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MCQs

Total Questions : 660 | Page 1 of 66 pages
Question 1.

The modes in a rectangular waveguide are denoted by TMmn/TEmn where m and n are the eigen numbers along the larger and smaller dimensions of the waveguide respectively. Which one of the following statements is TRUE?


  1.    The TM10 mode of the waveguide does not exist
  2.    The TE10 mode of the waveguide does not exist
  3.    The TM10 and the TE10 modes both exist and have the same cut-off frequencies
  4.    The TM10 and the TM01 modes both exist and have the same cut-off frequencies
 Discuss Question
Answer: Option A. -> The TM10 mode of the waveguide does not exist



Question 2. The dimension of flux density is
  1.    MT¯¹Q¯¹
  2.    MT¯²
  3.    MT¹Q¹
  4.    MT¯¹Q¯²
 Discuss Question
Answer: Option A. -> MT¯¹Q¯¹
Answer: (a).MT¯¹Q¯¹
Question 3. For TE or TM modes of propagation in bounded media, the phase velocity is
  1.    independent of frequency
  2.    is a linear function of frequency
  3.    is a non-linear function of frequency
  4.    can be frequency dependent or frequency independent on the source
 Discuss Question
Answer: Option C. -> is a non-linear function of frequency
Answer: (c).is a non-linear function of frequency
Question 4. Intrinsic or characteristic impedance of free space has a value of
  1.    120 ohm
  2.    73 ohm
  3.    73 ε ohm
  4.    120 ε ohm
 Discuss Question
Answer: Option D. -> 120 ε ohm
Answer: (d).120 ε ohm
Question 5. Which one is not correct for folded dipole antenna?
  1.    High I/P impedance
  2.    Low I/P impedance
  3.    High bandwidth
  4.    Used as reactance compensation network
 Discuss Question
Answer: Option B. -> Low I/P impedance
Answer: (b).Low I/P impedance
Question 6. Frequencies in the UHF range propagate by means of
  1.    space wave
  2.    surface waves
  3.    sky waves
  4.    ground waves
 Discuss Question
Answer: Option A. -> space wave
Answer: (a).space wave
Question 7. In waveguide Degenerate modes are
  1.    two mode having same cut off frequency
  2.    two mode having same power
  3.    two mode having same phase velocity
  4.    it is a hypothetical mode
 Discuss Question
Answer: Option A. -> two mode having same cut off frequency
Answer: (a).two mode having same cut off frequency
Question 8. Radiowaves are electromagnetic waves having frequency range
  1.    0.001 to 50 H
  2.    0.001 to 50 kHz
  3.    0.002 to 50 MHz
  4.    0.001 to 10¹⁶ Hz
 Discuss Question
Answer: Option D. -> 0.001 to 10¹⁶ Hz
Answer: (d).0.001 to 10¹⁶ Hz
Question 9. An antenna is considered to be in free space where its height above the ground is
  1.    λ
  2.    2λ
  3.    less than 3λ
  4.    more than 5λ
 Discuss Question
Answer: Option D. -> more than 5λ
Answer: (d).more than 5λ
Question 10. When a line of any odd multiple of a quarter wavelength is short-circuited it represents
  1.    unit impedance
  2.    infinite impedance
  3.    zero impedance
  4.    none of the above
 Discuss Question
Answer: Option B. -> infinite impedance
Answer: (b).infinite impedance

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