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الرئيسية
خطة 2024
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الرئيسية
خطة 2024
CACHE
- دبلومات CACHE
- مستويات دبلوم CACHE
البرامج التدريبية
من نحن
- تعرف علينا
- شركاء النجاح
تواصل معنا

Pre-assessment

Power Quality & Harmonics Training Course

:Full Name *

Q1- Harmonics are sinusoidal ___________ having frequencies that are integer multiples of the supply frequency (fundamental frequency)

a. Voltages
b. Currents
c. Voltages or currents
d. None of the above

Q2- DC offset is the presence of a dc ____________ in an ac power system is termed dc offset

a. Voltages
b. Currents
c. Voltages or currents
d. None of the above

Q3- Waveform distortion is defined as a steady-state deviation from an ideal sine wave of power frequency

a. Steady-state
b. Transient

Q4-A ____________ is a decrease in rms voltage or currentbetween 0.1 and 0.9 pu at the power frequency for durations from 0.5 cycle to 1 min

a. Sag
b. Swell
c. Interruption
d. None of the above

Q5-A swell is defined as an increase to between 1.1 and 1.8 pu in rms voltage or current at the power frequency for durations from 0.5 cycle to 1 min

a. Sag
b. Swell
c. Interruption
d. None of the above

Q6-An __________ occurs when the supply voltage or load current decreases to less than 0.1 pu for a period not exceeding 1 min

a. Sag
b. Swell
c. Interruption
d. None of the above

Q7-Active filter consists of a number of power electronic devices for eliminating harmonic distortion

a. False
b. True

Q8-Causes of harmonics: A ___________ load is any load which draws current which is not proportional to the voltage applied

a. Linear
b. Non-Linear

Q9- Power correction capacitors can cause ___________ resonance effects on a power system

a. Series
b. Parallel
c. Series and parallel
d. None of the above

Q10-Transients can be classified into two categories impulsive and oscillatory

a. False
b. True

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