The expression for mean torque of an instrument may be written as, T = KMªEÞZ° Where M=mutual inductance between fixed and moving coils E= applied voltage, K, constant Z= impedance of load circuit Determine the values of a, b and c performing the dimensional analysis.
Q: Which of the following is used to reduce the compounding of a DC generator? Inverter Diverter…
A: DC generator is a device which converts the Mechanical energy into the electrical energy
Q: A long shunt generator delivers 25kW at 220V. The shunt, series and armature resistances are 500,…
A:
Q: A 4pole lap wound armature when driven at 600rpm generates 120V. if the flux per pole I 25mWb, find…
A: A d.c. generator is an electrical machine in which mechanical energy gets converted into electrical…
Q: 1- Please, Derive Equation of Motion for the 2DOF system with Harmonic force due to the Shaker in…
A: From the given figure, By applying the mechanical modelling method for the translational system,…
Q: A Wind Generator with the following data is installed at a wind site. Upward wind velocity: 6.5 m/s…
A: upward wind velocity-6.5m/s downward wind velocity-2.5m/s length of blade=1500cm efficiency of gear…
Q: Derive the equation (Rule) step by step, to calculate the secondary induced emf of a static…
A: Consider the static electric machine is the transformer. Then, the emf equation of the transformer…
Q: A 3-phase, Y=-connected, 440 V, 20-kW, 50 Hz, 1450 rpm wound roto induction machine has the…
A:
Q: A long shunt generator delivers 25kW at 220V. The shunt, series and armature resistances are 50Ω,…
A:
Q: For a two finite machines, inertia constant combines like the impedance connected in series. Select…
A: For two finite machines, inertia constant (H)
Q: Example 2: The stator of a 30 , 8-poles machine has 96 stator slots and short-pitched by 9/12. The…
A: To findVLVph Fundamental Voltage = V3rd Voltage = 0.30V5th Voltage = 0.15V
Q: Power system 1 has 4 identical generator, each rated 80MVA and inertia constant for each H=7MJ/MVA,…
A: Since, any other information is not provided in the system then considering it as the coherent…
Q: The parameters of the exact equivalent circuit for a three-pha connected, 400-V, 10-hp, 50-Hz,…
A: As per Bartleby guidelines we are allowed to solve only three subparts, please ask the rest again.…
Q: 14 Open- and short-circuit test has been performed of a synchronous machine 45-kVA, three- phase,…
A: Unsaturated synchronous reactance is calculated using Vph on airgap line and armature current at…
Q: A 4-pole, wave connected winding dc shunt generator has core diameter of 0.7 m, 520 conductor, the…
A: Given, the Shunt generator is wave connected Poles (p)=4 Number of conductors = 520 Speed = 720 Rpm…
Q: In a DC machine, _provides the magnetic path as well as the mechanical support to the whole machine.…
A: we will consider function of each option to answer the given question .
Q: Q2 The expression for mean torque of an instrument may be written as, T = KM Ebzc Where M=mutual…
A:
Q: An 8-pole d.c. shunt generator with 778 wave-connexted arınature conductors running at 500r.p.m.…
A:
Q: What if the forces T, and T, both reverse direction, and with new magnitudes T, = 3.7 N and T = 12.6…
A: Here T1, T2 are given and radius are given apply net torque formula
Q: The torque angle of synchronous machine operating from a constant voltage bus, is usually defined as…
A: the torque angle of synchronous machine is operated from a constant voltage bus, is usually defined…
Q: Analyze the following indeterminate trusses using the Force Method. Assume a constant EA
A:
Q: ne function of a commutator is O change dc to ac O cuts the magnetic flux and emf is induced O…
A:
Q: Starting with the initial values (1, 1, 1), solve the following system of equations by the…
A: Given the system of equations x12-x22+x32=11x1x2+x22-3x3=3x1-x1x3+x2x3=6
Q: Explain vector grouping of transformers with suitable diagrams. Mention its usefulness.
