11. Which of the following is used for its negative resistance characteristics ?
(a) Point contact diode
(b) GASFET
(c) Schottky diode
(d) Tunnel diode
12. Noise figure is used as figure of merit of :
(a) Oscillator
(b) Amplifier
(c) Moderator
(d) Isolator
13. An attenuator is used in TWT to :
(a) Prevent saturation
(b) Help bunching
(c) Prevent oscillations
(d) Increasing gain
14. The major source of thermal noise in a microwave system is :
(a) Waveguide feeder
(b) Receiver mixer
(c) TWT amplifier in transmitter
(d) FM demodulator
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