Saturday , February 16 2019

Full Wave Rectifier And Its Types AC/DC Converter

The DC level obtained from a sinusoidal input can be improved 100% using a process called full wave rectification. Although half wave rectifiers have some applications, the full wave rectifier is the most commonly used type in DC power supplies. A full wave rectifier allows unidirectional (One-way) current through the …

Half Wave Rectifier AC/DC Converter

A fundamental application of the diode is the rectifier. The process of removing one-half the input signal to establish a DC level is called half wave rectification. A diode connected to an AC source and to a load resistor forms a half wave rectifier. The below given figure illustrates the …

Kirchhoff’s Current Law (KCL) Kirchhoff’s Circuit Laws

“Kirchhoff’s current law states that the algebraic sum of the currents that arrive at a point is equal to zero.” It is the sum of the currents that flow into a terminal is equal to the sum of the currents that leave it. Let’s consider five currents arriving at a …

Kirchhoff’s Voltage Law (KVL) Kirchhoff’s Circuit Laws

“Kirchhoff’s voltage law states  that the algebraic sum of the voltages around a closed loop is zero.”  In a closed circuit, Kirchhoff’s voltage law (KVL) means that the sum of the voltage rises is equal to the sum of the voltage drops. In our methodology it is not necessary to …

MCQ on Electrostatics

1) Which of the following is a vector quantity electrical potential electrical field intensity electric charge none of the above 2) The unit of field intensity is coulomb coulomb/m2 webber newton/coulomb 3) Coulomb’s law for the force between electric charges most closely resembles with newton law of motion law of …

MCQ on DC Motor

1) Brushes of DC Motors are made of carbon soft carbon hard carbon aluminium 2) Armature reaction of an unsaturated DC machine is crossmagnetising demagnetizing magnetizing none of the above 3) Eddy current are induced in the pole shoes of a DC machine due to oscillating magnetic field pulsating magnetic flux …

DC Motor Interview Questions

1) What is the principle operation of DC Motors? 2) What is back e.m.f in a DC motor? 3) Why is shaft torque less than armature torque in a DC motor? 4) Why series motor cannot be started on no-load? 5) In a generator, the main flux is distorted in the direction …

MCQ on DC Generator

1) The yoke of the DC generator is made of silicon steel soft iron aluminium cast steel 2) The armature of a DC generator is made of silicon steel soft iron aluminum cast steel 3) The coupling field between electrical and mechanical system of a DC generator is electric field …