Competitive Latest Chemical Engineering MCQs – Process Control And Instrumentation MCQs
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Latest Chemical Engineering MCQs
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Latest Process Control And Instrumentation Mcqs
The most occurred mcqs of Process Control And Instrumentation in past papers. Past papers of Mcqs. Past papers of Process Control And Instrumentation Mcqs . Mcqs are the necessary part of any competitive / job related exams. The Mcqs having specific numbers in any written test. It is therefore everyone have to learn / remember the related Process Control And Instrumentation Mcqs. The Important series of Process Control And Instrumentation Mcqs are given below:
Continuous shell temperature measurement in a liquid-liquid heat exchanger is done by a __________________?
A. Thermocouple
B. Mercury in glass thermometer
C. Resistance thermometer
D. Vapor pressure thermometer
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
Flow rate through an orifice is _____________ the pressure differential?
A. Inversely proportional to the square root of
B. Proportional to
C. Proportional to the square root of
D. Inversely proportional to the square of
Which of the following is not the triple point of water ?
A. 32°R
B. 492°R
C. 273°K
D. 32°F
Measurement of sub-zero Celsius temperature in industry is done most commonly by __________________?
A. Gas thermometers
B. Resistance thermometers
C. Thermocouples
D. Bi-metallic thermometers
Characteristic equation is the denominator of ____________ loop transfer function?
A. Open
B. Closed
C. Both of the above
D. Neither of the above
Smoke density of the flue gas going out of the chimney is measured by a __________________?
A. Thermal conductivity meter
B. Polarograph
C. Photo electric cell
D. Chromatograph
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/R) e-TdS/(Q/P) (S + 1)
B. (Q/P) e-(Q/R)S/(TdS + 1)
C. (Q/P) e-TdS/(Q/R) (S + 1)
D. (Q/R) e-(P/Q)S/(TdS + 1)
Mercury manometer (U-tube type) exemplifies a ______________ order system?
A. First
B. Zero
C. Second
D. Third
Liquid argon level in a pressurised storage tank (at 3 kg/cm2) is measured by a/an ____________________?
A. External float gage
B. Gage glass
C. Differential pressure gage
D. None of these
E.m.f. generated by thermocouples is of the order of ________________?
A. Milli volts
B. Volts
C. Micro volts
D. Kilo volts
The frequency response of a dynamic element shows a constant magnitude ratio at all frequencies. The element exhibits a negative phase shift at all frequencies. The absolute value of the phase shift increases linearly with frequency. The element has the transfer function ?
A. e-ηS
B. (T1S/(T2S + 1)
C. (T1S + 1)/(T2S + 1)
D. (T1S + 1)/(T2S
Paramagnetism method is not used for the composition determination of ______________ in gases?
A. Oxides of nitrogen
B. Oxygen
C. Carbon dioxide
D. Any of these
Suppose that the gain, time constant and dead time of a process with the following transfer function: Gc(s) = 10 exp( – 0.1s)/(0.5s + 1) are known with a possible error of ± 20% of their values. The largest permissible gain Kc of a proportional controller needs to be calculated below taking the values of process gain, time constant and dead time as________________?
A. 8, 0.6, 0.12
B. 12, 0.6, 0.12
C. 8, 0.6, 0.08
D. 12, 0.4, 0.08
Transfer function of transportation lag is___________________?
A. 1/(Ts + 1)
B. e-TS
C. eTS
D. None of these
An amplitude ratio of 0.1 corresponds to _____________ decibels?
A. 10
B. -20
C. 20
D. -10
Fluid Mechanics Mcqs
Emf developed by a thermocouple while measuring a temperature of 400°C is 22 mV. The type of thermocouple used is ___________________?
A. Platinum-rhodium
B. Iron-constantan
C. Chromel-alumel
D. Platinum-platinum + rhodium
What is the dynamic error in a critically damped second order instrument for a ramp input (At) ?
A. √(AT)
B. 2 AT
C. 0.5 AT
D. 1.5 AT
Which of the systems having the following transfer function is stable ?
A. 1/(S2 – 2S + 3)
B. 1/(S2 + 2)
C. 1/(S2 + 2S + 2)
D. exp (-20 S)/(S2 + 2S – 1)
Which of the following fluid flow measuring devices can measure the largest flow rate ?
A. Rotameter
B. V-notch
C. Orificemeter
D. Weir
The operation of a Rotameter is based on ________________?
