Deepakkumar Yadav
Neon Sign Tubes Construction : In the form of tube even upto 9 metre length and can be bend in manufacturing process to any shape/shapes. It is a glass tubing consisting of two electrodes normally cylindrical in shape, of iron, steel or copper. It contains neon. Different colours are obtained by varying composition of glass and … Read more
Neon Lamp Principle : “Electrons are emitted from cathode by subjecting the surface of the cathode to very high electric stress so that electrons are forcibly ejected from orbits of atoms against nuclear centrifugal force” Construction and Working : It has two closely spaced electrodes sealed within a soft glass envelope containing neon, at pressure of 8 torr … Read more
Sodium Vapour Lamp : Principle : “Electrons are emitted from cathode by subjecting the surface of the cathode to very high electric stress so that electrons are forcibly ejected from orbits of atom against nuclear centrifugal force”. Construction and Working : It consists of inner tube of U shape fitted with neon gas and globules of sodium. For … Read more
Mercury Vapour Lamp : Q. Explain with neat sketch construction and working of high pressure mercury vapour lamp. Principle : “When mercury discharge under low pressure gives mainly ultraviolet radiations. If pressure is increased to one or two atmospheres, its proportion of radiations in visible spectrum is increased and we get light having bluish tinge”. Construction … Read more
Effects of Faults on Power System : Q. State any four abnormal conditions which can develop In power system and state Its effect on power system. The most dangerous type of fault is a short circuit as it may have the following effects on a power system, if it remains unclear. Heavy short circuit current … Read more
Types of Faults : Q. State the different types of faults. Q. Classify faults. Q. List types of faults. Q. What are the common faults likely to occur? Suggest protections against such faults. Q. List out any four types of faults that can occur in a system and give causes for the same. Q. State … Read more
Ten Life Saving Rules : Don’t look the other way I am trained and certified to perform the site activities. I perform on site risk assessment prior to start of work. I clearly identify, isolate, secure, verify, earth and demarcate the work area. I wear all personal protective equipment’s required for each tasks. I obtain … Read more
Q. Explain the causes for faults. Q. State the causes of fault. Mostly the faults are caused by failure of insulation. The failure of insulation results in short circuits which are very harmful. Faults are also caused by breaking of conductors due to excessive heat or mechanical stresses. Most of the faults on Transmission lines … Read more
State the functions of protective system. As mentioned above, protective system should operate automatically under abnormal condition within minimum time. Apart from this it should have following essential features : Quick operation : To minimize the damage to the faulty part, the switchgear must operate as quickly as possible after the occurrence of fault If … Read more
Flame – Arc Lamp : Working principle : Two carbon rods kept face to face touching to each other connected to the source of electricity and if they are departed from each other to form a small air gap between them, an arc is produced with tremendous heat and a light is produced. The principle … Read more