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

A Horn gaps
B Thermal overload relays
C Breather
D Conservator

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.
Bissoy MCQ
#Transformers #Voltage Regulation

Related Questions

The dangers of a storm --- torrential rains, high winds and storm surges. (Select the word/phrase that appropriately fills in the gap)
A include
B includes
C including
D to include
Insurance refers to protection against an event that _________ happen whereas Assurance refers to protection against an event that _________ happen.
A May, may not
B Might, will
C Must, need not
D Will, will not
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A Bandwidth alternatives
B Switching alternating
C Inter organizational networks
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A J
B K
C L
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h,J,K,L,M,N and O are the only legislators eligible to vote on Bills 1,2 and 3, each of which will be passed if at least four legislators eligible vote in favor of it. each legislator must vote on all three bills; on abstentions are possible. The following is known : *H must vote against all three bills; each of the other legislators must vote in favor of at least one bill and against at lest one bill. *j must vote against Bills 1. *O Must vote against Bills 2 and 3. * L must the same way that K dose on all three bills.*N must vote the same way that O dose on all three bills. which of the following cannot be true ?
A J and K vote in favor of the same bill
B J and O vote in favor of the same bill
C J votes in favor of one bill and against two bills
D k votes in favor of two bills and against one bill
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A J
B K
C M
D N
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D Five
The hardware device Jhat acts as both a switching and connecting unit is called a(n):
A concentrator
B RS-232C port
C multiplexer
D communications processor
E None of the above

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