Bissoy.com
Doctors Medicines MCQs Q&A

Which of the following acts as a protection against high voltage surges due to lightning and switching?

Which of the following acts as a protection against high voltage surges due to lightning and switching? Correct Answer Horn gaps

Arcing horns in a transformer form a spark gap across the insulator with a lower breakdown voltage than the air path along the insulator surface, so an overvoltage it will cause the air to break down and the arc to form between the arcing horns, diverting it away from the surface of the insulator.

Related Questions

Lightening conductors are used to protect building from lightning strikes. Which of the following statements is/are true about lightening conductors? 1) Lightening conductors create an electric field at its top that lightning strikes it preferentially 2) Lightning conductors reduce the effect of the strike by uniformly distributing the charge (current) over the surface of the building 3) Lightning conductors take all the charge (current) to deep down in the earth 4) Lightning conductors must be installed at a place taller than the building Select the correct answer using the code given below
Which of the following acts as a protection against high voltage surges due to lightening and switching?
To prevent damage from lightning, lightning conductors are used on tall structures. The lightning conductor
Which is most suitable protective devices that be used against lightning surges at above the tall buildings?
The question below is followed by three statements I, II and III. You have to determine whether the data given is sufficient for answering the question. You should use the data and your knowledge of mathematics to choose the best possible answer. How many runs Sachin scored against Kashmir? I. The difference between his score against Mumbai and against Delhi is equal to the difference between the score against Delhi and against Kashmir. II. The average run he scored against all three states Delhi, Kashmir and Mumbai is 100. III. He scored 25 runs more against Mumbai than Kashmir.
Consider the following statements. 1. SMPS generates both electromagnetic and radio frequency interference due to high switching frequency. 2. SMPS has a high ripple in output voltage and its regulation is poor. 3. The output voltage of SMPS is less sensitive with respect to input voltage variation. Which of the above statements are correct?
High voltage, high frequency surges can occur in the system due to _________________
In extra High Voltage lines, which conductor material is used for ground wire provided above the line conductors for protection against lightning?
Read the passage carefully and choose the best answer to each question out of the four alternatives.
Eight north Indian Ocean countries, namely, Bangladesh, India, the Maldives, Myanmar, Oman, Pakistan, Sri Lanka and Thailand, were asked to contribute names so that a combined list could be compiled. Each country gave eight names and a combined list of 64 names was prepared. This list is currently in use, and all cyclones arising in the north Indian Ocean are named from this list, with one name from each country being used in turn. Almost 38 or 39 names from the list have been used up, but since many cyclones dissipate long before they hit land, their names rarely figure in the papers or other media. The names that people do know about, and remember are, naturally, those that were most destructive ones, or very recent. Aila, in 2009 is remembered with a shudder for the enormous destruction it caused in West Bengal and Bangladesh; Phaillin, also for the damage it caused when it hit the Odisha coast in 2013. Two harmless cyclones, which also might remain in peoples memory, are the more recent ones of 2014 — Hudhud, which threatened the east coast of India and Nilofar, which was expected to, but did not, devastate the western coast. The names in the cyclone list are usually words one associates with storms; words which mean water or wind or lightning in various national languages. Sometimes they are names of other things — birds or flowers or precious stones. The name Aila, contributed by the Maldives means fire, the name Phaillin from Thailand means sapphire, the name Hudhud from Oman is the name of a bird, probably the hoopoe, and the name Nilofar, given by Pakistan, is the Urdu name of the lotus or water lily. The eight names suggested by India, and which are in the list of 64, are Agni, Akaash, Bijli, Jal, Leher, Megh, Sagar and Vayu, meaning in that order, fire, sky, lightning, water, wave, cloud, sea and wind. Five of these names (that is, up to Leher) have been used so far.
Which of the following names is a type of a precious stone?
Consider the following statements regarding corona: 1. It causes radio interference. 2. It attenuates lightning surges. 3. It causes power loss. 4. It is more prevalent in the middle conductor of a transmission line employing a flat conductor configuration. Which of the above statements are correct?