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MCQs

Total Questions : 170 | Page 6 of 17 pages
Question 51. Zero crossing detector has ____________ as reference voltage.
  1.    +ve Vcc
  2.    –ve Vcc
  3.    Zero V
  4.    5V
 Discuss Question
Answer: Option C. -> Zero V
Answer: (c).Zero V
Question 52. Difference between levels on input that causes transition in Schmitt trigger is ___________
  1.    Hysteresis
  2.    Threshold
  3.    Cut-off value
  4.    Peak value
 Discuss Question
Answer: Option A. -> Hysteresis
Answer: (a).Hysteresis
Question 53. Which of the following detect the presence of a voltage between two voltages?
  1.    Zero crossing detector
  2.    Differential comparator
  3.    Window comparator
  4.    None of the mentioned
 Discuss Question
Answer: Option C. -> Window comparator
Answer: (c).Window comparator
Question 54. Schmitt trigger is a sine wave generator.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 55. Which of the following are used in window comparators?
  1.    Op-amps and AND gates
  2.    OP-amps and OR gates
  3.    Op-amps and XOR gates
  4.    OP-amps and NAND gates
 Discuss Question
Answer: Option A. -> Op-amps and AND gates
Answer: (a).Op-amps and AND gates
Question 56. Balanced and double balanced modulators produce ________________
  1.    Amplitude modulated signal
  2.    Frequency modulated signal
  3.    Both AM and FM
  4.    None of the mentioned
 Discuss Question
Answer: Option A. -> Amplitude modulated signal
Answer: (a).Amplitude modulated signal
Question 57. Indirect FM generators uses ____________
  1.    Crystal oscillator
  2.    Wien bridge oscillator
  3.    LC oscillator
  4.    RC tuned circuit
 Discuss Question
Answer: Option A. -> Crystal oscillator
Answer: (a).Crystal oscillator
Question 58. Power level of FM signal in space telemetry and entertainment system are equal.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 59. FM generators for communication has frequency ______________
  1.    Less than 10MHz
  2.    Between 10MHz and 100MHz
  3.    Between 100MHz and 300MHz
  4.    Above 500MHz
 Discuss Question
Answer: Option B. -> Between 10MHz and 100MHz
Answer: (b).Between 10MHz and 100MHz
Question 60. Amstrong modulator is _________________
  1.    Direct modulator
  2.    Indirect modulator
  3.    Unbalanced modulator
  4.    Balanced modulator
 Discuss Question
Answer: Option B. -> Indirect modulator
Answer: (b).Indirect modulator

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