ETC Electrical Systems & Instrumentation Flashcards
6 cards from real ETC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 ETC Electrical Systems & Instrumentation flashcards as text
What is the function of a rectifier in an electrical system?
Answer: Converts AC to DC
A rectifier converts alternating current (AC) into direct current (DC) using diodes or thyristors.
Which grounding method directly connects the neutral point of a transformer to earth?
Answer: Solid grounding
Solid grounding directly connects the neutral to earth, providing a low-impedance fault path for safety.
What is the purpose of a power factor correction capacitor bank?
Answer: To reduce reactive power demand and improve power factor
Capacitor banks supply reactive power locally, reducing the reactive current drawn from the utility and improving power factor.
What does IP65 rating indicate for electrical enclosures?
Answer: Dust-tight and protected against water jets
IP65 means the enclosure is completely dust-tight (6) and protected against low-pressure water jets from any direction (5).
Which device is used to measure the insulation resistance of electrical cables?
Answer: Megohmmeter
A megohmmeter applies high DC voltage to measure insulation resistance, typically in megaohms, to assess cable integrity.
What is the purpose of a Variable Frequency Drive (VFD) in motor control?
Answer: To control motor speed by varying supply frequency and voltage
A VFD adjusts the frequency and voltage supplied to a motor, allowing precise speed control and energy savings.