A. Variable flow area
B. Pressure drop across a nozzle
C. Rotation of a turbine
D. Pressure at a stagnation point
The unit step response of the transfer function 1/(s2 + 2s + 3) _______________________?
A. Is overdamped
B. Has a damped oscillatory characteristics
C. Has a non-zero slope at the origin
D. Is unstable
Bode stability method uses ____________ loop transfer function?
A. Open
B. Closed
C. Either of the above
D. Neither of the above
For an input forcing function, X(t) = 2t2, the Laplace transform of this function is________________?
A. 4/s2
B. 2/s2
C. 2/s3
D. 4/s3
The deflection of the free end of the bimetallic strips in a bimetallic thermometer with temperature is nearly__________________?
A. Linear
B. Parabolic
C. Non-linear
D. Hyperbolic
Thermal conductivity cell is the primary element of a/an _____________ analyser?
A. Carbon monoxide
B. Carbon dioxide
C. Oxygen
D. Sulphur dioxide
The temperature of tempering oil baths maintained at 400°C during heat treatment of steel is measured by a/an _____________ thermocouple?
A. Platinum-platinum/rhodium
B. Iron-constantan
C. Chromel-alumel
D. None of these
Which of the following is not a mechanical pressure sensing element ?
A. Diaphragm
B. Bellows
C. Bourdon tube
D. U-tube
Working principle of bimetallic thermometers is difference in linear co-efficient of thermal expansion of two strips of different metals welded together. Which of the following has the maximum thermal co-efficient of linear expansion ?
A. Chromel
B. Brass
C. Nickel
D. Invar
Emf developed by a thermocouple, while measuring a temperature of 600°C is about 5.5 mV. The type of thermocouple used is_______________?
A. Iron-constantan
B. Chromel-alumel
C. Platinum-platinum + rhodium
D. Either A., B. or C.
Pressure of 0.0001 absolute psi can be measured by _____________ gauge?
A. Mcleod
B. Thermocouple
C. Pirani
D. None of these
Thermal wells used in temperature measurements should have __________________?
A. Low emissivity
B. Very thick walls
C. Polished surface
D. High transmissivity of radiation
The unit step response of the transfer function (2s – 1)/[(3s + 1) (4s + 1)] reaches its final steady state asymptotically after _____________?
A. A monotonic increase
B. Initially increasing and then decreasing
C. A monotonic decrease
D. Increasing decreasing and then increasing
A proportional controller with a gain of Kc is used to control a first order process. The offset will increase, if________________?
A. Integral control action is introduced
B. Kc is increased
C. Kc is reduced
D. Derivative control action is introduced
On-off controllers are normally used for________________?
A. Low loads
B. Flow rate changes
C. Temperature changes
D. None of these
A pyrheliometer is an instrument used for measuring the_________________?
A. Diffuse radiation
B. Beam radiation
C. Bright sunshine period
D. None of these
Which of the following temperature measuring instruments need not touch the object whose temperature is being measured ?
A. Radiation/infrared pyrometer
B. Mercury in glass thermometer
C. Filled system thermometer
D. Thermo electric pyrometer
In a shell and tube heat exchanger, the inlet temperature of heating/cooling fluid is the ____________ variable?
A. Load
B. Controlled
C. Manipulated
D. None of these
The ____________ of a vapor pressure thermometer is a secondary element ?
A. Bulb
B. Bourdon tube
C. Pointer
D. None of these
Thermistors are used in ____________ devices?
A. Voltage measuring
B. Temperature compensating
C. Temperature measuring
D. Both B. & C.
Thermistor, which has high temperature co-efficient of resistivity, is used as the sensing element in resistance thermometer. It is a/an ?
A. Conductor
B. Insulator
C. Solid semi-conductor
D. Liquid semi-conductor
The ____________ of the fluid contained in the temperature sensing element (i.e., bulb) of filled system thermometers changes with change in temperature ?
A. Volume
B. Pressure
C. Viscosity
D. All A., B. and C.
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. Poles of the closed loop transfer function should lie in the right half of the complex plane
D. Bode plots of the corresponding open loop transfer function should monotonically decrease
Which of the following thermocouples will give the highest output for the same value of hot and cold junction temperature ?
A. Iron-constantan
B. Platinum-platinum + rhodium
C. Chromel-constantan
D. All will give the same output
Use of I-control along with P-control facilitates ?
A. Elimination of offset
B. Reduction of stability time
C. Reduction of offset
D. None of these
Polarograph is meant for the analysis of __________________?