A: The three-phase transformer can be imagined as a three single-phase transformer having a common…
Q: A shunt generator supplies a 25kW load at 235V through cables of resistance, R = 116mn. If the field…
A:
Q: 6. For a series dc generator with Rs =12, R, = 3 2, and V, = 60 V that delivers 240 W to the load,…
A: Note :- as per guidelines only the first question can be solved, kindly re post the other questions…
Q: Determine the flux per pole for 6 pole dc machine having 240 wave connected conductors, which…
A:
Q: The suitable turbine types used for a depends on many influencing parameters, with two primary…
A: The answer is hydropower plant
Q: Example( 1.8): The following is the magnetic (c/s) of a D.C. generator driven at 1000 r.p.m. If (A)…
A: It is given that:
Q: Explain the power flow diagram of a de generator. Q1/
A:
Q: A 4-pole, simplex lap wound armature when driven at 600 rpm generates 120 V. If the flux per pole is…
A: In this question we need to find a number of armature conductor.
Q: For a transformer oil system, if the insulation through which oil flows has a lower thickness,…
A: Transformer oil (otherwise called protecting oil) is an uncommon kind of oil which has magnificent…
Q: The torque angle of synchronous machine operating from a constant voltage bus, is usually defined as…
A: The torque angle of synchronous machine operating from a constant voltage bus, is usually defined as…
Q: TUTORIAL PROBLEMS LA4gele shunt gmerstor widh wave-wound armature has 41 alots,, ech having 12…
A: As per guidelines we are supposed to solve only first question if multiple questions are asked by…
Q: Using Faraday's Law as a starting point prove that the maximum operating voltage of a transformer to…
A:
Q: Open- and short-circuit test has been performed of a synchronous machine 45-kVA, three- phase,…
A: It is given that: V=220 Vf=50 HzKVA=45P=6 OC characterstics:VLL=220 V,If=2.84ASC…
Q: 5- Calculate the reactance voltage for a machine which runs at 900rpm number of commutator segments…
A: For the given data Speed of the machine = 900 rpm Number of segments = 65 Brush width = 1.74 cm…
Q: For a transformer oil system, if the insulation through which oil flows has a higher thickness,…
A: Transformer oil is an uncommon kind of oil which has magnificent electrical protecting properties…
Q: Explain briefly the advantages and disadvantages of tractor.
A: The advantages of tractor are as folloes Quick or fast work completion time ‐ since the tractor is…
Q: E = K,ONvolts-where NIS Example 8.8. Afour-pole generator, having wa ve-wound armature winding has…
A: The solution is given below
Q: A long shunt generator delivers 25kW at 220V. The shunt, series and armature resistances are 50ohms,…
A:
Q: a. Sketch the magnetization-temperature graph of a material. b. A mass of 1000Okg transformer is…
A: a) material type is not mentioned in the question. We have drawn plot for Paramagnetic,…
Q: A 304 ball bearing carries a radial load of 500 lb and an axlal load of 125 lb at 300 rpm for 50% of…
A:
Q: Choose correct answer The bearings and commutator rotation of the DC machines which causes the A)…
A: Option B is correct. The explanation is provided below.
Q: Most generators operate at constant speed and the output terminal voltage is adjusted by varying the…
A: To complete the statement about Separately excited DC generator using the words from the given word…
Q: can we apply the principle of electromagnetic induction in a Transformers operation? (short answer)
A: Electromagnetic induction : According to electromagnetic induction whenever there is a change in…
Q: Components of mechanical translational system are damper, torsional spring and mass Select one:…
A:
Q: Discuss about generator modeling and drive the formula for the real and reactive power supply it .
A: Generator modeling - The simplest sophisticated modeling in a system stability tool are generator…
Step by step
Solved in 2 steps with 2 images
- 12- If Cu loss of a transformer at 7/8th full load is 4900 W, then its full- load Cu loss would be..watt. a- 5600 b- 6400 c-375 d-429 Q4) A.)Correct the wrong sentences if you find it in only four(4) of the following sentences: a) The magnetic field intensity is a vector quantity, perpendicular to the direction of field density vector. b) The eddy currents always tend to flow perpendicular to the flux. c) The arcas of the hysteresis loop is a measure of heat energy lost per cycle, so that choosing the hard magnetic material is better. d) In the short and open circuit test the core loss can be measured on either side of the transformer but the copper loss measured in the low voltage side. e) A transformer of voltage regulation (2.67%) is better than a transformer of (1.53%) and the regulation of ideal transformer is unity. B)Draw the single phase transformer equivalent circuit and the phasor diagram of the voltage drops in simplified primary terms parameters transferred to secondary…QUESTIUNDH 1. Why is it not adjustable to carry or the same experiment for large transformers? 2. What method you have to apply to determine the efficiency of large transformer? 3. Draw the vector diagram for unity, leading p.f and lagging p.f at rated secondary current?Q.4/ choose true or false: 1. The reluctance of any core is proportional directly with the length of it and inversely with both the permeability and the cross-section area of it. 2. The number of parallel paths in wave windings is equal to twice of the number of poles. 3. In dc machines with same values of Z, N, Ø, the emf for wave winding type is more than emf of lab winding type. 4. If we insert a current in such a conductor subjected to a constant magnetic field, a movement will achieved giving the principle of electric generator.
