Process Control Instrumentation Manufacturers MCQs - Set 16 - ObjectiveBooks

# Practice Test: Question Set - 16

1. What is the ratio of output amplitude to input amplitude for a sinusoidal forcing function in a first order system?
(A) 1
(B) > 1
(C) < 1
(D) None of these

2. The second order system with the transfer function 4/(s2 + 2s + 4) has a damping ratio of
(A) 2.0
(B) 0.5
(C) 1.0
(D) 4.0

3. Flow rate through an orifice is _________ the pressure differential.
(A) Proportional to
(B) Inversely proportional to the square root of
(C) Proportional to the square root of
(D) Inversely proportional to the square of

4. The calibration data of a thermocouple with its cold junction at 0°C are given below.

The hot junction of the thermocouple is placed in a bath at 80°C, while its cold junction is at 20°C. What is the emf of thermocouple?

(A) 3.26 mv
(B) 0.80 mv
(C) 2.46 mv
(D) 2.43 mv

5. Which of the following is not the triple point of water?
(A) 32°R
(B) 273°K
(C) 492°R
(D) 32°F

6. Presence of a small amount of water in the organic systems can be determined by the _________ method.
(A) Electrical conductivity
(B) Polarimetry
(C) Emission spectroscopy
(D) Dielectric constant end loss factor

7. Measurement of sub-zero Celsius temperature in industry is done most commonly by
(A) Thermocouples
(B) Resistance thermometers
(C) Gas thermometers
(D) Bi-metallic thermometers

8. Working principle of radiation pyrometer is based on the
(A) Wien's law
(B) Kirchoff’s law
(C) Stefan Boltzmann law
(D) Seebeck effect

9. Characteristic equation is the denominator of _________ loop transfer function.
(A) Open
(B) Closed
(C) Both (a) and (b)
(D) Neither (a) nor (b)

10. Which of the following controllers has maximum offset?
(A) P-controller
(B) P-I controller
(C) P-D controller
(D) P-I-D controller

11. Smoke density of the flue gas going out of the chimney is measured by a
(A) Polarograph
(B) Thermal conductivity meter
(C) Photo electric cell
(D) Chromatograph

12. Which of the following flow-metering instruments is an areameter?
(A) Venturimeter
(B) Rotameter
(C) Pitot tube
(D) Hot wire anemometer

13. The experimental response of the controlled variable y(t) for a step change of magnitude ‘P’ in the manipulated variable x(t) is shown below: The appropriate transfer function of the process is
(A) (Q/P) e-(Q/R)S/(TdS + 1)
(B) (Q/R) e-TdS/(Q/P) (S + 1)
(C) (Q/P) e-TdS/(Q/R) (S + 1)
(D) (Q/R) e-(P/Q)S/(TdS + 1)

14. A magnetic flowmeter is
(A) Based on the principle of Faraday's law
(B) Capable of measuring the flow rate of slurries and electrolytes
(C) Based on the linear relationship between the fluid flow rate and the induced voltage
(D) All (a), (b) and (c)

15. Which is the most suitable instrument for measuring pressure below 3 microns?
(A) Mcleod gauge
(B) Alphatron
(C) Ionisation gauge
(D) Bourdon gauge

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