Problem 15 The above figure illustrates the current wiring of standard 120 VAC r
ID: 2085210 • Letter: P
Question
Problem 15 The above figure illustrates the current wiring of standard 120 VAC receptacles in the United States. Which of the following statements about the safety ground wire is false? Circuit Breaker Hot wire 120 Vms ( Neutral wire Safety ground wire Earth ground A) The safety ground wire is usually green in color B) Under normal (non-fault) conditions the current in the neutral wire is the same as the current in the safety ground wire C) Under normal (non-fault) conditions the voltage on the neutral wire is the same as the voltage on the safety ground wire D) A purpose of the safety ground wire is to keep metallic surfaces of electrical devices at earth ground potential E) A purpose of the safety ground wire is to trip the circuit breaker if the hot wire short- circuits to a metallic surfaceExplanation / Answer
For problem 15 option "b" is false,because safety ground wires are designed to carry current under fault conditions, while neutral acts as return path for normal current.
For problem 16,if 3+2j is referred to primary,it becomes (3+2j)/k^2;
Here k=n2/n1 =1/2=0.5
Z(A-A')=(3+2j)/0.5^2=4*(3+2j)
HenceZ(A-A')=12+8j ohm
Option "e" is correct