A. Miscible liquids
B. Gaseous mixture
C. Solids
D. Isotopes
Response of a system to a sinusoidal input is called _____________ response?
A. Unit step
B. Impulse
C. Frequency
D. None of these
Materials And Construction Mcqs
The characteristic equation for the control system with a closed loop transfer function G1/1 + G2 is given by 1 + G2 = 0. The characteristic equation for the control system_________________?
A. Determines its stability
B. Depends only upon the open loop transfer function
C. Is the same for set point or load changes
D. All A , B & C.
A mercury barometer measures the _____________ pressure?
A. Atmospheric
B. Vacuum
C. Gauge
D. Absolute
The root locus method, a pole of a transfer function G(s) is the value of s for which G(s) approaches ___________________?
A. 0
B. -1
C. 1
D. ∞
Strain gage pressure transducers are used to measure _____________ pressures?
A. Absolute as well as differential
B. Gage as well as vacuum
C. Both A. and B.
D. Neither A. nor B.
Starting temperature of optical radiation pyrometer is ______________ °C?
A. 800
B. 1200
C. 400
D. 1500
Emission spectroscopy is used for__________________?
A. Solids and metal analysis
B. Determination of CO2 in gases
C. Determining water purity
D. NOx determination
Which of the systems having following transfer functions is stable ?
A. 1/(s2 – 2s + 3)
B. 1/(s2 + 2)
C. 1/(s2 + 2s + 2)
D. exp (-20s)/(s2 + 2s – 1)
The response of two tanks of same size and resistance in series is __________________?
A. Over damped
B. Critically damped
C. Under damped
D. None of the above
Working principle of radiation pyrometer is based on the ________________?
A. Kirchoff’s law
B. Wien’s law
C. Stefan-Boltzmann law
D. Seebeck effect
Which of the following is a desirable characteristic of an instrument ?
A. High measuring lag
B. High fidelity
C. High drift
D. Poor reproducibility
Out of the following temperature measuring instruments, the measurement accuracy will be minimum for the ________________?
A. Iron-constantan thermocouple
B. Optical pyrometer
C. Mercury in glass thermometer
D. Alcohol filled thermometer
Liquid discharge from a tank or reservoir cannot be measured by __________________?
A. Orificemeter
B. Mouthpieces
C. Weirs
D. Notches
Which of the following relates the emf. generated in a single homogeneous wire to the temperature difference ?
A. Seebeck effect
B. Thomson effect
C. Peltier effect
D. None of these
Compositional analysis of ______________ is done using mass spectrometer?
A. An isotope
B. A solid
C. Natural gas
D. An alloy
______________ controller has the maximum stabilising time?
A. PD
B. P
C. PI
D. PID
Which of the following judges the accuracy of an instrument ?
A. Drift
B. Dead zone
C. Static error
D. None of these
Flapper nozzle is used in a/an ______________ controller?
A. Hydraulic
B. Electronic
C. Pneumatic
D. None of these
Thermal conductivity measurement is used for the determination of________________?
A. Specific gravity of petrofuels
B. O2 percentage in the flue gas
C. Composition of an alloy
D. CO2 percentage in the flue gas
Continuous measurement of moisture in paper is done by_______________?
A. Hair-hygrometer
B. Sling psychrometer
C. Weighing
D. High resistance Wheatstone bridge circuit
Process Control And Instrumentation Mcqs
Temperature measuring instruments are standardised mostly with _____________ points of pure substances?
A. Boiling
B. Melting
C. Both A. & B.
D. Neither A. nor B.
Flow rate of sludge is not measured by a/an_________________?
A. Orificemeter
B. Kennison nozzle
C. Open weir
D. Both B. & C.
Pressure of 0.01 psi (absolute) can be measured by ______________ gauge?
A. Pirani
B. Ionisation
C. Mcleod
D. None of these
A simple pitot tube measures the___________________?
A. Maximum velocity
B. Average velocity
C. Point velocity
D. Static pressure
The amplitude ratio for the sinusoidal response of __________ is < 1?
A. Second order system
B. First order system
C. Transportation lag
D. None of these
Volumetric expansion is the working principle of the ______________ thermometers?
A. Mercury in glass
B. Vapor pressure
C. Constant volume gas
D. Bimetallic
Zirconia probe is used for the measurement of___________________?
A. % CO2 in flue gas
B. Humidity of air
C. % O2 in flue gas
D. Speed of a submarine
Pirani gauge is used for the measurement of________________?
