Process Control in Instrumentation MCQ Practice Test - Set 13 - ObjectiveBooks

Process Control in Instrumentation MCQ Practice Test - Set 13

Practice Test: Question Set - 13

1. Dome temperature of blast furnace stove is most accurately measured by a
    (A) Radiation pyrometer
    (B) Platinum-platinum/rhodium thermocouple
    (C) Iron-constantan thermocouple
    (D) Platinum resistance thermometer

2. Resistance of a gas in a vessel is given by (where, P = pressure, V = volume of the vessel, n = no. of moles of the gas, R = gas constant)
    (A) V/nRT
    (B) nRT/V
    (C) nRT/P
    (D) P/nRT

3. The term analogous to voltage in a single tank system is the
    (A) Heat content of the system
    (B) Liquid volume in the tank
    (C) Flow rate
    (D) Level of liquid

4. Which of the following is not a differential pressure flow meter?
    (A) Rotameter
    (B) Flow nozzle
    (C) Orificemeter
    (D) Venturimeter

5. A negative gain margin expressed in decibels means a/an _________ system.
    (A) Stable
    (B) Unstable
    (C) Critically damped
    (D) None of these

6. ________ stability method uses open loop transfer function.
    (A) Nyquist
    (B) Mikhailov
    (C) Ruth
    (D) None of these

7. Humidity of air can be determined by a
    (A) Chromatograph
    (B) Sling psychrometer
    (C) Mass spectrometer
    (D) Polarimeter

8. The unit of 'time constant' of a system is the same as that of
    (A) Velocity
    (B) Time
    (C) (Time)-1
    (D) None of these

9. In a single tank system, the transfer function of level to inlet flow rate is
    (A) R/TS
    (B) R/(TS + 1)
    (C) 1/TS
    (D) None of these

10. An aneroid barometer measures the ________ pressure.
    (A) Atmospheric
    (B) Absolute
    (C) Vacuum
    (D) Gage

11. Pick out the wrong statement
    (A) Proportional controller is normally used for level control in industrial applications
    (B) CSTR can be considered as a distributed parameter system
    (C) Distributed parameter approach gives partial differential equation
    (D) Non-linear behavior is exemplified by an on-off controller

12. What is the Laplace transform of impulse input having magnitude ‘X’?
    (A) X
    (B) X2
    (C) 1/X
    (D) 1

13. 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) Both real and negative
    (D) One real positive and the other real negative

14. The offset introduced by proportional controller with gain Kc in response of first order system can be reduced by
    (A) Reducing value of Kc
    (B) Introducing integral control
    (C) Introducing derivative control
    (D) None of the above

15. Which thermocouple can be used to measure a temperature of around 1400°C?
    (A) Copper-constantan
    (B) Aluminium-Chromel
    (C) Platinum-platinum + rhodium
    (D) None of these

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