Latest Process Control And Instrumentation MCQs Competitive – New Latest Chemical Engineering 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:
A bolometer is __________________?
A. An element which senses optical input and delivers thermal output
B. Used for the measurement of thermal radiation
C. Both A. & B.
D. Neither A. nor B.
The time constant of a first order process with resistance R and capacitance C is__________________?
A. R – C
B. R + C
C. RC
D. 1/RC
Very low pressure is expressed in microns (μ), which is equal to ____________ mm of Hg column (absolute) at 0°C?
A. 0.01
B. 0.001
C. 0.0001
D. 0.1
What is the overall transfer function (C/R) of the following block diagram if G = G1. G2. G3 and H = H1.H2 ?
A. H/(1 + GH)
B. G/(1 + GH)
C. 1/(1 + GH)
D. G/(1 – GH)
Working principle of mercury in glass thermometer is based on the ______________ of mercury with increase in temperature?
A. Increase of thermal conductivity
B. Increase of pressure
C. Volumetric expansion
D. Differential linear expansion
Change of angle of refraction with composition comprises the working principle of a___________________?
A. Polarograph
B. Polarimeter
C. Spectrometer
D. Refractometer
Mcleod gauge is used to measure the __________________?
A. Flow rate
B. Point velocity
C. Vacuum
D. Pressure
A non-linear system will have _____________ steady state values?
A. Two
B. More than one
C. One
D. Three
On-off control which is a special case of proportional control, has a band width of about _____________ percent?
A. 75
B. 100
C. 25
D. 0
In a feed-back control system G and H denote open loop and close loop transfer functions respectively. The output-input relationship is_____________?
A. G/H
B. H/(1 + G)
C. G/(1 + H)
D. H/G
Nitrogen gas constant volume thermometer is suitable for measuring a temperature of _____________ °C?
A. < 0
B. 0-100
C. > 100
D. > 50
Mercury thermometer can be used to measure the temperature upto ____________ °C?
A. 250
B. 100
C. 350
D. 750
The Laplace transform of exp(at), where a > 0, is defined only for the Laplace parameter, s > a since______________?
A. The function exp(at) is piece-wise continuous only for s > a
B. The Laplace transform of integral of exp(at) has finite values only for s > a
C. The Laplace transform integral of exp(at) has initial values only for s > a
D. The function is exponential
Temperature of _____________ cannot be measured by an optical or radiation pyrometer?
A. Hot blast (air) from stoves
B. Combustion space in boilers
C. Molten slag flowing out of blast furnace
D. Rotary limestone calcination kiln
Platinum resistance thermometer can be used upto antimony point which is ____________ °C, and is the temperature of equilibrium between solid antimony & liquid antimony at normal atmospheric pressure?
A. 1064.43
B. 630.74
C. 961.93
D. 1261.93
Which of the following thermocouples has the least temperature measurement range ?
A. Copper-constantan
B. Iron-constantan
C. Platinum-platinum/rhodium
D. Chromel-alumel
Radiation thermometer cannot measure the temperature ___________________?
A. Of an object without coming in contact with it
B. Inside a pressure vessel
C. Of liquid oxygen
D. Of moving objects at high temperature
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)]
A pyranometer is an instrument used for measuring the___________________?
A. Bright sunshine period
B. Global radiation
C. Beam radiation
D. None of these
Materials And Construction Mcqs
Thermistors are made of__________________?
A. Iron-copper alloys
B. Metal oxides
C. Ultra pure metals
D. Nickel-chromium alloys
Stabilising time for the controllers is the time required for the response to reach _____________ percent of its ultimate value?
A. 87.5
B. 63.2
C. 95
D. 100
The initial value (t = 0) of the unit step response of the transfer function [(s + 1)/(2s + 1)] is__________________?
A. 1
B. ½
C. 0
D. 2
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. Using steel tube in place of glass tube
C. Increasing the diameter of the tube
D. Accounting for the tube expansion
Find the ultimate gain and frequency for a proportional controller in the case of a process having the transfer function Gp(s) = 1/(4s + 1)(2s + 1)(s + 1) ?
