A permanent magnet dc motor has rotor radius of 1.3cm,magnetic thickness of 0.25cm and gap length of 0.05cm.The magnetic flux density in the motor is

Q: A permanent magnet dc motor has a rotor radius of 1.3 cm, magnetic thickness of 0.25cm, and a gap…

A: Electrical machines can be either generator, transformer or motors. They can be either Ac machines…

Q: A magnetic circuit has a length of 100 cm and cross-sectional area of 5 square cm. The total flux is…

A: Here, we have a magnetic circuit, for which we have to calculate the magnetic strength. The…

Q: An ideal dc generator has regulation of 40% O 20% 30% O Zero

A:

Q: The speed of a dc motor is directly proportional to the flux inversely proportional to applied…

A:

Q: A permanent magnet dc motor has rotor radius of 1.3cm,magnetic thickness of 0.25cm and gap length of…

A: Radius of the rotor, r=1.3 cm

Q: In induction type energy meter is placed at the edge of Aluminum disc, which controls the speed of…

A: An energy meter is shown below:

Q: The speed of rotating magnetic field of 8 pole 50 Hz induction motor is?

A: Given, Frequency, f = 50 Hz. The number of pole, P =8

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

A:

Q: A ferromagnetic core in the shape of a doughnut has a cross-sectional area of 0.11 m2 and an average…

A: The reluctance of the magnetic circuit is defined as:

Q: 4-Is the residual magnetism on the generator is necessary how can you cancel these residual…

A: The residual magnetism in the generator is necessary because it helps in the voltage build-up of the…

Q: The generated emf

A:

Q: The source of the steady magnetic field may be

A: As it is not mention which question has to solve so I am solving only first question

Q: HWA long solenoid that has 1000 furns uniformity distributed over a length of 0.4m produces a…

A:

Q: What is the difference between wound rotor induction machines and squirrel cage machines

A: The wound rotor (also called as slip ring) and squirrel cage machines are the type of rotor in…

Q: A magnetic ring has reluctance of 1.675 x 106 AT weber. The flux to be produced by the coil is 800 x…

A: Given a magnetic ring has, Reluctance = 1.675×106 ATweber Flux = 800×10-6 weber.

Q: If residual magnetism of a shunt generator is destroyed due to any reason, it may be restored by…

A:

Q: Maximum torque is realized when an armature winding is with the magnetic field at 90° O inline or at…

A: With reference to synchronous machines, the load angle or the power angle is the angle between the…

Q: The magnetic moment for the circular loop with side a and current I is a. zero O b. ma2 | OC. 2π al…

A:

Q: The flux per pole of a two-pole generator is 7.5x10^-5 wb. A coil of 600 turns rotates in this…

A: Given Data:-ϕ=7.5×10-5 wbZ=600 turnstime take from maximum  to one minimum =0.0187 sec

Q: An air core toroidal coil has 120 turns, the length is 12 cm and 12 sq. cm in area What is the…

A:

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: electromotive force created by a direct current generator is proportional to Flux/pole…

A: We need to tell about generated emf . We know direct formula for emf .

Q: A magnetic circuit with a cross-sectional area of 20 cm? is to be operated at 50 Hz from a 120 V rms…

A: Given values are - AreaA=20cm2=20×10-4m2f=50HzVRMS=120VoltBm=1.8T

Q: The frequency of rotor current in an induction motor is       slip times the frequency of stator…

A: The frequency of the rotor is based on the value of slip and input frequency. The slip value can be…

Q: Magnetic losses of a compound and shunt generator is approximately ranges from : A) 41-50%  B)…

A: The correct option is c (20% to 30%).

Q: A separately excited dc generator generates 230 V when driven at 1200 rpm of the field flux is…

A:

Q: The maximum amount of voltage is induced time(s) in 3600 of mechanical rotation for a single loop…

A: The explanation is as follows.

Q: Full scale deflecting torque of 10 A MI Ammeter is 5 x 10- N-m. The rate of change of self…

A: Given values are - CurrentI=10ATorqueT=5×10-5N-m

Q: The magnetic flux through each turns off a 100-turn coil is (³-2) milli-webers where it is in…

A: Given, The magnetic flux, φ=t3-2t mWb. Number of turns, N=100 turns. Time. t = 2 seconds.

Q: The strength of the rotating magnetic field in a three phase induction motor is equal to times the…

A: rotating magnetic field of the induction motor rotates at a synchronous speed.

Stator and Rotor Magnetic Field

The stator and rotor magnetic field is the resulting magnetic field generated by a system of coils that are symmetrically aligned. They are supplied with polyphase currents. The magnetic field is generated by poly-phase (two or more phases) current or single-phase current. In the latter case, two field stator windings are supplied and two resulting electromagnetic fields are generated beyond the stage.