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Chemical Engineering
Process Control And Instrumentation
Quiz 3
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Q.1
Thermal conductivity measurement is used for the determination of
O₂ percentage in the flue gas
Specific gravity of petrofuels
Composition of an alloy
CO₂ percentage in the flue gas
Q.2
Instrumentation in a plant offers the advantage of
Greater safety of operation
Better quality of product
Greater operation economy
All of the above
Q.3
Liquid column manometers are used for measuring the pressure __________ kgf/cm² .
> 2(gage)
< 3 (gage)
< 10 (gage)
< atmospheric
Q.4
Pressure of 0.01 psi (absolute) can be measured by __________ gauge.
Ionisation
Pirani
Mcloid
None of these
Q.5
Dome temperature of blast furnace stove is most accurately measured by a
Radiation pyrometer
Platinum-platinum/rhodium ther-mocuple
Iron-constantan thermocouple
Platinum resistance thermometer
Q.6
__________ temperature scale assigns 0° to the 'ice point' and 80° to the 'steam point'.
Celcius
Rankine
Reumur
Farenhite
Q.7
Nickel percentage in invar which is an iron-nickel alloy, and is used as a thermocouple material is
12
36
54
68
Q.8
Which of the following controllers has the least maximum deviation?
P-controller
P-I controller
P-I-D controller
P-D controller
Q.9
__________ controller has the maximum stabilising time.
P
PD
PI
PID
Q.10
With increase in temperature, the electrical conductivity of the platinum used in the resistance thermometer
Increases
Decreases
Remains constant
Increases exponentially
Q.11
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
Filling nitrogen under pressure in the stem
Increasing the diameter of the tube
Using steel tube in place of glass tube
Accounting for the tube expansion
Q.12
The root locus plot of the roots of the characteristics equation of a closed loop system having the open loop transfer function K(s + 1)/2(2s + 1)(3s + 1) will have a definite number of loci for variation of K from 0 to ∞. The number of loci is
1
3
4
2
Q.13
Phase lag of the frequency response of a second order system to a sinusoidal forcing function
Is 30°
Is 90° at the most
Approaches 180° asymptotically
Is 120°
Q.14
Silver point temperature is __________ °C.
760.5
860.5
960.5
1060.5
Q.15
The inverse Laplace transform of the function f(s) = 1/S(1 + S) is
1 + e
t
1 - e
t
1 + e
-t
1 - e
-t
Q.16
Very low pressure is expressed in microns(μ), which is equal to __________ mm of Hg coloumn (absolute) at 0°C.
0.0001
0.001
0.01
0.1
Q.17
Select the correct statement from the following.
The frequency response of a pure capacity process is unbounded
The phase lag of a pure time delay system decreases with increasing frequency
The amplitude ratio of a pure capacity process is inversely proportional to frequency
The amplitude ratio of a pure time delay system increases with frequency
Q.18
Humidity of air can be determined by a
Chromatograph
Sling psychrometer
Mass spectrometer
Polarimeter
Q.19
Operating range of a temperature measuring instrument is 800 to 1600°C. It could be a/an __________ pyrometer.
Radiation
Optical
Photoelectric
None of these
Q.20
Flow rate measurement of hostile acids and alkalis can be most suitably done by a/an
Venturimeter
Orificemeter
Magnetic flow meter
Hot wire anemometer
Q.21
An emf of the order of mV is generated when two solutions of different hydrogen ion concentration are separated by a thin glass wall. This is the working principle of a
PH meter
Polarimeter
Chromatograph
Polarograph
Q.22
The open loop transfer function of a control system is KR/(1 + TS) . This represents
A first order system
Dead time system
A first order time lag
A second order system
Q.23
Which of the following is not classified as a thermo electric pyrometer?
Resistance thermometer
Thermocouple
Optical pyrometer (disappearing filament type)
Radiation pyrometer
Q.24
The temperature of tempering oil baths maintained at 400°C during heat treatment of steel is measured by a/an __________ thermocouple.
