Basics of transmission lines MCQs

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  1. A transmission line is used to:
    A. Amplify electrical signals
    B. Transmit electrical power or signals between two locations
    C. Store electrical energy
    D. Convert analog signals to digital signals

    Answer: B

  2. Which of the following is an example of a transmission line?
    A. Coaxial cable
    B. Optical fiber
    C. Twisted pair cable
    D. All of the above

    Answer: D

  3. The primary purpose of a transmission line is to:
    A. Match impedance
    B. Deliver signals with minimal loss
    C. Increase bandwidth
    D. Suppress noise

    Answer: B

  4. Which parameter represents the opposition to current flow in a transmission line?
    A. Inductance
    B. Capacitance
    C. Resistance
    D. Conductance

    Answer: C

  5. What does the characteristic impedance (Z0Z_0) of a transmission line depend on?
    A. Resistance and conductance
    B. Inductance and capacitance per unit length
    C. Voltage and current
    D. Frequency and wavelength

    Answer: B

  6. What is the unit of characteristic impedance?
    A. Ohm
    B. Farad
    C. Henry
    D. Siemens

    Answer: A

  7. For a lossless transmission line, the characteristic impedance is given by:
    A. RG\sqrt{\frac{R}{G}}
    B. LC\sqrt{\frac{L}{C}}
    C. RC\sqrt{RC}
    D. GL\sqrt{\frac{G}{L}}

    Answer: B

  8. The velocity of propagation in a transmission line is given by:
    A. v=1LCv = \frac{1}{\sqrt{LC}}
    B. v=LCv = \sqrt{LC}
    C. v=1RCv = \frac{1}{RC}
    D. v=LCv = \sqrt{\frac{L}{C}}

    Answer: A

  9. Standing waves are formed in a transmission line when:
    A. Impedance is matched
    B. There is a reflection due to impedance mismatch
    C. Power is transmitted efficiently
    D. The frequency of the source matches the load

    Answer: B

  10. The standing wave ratio (SWR) is a measure of:
    A. Signal strength
    B. Power loss
    C. Impedance matching
    D. Frequency response

    Answer: C

  11. Which of the following is NOT a type of transmission line?
    A. Coaxial cable
    B. Microstrip line
    C. Parallel plate line
    D. Rectifier line

    Answer: D

  12. Twisted pair cables are commonly used for:
    A. Satellite communication
    B. Telephone and Ethernet networks
    C. High-power transmission
    D. Audio frequency signals

    Answer: B

  13. Which type of transmission line is best suited for high-frequency applications?
    A. Coaxial cable
    B. Open wire line
    C. Twisted pair cable
    D. Waveguide

    Answer: D

  14. The primary causes of power loss in a transmission line are:
    A. Reflections and harmonics
    B. Resistance of conductors and dielectric losses
    C. Impedance matching and phase shift
    D. Capacitance and inductance

    Answer: B

  15. What is the term for power loss due to electromagnetic radiation from a transmission line?
    A. Dielectric loss
    B. Copper loss
    C. Radiation loss
    D. Standing wave loss

    Answer: C

  16. Impedance matching is important in transmission lines to:
    A. Minimize reflections and maximize power transfer
    B. Reduce the frequency of the signal
    C. Increase the signal voltage
    D. Eliminate standing waves

    Answer: A

  17. A quarter-wave transformer is used to:
    A. Match two different impedances
    B. Increase the bandwidth
    C. Eliminate noise in a transmission line
    D. Reduce the attenuation of a signal

    Answer: A

  18. In a transmission line, a Smith chart is used to:
    A. Plot the gain of the system
    B. Analyze impedance and reflection coefficients
    C. Measure voltage standing wave ratio (VSWR)
    D. Calculate the attenuation constant

    Answer: B

  19. A lossless transmission line has:
    A. Zero resistance and conductance
    B. Zero inductance and capacitance
    C. Maximum attenuation
    D. Infinite reflection coefficient

    Answer: A

  20. The term “cutoff frequency” in a waveguide or transmission line refers to:
    A. The maximum frequency that can propagate
    B. The minimum frequency below which no propagation occurs
    C. The frequency at which reflections are minimized
    D. The frequency at which impedance is zero

    Answer: B

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