Smith Chart MCQ

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• The centre and radius of a line with normalised load impedance of 1 + 0.5j is
  ক

  (1,2) and 2

  খ

  (2,1) and 2

  গ

  (1,2) and 1

  ঘ

  (2,1) and 1
• The best stub selection for the transmission line will be
  ক

  Series open

  খ

  Series short

  গ

  Shunt open

  ঘ

  Shunt short
• The radius of the point having a normalised resistance of 1 ohm is
  ক

  1

  খ

  0.2

  গ

  0.5

  ঘ

  0.25
• The normalised load impedance of the transmission line 50 ohm with a load of 30 ohm is
  ক

  30

  খ

  150

  গ

  5/3

  ঘ

  3/5
• The centre of the point having a normalised resistance of 1.2 ohm and reactance of 1.5 ohm is
  ক

  (0.54,0)

  খ

  (0.45,0)

  গ

  (0.36,0)

  ঘ

  (0.78,0)
• Moving towards the clockwise direction in the Smith chart implies moving
  ক

  Towards generator

  খ

  Towards load

  গ

  Towards stub

  ঘ

  Towards waveguide
• The circles in the Smith chart pass through which point?
  ক

  (0,1)

  খ

  (0,-1)

  গ

  (-1,0)

  ঘ

  (1,0)
• The Smith chart consists of the
  ক

  Constant R and variable X circles

  খ

  Variable R and constant X circles

  গ

  Constant R and constant X circles

  ঘ

  Variable R and variable X circles
• The Smith chart is graphical technique used in the scenario of transmission lines. State true/false.
  ক

  True

  খ

  False
• The Smith chart is a polar chart which plots
  ক

  R vs Z

  খ

  R vs Znorm

  গ

  T vs Z

  ঘ

  T vs Znorm
• To get an admittance chart from an impedance chart:
  ক

  Smith chart has to be rotated by 90⁰

  খ

  Smith chart has to be rotated by 180⁰

  গ

  Admittance chart cannot be obtained from the impedance chart anyway.

  ঘ

  None of the mentioned
• If the normalized load impedance of a transmission line is 0.3-j0.4 with a characteristic impedance of 50 Ω, then the load impedance is:
  ক

  15-j20

  খ

  15+j20

  গ

  1-j

  ঘ

  0.3-0.4j
• If a transmission line of a characteristic impedance 100 Ω is terminated with a load impedance of 300+j200 Ω, then the normalized load impedance is:
  ক

  1+j

  খ

  1-j

  গ

  3+2j

  ঘ

  2-3j
• Normalized impedance of 1-j is:
  ক

  In the upper half of the impedance smith chart

  খ

  In the Lower half of the impedance smith chart

  গ

  On the outer most circle of the smith chart.

  ঘ

  On the horizontal line of the smith chart
• Normalized impedance of 0.3+j0.4 lies in the:
  ক

  Upper half of the impedance smith chart

  খ

  Lower half of the impedance smith chart

  গ

  Horizontal line of the chart

  ঘ

  None of the mentioned
• If the input impedance of a ƛ/2 transmission line is 100 Ω with a voltage reflection coefficient of 0.344, then the characteristic impedance of the transmission line is:
  ক

  200 Ω

  খ

  100 Ω

  গ

  50 Ω

  ঘ

  None of the mentioned
• If the normalized input impedance of a transmission line is 0.5 Ω, then he reflection coefficient of a ƛ/2 transmission line is
  ক

  0.3334

  খ

  0.5

  গ

  0.6667

  ঘ

  1
• If the characteristic impedance of a ƛ/2 transmission line is 50 Ω and reflection coefficient 0.3, then its input impedance
  ক

  26.92 Ω

  খ

  30 Ω

  গ

  40 Ω

  ঘ

  34.87 Ω
• Reflection coefficient of a transmission line in its polar form can be represented as:
  ক

  ┌=|┌|ejθ

  খ

  ┌=|┌|ejθ-1

  গ

  ┌=|┌|ejθ+1

  ঘ

  ┌=|┌|ejθ+α
• Any passively realizable reflection coefficient can be plotted as a unique point on the smith chart. This statement implies that:
  ক

  Reflection co-efficient less than or equal to 1 can be plotted

  খ

  Reflection co-efficient greater than or equal to 1 can be plotted

  গ

  Transmission co-efficient has to be less than or equal to one for the point to be located

  ঘ

  T=Г+1
• Smith chart is based on the polar plot of:
  ক

  Reactance

  খ

  Voltage

  গ

  Current

  ঘ

  Voltage reflection co-efficient