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TRANSMISSION LINES

TRANSMISSION LINES
30問 • 2年前
  • Czy Gamat
    • 通報

    問題一覧

  • 1

    A system of conductors used to convey electric power or signal between two or more points

    Transmission lines

  • 2

    These conductors are uniformly spaced by insulators. They have low losses at low and medium frequencies and are economical to construct and maintained

    Open-wire transmission lines

  • 3

    To prevent radiation losses and interference from external sources, the inner conductor of this transmission line is completely enclosed with a metal sheath or braid

    Coaxial cables

  • 4

    The term “balance line” means that

    both answers are correct

  • 5

    The characteristic impedance of a transmission line is determined by:

    Its physical size and arrangement

  • 6

    The distributed parameters of the transmission line are: the series resistance; the series inductance; the shunt capacitance and the shunt conductance. What parameter was determined due to dielectric losses?

    Shunt conductance

  • 7

    Shunt capacitance was determined due to:

    Conductors were closed to each other

  • 8

    Series resistance was determined due to:

    The length and diameter of the conductors

  • 9

    At radio frequencies, a line is considered lossless because:

    both answer are correct

  • 10

    Determine the characteristic impedance of a transmission line which has a capacitance of 30pF/m and an inductance of 75nH/m

    50 Ω

  • 11

    The characteristic impedance of an open-wire balance line is determined from its physical structure. [ Zo = 276 log (2S/d) where S is the center-to-center distance of the conductors and d is the diameter of the conductor ]. At what condition is the characteristic impedance minimum?

    S = d

  • 12

    If a change in the dielectric material decreases the capacitance, the characteristic impedance is:

    Increased

  • 13

    All power applied at the input of the line will be absorbed by the load if:

    ZO > ZL

  • 14

    When ZL ≠ ZO, the power sent down the line toward the load is called the

    The incident power

  • 15

    When mismatch is great, this power actually cause damage to the transmitter or the line itself.

    The reflected power

  • 16

    A resultant wave due to the combination of incident and reflected wave

    Standing wave

  • 17

    If the load impedance matches the characteristic impedance of the line, there are _____ standing waves

    No

  • 18

    A measure of the mismatch between line and load impedance is called as

    Standing wave ratio

  • 19

    At matched condition, SWR is equal to

    One

  • 20

    The ratio of the reflected voltage to the incident voltage on the transmission line is termed as

    Reflection coefficient

  • 21

    A shorted or opened line will have a reflection coefficient of

    One

  • 22

    The minimum voltage along a transmission line is 260V, while the maximum voltage is 390V. The SWR is

    1.5

  • 23

    At UHF and microwave frequencies, transmission lines are commonly used as

    Resonant circuit

  • 24

    The time required for a wave to propagate on a transmission line will depend on the value of its

    Series inductance and shunt capacitance

  • 25

    The current (and voltage) distribution along a matched line vary _____ with distance

    Exponentially

  • 26

    a measure of how the voltage or current decreases with distance along the line

    Attenuation constant

  • 27

    The value remains constant for any length of wire

    Characteristic impedance

  • 28

    A measure of the difference in phase between the input and output current or voltage

    Phase constant

  • 29

    To match a 300Ω transmission line to a 100Ω load, the impedance of the quarter-wave transformer is

    173.21 Ω

  • 30

    An attenuation of 1 Neper is equal to _____ dB

    8.686

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    問題一覧

  • 1

    A system of conductors used to convey electric power or signal between two or more points

    Transmission lines

  • 2

    These conductors are uniformly spaced by insulators. They have low losses at low and medium frequencies and are economical to construct and maintained

    Open-wire transmission lines

  • 3

    To prevent radiation losses and interference from external sources, the inner conductor of this transmission line is completely enclosed with a metal sheath or braid

    Coaxial cables

  • 4

    The term “balance line” means that

    both answers are correct

  • 5

    The characteristic impedance of a transmission line is determined by:

    Its physical size and arrangement

  • 6

    The distributed parameters of the transmission line are: the series resistance; the series inductance; the shunt capacitance and the shunt conductance. What parameter was determined due to dielectric losses?

    Shunt conductance

  • 7

    Shunt capacitance was determined due to:

    Conductors were closed to each other

  • 8

    Series resistance was determined due to:

    The length and diameter of the conductors

  • 9

    At radio frequencies, a line is considered lossless because:

    both answer are correct

  • 10

    Determine the characteristic impedance of a transmission line which has a capacitance of 30pF/m and an inductance of 75nH/m

    50 Ω

  • 11

    The characteristic impedance of an open-wire balance line is determined from its physical structure. [ Zo = 276 log (2S/d) where S is the center-to-center distance of the conductors and d is the diameter of the conductor ]. At what condition is the characteristic impedance minimum?

    S = d

  • 12

    If a change in the dielectric material decreases the capacitance, the characteristic impedance is:

    Increased

  • 13

    All power applied at the input of the line will be absorbed by the load if:

    ZO > ZL

  • 14

    When ZL ≠ ZO, the power sent down the line toward the load is called the

    The incident power

  • 15

    When mismatch is great, this power actually cause damage to the transmitter or the line itself.

    The reflected power

  • 16

    A resultant wave due to the combination of incident and reflected wave

    Standing wave

  • 17

    If the load impedance matches the characteristic impedance of the line, there are _____ standing waves

    No

  • 18

    A measure of the mismatch between line and load impedance is called as

    Standing wave ratio

  • 19

    At matched condition, SWR is equal to

    One

  • 20

    The ratio of the reflected voltage to the incident voltage on the transmission line is termed as

    Reflection coefficient

  • 21

    A shorted or opened line will have a reflection coefficient of

    One

  • 22

    The minimum voltage along a transmission line is 260V, while the maximum voltage is 390V. The SWR is

    1.5

  • 23

    At UHF and microwave frequencies, transmission lines are commonly used as

    Resonant circuit

  • 24

    The time required for a wave to propagate on a transmission line will depend on the value of its

    Series inductance and shunt capacitance

  • 25

    The current (and voltage) distribution along a matched line vary _____ with distance

    Exponentially

  • 26

    a measure of how the voltage or current decreases with distance along the line

    Attenuation constant

  • 27

    The value remains constant for any length of wire

    Characteristic impedance

  • 28

    A measure of the difference in phase between the input and output current or voltage

    Phase constant

  • 29

    To match a 300Ω transmission line to a 100Ω load, the impedance of the quarter-wave transformer is

    173.21 Ω

  • 30

    An attenuation of 1 Neper is equal to _____ dB

    8.686