Related Questions

The arcing contacts in a circuit breaker are made of
A copper tungsten alloy
B porcelain
C electrolytic copper
D aluminium alloy
The arc voltage produced in A.C. circuit breaker is always
A In phase with the arc current
B Lagging the arc current by 90°
C Leading the arc current by 90°
D None of the above
In order that current should flow without causing excessive heating or voltage drop, the relay contacts should
A Have low contact resistance
B Be clean and smooth
C Be of sufficient size and proper shape
D Have all above properties
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
In a coil ignition system of petrol engines, a condenser is connected across the contact breaker in order to
A Prevent sparking across the gap between the points
B Cause more rapid break of the primary current, giving a higher voltage in the secondary circuit
C Both (A) and (B)
D None of the above
At series resonance, voltage across L is ___________ voltage across C
A Equal to but opposite in phase to
B Equal to but in phase with
C Greater than but in phase with
D Less than but in phase with
Circuit breaker in a stock exchange works as -
A a medium to spilt stocks
B An obstacle to excessive change in share price
C A policy for broker houses
D A constraint to issue bonus shares
Circuit breaker in a stock exchange works as ----
A A medium to split stocks
B An obstacle to excessive change in share price
C A policy for broker houses
D A constrain to issue bonus shares
The use of high speed circuit breaker -
A reduces the short circuit current
B increase the short circuit current
C improves system stability
D decrease system stability
Circuit breaker is the team generally used in:
A Stock Exchange
B Commercial
C Insurance Company
D Leasing Company

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