Engr.Tech

Index => Quiz    Show all questions Previous   Next The Function of Breather in a Transformer is   ?     To Provide Cooling Air   ?     To filter the Transformer Oil   ?     To provide oxygen to the cooling oil   ?     To arrest flow to moisture when outside air enter the transformer Olymic is the Airline of   ?     Greece   ?     Lebnon   ?     Egypt   ?     Syria Which of the following is minimised by the laminating the core of a transformer?   ?     Hysteresis Loss   ?     Eddy Current Loss   ?     Heat Loss   ?     All of the Above International organization ICAO is abbreviation of   ?     International Court of Atomic Operation   ?     Intergovernmental Court of Atomic Operation   ?     International Civil Aviation Organization   ?     International Court of Aviation Operations Sabeena is the Airline of   ?     Iran   ?     Belgium   ?     Afghanistan   ?     Iraq

Hydrograph:  A hydrograph is a plot of the variation of discharge with respect to time (it can also be the variation of stage or other water property with respect to time). Discharge is the volume of water flowing past a location per unit time (usually in cubic feet per second (cfs)). Topograph:  Topography  is the study of the shape and features of the  surface  of the  Earth  and other     observable  astronomical objects  including  planets ,  moons , and  asteroids .The topography of an area could refer to the surface shapes and features themselves, or a description (especially their  depiction  in maps). Hectograph:  The hectograph was an early duplicating method. "Hecto" means one hundred, so this is a method designed to make (roughly) a hundred copies of something. With the advent of cheap computer printers, there's not a lot of practical use for this technology. But it's a fun method of duplicating, and produces surprisingly good copies. With this

What are  DC Drives? 1.0    Introduction DC drives are defined as Electric drives using DC motors as prime movers. DC motor drives were dominated variable speed applications before the introduction of Power Electronic converters. But they are still popular even after the invention of power electronics. Common applications are rolling mills, hoists, traction, and cranes. •          Controlled rectifiers provide a variable dc output voltage from a fixed ac voltage, whereas a dc-dc converter can provide a variable dc voltage from a fixed dc voltage. •          Due to their ability to supply a continuously variable dc voltage, controlled rectifiers and dc-dc converters made a revolution in modern industrial control equipment and variable-speed drives, with power levels ranging from fractional horsepower to several megawatts. •          Controlled rectifiers are generally used for the speed control of dc motors. •    

In the below mentioned figure 1 we can see the connections of two transformer when they are connected in series. There are two transformers of rating 220/12 volts.                                                                                                   Figure 1                      Primary Winding               =            Connected in Series Secondary Winding         =             Connected in Series When primary of two transformers are connected in series then voltage will divide in each winding of both transformers equally. With the same configuration at output the voltage will also divide at secondary if secondary winding is connected in series. We can see in above figure clearly that 6 volts will appear across each secondary winding but current will remain same in both windings.  Transformers

Buchholz relay   is used for the protection of   transformers   from the faults occurring inside the   transformer . Short circuit faults such as inter turn faults, incipient winding faults, and core faults may occur due to the impulse breakdown of the insulating oil or simply the   transformer   oil. What is a Buchholz relay ? Buchholz relay is a type of oil and gas actuated protection relay universally used on all oil immersed transformers having rating more than 500 kVA. Buchholz relay is not provided in relays having rating below 500 kVA from the point of view of economic considerations. Why Buchholz relay is used in transformers? Buchholz relay is used for the protection of transformers from the faults occurring inside the transformer. Short circuit faults such as inter turn faults, incipient winding faults, and core faults may occur due to the impulse breakdown of the insulating oil or simply the transformer oil. Buchholz relay will sense such faults and closes the

  NEUTRAL WIRE:   That wire which completes the returning path of electricity is known as neutral. Without neutral wire any equipment will not energizes.    if you disconnect the neutral wire bulb will not glow anymore even the switch is at ON position. Figure 1 shows a bulb is connecting with live and neutral                 EARTH WIRE:     It is that wire which is used for safety only. Without this wire every electrical appliances will work but in case of fault it gives shock to person who touches its body. if this article is  helpful for you then please don't forget to click on the "follow" button on the left side top corner to know about the more articles.

THERMAL POWER PLANT Introduction: It is the most conventional source of electric power. It is also referred as coal thermal power plant and steam turbine power plant. A thermal power station is a power plant in which heat energy is converted into electrical energy. In most of places in the world the turbine is steam driven. water is heated turns into steam and spins a steam turbine which drives an electrical generator,  after it passes through the turbine the steam is condensed in a condenser and recycled to where  it was heated When fuel is burnt and water in the boiler started to become steam and then steam is again superheated and sends it to the turbine. The force of steam causes turbine to rotate hence turbine will rotate and electricity is produced.