- Q2. Put (T) for true sentences and (F) for fouls one of all the following sentences and (correct the fouls sentences): load. ondary Wharen 6) Astormer v regulation of ideal transformer is (unity). 7) The eddy currents always tend to flow perpendicular to the flux. 8) The magnetic field intensity is a vector quantity perpendicular to the direction of field density vector. 9) The areas of the hysteresis loop is a measure of heat energy lost per cycle so that choosing the hard magnetic material is better for construction of magnetic circuits. 10) In the short and open circuit test the core loss can be measured on either side of the transformer but the copper losses measured in the low voltage side.Figure Q1 shows a transformer core that has the primary winding (N,) of 500 turns and second winding (N;) of 250 turns. The absolute permeability (uo) is 47x10-7 H/m. Ignore the leakage flux. Show how the total MMF of the magnetic circuit is calculated, giving that the primary current (Ip) is 0.3 A and the secondary current (Is) is 0.2 A. Core Primary Winding Secondary Winding 20 cm N=500 turns 40 cm N,-250 turns 40 cm 20 cm 20 cm 20 cm Depth of Core=30 cm Leakage Flux Main Flux Figure Q1: Transformer coreFind the generated line-to-line emf in volts in the armature of a 4 pole, 60 Hz, wye-connected 3-phase generator having flux/pole of 0.15 Wb sinusoidally distributed, 4 slots per pole per phase and 4 conductors/slot. The armature winding is double layer with a coil span of 150 electrical degrees. b. 2,210.4 c. 1,928.6 d. 2,047.5 a. 2,123.8
- - Prove that the primary and secondary E.M.F. lag behind the flux by 90 degree. 2- It is not possible to connect in parallel Y/A and Y/Y 3-ph transformer. why? 3- Prove that the value of the circulating current at no-load is greater than its value at load when connecting two transformers in parallel. 4- What data can be obtained from the open circuit test on the transformer.The hysteresis coefficient of the core material of a power transformer is 110J/ m3. The eddy current coefficient is 132.87J/m3. The volume of the core is 0.005m3, the thickness of the iron is 0.07 m and the maximum flux density is 1.12T. If the supply frequency is 50 Hz: (a) Determine the hysteresis loss (b) Determine the eddy current loss (c) Determine the core loss of this transformer. (d) Explain how the eddy currents are generated. Suggest one method to minimise this loss. (e) Illustrate the hysteresis losses using a fully labelled hysteresis loop.current flowing in the of a transformer creates an alternating which establishes an alternating flux in the core. The is calculated as the of the coil current and number of The flux, according to Webber's law is the of the coil mmf to the of the core. • According to law, the alternating flux induces a voltage across the secondary winding. Secondary current flows when a is connected across the secondary terminals. The load current, according to law is calculated as the of the induced voltage and the load impedance.
- What is the main direct cause of reactive power in AC system?A. Resistance of transmission linesB. Inductance and capacitance in the loadsC. Ideal transformer connected in the systemD. Power produced by generatorProblem 5 Consider a three winding transformer with the following particulars: = Z₁ Z2 Z3 =0.02 + j0.08 £, V₂ = 400 V, 12 = 60/30° A, and I3 = 50/-40° A. Assume that V₂ is the reference phasor, calculate: The intermediate voltage Vo. a. b. The primary current I₁ and the primary voltage V₁. c. The tertiary voltage V3 referred to the primary side. d. The apparent powers and the power factors at the primary, secondary and tertiary terminals. e. The transformer efficiency.A shunt generator supplies a 34kW load at 225V through cables of resistance, R = 126m2. If the field winding resistance, Rf =680 and the armature resistance, Ra =42m2. Determine the following below: The terminal voltage is, The e.m.f. generated in the armature is, A 4 pole generator with wave wound armature has 50 slots each having 28 conductors. The flux per pole is 0.01 Wb. (i) At what speed must the armature rotate to give an induced EMF of 235V is, (ii) What will be the voltage developed, if the winding is lap connected and the armature rotates at the same speed is,