Process Control Instrumentation Abbreviations Questions - Set 04 - ObjectiveBooks

Process Control Instrumentation Abbreviations Questions - Set 04

Practice Test: Question Set - 04

1. Which of the following cannot measure a temperature of 1600°C?
    (A) Platinum resistance thermometer
    (B) Thermocouple
    (C) Photo-electric pyrometer
    (D) Radiation pyrometer

2. Radiation thermometer cannot measure the temperature
    (A) Inside a pressure vessel
    (B) Of an object without coming in contact with it
    (C) Of liquid oxygen
    (D) Of moving objects at high temperature

3. Which of the following instruments is not used for measuring sub-zero (<0°) temperatures?
    (A) Platinum resistance thermometer
    (B) Mercury in glass thermometer
    (C) Vapor pressure thermometer
    (D) Radiation pyrometer

4. The transfer function for an ideal proportional plus reset controller (reset time T) is
    (A) Kc[1 + (1/TS)]
    (B) Kc(1 + TS)
    (C) Kc/(1 + TS)
    (D) Kc/[1 + (s/T)]

5. Maximum differential pressure in liquid manometer is ________ psi.
    (A) 20
    (B) 30
    (C) 40
    (D) 50

6. A pyranometer is an instrument used for measuring the
    (A) Beam radiation
    (B) Global radiation
    (C) Bright sunshine period
    (D) None of these

7. Which is the strongest paramagnetic gas?
    (A) CO2
    (B) O2
    (C) NO
    (D) NO2

8. Thermistors are made of
    (A) Ultra pure metals
    (B) Metal oxides
    (C) Iron-copper alloys
    (D) Nickel-chromium alloys

9. Liquid column manometers are used for measuring the pressure _________ kgf/cm2.
    (A) > 2 (gage)
    (B) < 3 (gage)
    (C) < 10 (gage)
    (D) < atmospheric

10. Stabilizing time for the controllers is the time required for the response to reach _________ percent of its ultimate value.
    (A) 63.2
    (B) 87.5
    (C) 95
    (D) 100

11. Continuous measurement of moisture content of paper in paper industry is done by measuring the
    (A) Thermal conductivity through the paper
    (B) Electrical resistance through the paper
    (C) Magnetic susceptibility
    (D) None of these

12. The initial value (t = 0) of the unit step response of the transfer function [(s + 1)/(2s + 1)] is
    (A) 0
    (B) ½
    (C) 1
    (D) 2

13. Mcleod gauge measures the ________ pressure.
    (A) Positive
    (B) Sub-atmospheric
    (C) Very high
    (D) Atmospheric

14. Normal mercury thermometer can be used to measure a temperature of about 300°C. However, its maximum temperature measurement range can be increased upto about 500°C by
    (A) Filling nitrogen under pressure in the stem
    (B) Increasing the diameter of the tube
    (C) Using steel tube in place of glass tube
    (D) Accounting for the tube expansion

15. The Laplace transform of a sinusoidal function (e.g.; sin at) is represented by the curve
Process Control - Set 04, Question No. 15

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