Cavity Resonators – Exercise – 1

1. A half-wavelength, close section of a waveguide that acts as a parallel resonant circuit is known as a(n) :

(a)  half-wave section
(b)  cavity resonator
(c)  directional coupler
(d)  LCR circuit

Answer
Answer : (b)
Explanation
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2. The cavity resonator :

(a)  is equivalent to an LC resonant circuit
(b)  in a reflect klystron has its output taken from the reflector plate
(c)  produces a frequency which is independent of the cavity size
(d)  has a low Q factor for narrow operation

Answer
Answer : (a)
Explanation
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3. The reflex klystron is often preferred to the two cavity klystron oscillator because the former :

(a)  Is more efficient
(b)  Has higher number of modes
(c)  Is easier to tune
(d)  Produces a higher output power

Answer
Answer : (c)
Explanation
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4. Which of the following is not an application of microwave cavities :

(a)  Band pass filter
(b)  Band stop filter
(c)  Oscillator frequency control
(d)  Detector

Answer
Answer : (d)
Explanation
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5. Which microwave tube uses for buncher and catcher cavities ?

(a)  Magnetron
(b)  Klystron
(c)  Reflex Klystron
(d)  Travelling-wave-tube

Answer
Answer : (b)
Explanation
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6. Strapping is used in cavity magnetron to :

(a)  Ensure bunching
(b)  Prevent cathode-back heating
(c)  Both a and b
(d)  Prevent mode jumping

Answer
Answer : (d)
Explanation
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