Electrical Engineering Flashcards
6 cards from real BE/B Eng Bachelor of Engineering practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Electrical Engineering flashcards as text
Which of the following best describes an op-amp in an inverting configuration?
Answer: The output is 180 degrees out of phase with the input
In an inverting op-amp configuration, the output signal is amplified and phase-shifted by 180 degrees relative to the input signal.
What is the primary purpose of a snubber circuit in power electronics?
Answer: To limit voltage and current transients across switching devices
Snubber circuits suppress voltage spikes and reduce dv/dt across power switches like IGBTs and thyristors, protecting them from damage.
In digital circuits, what is the purpose of a flip-flop?
Answer: To store one bit of data
A flip-flop is a bistable memory element that stores a single binary bit and changes state based on clock and input signals.
Which modulation technique is used in WiFi (IEEE 802.11) for high-data-rate transmission?
Answer: OFDM (Orthogonal Frequency Division Multiplexing)
Modern WiFi standards use OFDM, which splits data across many closely spaced orthogonal subcarriers to achieve high throughput and robustness against multipath interference.
What does PID stand for in control systems?
Answer: Proportional-Integral-Derivative
A PID controller combines proportional, integral, and derivative terms to minimize error and achieve stable, accurate control of a system.
In electrical machines, what is slip in an induction motor?
Answer: The difference between synchronous speed and rotor speed, expressed as a fraction of synchronous speed
Slip (s) = (Ns - Nr) / Ns, where Ns is synchronous speed and Nr is rotor speed; it quantifies how much the rotor lags behind the rotating magnetic field.