 433.33 kW. (a) 59.6 Hz (b) 866.67 kW, 133.33 kW (a) 59.8 Hz (b) 666.67 kW, 333.33 kW (a) 58.9 Hz (b) 766.67 kW, 233.33 kW

A single phase full wave AC voltage controller has a resistive load of 5 ohms and an input voltage of Vs = 240 V (RMS), 50 Hz. The delay angles of both thyristors are set to 45 degrees. The maximum RMS and average current ratings of the thyristor are equal to: Select one: O a. 33.94A and 21.6A O b. None of these O c. 24A and 10.8A O d. 48A and 26.09A Clear my choice

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The rating of current transformer is given as 200/5A 5P10 20VA. Assume that the secondary resistance of the CT is 0.12 O. Calculate the following values when the accuracy limit factor is 24. (i) New accuracy current limit, (ii) New secondary impedance, (iii) New burden in VA

CHOOSE THE CORRECT ANSWER  5. ** Increases the output voltage without transformer. ** Single mosfet structure is more efficient. ** The input current is continuous. Which option is correct for the above mentioned DC-DC converter? a) Buck DC-DC Converter b) O Buck-Boost DC-DC Converter c) O Boost DC-DC Converter d) None

Thyristor-Switched Series Capacitor (TSSC) for power factor improvement.

Explain about (ZCS) zero current switching and (ZVS) zero voltage switching in steady state transient condition: a) Switching current and voltage of the switch b) output current and voltage at the load

Please explain in detail

6. In relation to a compound d.c machine, choose the right statement from the following    (A) Both series and shunt field coils have comparable and number of turns and cross sectional          areas.    (B) Shunt field coil has fewer number of turns and large cross sectional area compared to series          field coil.    (C) Series field coil has fewer number of turns and large cross sectional area compared to shunt          field coil.     (D) None of (A), (B) and (C) are correct statement.