Fundamentals of Process Control and Instrumentation - Set 21 - ObjectiveBooks

# Practice Test: Question Set - 21

1. Which of the following temperature measuring instruments need not touch the object whose temperature is being measured?
(B) Filled system thermometer
(C) Mercury in glass thermometer
(D) Thermo electric pyrometer

2. Zirconia probe is used for the measurement of
(A) Humidity of air
(B) % CO2 in flue gas
(C) % O2 in flue gas
(D) Speed of a submarine

3. A process is initially at steady state with its output y = 1 for an input u = 1. The input is suddenly changed to 2 at time t = 0. The output response is y(t) = 1 + 2t. The transfer function of the process is
(A) 2/s
(B) 1 + (2/s2)
(C) 1 + (2/s)
(D) (1/s) [1 + (2/s)]

4. Volumetric expansion is the working principle of the __________ thermometers.
(A) Mercury in glass
(B) Constant volume gas
(C) Vapor pressure
(D) Bimetallic

5. In a shell and tube heat exchanger, the inlet temperature of heating/cooling fluid is the __________ variable.
(B) Manipulated
(C) Controlled
(D) None of these

6. The amplitude ratio for the sinusoidal response of __________ is < 1.
(A) Transportation lag
(B) First order system
(C) Second order system
(D) None of these

7. The _________ of a vapor pressure thermometer is a secondary element.
(A) Pointer
(B) Bourdon tube
(C) Bulb
(D) None of these

8. A simple pitot tube measures the
(A) Average velocity
(B) Maximum velocity
(C) Point velocity
(D) Static pressure

9. Thermistors are used in _________ devices.
(A) Voltage measuring
(B) Temperature measuring
(C) Temperature compensating
(D) Both (b) & (c)

10. Pressure of 0.01 psi (absolute) can be measured by _________ gauge.
(A) Ionization
(B) Pirani
(C) Mcleod
(D) None of these

11. Thermistor, which has high temperature co-efficient of resistivity, is used as the sensing element in resistance thermometer. It is a/an
(A) Insulator
(B) Conductor
(C) Solid semi-conductor
(D) Liquid semi-conductor

12. Flow rate of sludge is not measured by a/an
(A) Orificemeter
(B) Open weir
(C) Kennison nozzle
(D) Both (b) & (c)

13. The _________ of the fluid contained in the temperature sensing element (i.e., bulb) of filled system thermometers changes with change in temperature.
(A) Pressure
(B) Volume
(C) Viscosity
(D) All (a), (b) and (c)

14. Temperature measuring instruments are standardized mostly with _________ points of pure substances.
(A) Melting
(B) Boiling
(C) Both (a) & (b)
(D) Neither (a) nor (b)

15. For a feed back control system to be stable, the
(A) Roots of the characteristic equation should be real
(B) Poles of the closed loop transfer function should lie in the left half of the complex plane
(C) Bode plots of the corresponding open loop transfer function should monotonically decrease
(D) Poles of the closed loop transfer function should lie in the right half of the complex plane

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