Chromel-alumel
Iron-constantan
Platinum-platinum/rhodium
None of these
Q.25
Change of angle of refraction with composition comprises the working principle of a
Polarimeter
Polarograph
Spectrometer
Refractrometer
Q.26
Identify an unbounded input from inputs whose transfer functions are given below
1
1/S
1/S²
1/(S² + 1)
Q.27
Alphatron measures pressure __________ microns.
< 1
< 3
> 3
< 0.1
Q.28
A system with transfer function (2S/4S) + 1 is of __________ order.
Zero
1st
2nd
3rd
Q.29
Routh test
Criterion provides information about the actual location of roots
Cannot be used to test the stability of a control system containing transportation lag
Criterion is not applicable to systems with polynomial characteristic equation
Can not determine as to how many roots of the characteristics equation have positive real roots
Q.30
Measurement of pressure in ammonia reactor is done by
Bourdon gauge
U-tube manometer
Inclined tube manometer
Pirani guage
Q.31
Response of a linear control system for a change in set point is called
Frequency response
Transient response
Servo problem
Regulator problem
Q.32
A negative gain margin expressed in decibels means a/an __________ system.
Stable
Unstable
Critically damped
None of these
Q.33
__________ are analysed using a polarograph.
Isotonic solutions
Solids
Liquids
Gases
Q.34
A simple pitot tube measures the
Average velocity
Maximum velocity
Point velocity
Static pressure
Q.35
Flow rate of sludge is not measured by a/an
Orificemeter
Open weir
Kennison nozzle
Both B & C
Q.36
__________ is undesirable in thermocouples used in industries,
Linear relation of emf to temperature
Corrosion resistance
Oxidation resistance
Non-linear relation of emf to temperature
Q.37
The fluid used in hydraulic controller is
Water
Steam
Air
Oil
Q.38
Liquid discharge from a tank or reservoir can not be measured by
Orificemeters
Weirs
Mouthpieces
Notches
Q.39
Mercury thermometer is commonly used for low temperature measruement. The freezing point and boiling point of mercury are respectively __________ °C.
- 39 and 350
- 51 and 439
- 79 and 395
- 10 and 425
Q.40
What is the dynamic error in a critically damped second order instrument for a ramp input (AT)?
0.5 AT
2 AT
√AT
1.5 AT
Q.41
Radiation pyrometers as compared to thermocouples
Has a slower speed of response
Can measure higher temperature
Can't measure the temperature of moving objects
Is more affected by corrosive atmosphere
Q.42
Liquid levels in autocalves are measued by
Simple float
Differential float type manometer
Glass gauge
None of these
Q.43
An amplitude ratio of 0.1 corresponds to __________ decibels.
20
-20
10
-10
Q.44
The __________ of a vapor pressure thermometer is a primary element.
Pointer
Bourdon tube
Bulb
None of these
Q.45
Polarisation of light forms the working principle of a
Polarimeter
Polarograph
Chromatograph
Spectrometer
Q.46
Thermal conductivity measurement com-prises the working principle of a
CO₂ analyser
Polarimeter
Spectrometer
Chromatograph
Q.47
Which of the following is a desirable characteristic of an instrument?
High drift
High fidelity
High measuring lag
Poor reproducibility
Q.48
__________ is the static characteristics of an instrument,
Response
Tine lag
Drift
Dynamic error
Q.49
Temperature control of an exothermic chemical reaction taking place in a CSTR is done with the help of cooling water flowing in a jacket around the reactor. The types of valve and controller action to be recommended are
Air to open valve with the controller direct acting
Air to close valve with the controller indirect acting
Air to open valve with the controller indirect acting
Air to close valve with the controller direct acting
Q.50
The temperature range for which copper resistance thermometer can be used is __________ °C
0 to 150
-200 to 150
350 to 750
500 to 900
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