Process Control Instrumentation is the Technology MCQ Test - Set 14 - ObjectiveBooks

Process Control Instrumentation is the Technology MCQ Test - Set 14

Practice Test: Question Set - 14


1. Which of the following is not a variable area flow meter?
    (A) Piston type meter
    (B) Rotameter
    (C) Magnetic flow meter
    (D) Orifice and tapered plug meter

2. Which of the following measurements can be made by the measurement of emf?
    (A) pH value
    (B) Degree of hydrolysis
    (C) Composition of complex ions
    (D) All (a), (b) & (c)

3. Configuration of Bourdon spring tube is never made of ________ shape.
    (A) Circular
    (B) Semi-circular
    (C) Helical
    (D) Spiral

4. Sub-zero temperature (< 0°C) can be measured by a constant volume gas thermometer employing
    (A) Helium
    (B) Nitrogen
    (C) Hydrogen
    (D) None of these

5. Nichol's chart deals with
    (A) A.R. vs. phase lag of first order
    (B) A.R. vs. phase lag of second order
    (C) Closed loop values vs. open loop values
    (D) Frequency response values of controllers

6. Specific conductance is defined as the reciprocal of resistance in ohms of 1c.c. of liquid at a specified temperature. Its value for distilled water is about _________ micro mho/cm3.
    (A) 50
    (B) 100
    (C) 10
    (D) 1

7. Transfer functions X/Y for which of the following block diagrams is (G1 + G1. G2. G3)/(1 + G2. G3)

8. Select the correct statement from the following.
    (A) The frequency response of a pure capacity process is unbounded
    (B) The phase lag of a pure time delay system decreases with increasing frequency
    (C) The amplitude ratio of a pure capacity process is inversely proportional to frequency
    (D) The amplitude ratio of a pure time delay system increases with frequency

9. The deflection in diaphragm (which is used as pressure sensor in pneumatic and electronic instruments) is dependent on the metal thickness, its diameter (d) and shape & number of corrugations. Its deflection is proportional to
    (A) d
    (B) d2
    (C) d3
    (D) d4

10. An ideal PID controller has the transfer function [1 + (1/0.55) + 0.25]. The frequency at which the magnitude ratio of the controller is 1, is
    (A) 0.5/0.2
    (B) 0.2/0.5
    (C) 0.2 × 0.5
    (D) 1/√(0.2 × 0.5)

11. In a shell and tube heat exchanger, the flow rate of heating/cooling fluid is the __________ variable.
    (A) Load
    (B) Controlled
    (C) Manipulated
    (D) None of these

12. Phase lag of the frequency response of a second order system to a sinusoidal forcing function
    (A) Is 30°
    (B) Is 90° at the most
    (C) Approaches 180° asymptotically
    (D) Is 120°

13. Reset rate is the another term used for ________ time.
    (A) Dead
    (B) Integral
    (C) Derivative
    (D) None of these

14. Which of the following is an undesirable dynamic characteristic of an instrument?
    (A) Reproducibility
    (B) Dead zone
    (C) Time lag
    (D) Static error

15. The transfer function of a pure dead time system with dead time τd is
    (A) 1/(τds + 1)
    (B) τds + 1
    (C) ess
    (D) eτ ds

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