A. a capackive reactance
B. an inductive reactance
C. a resistance increasing with voltage rise across the arc
D. a resistance decreasing with voltage rise across the arc
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Related Mcqs:
- Which of the following medium is employed for extinction of arc in air circuit breaker?
- A. Water B. Oil C. Air D. SF6...
- 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...
- Arc in a circuit breaker is interrupted at___________?
- A. zero current B. maximum current C. minimum voltage D. maximum voltage...
- The arcing contacts in a circuit breaker are made of______________?
- A. copper tungsten alloy B. porcelain C. electrolytic copper D. aluminium alloy...
- The voltage appearing across the contacts after opening of the circuit breaker is called__________voltage
- A. recovery B. surge C. operating D. arc E. none of the above...
- Ionization in circuit breaker is facilitated by___________?
- A. high temperature B. increase of mean free path C. increasing field strength D. all of the above...
- Insulation resistance of high voltage circuit breakers is more than________________?
- A. 1 mega ohms B. 10 mega ohms C. 100 mega ohms D. 500 mega ohms...
- To reduce short circuit fault currents are used_____________?
- A. reactors B. resistors C. capacitors D. none of the above...
- Air blast circuit breakers for 400 kV power system are designed to operate in_______________?
- A. 100 microsecond B. 50 millisecond C. 0.5 sec D. 0.1 sec...
- The information to the circuit breaker under fault conditions is provided by____________?
- A. relay B. rewirable fuse C. H.R.C. only D. all of the above...
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