A. Liquid level under pressure
B. High vacuum
C. Very high pressure
D. Liquid level at atmospheric pressure
The _____________ of a vapor pressure thermometer is a functioning element?
A. Pointer
B. Bulb
C. Bourdon tube
D. None of these
Which of the following is not a second order instrument ?
A. Pressure gauge with one bellow, two tubes and a tank
B. Bare mercury in glass thermometer
C. Mercury in glass thermometer with covering
D. None of these
Which of the following is a ‘contact’ pyrometer ?
A. Resistance pyrometer
B. Radiation pyrometer
C. Optical pyrometer
D. Infra red pyrometer
Thermal conductivity measurement com-prises the working principle of a_________________?
A. CO2 analyser
B. Spectrometer
C. Polarimeter
D. Chromatograph
Process degree of freedom indicates _______________ number of controllers to be used?
A. The maximum
B. Both maximum and the minimum
C. The minimum
D. Nothing about the
Pick out the wrong statement ?
A. Paramagnetic susceptibility of gases decreases with temperature
B. CO2 is the strongest paramagnetic gas
C. O2, NO and NO2 exhibit paramagnetic properties as a result of unpaired electrons
D. Paramagnetic susceptibility of gases permits the measurement of their concentration
____________ is the static characteristics of an instrument?
A. Tine lag
B. Response
C. Drift
D. Dynamic error
High temperature of around 2000°C of incandescent gas mantles is measured by a/an __________________?
A. Optical pyrometer
B. Specially designed thermocouple
C. Radiation pyrometer
D. None of these
Zirconia probe is used for the continuous measurement of ______________ flue gases going out of the furnace?
A. Oxygen in
B. Carbon monoxide in
C. Carbon dioxide in
D. Temperature of
Which of following error integral is considered as the best criterion in controller settings ?
A. ∫0 ∞ |e2| dt
B. ∫0 ∞ |e| dt
C. ∫0 ∞ e2 dt
D. None of these
The amplitude ratio for the sinusoidal response of a _____________ is 1?
A. Second order system
B. First order system
C. Transportation lag
D. None of these
Which of the following is the dynamic characteristics of an instrument ?
A. Reproducibility
B. Dead zone
C. Sensitivity
D. Fidelity
Liquid levels in autoclaves are measured by ________________?
A. Glass gauge
B. Differential float type manometer
C. Simple float
D. None of these
For increased speed of response of an expansion pressure spring thermometer, the thermometer bulb should have a__________________?
A. High thermal conductivity
B. Large area but small mass
C. Small specific heat
D. All A , B & C
Which of the following controllers has the least maximum deviation ?
A. P-I controller
B. P-controller
C. P-I-D controller
D. P-D controller
Out of the following thermocouple wire insulating material, the highest temperature rating is for________________?
A. Asbestos
B. Ceramic fibre
C. Teflon
D. Fibre glass
Turbine flow meters are suitable for_________________?
A. Very limited flow ranges
B. Aerospace and in air borne applications
C. Cryogenic flow measurements
D. Both B. and C.
Load cells are used for the measurement of __________________?
A. Strain
B. Weight
C. Stress
D. Velocity
Gas analysis is commonly done using the___________________?
A. Thermal conductivity cell
B. Mass spectrometer
C. X-ray diffraction
D. Emission spectrometer
Stalagmometer is used for the measurement of__________________?
A. Refractive index
B. Surface tension
C. Kinematic viscosity
D. Optical activity
The transfer function for a PID controller is (where, η i is the integral (reset) time and ηD is the derivative time.) ?
A. Kc(1 + ηis + (1/ηD . s)
B. Kc[1 + (1/ηis) + ηD . s)
C. Kc(1 + ηis + ηD ). s
D. None of these
Polarisation of light forms the working principle of a______________?
A. Polarimeter
B. Chromatograph
C. Polarograph
D. Spectrometer
____________ are analysed using a Polarograph?
A. Liquids
B. Solids
C. Isotonic solutions
D. Gases
Dilute wine was used as a thermometric liquid initially to develop temperature scale. First empirical temperature scale developed was the _____________ scale?
A. Centigrade
B. Kelvin
C. Fahrenheit
D. Reaumer
The open loop transfer function of a control system is KR/(1 + TS). This represents ______________?
A. A first order system
B. A first order time lag
C. Dead time system
D. A second order system
The term analogous to the electrical current in a thermal system is the_________________?
A. Heat content in the system
B. Heat flow rate
C. Temperature difference
D. None of these