Practice Test Geeks(EETC) Electrical Technician Certification Practice Test
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Circuit Design & Troubleshooting Flashcards

7 cards from real EETC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Circuit Design & Troubleshooting flashcards as text

  1. What is the primary advantage of using a differential pair (long-tailed pair) in amplifier design?

    Answer: Rejection of common-mode signals while amplifying differential signals

    A differential pair amplifies the voltage difference between two inputs while rejecting signals common to both, providing high common-mode rejection ratio (CMRR).

  2. A technician replaces a capacitor in an oscillator circuit with one of higher capacitance. What effect will this have on oscillation frequency?

    Answer: Frequency decreases

    In LC and RC oscillators, frequency is inversely proportional to capacitance (f = 1/(2π√LC) or f = 1/(2πRC)); larger C lowers frequency.

  3. In a three-phase power system, what is the phase angle between each of the three voltage waveforms?

    Answer: 120°

    In a balanced three-phase system, the three voltage waveforms are displaced from each other by 120° (360°/3 phases).

  4. When using the half-splitting troubleshooting method on a 16-stage circuit, what is the maximum number of tests needed to isolate a fault?

    Answer: 4

    Half-splitting (binary search) isolates a fault in log₂(N) steps; log₂(16) = 4 tests maximum for a 16-stage circuit.

  5. What does impedance matching between a source and load achieve in a circuit?

    Answer: Maximum power transfer from source to load

    Maximum power transfer occurs when the load impedance equals the complex conjugate of the source impedance, as stated by the maximum power transfer theorem.

  6. A clamp meter is measuring unusually low current in a motor circuit. Which condition would NOT cause this reading?

    Answer: The power factor of the motor is very high

    A high power factor does not cause low current readings; it means current and voltage are in phase, which is desirable and normal.

  7. In digital circuit design, what is the purpose of a pull-up resistor on an open-collector output?

    Answer: To pull the output line to a defined high logic level when the transistor is off

    An open-collector output can only pull the line low; a pull-up resistor connects the line to Vcc, ensuring a defined HIGH state when the transistor is off.