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 does the term 'voltage drop' refer to in an electrical circuit?
Answer: Reduction in voltage across a component due to resistance
Voltage drop is the reduction in electrical potential across a passive element caused by resistance in the circuit.
Which instrument is used to measure electrical resistance in a circuit?
Answer: Ohmmeter
An ohmmeter is specifically designed to measure electrical resistance in ohms.
What is the purpose of a circuit breaker in an electrical panel?
Answer: To protect wiring from overcurrent by interrupting the circuit
A circuit breaker automatically interrupts current flow when it exceeds safe levels, protecting wiring and equipment from damage.
In a three-phase power system, what is the phase angle difference between each phase?
Answer: 120 degrees
In a balanced three-phase system, each phase is separated by 120 degrees to evenly distribute power.
Which type of sensor converts physical displacement into an electrical signal?
Answer: LVDT (Linear Variable Differential Transformer)
An LVDT converts linear mechanical displacement into a proportional electrical voltage output.
What does a 4-20 mA signal represent in industrial instrumentation?
Answer: A standard analog current loop used to transmit process variable data
The 4-20 mA current loop is the industrial standard analog signal where 4 mA represents the minimum range and 20 mA the maximum.