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- uz In a PMMC, analyze the changes in deflection torque produced.with Increments in flux per pole. O a. Deflection torque Increased O b Deflection torque Decreased O cThere is no relationship between the sald two O d. Deflection torque Unchanged search2-The Magneto motive force of a steel-ring of 25 cm mean diameter- If it is wound uniformly with 700 turns of wire carrying a current of 2 amp. a-1500 AT b-2000 AT c-1800 AT d-1400 AT 3-The self-inductance cocfficient of a d.c. electromagnet- whose field winding is wound with 960 turns and has resistance of 50 2 when the exciting voltages is 230 V and the magnetic flux linking the coil is 0.005 Wb. a-10.43mH b-10.43H c-1.043H d-0.1043 H 4- An iron rod, 2 cm in diameter and 20 cm long is bent into a closed ring and is wound with 3000 turns of wire. It is found that when a current of 0.5 A is passed through this coil, the flux density in the coil is 0.5 Wb/m2. The magnetic field intensity of it -- a-300AT/m b-30AT/m c-3000AT/m d-300AT/cmc dep15m Problem 2 A ferromagnetic core with a relative permeability of 2000 is shown in Figure. The dimensions are as shown in the - 30 cm 30 cm 7 cm diagram, and the depth of the core is 7 cm. The air gaps on the left and right sides of the core are 0.050 and 0.070 cm, respectively. If there are 300 turns in the coil wrapped around the center leg of the core and if the current in the coil is 1.0 A, what is the flux in each of the left, center, and right legs of the core? What is the flux density in each air gap? 30 cm 0.05 cm 300 turns 0.07 cm 7 cm
- A magnetic ring has reluctance of 1.675 × 10⁰ AT weber. The flux to be produced by the coil is 800 x 10 webers, then the AT required for the m.m.f. will beA ring of ferromagnetic material has a rectangular section. The inner diameter is 15 cm.The outer diameter is 24 cm. And the thickness is 5 cm. There is a coil of 500 turns wound onthe ring. When the coil has a current of 10 A, the flux in the core is 0.0007 Wb. Theaverage length of the ring is Ln=0.66m Determine:a) The magnetomotive force.b) The intensity of the magnetic field and the flux density.c) Reluctance, permeability and relative permeability.A shunt generator delivers 400A at 230 V and the resistance of the shunt field and armature are 50 and 0.03 Q respectively. the generated e.m.f. equals to 243.638 V 239.138 V 242.138 V 240.638 V
- 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.× 4:03 K s.eng.ruh.ac.lk □ Û 8. Figure 4 shows the core of a simple dc motor. The magnetization curve for the metal in this core is given by Figure 5 and Figure 6. Assume that the cross-sectional area of each air gap is 18 cm² and that the width of each air gap is 0.05 cm. The effective diameter of the rotor core is 4 cm. L It is desired to build a machine with as great a flux density as possible while avoiding excessive saturation in the core. What would be a reasonable maximum flux density for this core? ii. What would be the total flux in the core at the flux density of part (i)? iii. The maximum possible field current for this machine is I A. Select a reasonable number of turns of wire to provide the desired flux density while not exceeding the maximum available current. Flux Density, B (T) 2.8 སྤྲ ཤཱ ཀ ཀཱ བྷ ཀ ཡཱཾ བ ་ 1.2 1.0 0.4 0.2 4-48cm Figure 4 0 10 20 30 40 50 100 → Depth 4 cm -0.05 cm 200 300 500 1000 2000 Magnetizing Intensity, H (A.turns/m) Figure 5 Magnetization curve…moodle.nct.edu.om/mod/quiz/attempt.php?attermpt=6123858&.cmid 63002#question-96 Portal When the load on a series generator is decreased, then the flux produced will be increased. Select one: O True in O False The accelerating anode in CRO is also called as positive electrode. Select one: O True O False MIEE2110M The neutral current in an unbalanced star connected system is not equal to 33°C Sunny hp
- A 420 V, four-pole, 25 kW DC generator has a wave-connected armature winding with 846 conductors. The mean flux density in the air-gap under the interpoles is 0.5 Wb/m2 on full load and the radial gap length is 0.4 cm. Calculate the number of turns required on each interpole.A 6 pole DC wave wound generator has 28 armature conductors with flux per pole is 23 mWb and the e.m.f generated is 64 V, then the speed of the machine is O 99.38 rps O 0.63 rps O 33.13 rps O 6.34 rps The thermocouples are suitable for temperature measurement applications in the range of 200°C to over 2000°C. Select one: O True O FalseThe frequency of voltage generated in SG depends on: Select one:a. Number of polesb. number of poles and speed rotationc. Field currentd. Rotor speede.Number of poles, speed rotation and type of winding