Pre-Training Assessment : Prac Troublestg-Elec Equ&Cntrl Circuits - AETC أفق الإبداع

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الرئيسية
خطة 2024
CACHE
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Pre-Training Assessment : Prac Troublestg-Elec Equ&Cntrl Circuits

Name: *

:Polarization index PI equals *

PI=R10/R1
PI=I10/I1
P=V1/V10
PI=R1/R10

:Polarization index PI greater than 4, so the insulation evaluation *

Poor
Dangerous
Fair
Excellent

:Polarization index PI test by applying *

DC voltage
AC voltage
Both & b

:Distribution transformers are utilized in distribution networks with significantly higher voltage *

True
False

:Polarization index obtained by taking the ratio of the *

10-minute to 1-minute insulation resistance readings
9-minute to 1-minute insulation resistance readings
8-minute to 1-minute insulation resistance readings

:The reason of fault in the system may be due to *

a worn out bearing of a motor.
A tree falling or touching an overhead line
A lightning strike
All above

:A fuse is normally a… *

current limiting device
voltage limiting device
power limiting device
power factor correcting device

:The function of the current transformer is to __________ *

convert the current from AC to DC
step up the line current
step down the line voltage
none of the above

:A surge involves a high magnitude _______________ spike superimposed on a sine wave *

Current
Voltage
Power
Ferquency