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Question 1
In a symmetrical three-phase AC system (Drehstromnetz) with a line-to-neutral phase voltage of 230 V (Strangspannung U_ph), what is the nominal line-to-line voltage (Leiterspannung U) between any two phase conductors?
Correct Answer:
400 V
Question 2
Which formula correctly calculates the total apparent power (Scheinleistung S) in a symmetrical three-phase AC network?
Correct Answer:
S = √3 × U × I
Question 3
What is the physical and economic consequence of operating an industrial facility with an uncompensated, low power factor (e.g., cos φ = 0.65 inductive)?
Correct Answer:
Line currents and I²R distribution losses increase, causing voltage drops and utility reactive energy penalty charges.
Question 4
An electrical installation draws an active power P = 50 kW at cos φ_1 = 0.70 (tan φ_1 = 1.020). What reactive power compensation capacity (Q_c) is required to improve the power factor to cos φ_2 = 0.95 (tan φ_2 = 0.329)?
Correct Answer:
34.6 kvar
Question 5
In an ideal single-phase transformer with primary voltage U_1, primary turns N_1, secondary turns N_2, and secondary voltage U_2, which equation defines the transformation ratio (Übersetzungsverhältnis ü)?
Correct Answer:
ü = U_1 / U_2 = N_1 / N_2 = I_2 / I_1
Question 1
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Prepare with the Befähigungsprüfung Elektrotechnik Practice Questions - Befähigungsprüfung für das reglementierte Gewerbe Elektrotechnik (Österreich) Exam practice quiz. This question bank includes 100 questions covering norm, three-phase, protection, voltage, and power. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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Befähigungsprüfung Elektrotechnik Practice Questions - Befähigungsprüfung für das reglementierte Gewerbe Elektrotechnik (Österreich) Exam

This practice set contains 100 questions from the matching question bank and focuses on norm, three-phase, protection, voltage, and power. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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