IEC YEAR 1 FINAL EXAM STUDY WITH ANSWERS

IEC YEAR 1 FINAL EXAM STUDY WITH ANSWERS
What is the result if the neutral wire becomes open on a multiwire circuit having unequal
loads?


Select one:


a.
The load of higher resistance would overheat and probably be damaged.


b.
The load of lesser resistance would overheat and probably be damaged.


c.
No effect until one load is turned off or opens.


d.

No effect. - - The load of higher resistance would overheat and probably be
damaged.
Refer to Figure 128.202. ___ volts are applied across the water heater element.
Select one:


a.
120


b.
240


c.
0

,IEC YEAR 1 FINAL EXAM STUDY WITH ANSWERS

d.

480 - - 240

Circuits 7 and 9 share a neutral. This is a multiwire branch circuit. If Ckt. 7 is drawing 13
amps and Ckt. 9 is drawing 16 amps, how much current is flowing in the neutral?


Select one:


a.
3


b.
13


c.
29


d.

16 - -3
The Code reference that specifies the type of disconnecting means (circuit breaker for
example) that can be used on a multiwire branch circuit that feeds devices mounted on the
same yoke [a stack switch or a duplex receptacle for example] is ___.
Note: Select N/A (not applicable) if there is not an NEC® requirement.


Select one:


a.
Article 100

,IEC YEAR 1 FINAL EXAM STUDY WITH ANSWERS

b.
240.15(B)(1)


c.
404.8(A)


d.

N/A - - 240.15(B)(1)
Voltmeters are connected in ___ with the load when used to measure voltage across a load
in a circuit.


Select one:


a.
parallel


b.

series - - Parallel
The neutral has been broken in the circuit shown in Figure 128.418. The current through
Lamp F (IF) with the neutral opened is ___ amps.
Select one:


a.
6


b.

, IEC YEAR 1 FINAL EXAM STUDY WITH ANSWERS
1


c.
2


d.
8


e.

3- -1

Refer to Figure 128.523. Each battery puts out 12 volts. The voltage applied to the load is
___ volts.


Select one:


a.
48


b.
0


c.
24


d.
36