Process Control Instrumentation Viva Questions Practice - Set 18 - ObjectiveBooks
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# Practice Test: Question Set - 18

1. Polarization of light forms the working principle of a
(A) Polarimeter
(B) Polarograph
(C) Chromatograph
(D) Spectrometer

2. An amplitude ratio of 0.1 corresponds to _________ decibels.
(A) 20
(B) -20
(C) 10
(D) -10

3. The transfer function for a PID controller is (where, τ i is the integral (reset) time and τD is the derivative time.
(A) Kc(1 + τis + τD ). s
(B) Kc[1 + (1/τis) + τD . s]
(C) Kc(1 + τis + (1/τD . s)
(D) None of these

4. Emf developed by a thermocouple while measuring a temperature of 400°C is 22 mV. The type of thermocouple used is
(A) Chromel-alumel
(B) Iron-constantan
(C) Platinum-rhodium
(D) Platinum-platinum + rhodium

5. Stalagmometer is used for the measurement of
(A) Kinematic viscosity
(B) Surface tension
(C) Refractive index
(D) Optical activity

6. What is the dynamic error in a critically damped second order instrument for a ramp input (At)?
(A) 0.5 AT
(B) 2 AT
(C) √(AT)
(D) 1.5 AT

7. The symbol for "capillary line" in instrumentation diagram is

8. Gas analysis is commonly done using the
(A) Thermal conductivity cell
(B) X-ray diffraction
(C) Mass spectrometer
(D) Emission spectrometer

9. Which of the systems having the following transfer function is stable?
(A) 1/(S2 + 2)
(B) 1/(S2 - 2S + 3)
(C) 1/(S2 + 2S + 2)
(D) exp (-20 S)/(S2 + 2S - 1)

10. Load cells are used for the measurement of
(A) Stress
(B) Weight
(C) Strain
(D) Velocity

11. Which of the following fluid flow measuring devices can measure the largest flow rate?
(A) V-notch
(B) Rotameter
(C) Orificemeter
(D) Weir

12. Turbine flow meters are suitable for
(A) Very limited flow ranges
(B) Cryogenic flow measurements
(C) Aerospace and in air borne applications
(D) Both (b) and (c)

13. The operation of a Rotameter is based on
(A) Variable flow area
(B) Rotation of a turbine
(C) Pressure drop across a nozzle
(D) Pressure at a stagnation point

14. Out of the following thermocouple wire insulating material, the highest temperature rating is for
(A) Teflon
(B) Ceramic fibre
(C) Asbestos
(D) Fibre glass

15. The unit step response of the transfer function 1/(s2 + 2s + 3)
(A) Has a non-zero slope at the origin
(B) Has a damped oscillatory characteristics
(C) Is overdamped
(D) Is unstable

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