Exam (elaborations)
IEC First Year Exam Study questions with correct answers.
IEC First Year Exam Study questions with correct answers.
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IEC First Year Exam Study questions
with correct answers
What |is |the |result |if |the |neutral |wire |becomes |open |on |a |multiwire |circuit |having
|unequal |loads? |- |correct |answers✔✔The |load |of |higher |resistance |would |overheat
|and |probably |be |damaged.
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
|___. |- |correct |answers✔✔240.15(B)(1)
Refer |to |the |panel |schedule |shown |in |Figure |128.231. |If |the |neutral |is |removed |from
|the |neutral |bar, |___ |volts |will |be |applied |to |the |TV. |- |correct |answers✔✔150
A |12/3 |cable |is |installed |from |a |120/240-V, |1Ø |panel |and |feeds |a |split-wired
|duplex |receptacle. |One |"hot" |is |connected |to |a |20A |breaker |in |panel |space |1. |The
|second |"hot" |is |connected |to |a |20A |breaker |in |space |3. |A |16-amp |load |is |connected
|to |the |upper |receptacle |and |a |14-amp |load |is |connected |to |the |lower |receptacle.
|Which |of |the |following |will |happen |if |the |neutral |is |removed |from |the |receptacle? |-
|correct |answers✔✔Because |a |higher |voltage |will |be |applied, |120-volt |equipment
|could |be |destroyed.
Refer |to |Figure |129.106. |With |the |equipment |energized |and |the |power |used |by |the
|element |connected |at |T3 |& |T4 |is |0.3kW, |the |power |used |by |the |equipment |(all |4
|elements) |___. |- |correct |answers✔✔is |1.2 |kW
- |correct |answers✔✔
|
A |short |length |of |EMT |is |run |between |two |panels. |The |ampacity |values |for |the
|conductors |in |this |EMT |need |not |be |derated, |as |long |as |the |length |of |the |EMT |does
|not |exceed |___. |- |correct |answers✔✔24 |in.
, An |extension |ladder |should |extend |___ |feet |above |the |top |of |the |building |and |be
|secured. |- |correct |answers✔✔3ft.
What |is |the |monthly |energy |cost |to |operate |a |250-watt |high-pressure |sodium |lamp?
|Electricity |costs |$0.15 |per |kW-hr |and |the |lamp |will |be |ON |for |8 |hours |per |day.
|There |are |30 |days |in |a |billing |month. |- |correct |answers✔✔$9.00
___ |can |be |described |as |the |point |of |demarcation |between |where |the |serving |utility
|ends |and |the |premises |wiring |begins. |- |correct |answers✔✔Service |Point
If |a |60-watt |lamp |operates |for |21 |hours, |the |utility |will |bill |for |___ |kWh. |- |correct
|answers✔✔1.260
To |minimize |conductor |insulation |damage |and |arcing |damage |to |electrical
|equipment |during |a |ground |fault |or |a |short |circuit, |___ |should |be |minimized. |-
|correct |answers✔✔a. |time |duration |of |the |fault
Article |___ |in |the |NEC |® |covers |grounding |and |bonding |of |electrical |systems. |-
|correct |answers✔✔250
Self-tapping |sheet |metal |screws |(TEK |screws) |___ |permitted |to |be |used |to |connect
|the |equipment |grounding |conductor |to |a |metal |box. |- |correct |answers✔✔are |not
For |a |100-Amp, |120/240-V, |3W |commercial |service, |___ |AWG |copper |THHN/THWN
|conductors |are |the |smallest |permitted |for |the |ungrounded |conductors. |- |correct
|answers✔✔3
Loads, |such |as |heating |and |air |conditioning, |that |do |not |operate |at |the |same |time
|are |said |to |be |noncoincident |loads. |While |separate |circuits |must |be |designed |to
|serve |each |load, |when |calculating |service |load |only |the |___ |of |two |noncoincident
|loads |needs |to |be |included. |- |correct |answers✔✔larger
Which |of |the |following |is |a |3/0 |AWG |conductor? |- |correct |answers✔✔000