Competitive Latest Chemical Engineering MCQs – Process Control And Instrumentation MCQs

Competitive Latest Chemical Engineering MCQs – Process Control And Instrumentation MCQs

This post is comprising of latest ” Process Control And Instrumentation MCQs – Latest Competitive Chemical Engineering MCQs “. Here you’ll get latest mechanical engineering mcqs for written test, interview with answers. If you want to improve your knowledge regarding mechanical engineering then read these mcqs of Design of Steel Structures.

Latest Chemical Engineering MCQs

By practicing these MCQs of Chemical Process Control And Instrumentation MCQs – Latest Competitive Chemical Engineering MCQs , an individual for exams performs better than before. This post comprising of mechanical engineering objective questions and answers related to Process Control And Instrumentation Mcqs “. As wise people believe “Perfect Practice make a Man Perfect”. It is therefore practice these mcqs of mechanical engineering to approach the success. Tab this page to check “Chemical Process Control And Instrumentation Mcqs” for the preparation of competitive mcqs, FPSC mcqs, PPSC mcqs, SPSC mcqs, KPPSC mcqs, AJKPSC mcqs, BPSC mcqs, NTS mcqs, PTS mcqs, OTS mcqs, Atomic Energy mcqs, Pak Army mcqs, Pak Navy mcqs, CTS mcqs, ETEA mcqs and others.

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

Competitive Latest Chemical Engineering MCQs – Process Control And Instrumentation MCQs

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