easa modules questions

The Difference Between Fuse and Circuit Breaker is given below in the tabulated form BASIS FUSE CIRCUIT BREAKER Working Principle Fuse works on the electrical and thermal properties of the conducting materials. Circuit breaker works on the Electromagnetism and switching principle. Reusability Fuses can be used only once. Circuit breakers can be used a number of times. Status indication It does not give any indication. It gives an indication of the status Auxiliary contact No auxiliary contact is required. They are available with auxiliary contact. Switching Action Fuse cannot be used as as an ON/OFF switch. The Circuit breaker is used as an ON/OFF switches. Temperature They are independent of ambient temperature Circuit breaker Depends on ambient temperature Characteristic Curve The Characteristic curve shifts because of the ageing effect. The characteristic curve does not shift. Protection The Fuse provides protection against only power overloads Circuit breaker provides protection ag

What is Static Electricity? Walking across the carpet, you reach for the doorknob and..........OUCH!!! You get a static shock. Or, you come inside from the cold, pull off your hat and......static hair! The static electricity makes your hair stand straight out from your head. What is happening? And why is there so much more static during the winter? Learn how to Eliminate static electricity in your home, car & office. To understand static electricity, we have to learn a little bit about the nature of matter. Or in other words, what is everything made of? Everything Is Made Of Atoms Imagine a pure gold ring. Divide it in half and give one of the halves away. Keep dividing and dividing and dividing. Soon you will have a piece so small you will not be able to see it without a microscope. It may be very, very small, but it is still a piece of gold. If you could keep dividing it into smaller and smaller pieces, you would finally get to the smallest piece of gold possible. It is called an

Generators – Working, Types & Advantages Generator is a machine that converts mechanical energy into electrical energy. It works based on principle of faraday law of electromagnetic induction. The faradays law states that whenever a conductor is placed in a varying magnetic field, EMF is induced and this induced EMF is equal to the rate of change of flux linkages. This EMF can be generated when there is either relative space or relative time variation between the conductor and magnetic field. So the important elements of a generator are: Magnetic field Motion of conductor in magnetic field Working of Generators: Generators are basically coils of electric conductors, normally copper wire, that are tightly wound onto a metal core and are mounted to turn around inside an exhibit of large magnets. An electric conductor moves through a magnetic field, the magnetism will interface with the electrons in the conductor to induce a flow of electrical current inside it. The conductor coil and

What is AC Generator? Modern AC sources are, almost exclusively, induction generators, where the principle of work is based on electromagnetic induction. In this case, the electromagnetic current is obtained by rotating the conductors in the magnetic field. Today, almost all alternating current generators are three-phase. This means that in their movable part, which is called a rotor, they have three separate coils, placed between each other at an angle of 120◦, in which three EMC are phase-shifted precisely by 120◦, or in time sequence for a third period. Coils are usually indicated by the letters R, S and T, each of which defines a single phase. Depending on the binding of these coils, the transmission of electricity from the generator to the consumer is carried out with 4 or with 3 conductors. If at the beginnings of all the coils are bound at one point (the so-called zero point), then we are talking about star connection. In that case, the other ends of each coil, are connected wit

Difference Between AC and DC Generator 1. Design of AC and DC Generator The stator in DC generators is in form of a hollow roller with magnetic poles on the inside. The rotor consists of a core, a shaft, a winding and a collector. The core consists of mutually insulated dynamo sheets with grooves. The grooves are wrapped in copper wire whose ends are connected to the collector. The collector is in the form of slices attached to the shaft. Carbon brushes move along the collector and can charge/discharge current. The stator of AC generators has on the inside of the roller a longitudinal grooves in which there are windings, in contrast to a DC electromotor where magnetic poles are located. When the current flows through the windings in the stator, a magnetic field appears. The rotor is similar to that of a DC generator, only instead of the collector on the shaft there are two mutually isolated rings. Rotating of the rotor creates alternating current in the stator coils which is passed to

Summary of AC and DC Generator A generator is a machine that converts the mechanical energy of a power machine into electrical energy. DC generator consists of stator and rotor. On the stator there is a permanent magnet or wire windings that are charged with DC, forming electromagnets that replace permanent magnets. The rotor also has windings that are powered by DC. Although DC current still finds its application in a large number of areas, today it is quite clear that alternating current has great advantages, especially in meeting the needs of large energy consumers. Rotor of AC generators consist of serial-bound magnets (in fact, they are electromagnets), and the stator is a coil.

What is DC Generator? Contemporary developments are aiming towards eliminating direct current machines such as the DC generator, but they are still extensively used when a very smooth voltage is required, which cannot be achieved by a synchronous alternator with a diode or a network adapter. The basic parts are stator and rotor. The stator is usually made of permanent magnet, while the rotor from soft iron with copper conductors through which the current flows. The current is fed to the rotor via brushes that come across segments of copper. In order to rotate the rotor continuously and not to make a short circuit when the  brush touches two adjacent segments, the rotor must have at least three segments, while usually there are more than 10. The DC current of the stator winding creates a permanent magnetic field. Rotor rotates in this magnetic field and due to dynamic induction, it produces an EMC. All electromotive forces under one pole are in the same direction, and under another in t

CHAPTER 4  Human Factor Important Points Ambient light...............Minimum level Task light.........Maximum level Highest temperature of human body is.........at a/noon Alertness is lowest when body temperature is lowest Vibration less than 3 HZ affects  Aletness ....................with temperature Chapter 5  Human Factor Change from sitting to standing position ......after 1 hr Change from monitoring in atleast........after 1 / 2 hrs

Chapter 2 HUMAN FACTOR Cornea controls focusing of eye from 70 to 80 % Iris controls quantity of light entering eye Luminicence level 5 times Light enters eye through cornea Eye makes 3 dimensional picture Hypermetropia longsightedness Myopia short sightedness Longsightedness eye ball is shorter than normal Shortsightedness eyeball is longer than normal Longsightedness use convex lens For short sightedness use concave lens In longsightedness images is formed behing retina in shortsightedness image is formed in front of retina Astigmatism is when mishapen cornea Astigmatism irregular shape appear Colour blindness normally red and green Colour blindness rare cases blue and yellow Colour blindness in men 8 percent Colour blindness in women 0.5 percent A/c insp by eye / visual 80 percent Easy reading 2 Legability ....> font size, space between words and capital letters Typography.....> page layout, colour coding , under line and spacing Understanding ....> Goood writing styles Ear

Logic gates (AND, OR, XOR, NOT, NAND, NOR and XNOR) A logic gate is an elementary building block of a digital circuit. Most logic gates have two inputs and one output. At any given moment, every terminal is in one of the two binaryconditions low (0) or high (1), represented by different voltage levels. The logic state of a terminal can, and generally does, change often, as the circuit processes data. In most logic gates, the low state is approximately zero volts (0 V), while the high state is approximately five volts positive (+5 V). There are seven basic logic gates: AND, OR, XOR, NOT, NAND, NOR, and XNOR. The AND gate is so named because, if 0 is called "false" and 1 is called "true," the gate acts in the same way as the logical "and" operator. The following illustration and table show the circuit symbol and logic combinations for an AND gate. (In the symbol, the input terminals are at left and the output terminal is at right.) The output is "true&q

What do AC meters show? Is it the RMS or peak voltage? AC voltmeters and ammeters show the RMS value of the voltage or current. DC meters also show the RMS value when connected to varying DC provided that the DC is varying quickly; if the frequency of the parameter being measured is less than about 10Hertz you will see the meter reading fluctuating.