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  explain DC MOTOR PRINCIPLE  . When a conductor is placed in magnetic field is produced on the conductor. This force is given by F = B.L.I. Newton. The direction of the force is given by Fleming's left hand rule. F = B.LI. newtons B = magnetic flux density in weber/m2  I = current in conductor in amperes 1 = length of conductor in metres The electric motor converts electrical energy into mechanical energy or motion by using electromagnetic induction. When the field magnets of the motor are excited and it's Armature conductors are supplied with current from the supply mains, then they experience a force tending to rotate the armature  Armature conductors under North pole are assumed to carry currents downwards (crosses) and those under South-pole to carry currents upwards (dots). The direction of this force is given by Fleming's Left Hand Rule (also known as motor rule). . It is seen that each conductor experiences a force F which tends to rotate the armature in anti...

  K is the transformation ratio, then the secondary phase voltage of delta-delta connected three phase transformer will be a. 1 / K times of the primary phase voltage b. Equal to the primary phase voltage c. 1 / K ∧ 2 times of the primary phase voltage d. K times the primary phase voltage View Answer / Hide Answer ANSWER: d. K times the primary phase voltage

  Single Phase Rectification Rectification is the process of linking an AC power supply to a connected DC load by means of solid state semiconductor devices Rectification converts an oscillating sinusoidal AC voltage source into a constant current DC voltage supply by means of diodes, thyristors, transistors, or converters. This rectifying process can take on many forms with half-wave, full-wave, uncontrolled and fully-controlled rectifiers transforming a single-phase or three-phase supply into a constant DC level. In this tutorial we will look at single-phase rectification and all its forms. Rectifiers are one of the basic building blocks of AC power conversion with half-wave or full-wave rectification generally performed by semiconductor diodes. Diodes allow alternating currents to flow through them in the forward direction while blocking current flow in the reverse direction creating a fixed DC voltage level making them ideal for rectification. However, direct current which has ...

  Delta-Delta Connection in Three Phase Transformers - MCQs with Answers Q1. If K is the transformation ratio, then the secondary phase voltage of delta-delta connected three phase transformer will be. a. 1 / K times of the primary phase voltage b. Equal to the primary phase voltage c. 1 / K ∧ 2 times of the primary phase voltage d. K times the primary phase voltage ANSWER: d. K times the primary phase voltage

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