SOLUTION. ANSWERS SHOULD BE IN TWO DE CIMAL PLACES.  The armature of a two-pole dc machine has 30 slots, each slot has 4 conductors each. during its operation, only 75% of the conductors are directly under the pole. each pole measures 2 inches by 3 inches and produces ten million maxwells of flux. the armature core is 12 inches in length and 3.5 inches in diameter. the total resistance of the winding is 2 ohms. a) determine the frequency of the machine when running at 3600 rpm.

Q: For operation at 60 Hz and a given peak flux density, the core loss of a given core is 1W due to…

A:

Q: For the magnetic circuit shown in the figure, the iron core with N = 500 turns -Magnetic…

A: According to question: The cross sectional area is calculated as ∵a=πD24⇒a=π1×10-224⇒a=7.854×10-5m2…

Q: (a) Explain briefly what is fringing effect and leakage flux. (b) A ferromagnetic core is shown in…

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Q: The "Ohm's law" for the magnetic circuit states that the net magnetomotive force (mmf) equals the…

A: According to the equation of the Ohm’s law for the magnetic circuit:

Q: Given: N=1000 I=1A μ = 1000 a = 1200 Hb The magnetic core is made up of iron with square. The total…

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Q: SOLVE AND SHOW YOUR COMPLETE SOLUTION. ANSWERS SHOULD BE IN TWO DECIMAL PLACES. The armature of a…

A:

Q: SOLVE AND SHOW YOUR COMPLETE SOLUTION. ANSWERS SHOULD BE IN TWO DECIMAL PLACES. The armature of a…

A:

Q: A single-phase 111-V, 50-Hz supply is connected to a coil with 200 turns of a coil-core assembly as…

A: Given- Single-phase 111-V, 50-Hz supply, E=111 V, Frequency f=50 Hz, Number of turns N=200, To Find-…

Q: A magnetic circuit consists of silicon steel of 3000 permeability, of 0.078 m length and a…

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Q: Iron losses in a DC machine are independent of variations in

A: The explanation is as follows.

Q: A solenoid is 1 Cm long with a diameter of 0.5 Cm. The core is SiFe with a relative permeability of…

A: Length of solenoid Diamter Current I = 100 mA.Relative permeability Magnetic field

Q: Q-3 A) If tension surface of the globule in transformer oil is 0.05N/m, radius of globule is 1um,…

A: The critical electric field at which the globule becomes unstable is given by the expression as…

Q: flux of 0.5 Weber flows through a core with a total reluctance of 60,000 ampere-turns/Weber. How…

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Q: For the figure shown below, the permeability in the core is 4 x 10 Wb/A-tums-m. What is the value of…

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Q: A single-phase 111-V, 50-Hz supply is connected to a coil with 200 turns of a coil-core assembly as…

A: In this question,  We need to determine the magnitude of the maximum flux in the core.

Q: 3. A group of electromagnets that create flux in a d-c generator (the field circuit) has an…

A:

Q: The generated emf

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Q: fill inthe blank : field winding has large numberofturns of thin copper wire.                  a.…

A: Correct option is Shunt. shunt field winding has large number of turns of thin copper wire.  Where…

Q: In a 2 pole lap winding dc machine , the resistance of one conductor is 2Ω and total number of…

A: Given: A dc machine has, Total number of pole, P = 2. Resistance of one conductor, r = 2 Ω. Total…

Q: There are 144 slots in a 3-phase, 16-pole, 50 Hz., star connected alternator. There are 4 conductors…

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Q: the armature mmf can be -2 reduced by reluctance of the magnetic the circuit in the region of the…

A: The explanation is as follows.

Q: In a certain magnetic circuit, the core is represented two reluctances as shown below. Assume a…

A: The magnetic circuit diagram is shown below, Number of turns, N=640 turns.Current, I=2.2 A.

Q: The voltage induced in 8 poles lamp wound generator is 120 V with armature resistance = 0.3 2. What…

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Q: The full-scale deflecting torque of a 20 A moving-iron ammeter is 6 x 10¹5 N-m. What is the rate of…

A: Given- The full-scale deflecting torque, τ=6×10-5 N-m Current, I=20 A.   To find- The rate of change…

Q: A single-phase 111-V, 50-Hz supply is connected to a coil with 200 turns of a coil-core assembly as…

A: Given, Single phase transformer. Single phase supply voltage, e=111 V. Frequency, f=50 Hz. Number…

Q: They are usually made of copper. Field coils are former wound and placed on each pole and are…

A:

Q: Find whether the given statements are true or false, and do justify the following statementThe…

A: According to the question, we need to find whether the given statement is true or false."The…

Q: True or False: If the core material has a high reluctance, flux will flow freely in a magnetic…

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Q: A dc machine has hysteresis loss of 300 W and an eddy current loss of 200 W when running at 1200…

A: Hysteresis loss Wh=300 W eddy current loss We=200 W The speed is N=1200 rpm Total core loss…

Q: The magnetic structure in the figure below is made of silicon steel. Determine the values of IB…

A: Note: Relative permeability (μr) for silicon steel is not given . We assume μr = 2000     Given NB=…

Q: Q9 / What are the function of brushes , pole and commutator in DC machine

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Q: What is the benefit of electrical transformers if there is a load and if there is no load?

A: Transformer: Transformer is a static electrical device which is used to transfer the power from one…

Q: A single-phase 111-V, 50-Hz supply is connected to a coil with 200 turns of a coil-core assembly as…

A: Given- A Single phase transformer with, Single phase supply voltage, e=111 V. Frequency, f=50 Hz.…

Q: 3- A magnetic core with an air gap is shown in below Figure. The depth of the core is 3 cm, the…

A: Reluctance Reluctance is a property of magnetic material which opposes the flux in the magnetic…

Q: A wave wound armature of an eight-pole generator has 06 slots. Each slot contains 16 conductors. The…

A: Generator: It is used to convert the mechanical energy to the electrical power. It operates on the…

Q: A simple generator has a square armature 9.0 cm on a side. The armature has 80 turns of…

A: In the circuit, Find the value of frequency f. We know  Emf = 4.44fN Φm .  All parameters are given.

Q: The voltage induced in 8 poles lamp wound generator is 120 V with armature resistance = 0.3 Q. What…

A:

Q: SOLVE AND SHOW YOUR COMPLETE SOLUTION. ANSWERS SHOULD BE IN TWO DECIMAL PLACES.  The armature of a…

A:

Q: Calculate the phase and line voltages of three phase star-connected 4 pole small alternator having a…

A: Given data, The total flux is 0.30 Wb. The relative speed is 1500 rpm The number of pole is 4. The…

DC Series Motors

A DC motor is a type of electric motor which converts electric energy into mechanical energy. The forces that are produced by the magnetic field are what those common types of motors rely upon. Either electro-mechanical or electronic, all types of DC motors have some internal mechanism to change the current direction in part of the DC motors. As the DC motors could be powered from existing DC lighting power distribution systems, these motors were the first form of motors widely used. By changing the strength of the current in its field winding or by using a variable supply voltage, the speed of the DC motors can be controlled over a wide range.