EWRB theory prep – MCBs Exam Questions With All Correct Answers
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Course
EWRB theory - MCBs EWRB theory - MC
Institution
EWRB Theory - MCBs EWRB Theory - MC
EWRB theory prep – MCBs Exam Questions With All Correct Answers
types of MCB trips - Answer-thermal
magnetic
/.thermal tripping - Answer-bi-metal strip, used for overload currents protection
/.magnetic tripping - Answer-magnetic inductor, used for short circuit protection
/.reset pro...
EWRB theory prep – MCBs Exam
Questions With All Correct Answers
types of MCB trips - Answer-thermal
magnetic
/.thermal tripping - Answer-bi-metal strip, used for overload currents protection
/.magnetic tripping - Answer-magnetic inductor, used for short circuit protection
/.reset procedure - Answer-reset to OFF
reset to ON
/.arc containment includes - Answer-horns carry current to chute, allow arc to jump out
arc chute lengthens distance for arc to travel
oil suppresses arc
splitter plates split the arc
/.arc control factors - Answer-reduced horns width minimize arc x section
more plates split arc into multiple smaller voltages
maximize arc chute increases travel distance for arc
/.Four key parts of MCBs - Answer-A. trip operating unit
B. control contacts unit
C. arcing ext. unit
D. frame unit
/.describe (A. trip operating unit ) component function - Answer-bi-metal/mag. provides
mechanism for detection of fault current and opens contacts
/.describe (B. control contacts unit ) component function - Answer-contacts allows the
supply current to flow during normal running when MCB is closed
/.describe (C. arcing ext. unit ) component function - Answer-all inclusive factors - horns,
chamber chutes, oils, splitter plates, used to control and extinguish fault arc
/.describe (D. frame unit ) component function - Answer-molded case exterior provides
a rigid, mechanically strong, insulated housing for MCB parts
/.Low Voltage MCB rating - Answer-600V
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