Phase Lock Loop MCQ

Test your knowledge with important Phase Lock Loop MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Phase Lock Loop MCQs at Bissoy

• The transfer function of PD is :
  ক

  Constant

  খ

  Varies with frequency

  গ

  Varies with voltage

  ঘ

  None of the Mentioned
• Number of poles in Type 1 PLL is:
  ক

  0

  খ

  1

  গ

  2

  ঘ

  None of the mentioned
• If high pass filter is used instead of Low pass filter in the PLL the response of PLL would be:
  ক

  Output Voltage is not a square wave

  খ

  Output Voltage contains many high frequency waves

  গ

  VCO will be unstable due to variations in control voltage

  ঘ

  All of the mentioned
• If the input of type 1 PLL is a frequency step of Δw at t = 0, the change in phase at t = infinity is:
  ক

  Δw

  খ

  Δw/Kpd

  গ

  Δw/Kpd.Kvco

  ঘ

  None of the mentioned
• Instead of Phase detection, if Frequency detector is used the drawback PLL would face is:
  ক

  Finite difference between input and output frequency

  খ

  Equality cannot be established if PLL compared input and output frequency rather than pulses

  গ

  Error between Vin and Vout cannot be removed

  ঘ

  All of the mentioned
• What is the function of LPF in the following block diagram?
  ক

  Suppress high frequency components of VCO output and presenting low frequency AC signal to PD

  খ

  Suppress high frequency components of PD output and presenting low frequency AC signal to VCO

  গ

  Suppress high frequency components of PD output and presenting DC signal to VCO

  ঘ

  None of the mentioned
• The aligning of output phase of voltage controlled oscillator with reference is called:
  ক

  Phase compensation

  খ

  Phase alignment

  গ

  Phase Locking

  ঘ

  Phase detecting
• What is the relation between input and output in the following circuit?
  ক

  Exponential

  খ

  Linear

  গ

  Sinusoidal

  ঘ

  None of the mentioned
• What is the input at the phase detector?
  ক

  V1(t) – V2(t)

  খ

  Phase(V1) + Phase(V2)

  গ

  Phase(V1) – Phase(V2)

  ঘ

  V1(t) + V2(t)
• The Logic gate that works similar to phase detector is:
  ক

  AND gate

  খ

  OR gate

  গ

  XOR gate

  ঘ

  NOT gate
• The PLL device is:
  ক

  Feedback system that compares output frequency and input frequency

  খ

  Feedback system that compares output phase and input phase

  গ

  Linear system that compares output resistance and input resistance

  ঘ

  Non Linear system that compares output current and input current