Electrical Engineering Concepts Quiz
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Questions and Answers

What is the transfer function of the linear time-invariant system given the response y(t) = te^{-t} for t ≥ 0?

  • \frac{1}{(s + 1)^{2}} (correct)
  • \frac{s}{(s + 1)^{2}}
  • \frac{1}{s^{2}}
  • \frac{1}{s(s + 1)^{2}}

    • Which characteristic differentiates the SCS from the SCR?

  • The SCS has a fourth terminal, called the anode gate. (correct)
  • SCS driven into cutoff use entirely different methods.
  • The SCS has fewer means of being forced into conduction.
  • All of the above.

    • What is the primary difference between the diac and the SCS?

  • SCS requires the use of a snubber.
  • Diac is no longer used in practical applications.
  • Diac has a higher maximum power dissipation rating.
  • SCS can conduct in only one direction. (correct)

    • For a closed-loop system, what is the correct expression for the transfer function \frac{E(s)}{R(s)}?

    <p>\frac{G}{1 + GH}</p> Signup and view all the answers

    What discrete-time signal is represented by x(n) for n ≥ 0 and x(n) = 0 for n < 0?

    <p>Unit step sequence</p> Signup and view all the answers

    Given the Fourier series coefficient of the signal x(t), what is the fundamental frequency of the signal if ω = 2π?

    <p>-22(cos 6πt - sin 2πt)</p> Signup and view all the answers

    What is the transformer turn ratio for a class A amplifier if it is specified as 4.5:1?

    <p>4.5:1</p> Signup and view all the answers

    What is the load resistance utilized in a transformer coupled class A amplifier if specified as 30 Ω?

    <p>30 Ω</p> Signup and view all the answers

    What is the voltage gain when the transistor is biased at a dc collector current of 0.5 mA?

    <p>-100</p> Signup and view all the answers

    What is the primary cause of linear distortion in amplifiers?

    <p>Reactances associated with the circuit and active amplifying element</p> Signup and view all the answers

    What is a characteristic of a relaxation oscillator?

    <p>Oscillates continuously</p> Signup and view all the answers

    What happens if the Barkhausen criterion is not fulfilled by an oscillator circuit?

    <p>It will stop oscillating</p> Signup and view all the answers

    For the given system to be invertible, what must G2(s) be?

    <p>$\frac{s}{1 + 2s + s^{2}}$</p> Signup and view all the answers

    What is the z transform of (n+1)^2?

    <p>$\frac{z^{2}(z + 1)}{{(z - 1)}^{3}}$</p> Signup and view all the answers

    What is the impedance of a coil with resistance 32 Ω and inductance 100 mH when an alternating voltage v = 100 sin 240t volts is applied?

    <p>50 ohms</p> Signup and view all the answers

    If ID = 4 mA at VGS = -2 V, what can be determined about IDSS if VP = -5 V?

    <p>It is less than I<del>D</del>.</p> Signup and view all the answers

    What should you consider when using 1-W resistors for a circuit that dissipates 1.05 W with a tolerance for a 20-percent resistance error?

    <p>Use a higher wattage resistor.</p> Signup and view all the answers

    What is the primary reason for making the coil span of a dc armature winding equal to a pole pitch?

    <p>To balance the magnetic field</p> Signup and view all the answers

    What type of logic gate has an output of 1 when all inputs are at logic 0?

    <p>NAND</p> Signup and view all the answers

    What does non-volatile memory refer to?

    <p>Memory that retains data when power is removed</p> Signup and view all the answers

    If the input voltage of a circuit is 80 μV, what are the possible output voltages with the given resistor values?

    <p>-3.05 V</p> Signup and view all the answers

    What primarily influences the size of transient current in an R-L circuit with alternating voltage?

    <p>Time of circuit closure</p> Signup and view all the answers

    In a voltage regulator circuit, if load resistance decreases and load voltage changes, what is the percent load regulation?

    <p>5.5%</p> Signup and view all the answers

    What is the design value for Rf in the given circuit?

    <p>282 kΩ</p> Signup and view all the answers

    What occurs to a thyristor's turn-off time as its temperature increases from 50°C to 100°C?

