Comprehension And Aptitude Skills Lab - End Assessment - Part A - Section - B

50 Questions | Total Attempts: 137

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Comprehension And Aptitude Skills Lab - End Assessment - Part A - Section - B

This session carries 50 question to be answered in 60 minutes. Take time in answering.


Questions and Answers
  • 1. 
    Which of the following is the dynamic characteristics of an instrument ?
    • A. 

      Sensitivity

    • B. 

      Dead zone

    • C. 

      Reproducibility

    • D. 

      Fidelity

  • 2. 
      Flapper nozzle is used in a/an __________ controller
    • A. 

      Pneumatic

    • B. 

      Electronic

    • C. 

      Hydraulic

    • D. 

      None of these

  • 3. 
    The temperature of tempering oil baths maintained at 400°C during heat treatment of steel is measured by a/an __________ thermocouple.
    • A. 

      Platinum-platinum/rhodium

    • B. 

      Chromel-alumel

    • C. 

      Iron-constantan

    • D. 

      None of these

  • 4. 
    The closed loop pole of a stable second order system could be
    • A. 

      Both real and positive

    • B. 

      Complex conjugate with positive real parts

    • C. 

      One real positive and the other real negative

    • D. 

      Both real and negative

  • 5. 
     Working principle of radiation pyrometer is based on the
    • A. 

      Kirchoffs law

    • B. 

      Seebeck effect

    • C. 

      Wien's law

    • D. 

      Stafan-Boltzman law

  • 6. 
    Which of the following relates the emf. generated in a single homogeneous wire to the temperature difference ?
    • A. 

      Peltier effect

    • B. 

      Seebeck effect

    • C. 

      Thomson effect

    • D. 

      None of these

  • 7. 
    Response of a system to a sinusoidal input is called __________ response.
    • A. 

      Frequency

    • B. 

      Impulse

    • C. 

      Unit step

    • D. 

      None of these

  • 8. 
    Load cells are used for the measurement of
    • A. 

      Velocity

    • B. 

      Stress

    • C. 

      Strain

    • D. 

      Weight

  • 9. 
    Pick out the first order system from among the following.
    • A. 

      Interacting system of two tanks in series

    • B. 

      Non-interacting system of two tanks in series

    • C. 

      Damped vibrator

    • D. 

      Mercury in glass thermometer kept in boiling water

  • 10. 
    A negative gain margin expressed in decibels means a/an __________ system.
    • A. 

      Critically damped

    • B. 

      Stable

    • C. 

      Unstable

    • D. 

      None of these

  • 11. 
        Which of the following controllers has the least maximum deviation ?
    • A. 

      P-controller

    • B. 

      P-I controller

    • C. 

      P-I-D controller

    • D. 

      P-D controller

  • 12. 
    Which of the following is not a differential pressure flow meter ?
    • A. 

      Flow nozzle

    • B. 

      Rotameter

    • C. 

      Venturimeter

    • D. 

      Orificemeter

  • 13. 
     A typical example of a physical system with under damped characteristic is a
    • A. 

      Thermocouple kept immersed in a liquid filled thermowell

    • B. 

      Spring loaded diaphragm valve.

    • C. 

      U-tube manometer

    • D. 

      CSTR with first order reaction

  • 14. 
      Nichol’s chart deals with
    • A. 

      frequency response values of controllers

    • B. 

      Closed loop values Vs frequency response values

    • C. 

      Closed loop values Vs open loop values

    • D. 

      Open loop values Vs frequency response values

  • 15. 
    Which of the following thermocouples will give the highest output for the same value of hot and cold junction temperature ?
    • A. 

      Platinum-platinum + rhodium

    • B. 

      Iron-constantan

    • C. 

      Chromel-constantan

    • D. 

      All will give the same output

  • 16. 
    A system with a double pole at the origin is unstable since the corresponding term in the time domain
    • A. 

      Is a constant

    • B. 

      Grows exponentially with time

    • C. 

      Grows linearly with time

    • D. 

      Decays linearly with time

  • 17. 
      Thermal wells are used in the temperature measurement to
    • A. 

      Reduce measuring lag

    • B. 

      Increase the sensitivity

    • C. 

      Guard against corrosive and oxidising action on thermocouple materials

    • D. 

      Increase the fidelity

  • 18. 
      Psychrometer determines the
    • A. 

      Humidity of gases

    • B. 

      Moisture content of solids

    • C. 

      Hygroscopic nature of solids

    • D. 

      Water of crystallisation

  • 19. 
     Positioning controllers are used for
    • A. 

      Temperature changes

    • B. 

      Low loads

    • C. 

      High loads

    • D. 

      Flow rate changes

  • 20. 
    The amplitude ratio for the sinusoidal response of a __________ is 1.
    • A. 

      First order system

    • B. 

      Second order system

    • C. 

      Transportation lag

    • D. 

      None of these

  • 21. 
       Pirani gauge is used for the measurement of
    • A. 

      Liquid level under pressure

    • B. 

      Liquid level at atmospheric pressure

    • C. 

      High vacuum

    • D. 

      Very high pressure

  • 22. 
    Bode diagram are generated from output response of the system subjected to which of the following input?
    • A. 

      Impulse

    • B. 

      Sinusoidal

    • C. 

      Ramp

    • D. 

      Step

  • 23. 
    Which of the following controllers has maximum offset ?
    • A. 

      P-controller

    • B. 

      P-I controller

    • C. 

      P-D controller

    • D. 

      P-I-D controller

  • 24. 
     On-off controllers are normally used for
    • A. 

      Flow rate changes

    • B. 

      Temperature changes

    • C. 

      Low loads

    • D. 

      None of these

  • 25. 
          The time constant of a unity gain, first order plus time delay process is 5 min. If the phase lag at a frequency of 0.2 rad/min is 60°, then the dead time (in minutes) is
    • A. 

      π/12

    • B. 

      5π/12

    • C. 

      π/6

    • D. 

      π/3

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