Lakshya Education MCQs

Question: The frequency at which maximum amplitude ratio is attained is called the __________ frequency.
Answer: Option B

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Question 1. Continuous flue gas analyser makes use of paramagnetic properties of some of its constituents, which move towards the strongest part of the magnetic field thus displacing diamagnetic gases. Which of the following gases is diamagnetic?
  1.    CO₂
  2.    O₂
  3.    NO
  4.    NO₂
Answer: Option A
Question 2. Sub-zero temperature (< 0°C) can be measured by a constant volume gas thermometer employing
  1.    Helium
  2.    Nitrogen
  3.    Hydrogen
  4.    None of these
Answer: Option A
Question 3. Minute depression of freezing point of a liquid solvent on addition of a solid solute can be best measured by a
  1.    Beckman thermometer
  2.    Dilatometer
  3.    Mercury thermometer
  4.    Bimetallic thermometer
Answer: Option A
Question 4. The Laplace transform of exp(at), where a > 0, is defined only for the Laplace parameter, s > a since
  1.    The function is exponential
  2.    The Laplace transform of integral of exp(at) has finite values only for s > a
  3.    The Laplace transform integral of exp(at) has initial values only for s > a
  4.    The function exp(at) is piece-wise continuous only for s > a
Answer: Option B
Question 5. A first order system with unity gain and time constant τ is subjected to a sinusoidal input of frequency w = 1/τ. The amplitude ratio for this system is
  1.    1
  2.    0.5
  3.    1/√2
  4.    0.25
Answer: Option C
Question 6. The transfer function of a pure dead time system with dead time τd is
  1.    1/(τds + 1)
  2.    Τds + 1
  3.    E-τds
  4.    Eτds
Answer: Option C

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