    <p>It increases</p> Signup and view all the answers

    If a voltage regulator outputs 12 V at no load, what happens when the load decreases from 10 ohms to 7.5 ohms?

    <p>Load voltage drops</p> Signup and view all the answers

    What is the maximum dissipation allowed for a 90-W silicon transistor at a case temperature of 145°C?

    <p>42 W</p> Signup and view all the answers

    What is the input impedance of a Darlington transistor with a Beta of 8000 and RE = 1 kohm?

    <p>8 kohm</p> Signup and view all the answers

    What is the time required for a capacitor voltage to reach 63.2% of its steady-state value in an RC circuit with R = 2Ω and C = 4F?

    <p>2 s</p> Signup and view all the answers

    What is the maximum power that a silicon transistor can dissipate into free air at an ambient temperature of 80°C with TJmax = 200°C?

    <p>3 W</p> Signup and view all the answers

    What is the maximum collector current (ICSAT) for a given circuit?

    <p>4 A</p> Signup and view all the answers

    Study Notes

    DC Power Supply Behavior

    • Output voltage of a DC power supply decreases when current is drawn due to internal resistance and voltage drop.

    Relaxation Oscillators

    • A relaxation oscillator possesses two stable states.
    • It generates non-sinusoidal outputs.
    • It oscillates continuously.

    Barkhausen Criterion

    • If the Barkhausen criterion is not met in an oscillator circuit, it will stop oscillating.
    • The result may involve producing damped waves.

    System Invertibility

    • For a system with components G₁(s) and G₂(s), G₂(s) must be given for the system to be invertible.
    • Potential candidates for G₂(s) include rational functions of s.

    Fourier Transform

    • The Fourier inverse of specific functions can reveal time-domain characteristics of signals.

    Z Transform Calculations

    • The z-transform for (n+1)² has various possible representations, affecting stability and response characteristics.

    AC Circuit Impedance

    • For a given AC voltage and characteristics of resistance and inductance, the circuit impedance can be calculated, influencing current flow.

    MOSFET Parameters

    • The drain current I_D and gate-source voltage V_GS can help determine the drain-source saturation current I_DSS.

    Resistor Power Dissipation

    • Power dissipation in resistors must be matched with available components while considering tolerance levels.

    Linear Time-Invariant Systems

    • Given system response to input can be modeled mathematically, yielding specific transfer functions.

    SCR and SCS Comparison

    • SCR differs from SCS due to the presence of a fourth terminal in SCS and methods of being forced into conduction.

    Logic Gates

    • A logic gate output of '1' with all inputs at '0' indicates a NOR or XNOR configuration.

    Non-volatile Memory

    • Refers to memory retaining data after power is lost, crucial for data integrity in electronics.

    Calculating Output Voltage

    • Output voltage from a resistor network can vary greatly based on input values and resistor configurations.

    Thyristor and Temperature Effects

    • Thyristor characteristics change with temperature, impacting its turn-off time.

    R-L Circuit Behavior

    • Transient currents in R-L circuits depend on the closing instant of the circuit relative to the AC voltage cycle.

    Voltage Regulation

    • Changes in load resistance significantly affect output voltage and current, revealing load regulation metrics.

    Amplifier Ratings

    • Amplifier power ratings and speaker impedance impact overall performance, differing based on gain and efficiency.

    Capacitor Time Constant

    • In an RC circuit, time required for a capacitor to reach a specific voltage percentage is tied to resistance and capacitance values.

    Silicon Transistor Ratings

    • Maximum power dissipation of silicon transistors is closely tied to temperature derating factors.

    D/A Converter Resolution

    • The resolution of a multi-stage D/A converter can be inferred from reference voltage and its bit depth.

    Circuit Gain Analysis

    • Gain in amplifiers and other circuits can be calculated based on component values and configurations.

    Current Calculations

    • Understanding current through components requires systematic circuit analysis and can yield various outcomes based on configurations.

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    ECE198-1 ELEX ans (1).docx

    Description

    Test your knowledge on key concepts in electrical engineering, including DC power supply behavior, relaxation oscillators, and the Fourier transform. This quiz covers various topics that are essential for understanding circuits and signal analysis.

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