Process Control and Instrumentation Lecture Notes Questions - Set 09 - ObjectiveBooks

# Practice Test: Question Set - 09

1. Thermodynamic Celsius scale of temperature measurement is
(A) Defined on the basis of melting point of ice and evaporation temperature of water vapor
(B) Defined on the basis of melting point of ice and condensation temperature of water vapor
(C) Having an interval of 100° between ice point to steam point
(D) Both (b) and (c)

2. Response of a linear control system for a change in set point is called
(A) Frequency response
(B) Transient response
(C) Servo problem
(D) Regulator problem

3. Bourdon gauges are used for measuring pressure (kg/cm2)
(A) < atmospheric
(B) > 2 (gauge)
(C) < 2 (gauge)
(D) > 10 (absolute)

4. Stroboscope is used for the measurement of
(A) Rpm of a flywheel
(B) Frequency of light
(C) Depression of freezing point
(D) Liquid level under pressure

5. Radiation pyrometers as compared to thermocouples
(A) Has a slower speed of response
(B) Can measure higher temperature
(C) Can’t measure the temperature of moving objects
(D) Is more affected by corrosive atmosphere

6. Nickel percentage in invar which is an iron-nickel alloy, and is used as a thermocouple material is
(A) 12
(B) 36
(C) 54
(D) 68

7. Number of poles in a system with transfer function 1/(s2 + 2s2 + 1) is
(A) 2
(B) 5
(C) 3
(D) 1

8. Conversion formula for converting amplitude ratio (AR) into decibels is
(A) Decibel = 20 log10 (AR)
(B) Decibel = 20 loge (AR)
(C) Decibel = 20 log10 (AR)0.5
(D) Decibel = 20 loge (AR)0.5

9. Thermocouple in a thermal well behaves as a true
(A) First order system
(B) Second order system (overdamped)
(C) Multiple first order system
(D) Second order system (underdamped)

10. Liquid flow rate in an open channel cannot be measured by a/an
(A) Orifice meter
(B) Cipolletti weir
(C) Rectangular weir
(D) V-notch

11. Stability of a control system containing a transportation lag can be best analyzed by
(A) Routh test
(B) Root locus methods
(C) Frequency response methods
(D) None of these

12. Temperature of molten pig iron (1450°C) and molten slag (1500°C) flowing out of a blast furnace is measured by a/an
(A) Chromel-alumel thermocouple
(B) Optical pyrometer
(D) Either (b) or (c)

13. Accurate temperature measurement performance of a radiation pyrometer cannot be affected, if the
(A) Enhancement or attenuation of radiation occurs in the sighting path
(B) Object and surrounding are at almost the same temperature
(C) Object has varying emissivity
(D) Object is transparent

14. Which of the following is never used as an element of industrial resistance thermometer?
(B) Nickel
(C) Copper
(D) 30% iron + 70% nickel

15. The open loop transfer function of a process is K [{(s + 1) (s + 4)}/{(s + 2) (s + 3)}]. In the root locus diagram, the poles will be at
(A) -1, -4
(B) 1, 4
(C) -2, -3
(D) 2, 3

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