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Chemical Engineering :: Process Control and Instrumentation

  1. The thermal emf-temperature relationship of most thermocouples is

  2. A.
    linear
    B.
    parabolic
    C.
    exponential
    D.
    square root

  3. Which is the strongest paramagnetic gas?

  4. A.
    CO2
    B.
    O2
    C.
    NO
    D.
    NO2

  5. In Bode plot, A.R. vs. w is plotted on a/an __________ graph paper.

  6. A.
    log-lag
    B.
    triangular
    C.
    ordinary
    D.
    semi-log

  7. 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

  8. A.
    1
    B.
    0.5
    C.
    1/2
    D.
    0.25

  9. A control system has the following transfer function

    The initial value of the corresponding time function is

  10. A.
    1
    B.
    1/8
    C.
    7/8
    D.
    -1

  11. For measuring the temperature of a red hot furnace, which is the most suitable instrument ?

  12. A.
    Platinum resistance thermometer
    B.
    Thermocouple
    C.
    Optical pyrometer
    D.
    Bimetallic thermometer

  13. Continuous measurement of specific gravity of a liquid is done by

  14. A.
    hydrometer
    B.
    contact-type electric indicators
    C.
    displacement meter
    D.
    both (a) and (c)

  15. Stroboscope is used for the measurement of

  16. A.
    rpm of a flywheel
    B.
    frequency of light
    C.
    depression of freezing point
    D.
    liquid level under pressure

  17. The root locus plot of the roots of the characteristics equation of a closed loop system having the open loop transfer function will have a definite num-ber of loci for variation of K from 0 to ∞. The number of loci is

  18. A.
    1
    B.
    3
    C.
    4
    D.
    2

  19. In second order underdamped system,

  20. A.
    decay ratio = overshoot
    B.
    decay ratio = (overshoot)2
    C.
    overshoot increases for increasing damping co-efficient.
    D.
    large damping co-efficient means smaller damping.