NYC ELECTRICIAN EXAM
1. What wire has the highest resistance?
*Answer* Chromium
2. Z- Impedance
*Answer* The total opposition to an AC circuit, combining all resitances Z=
square root of R^2 + (XL- XC)^2
3. True Power
*Answer* Total power of circuit in Watts
P(true)= P(App.) x PF
4. Oil is used in many large transformers to?
*Answer* To insulate the coils
5. Apparent Power
*Answer* Starting power P(App) = E
x I (Volt Amperes)
6. Power Factor
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, *Answer* P(True) / P(App) OR PF=R/Z
7. Xc= Capacitive Reactance
*Answer* Xc= 1/ (2)(π)(F)(C) OR 159,000/ (f x μfd)
8. Xl= inductive reactance
*Answer* Xl= (2)(π)(F)(L)
9. Circuit breakers used for switching shall be marked
*Answer* SWD or HID
10. An insulated wire shall have its AWG marking every feet
*Answer* Two
11. The cold resistance is than the hot resistance.
*Answer* Less than
12. Celsius to Fahrenheit
*Answer* F = 9/5C + 32
13. Wire Temp. Abbreviations
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, *Answer* No H = 60° C
1 H = 75°C
2 H= 90°
14. Voltage is to the # of turns
*Answer* Proportional
15. To select the proper fuse, it is necessary to know the...
*Answer* voltage and amperage
16. When under ordinary conditions, device boxes for concealed work shall
have a depth of not less than...
*Answer* 1/2"
17. The largest size conductor that may be used in under floor raceway is...
*Answer* that for which it is designed for
18. A 277V light circuit may not be used to supply...
*Answer* A standard medium base
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1. What wire has the highest resistance?
*Answer* Chromium
2. Z- Impedance
*Answer* The total opposition to an AC circuit, combining all resitances Z=
square root of R^2 + (XL- XC)^2
3. True Power
*Answer* Total power of circuit in Watts
P(true)= P(App.) x PF
4. Oil is used in many large transformers to?
*Answer* To insulate the coils
5. Apparent Power
*Answer* Starting power P(App) = E
x I (Volt Amperes)
6. Power Factor
1/
27
, *Answer* P(True) / P(App) OR PF=R/Z
7. Xc= Capacitive Reactance
*Answer* Xc= 1/ (2)(π)(F)(C) OR 159,000/ (f x μfd)
8. Xl= inductive reactance
*Answer* Xl= (2)(π)(F)(L)
9. Circuit breakers used for switching shall be marked
*Answer* SWD or HID
10. An insulated wire shall have its AWG marking every feet
*Answer* Two
11. The cold resistance is than the hot resistance.
*Answer* Less than
12. Celsius to Fahrenheit
*Answer* F = 9/5C + 32
13. Wire Temp. Abbreviations
2/
27
, *Answer* No H = 60° C
1 H = 75°C
2 H= 90°
14. Voltage is to the # of turns
*Answer* Proportional
15. To select the proper fuse, it is necessary to know the...
*Answer* voltage and amperage
16. When under ordinary conditions, device boxes for concealed work shall
have a depth of not less than...
*Answer* 1/2"
17. The largest size conductor that may be used in under floor raceway is...
*Answer* that for which it is designed for
18. A 277V light circuit may not be used to supply...
*Answer* A standard medium base
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