Process Instrumentation Control and Automation Questions - Set 06 - ObjectiveBooks

Process Instrumentation Control and Automation Questions - Set 06

Practice Test: Question Set - 06


1. What is the Laplace transform of sin t?
    (A) 1/(s2 + 1)
    (B) s/(1 + s2)
    (C) 1/(s2 - 1)
    (D) s/(s2 - 1)

2. A barometer measures the __________ pressure.
    (A) Absolute
    (B) Gauge
    (C) Absolute as well as gauge
    (D) dynamic

3. Thermistors which have a very high temperature co-efficient of resistivity belong to the class of solid called
    (A) Dielectrics
    (B) Insulators
    (C) Semi conductors
    (D) Conductors

4. The inverse Laplace transform of the function  f(S) = 1/S (1 + S) is
    (A) 1 + et
    (B) 1 - et
    (C) 1 + e-t
    (D) 1 - e-t

5. Gain margin is equal to the
    (A) Amplitude ratio
    (B) Reciprocal of amplitude ratio
    (C) Gain in P controller
    (D) Gain in P-I controller

6. A sinusoidal variation in the input passing through a linear first order system
    (A) Becomes more oscillatory (frequency increases)
    (B) Becomes less oscillatory (frequency decreases)
    (C) Gets amplified (magnitude increases)
    (D) Gets attenuated (magnitude decreases)

7. Which of the following shows maximum dip effect (indicating reverse direction of temperature change)?
    (A) Mercury thermometer
    (B) Radiation pyrometer
    (C) Bimetallic thermometer
    (D) Thermocouple

8. Composition of alloys can be determined by
    (A) Polarograph
    (B) Chromatograph
    (C) Refractometer
    (D) None of these

9. Composition of natural gas is determined by the
    (A) Haldane apparatus
    (B) Mass spectrometer
    (C) Chromatograph
    (D) Both (b) and (c)

10. Measurement of pressure in ammonia reactor is done by
    (A) Bourdon gauge
    (B) U-tube manometer
    (C) Inclined tube manometer
    (D) Pirani gauge

11. Photoelectric pyrometers are suitable in the temperature range of ________ °C.
    (A) 400-1600
    (B) 800-1600
    (C) 800-2500
    (D) 400-1000

12. A constant volume gas thermometer employing _________ is used to measure sub-zero (i.e., < 0°C) temperature.
    (A) Helium
    (B) Hydrogen
    (C) Nitrogen
    (D) None of these

13. Flame photometry is used for the determination of compositional analysis of
    (A) Solids
    (B) Alkali metals
    (C) Natural gas
    (D) Isotopes

14. Concentration of sugar solution can be determined by the
    (A) Polarimetry
    (B) Flame photometry
    (C) Emission spectroscopy
    (D) Oscillometry

15. In a shell and tube heat exchanger, the outlet temperature of heating/cooling fluid is the ________ variable.
    (A) Load
    (B) Manipulated
    (C) Controlled
    (D) None of these

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