What is the main function of a circuit breaker?, Control voltage, Interrupt fault current, Increase current, Convert current, What does a circuit breaker protect against?, Voltage drop, Power loss, Overcurrent, Frequency change, During normal operation, the breaker contacts are:, Open, Closed, Partly open, Moving, What happens first during a fault?, Contact closing, Fault detection, Arc extinction, Resetting, What can form when breaker contacts open under load?, Spark, Surge, Arc, Flash, Why is the arc extinguished?, To reduce voltage, To close the contacts, To increase resistance, To stop current flow, MCBs are mainly used for:, Small Electrical loads, Large Electrical Loads, High Current System, High Voltage System, Why are MCBs used for small loads?, High breaking capacity, Large size, Low current rating, High voltage rating, Compared with an MCCB, an MCB is generally used for:, Smaller loads, Larger loads, Higher voltages, Generators only, MCCBs are generally used for:, Small lamps, Larger feeders, Signal circuits, Emergency lights, Which breaker suits a large motor feeder?, MCB, MCCB, ACB, VCB, What medium does an ACB use for arc extinction?, Oil, Air, Vacuum, Water, Where is an ACB commonly used on ships?, Main switchboard, Small instrument, Cabin light, Portable radio, Why are ACBs used on main switchboards?, High current capacity, Low current capacity, Small size, Low voltage only, Which shipboard equipment may use a VCB?, Cabin light, Emergency lamp, Propulsion motor, Small radio, Where does the arc form in a VCB?, Vacuum interrupter, Generator, Transformer tank, Control panel, In normal operation, current flows through:, Open contacts, Closed contacts, The arc, The trip coil, What does the trip mechanism do?, Detects and opens, Closes and increases, Cools and regulates, Measures and converts, Before working on a disconnected circuit, you should:, Assume it is dead, Verify no voltage, Reset the breaker, Touch the conductors, Why should repeated resetting be avoided?, It reduces voltage, It cools the breaker, It may worsen the fault, It increases frequency, Which breaker suits a main bus-tie?, MCB, MCCB, ACB, VCB, What happens after contact opening?, Reclosing, Resetting, Arc extinction, Energizing, Which statement best describes normal breaker operation?, Contacts are open and an arc flows, Contacts are open and current flows, Contacts are closed and current flows, Contacts repeatedly open and close, What would happen if the arc were not properly extinguished?, The contacts would automatically close, Current could continue flowing, Voltage would become zero, The load would automatically reset, Which pairing is LEAST appropriate?, MCB — lighting circuit, MCCB — large auxiliary feeder, ACB — generator feeder, VCB — cabin lighting

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