Introduction to Process Control and Instrumentation MCQ Test - Set 17 - ObjectiveBooks

Introduction to Process Control and Instrumentation MCQ Test - Set 17

Practice Test: Question Set - 17

1. Paramagnetism method is not used for the composition determination of _________ in gases.
    (A) Oxygen
    (B) Oxides of nitrogen
    (C) Carbon dioxide
    (D) Any of these

2. ________ is undesirable in thermocouples used in industries,
    (A) Linear relation of emf to temperature
    (B) Corrosion resistance
    (C) Oxidation resistance
    (D) Non-linear relation of emf to temperature

3. Mercury manometer (U-tube type) exemplifies a _________ order system.
    (A) Zero
    (B) First
    (C) Second
    (D) Third

4. Small furnace draught is accurately measured by an inclined tube manometer, in which the manometric liquid used most commonly is
    (A) Water
    (B) Carbon tetrachloride
    (C) Paraffin
    (D) Ethylene glycol

5. Liquid argon level in a pressurized storage tank (at 3 kg/cm2) is measured by a/an
    (A) Gage glass
    (B) External float gage
    (C) Differential pressure gage
    (D) None of these

6. Which of the following relates the absorption & evolution of heat at the junctions of a thermocouple to the current flow in the circuit?
    (A) Seebeck effect
    (B) Peltier effect
    (C) Joule heating effect
    (D) Thomson effect

7. E.m.f. generated by thermocouples is of the order of
    (A) Milli volts
    (B) Micro volts
    (C) Volts
    (D) Kilo volts

8. The term analogous to the electrical current in a thermal system is the
    (A) Temperature difference
    (B) Heat flow rate
    (C) Heat content in the system
    (D) None of these

9. Pick out the one which is a first order instrument.
    (A) Mercury in glass thermometer (without any covering or air gap)
    (B) Bare metallic thermometer
    (C) Bare vapor pressure thermometer
    (D) All (a), (b) and (c)

10. The open loop transfer function of a control system is KR/(1 + TS). This represents
    (A) A first order system
    (B) Dead time system
    (C) A first order time lag
    (D) A second order system

11. The frequency response of a dynamic element shows a constant magnitude ratio at all frequencies. The element exhibits a negative phase shift at all frequencies. The absolute value of the phase shift increases linearly with frequency. The element has the transfer function
    (A) eS
    (B) (T1S + 1)/(T2S + 1)
    (C) (T1S/(T2S + 1)
    (D) (T1S + 1)/(T2S)

12. Dilute wine was used as a thermometric liquid initially to develop temperature scale. First empirical temperature scale developed was the _________ scale.
    (A) Kelvin
    (B) Centigrade
    (C) Fahrenheit
    (D) Reaumer

13. Suppose that the gain, time constant and dead time of a process with the following transfer function: Gc(s) = 10 exp( - 0.1s)/(0.5s + 1) are known with a possible error of ± 20% of their values. The largest permissible gain Kc of a proportional controller needs to be calculated below taking the values of process gain, time constant and dead time as
    (A) 8, 0.6, 0.08
    (B) 12, 0.6, 0.12
    (C) 8, 0.6, 0.12
    (D) 12, 0.4, 0.08

14. ________ are analyzed using a Polarograph.
    (A) Isotonic solutions
    (B) Solids
    (C) Liquids
    (D) Gases

15. Transfer function of transportation lag is
    (A) eTS
    (B) e-TS
    (C) 1/(Ts + 1)
    (D) None of these

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