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MCQs

Total Questions : 148 | Page 9 of 15 pages
Question 81. By introducing which of the following, signal-to-noise ratio can be improved?
  1.    Small amplitude field modulation
  2.    Large amplitude field modulation
  3.    Small amplitude field attenuation
  4.    Large amplitude field attenuation
 Discuss Question
Answer: Option A. -> Small amplitude field modulation
Answer: (a).Small amplitude field modulation
Question 82. Microwaves reflected back from the cavity are routed to which of the following?
  1.    Attenuator
  2.    Klystron
  3.    Load
  4.    Diode detector
 Discuss Question
Answer: Option D. -> Diode detector
Answer: (d).Diode detector
Question 83. Which of the following routes are the microwaves entering from the klystron towards the cavity?
  1.    Oscillator
  2.    Attenuator
  3.    Circulator
  4.    Reflector
 Discuss Question
Answer: Option C. -> Circulator
Answer: (c).Circulator
Question 84. In basic ESR spectrometer, the cavity length is adjustable.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 85. Which of the following is adjusted as a fine control for frequency tuning?
  1.    Cathode
  2.    Anode
  3.    Reflector voltage
  4.    Grid
 Discuss Question
Answer: Option C. -> Reflector voltage
Answer: (c).Reflector voltage
Question 86. The cavity resonant frequency should be equal to which of the following?
  1.    Frequency of electric field
  2.    Klystron frequency
  3.    Frequency of magnetic field
  4.    Mechanical frequency
 Discuss Question
Answer: Option B. -> Klystron frequency
Answer: (b).Klystron frequency
Question 87. When klystron frequency is close to the cavity resonant frequency, much less power is reflected from the cavity to the diode.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 88. From which of the following are electrons emitted in the klystron tube?
  1.    Cathode
  2.    Anode
  3.    Grid
  4.    Reflector electrode
 Discuss Question
Answer: Option A. -> Cathode
Answer: (a).Cathode
Question 89. At which of the following frequencies is the magnetic field at the sample modulated?
  1.    1 kHz
  2.    10 kHz
  3.    100 kHz
  4.    1000 kHz
 Discuss Question
Answer: Option C. -> 100 kHz
Answer: (c).100 kHz
Question 90. Which of the following is the operating frequency of the ESR spectrometer?
  1.    1.7 to 3.4 GHz
  2.    1.5 to 4.2 GHz
  3.    3.2 to 5.4 GHz
  4.    8.8 to 9.6 GHz
 Discuss Question
Answer: Option D. -> 8.8 to 9.6 GHz
Answer: (d).8.8 to 9.6 GHz

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