Adaptive Array MCQ

Test your knowledge with important Adaptive Array MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Adaptive Array MCQs at Bissoy

• In Chebyshev array which of the following is approximated to the Chebyshev polynomial?
  ক

  Array factor

  খ

  HPBW

  গ

  Side lobe level

  ঘ

  Range equation
• What is the HPBW of the Dolph Chebyshev array if the broadening factor is 2 and HPBW of uniform array is 30°?
  ক

  30°

  খ

  60°

  গ

  90°

  ঘ

  120°
• Which of the following represents the chebyshev recursive formula?
  ক

  Tm(z) = 2zTm-1(z) – Tm-2(z)

  খ

  Tm(z) = zTm-1(z) – 2Tm-2(z)

  গ

  Tm(z) = 2Tm-1(z) – zTm-2(z)

  ঘ

  Tm(z) = Tm-1(z) – 2zTm-2(z)
• What should be the side lobe level to make Dolph Chebyshev to binomial array?
  ক

  -∞ dB

  খ

  0 dB

  গ

  1 dB

  ঘ

  10dB
• Dolph pattern uses which of the following polynomial approximation?
  ক

  Chebyshev

  খ

  Binomial

  গ

  Pascal’s

  ঘ

  Taylor
• Which of the following a method proposed to design array with any side lobes?
  ক

  Dolph-Chebyshev

  খ

  Binomial array

  গ

  Taylor

  ঘ

  Broad-side Array
• As the order of the polynomial increases, the slope becomes steeper.
  ক

  True

  খ

  False
• All the nulls occur at (-1, 1) in the Chebyshev polynomial.
  ক

  True

  খ

  False
• All the polynomials of the order m pass through the point ____________
  ক

  (1, 1)

  খ

  (0, 0)

  গ

  (0, 1)

  ঘ

  (-1, 0)
• Which of the following properties of Chebyshev polynomial is false?
  ক

  The minor lobes have unequal amplitudes

  খ

  The polynomial Tm(x) is symmetric for m = even

  গ

  The polynomial Tm(x) crosses the x axis m times between -1 and 1

  ঘ

  Minor lobes exists for |x| < 1
• Which of the following statements regarding Chebyshev polynomial is true?
  ক

  The polynomial Tm(x) is symmetric for m = even

  খ

  The polynomial Tm(x) is symmetric for m = odd

  গ

  The polynomial Tm(x) is anti-symmetric for m = even

  ঘ

  The polynomial Tm(x) is symmetric for m = even and odd
• The condition for the existence of the main lobe according to the Chebyshev is _________
  ক

  |x| > 1

  খ

  |x| < 1

  গ

  |x| = 0

  ঘ

  2|x| > 1
• What is the possible level from the following for the minor lobe when the main beam level is at 50db and SLL at 10 db according to Chebyshev?
  ক

  40dB

  খ

  45dB

  গ

  50dB

  ঘ

  80dB
• Which of the following statements is true? b) The polynomials are marginally stable at interval c) The polynomial doesn’t oscillate at interval d) The polynomials crosses the axis m-1 times at
  ক

  The polynomials are unstable at interval

  খ

  -1, 1

  গ

  -1, 1

  ঘ

  -1, 1
• How many times the polynomial T5(x) crosses the x-axis between ?
  ক

  ? ] 5

  খ

  -1, 1

  গ

  -1, 1

  ঘ

  -1, 1
• Which of the following statement is true about the Chebyshev function Tm(x)?
  ক

  It is a continuously increasing function after x=1

  খ

  It is a continuously decreasing function after x=1

  গ

  It is a continuously increasing function after x=0

  ঘ

  It is a continuously decreasing function after x=0
• The value of Tm(z) in the range between -1 to 1 is ____
  ক

  -1 to 1

  খ

  1

  গ

  0

  ঘ

  0 to infinity
• The value of Tm(-1)=_______
  ক

  (-1)m

  খ

  (-1)m-1

  গ

  (-1)m/2

  ঘ

  (-1)2m
• The value of T0(100) is _____
  ক

  1

  খ

  100

  গ

  10000

  ঘ

  200
• What is the value of Tm (0) when m is an even number?
  ক

  0

  খ

  (-1)m

  গ

  -1

  ঘ

  (-1)m/2
• The value of Tm(0) for every odd value of m is _____________
  ক

  0

  খ

  1

  গ

  -1

  ঘ

  m
• The recurrence relation for the Chebyshev polynomial is __________
  ক

  Tm(z) = 2zTm-1(z) – Tm-2(z)

  খ

  Tm (z) = Tm-1(z) – 2zTm-2(z)

  গ

  Tm(z) = 2zTm(z) – Tm-2(z)

  ঘ

  Tm(z) = 2zTm(z) – Tm-1(z)
• Which of the following is holds true for the Chebyshev polynomial?
  ক

  Tm(-x) = (-1)m Tm(x)

  খ

  Tm(-x) = (-1)m Tm-1(1/x)

  গ

  Tm(x) = (-1)m Tm(1/x)

  ঘ

  Tm(-x) = (-1)m Tm-1(x)
• _____________ is used to obtain array with any desired side lobe level.
  ক

  Chebyshev

  খ

  Schelkunoff

  গ

  Woodward-Lawson

  ঘ

  Binomial
• In Chebyshev array, its array factor is approximated to Chebyshev polynomial.
  ক

  True

  খ

  False
• Which of the following is the key feature of the Chebyshev array?
  ক

  Have constant side lobes and elements are placed uniformly

  খ

  Have varying side lobes and elements are placed uniformly

  গ

  Minor lobes are present at |x| > 1

  ঘ

  Major lobes are present at |x| < 1
• Which of the following method is used for antenna design with no side lobes?
  ক

  Binomial array

  খ

  Dolph Chebyshev

  গ

  Schelkunoff

  ঘ

  Woodward
• Which of the following is not a technique of antenna synthesis?
  ক

  Woodward

  খ

  Schelkunoff

  গ

  Fourier

  ঘ

  Thinning
• Antenna synthesis is analogous to _____
  ক

  Antenna array

  খ

  Antenna analysis

  গ

  Antenna radiation

  ঘ

  Schelkunoff synthesis
• Which of the following synthesis method have a constant inner minor lobe level and remaining one decreasing gradually?
  ক

  Woodward

  খ

  Schelkunoff

  গ

  Fourier

  ঘ

  Taylor