A ________ switch combines crossbar switches inseveral (normally three) stages. A) multistage B) multiple crossbar C) multiple path D) none of the above

A ________ switch combines crossbar switches inseveral (normally three) stages.
A)
multistage
B)
multiple crossbar
C)
multiple path
D)
none of the above
by

1 Answer

Answer :

multistag
by

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Description : The contacts of high voltage switches used in power system are submerged in oil. The main purpose of the oil is to (a) lubricate the contacts (b) insulate the contacts from switch body (c) extinguish the arc (d) all of the above (e) none of the above

Last Answer : (c) extinguish the arc

A bulb in a staircase has two switches, one switch being at the ground floor and the other one at the first

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As shown in the illustration, all 'MS' contacts are opened and closed by means of ________. EL-0073 A. operating coils B. magnets C. manual operation of the master switches D. solenoid switches

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