Antenna and Microwave Engineering MCQs with answers Page - 10

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A

Admin • 802.91K Points
Coach

Q. GaAs is used in the fabrication of GUNN diodes because:

  • (A) gaas is cost effective
  • (B) it less temperature sensitive
  • (C) it has low conduction band electrons
  • (D) less forbidden energy gap

A

Admin • 802.91K Points
Coach

Q. In a GaAs n-type specimen, the current generated is constant irrespective of the electric filed applied to the specimen.

  • (A) true
  • (B) false
  • (C) ---
  • (D) ---

A

Admin • 802.91K Points
Coach

Q. When the electric field applied to GaAs specimen is less than the threshold electric field, the current in the material:

  • (A) increases linearly
  • (B) decreases linearly
  • (C) increases exponentially
  • (D) decreases exponentially

A

Admin • 802.91K Points
Coach

Q. GaAs is used in fabricating Gunn diode. Gunn diode is:

  • (A) bulk device
  • (B) sliced device
  • (C) made of different type of semiconductor layers
  • (D) none of the mentioned

A

Admin • 802.91K Points
Coach

Q. The electrodes of a Gunn diode are made of:

  • (A) molybdenum
  • (B) gaas
  • (C) gold
  • (D) copper

A

Admin • 802.91K Points
Coach

Q. When either a voltage or current is applied to the terminals of bulk solid state compound GaAs, a differential is developed in that bulk device.

  • (A) negative resistance
  • (B) positive resistance
  • (C) negative voltage
  • (D) none of the mentioned

A

Admin • 802.91K Points
Coach

Q. The number of modes of operation for n type GaAs is:

  • (A) two
  • (B) three
  • (C) four
  • (D) five

A

Admin • 802.91K Points
Coach

Q. The free electron concentration in N-type GaAs is controlled by:

  • (A) effective doping
  • (B) bias voltage
  • (C) drive current
  • (D) none of the mentioned

A

Admin • 802.91K Points
Coach

Q. The modes of operation of a Gunn diode are illustrated in a plot of voltage applied to the Gunn diode v/s frequency of operation of Gunn diode.

  • (A) true
  • (B) false
  • (C) ---
  • (D) ---

A

Admin • 802.91K Points
Coach

Q. The mode of operation in which the Gunn diode is not stable is:

  • (A) gunn oscillation mode
  • (B) limited space charge accumulation mode
  • (C) stable amplification mode
  • (D) bias circuit oscillation mode

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