Process Control and Instrumentation Objective Questions - ObjectiveBooks
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Process Control and Instrumentation Objective Questions

Practice Test: Question Set - 23


1. Strain gage pressure transducers are used to measure _________ pressures.

    (A) Gage as well as vacuum
    (B) Absolute as well as differential
    (C) Both (a) and (b)
    (D) Neither (a) nor (b)

2. Out of the following temperature measuring instruments, the measurement accuracy will be minimum for the

    (A) Mercury in glass thermometer
    (B) Optical pyrometer
    (C) Iron-constantan thermocouple
    (D) Alcohol filled thermometer

3. Starting temperature of optical radiation pyrometer is ________ °C.

    (A) 800
    (B) 400
    (C) 1200
    (D) 1500

4. Which of the following is a desirable characteristic of an instrument?

    (A) High drift
    (B) High fidelity
    (C) High measuring lag
    (D) Poor reproducibility

5. Emission spectroscopy is used for

    (A) Solids and metal analysis
    (B) Determining water purity
    (C) Determination of CO2 in gases
    (D) NOx determination

6. The response of two tanks of same size and resistance in series is

    (A) Under damped
    (B) Critically damped
    (C) Over damped
    (D) None of the above

7. Pick out the first order system from among the following.

    (A) Damped vibrator
    (B) Mercury in glass thermometer kept in boiling water
    (C) Interacting system of two tanks in series
    (D) Non-interacting system of two tanks in series

8. Working principle of radiation pyrometer is based on the
    (A) Wien's law
    (B) Kirchoff’s law
    (C) Stefan-Boltzmann law
    (D) Seebeck effect

9. Which of the systems having following transfer functions is stable?

    (A) 1/(s2 + 2)
    (B) 1/(s2 - 2s + 3)
    (C) 1/(s2 + 2s + 2)
    (D) exp (-20s)/(s2 + 2s - 1)

10. Which of the following is not a speed measuring instrument?

    (A) Psychrometer
    (B) Stroboscope
    (C) Tachometer
    (D) All (a), (b) and (c)

11. Dead zone in an instrument must be less than ________ percent of the scale.

    (A) 0.2
    (B) 1.5
    (C) 4
    (D) 8

12. The transfer function for a first order process with time delay is

    (A) (eTdS)/(TS + 1)
    (B) (e-TdS)/(TS + 1)
    (C) 1/(TS + 1)(TdS + 1)
    (D) TdS/(Ts + 1)

13. ________ type of element is normally not used in the bimetallic thermometers.

    (A) Flat spiral
    (B) Bourdon tube
    (C) Single helix
    (D) Multiple helix

14. Alphatron measures pressure ________ microns.

    (A) < 1
    (B) < 3
    (C) > 3
    (D) < 0.1

15. Psychrometer determines the

    (A) Humidity of gases
    (B) Moisture content of solids
    (C) Water of crystallization
    (D) Hygroscopic nature of solids

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