Question

UNIT 14 Practice Questions 4,5 Pr The multipoint grounded neutral is intended to reduce he PRACTICE QUESTIONS 14.1 Current Flow 1. Electrons leaving a power supply are always trying to neutral voltage drop, assist in clearing to-neutral faults, and reduce elevated voltage causet line-to-ground faults return to the same power supply; they are not trying to g0 into the earth. (a) primary/primary (b) secondary/secondary (c) primary/secondary d) secondary/primary (a) True b) False 2 When alternating current is appled to the primary of a 14.3 Ulility Ground-Fault Carvent Path transformer, it induces a voltage in the secondary which causes electrons to leave one end of the tanstormers Metal parts of the electric utility equipment are bontet to the utility neutral to provide apath to the power secondary through the load and return over the remaining circuit's conductors to the transformer's secondary source to assist in clearing a line-to-case fault. a) high-resistive (c) ground 14.6 L (a) True b) False 10. 14.2 Utility Neutral Current Path The earth generally has low enough impedance to permt sufficient fault current to return to the source, thereby opening the utility's circuit protection device. 6. 3. The electric ubility grounds the primary and secondary neutral conductor to the earth at multiple locations for the purpose of reducing the of the return current pat. al True a) False (a) ac resistance b) de resistance (c) a or b d) none of these 14.7 14.4 Premises Neutral Current Pat 7. To preven fires and electric shock, the NEC specifies that neutral current can flow on metal parts of the electrical system (a) True b) False 182 Mike Holt's Illustrated Guide to Basic Electrical Theory