Unit 18 - Prepare for general electrical installations Quiz 3
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Q1           Score:  1
 High Blow Capacity
 High Breaking Capability
 High Breaking Capacity
 High Blow Capacity
Q2           Score:  1
 Electronic
 Magnetic
 Thermal
 Thermal magnetic
Q3           Score:  1
 severing live conductors with cable cutters
 large machines (motors) starting up
 insulation failure in a circuit
 incorrect conductor terminations (L to E for example)
Q4           Score:  1
 Residual current device
 Starter contactor
 Motor rated fuse
 Surge protective device
Q5           Score:  1
 Discharge lamps may flicker or go out
 Transient can be twice the line voltage
 Register on the energy meter as increased use of power
 Insulation damage
Q6           Score:  1
 During an earth fault
 During a short-circuit fault
 When a motor becomes jammed
 When a shower is switched on
Q7           Score:  1
 Low resistance fault causing a fault current to flow
 Caused by faulty appliances
 Occurs in a sound circuit
 Current greater than nominal flows
Q8           Score:  1
 Protective devices like fuses and breakers would not be activated
 Over voltage
 Over current
 Under voltage
Q9           Score:  1
 large overload faults
 short circuits between live and neutral
 earth-leakage faults
 a nail hammered into a wall, shorting-out live and neutral
Q10           Score:  1
 Fault protection
 Indirect contact
 Basic protection
 Direct contact


   



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