The ohmic resistance of a large magnetic contactor is measured to be 20 ohms. A 230 V 60 Hz is impressed upon the contactor and the current is taken as 3.2 amperes. Neglecting core loss, determine the inductance of the contactor in mH.
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GENERAL RLC CIRCUITS:
Solve and show your solution completely. Make sure your answers are in 4 decimals places.
The ohmic resistance of a large magnetic contactor is measured to be 20 ohms. A 230 V 60 Hz
is impressed upon the contactor and the current is taken as 3.2 amperes. Neglecting core loss,
determine the inductance of the contactor in mH.
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- Given a two magnetically coupled coils -coils physical structure is P11=P22 -self-inductance of coil 1: 288mH -coefficient of coupling: 0.75 -mutual inductance: 90mH -wound on a nonmagnetic core Determine the turns ratio N1/N2 BLANK If N1 =1200, what is the value of P1? BLANK microFor a motor design, you need to design a solenoid coil that produces a magnetic flux density (B) of at least 2000 gauss when a 10 mA current flows through the conductor. Due to space limitations, the coil only can be 10 turns over a 1 cm length. To obtain the needed performance, go to Table 3 and choose a core material for the coil.The two coils A and B wound coaxially on an insulating cylinder. It will be evident that the fluxes produced by a current i through the two coils are in the same direction, and the coils are said to be cumulatively coupled. If the direction of the current in B relative to that in A is reverse, then coils are said to be differential coupling. Suppose A and B to have self-inductances and henrys respectively and a mutual inductance M henrys. If two coils are connected in series, their effective inductance is found to be 12.0H. However, when the connections to one coil are reversed, the effective inductance is 8.0 H. If the coefficient of coupling is 0.6. a) Show that the total inductance of inductively coupled circuits is + ± 2M b) Calculate the self-inductance of each coil and the mutual inductance.
- A 500-turn coil is wound on an iron core. When a 120-V-rms 60-Hz voltage is applied to the coil, the current is 1 A rms. Neglect the resistance of the coil. Determine the reluctance of the core. Given that the cross-sectional area of the core is 5 cm2 and the length is 20 cm, determine the relative permeability of the core material.Given a two magnetically coupled coils -coils physical structure is P11=P22 -self-inductance of coil 1: 288mH -coefficient of coupling: 0.75 -mutual inductance: 90mH -wound on a nonmagnetic core Determine the turns ratio N1/N2 If N1 =1200, what is the value of P1? in microExplain the modifciation to be made to the schering bridge for the following situations: i) Hihg dissipation factor test objects II) High capacitance test objects Explain in easy language so i can understand
- A large motor has an armature whose inductance us 0. 12 H. The motor has no capacitance. The series resistance R of the armature's wire is 25Ω. (a) Calculate the power used by the motor when connected to a 120 V, 60Hz power source. (b) Calculate the capacitance of a series capacitor that maximizes the power used by the motor. (c) Calculate the power used when this capacitance is added. [Warning: Note that both I and tetha change when the capacitor us added to the circuit. Use the formula: P= IVcosA large motor has an armature whose inductance us 0. 12 H. The motor has no capacitance. The series resistance R of the armature's wire is 25Ω. (a) Calculate the power used by the motor when connected to a 120 V, 60Hz power source. (b) Calculate the capacitance of a series capacitor that maximizes the power used by the motor. (c) Calculate the power used when this capacitance is added. [Warning: Note that both I and tetha change when the capacitor us added to the circuit.]A coil has N=25 turns. The toroid on which the coil is wound has ID=5 cm and OD = 5.5 cm. The geometryresults in a mean path length of 0.165 meters and a cross sectional area of 4.91 micrometer squared. What equation is used for calculating the field strength (also called intensity) H along the mean-path length within the toroid? Calculate the Reluctance in the path of flux lines if Mr is 500.What is the resulting Inductance?
- Q-1: Give brief answer to the following: (Answer Ten only)1) what is the potential transformer used for in power substation?2) what is process leads to lowering the number of free electrons?3) what is The Townsend’s Criterion4) why Sulphur Hexafluorid has good insulation strength?5) What is Intrinsic Breakdown6) why do bubbles lead to breakdown of liquid?7) how to decease the ripple voltage of cockroft-walton voltage multiplier circuit8) how much the maximum charging current of A Van de Graaff generator has a beltwidth 1 m, a belt speed of 4 m/s, and charge density of 10 c/m29) Why does need for Reactive Power Compensation in test transformer?10) The output voltage of series resonant circuit is given by the formula _________11) what is impulse voltage and what is its standard wave shape?12) Which advice can measure impulse voltage?Consider a ferromagnetic ring (nucleus) that has a mean circumference of 40 cm, 300coiled copper turns and a sectional area of 5 cm2. A current of 2 is appliedA to winding, producing a flux of 1.5 mWb.Determine the permeability of the core material.Determine the relative permeability of the core material.If the ferromagnetic ring has an air gap of 2 mm. Find the required MMFso that the flux density in the gap is 0.5 T.A. A coil of 1000 turns is uniformly wound on a ring of non-magnetic material, the mean diameter being 20 cm. The cross-sectional area of the coil is 4 cm2. Determine the selfinductance of the coil. Ans. 0.8mH B.An iron core 0.4m long and 5 cm2. In cross section, is wound with 300 turns. When a current of 0.5 A flows in the coil, how much is the inductance of the coil. Assume the core has a permeability of 2500.