A. w = 1, Kc = 13
B. w = √(7/6), Kc = 46/3
C. w = 1/√14, Kc = 45/7 √14
D. w = √(7/8), Kc = 45/4
The transfer function of a first order system is______________?
A. 1/(Ts + 1)
B. s/(Ts + 1)
C. 1/Ts
D. None of these
Identify an unbounded input from inputs whose transfer functions are given below______________?
A. 1/S
B. 1
C. 1/S2
D. 1/(S2 + 1)
In a single tank system, the transfer function of _____________ to inlet flow rate is 1/(TS+1)?
A. Outlet flow rate
B. Level
C. Both of the above
D. Neither of the above
Bode diagram are generated from output response of the system subjected to which of the following input ?
A. Step
B. Impulse
C. Ramp
D. Sinusoidal
Which of the following does not figure in the list of seven substances selected for international temperature scale ?
A. Oxygen and sulphur (B.P)
B. Ice (F.P) and steam (B.P)
C. Antimony and silver (F.P)
D. Zinc (B.P) and mercury (F.P)
The frequency response of a first order system, has a phase shift with lower and upper bounds given by________________?
A. -π/2, π/2
B. – ∞, π/2
C. -π/2, 0
D. 0, π/2
A photo electric device in which the resistance of the metal is directly proportional to the light striking on it, is known as photo-conductive cell. Photoelectric transducers are used for the measurement of those parameters, which can be used to produce variation in_______________?
A. Light intensity
B. Flux density
C. Current
D. Voltage
A barometer measures the _____________ pressure?
A. Absolute
B. dynamic
C. Absolute as well as gauge
D. Gauge
A sinusoidal variation in the input passing through a linear first order system _________________?
A. Gets amplified (magnitude increases)
B. Becomes less oscillatory (frequency decreases)
C. Becomes more oscillatory (frequency increases)
D. Gets attenuated (magnitude decreases)
The inverse Laplace transform of the function f(S) = 1/S (1 + S) is_________________?
A. 1 – et
B. 1 + et
C. 1 + e-t
D. 1 – e-t
Composition of alloys can be determined by _________________?
A. Polarograph
B. Refractometer
C. Chromatograph
D. None of these
Measurement of pressure in ammonia reactor is done by __________________?
A. Bourdon gauge
B. Inclined tube manometer
C. U-tube manometer
D. Pirani gauge
A constant volume gas thermometer employing ______________ is used to measure sub-zero (i.e., < 0°C) temperature?
A. Helium
B. Nitrogen
C. Hydrogen
D. None of these
Concentration of sugar solution can be determined by the__________________?
A. Polarimetry
B. Emission spectroscopy
C. Flame photometry
D. Oscillometry
Vapour actuated pressure spring thermometer does not require ambient temperature compensation. Ambient temperature compensation is provided in gas or liquid expansion pressure spring thermometer by__________________?
A. Reducing the volume of the capillary to a minimum
B. Making the volume of thermometer bulb as large as conveniently possible
C. Reducing the volume of the receiving element to a minimum
D. All A , B & C.
Gas chromatography is used for the measurement of ________________?
A. Pressure
B. Temperature
C. Concentration
D. Flow rate
Fluid Mechanics Mcqs
A system with a double pole at the origin is unstable since the corresponding term in the time domain________________?
A. Grows exponentially with time
B. Is a constant
C. Grows linearly with time
D. Decays linearly with time
Working principle of disappearing filament type optical pyrometer is based on the ________________?
A. Wien’s law
B. Kirchoff’s law
C. Seebeck effect
D. Peltier effect
Dilatometer is used to measure __________________?
A. Strain
B. Stress
C. Deflection
D. Contraction/expansion due to changes in temperature
Relationship between absorption/evolution of heat at the thermocouple junctions and the current flow in the circuit is given by _____________ effect?
A. Peltier
B. Seebeck
C. Thomson
D. None of these
pH meter has ____________________?
A. Three cells
B. Two cells
C. One cell
D. No cell
Flow rate of those fluids which are insensitive to changes in their density, viscosity or flow velocity profile can be best measured by a ________________?
A. Magnetic flowmeter
B. Flow nozzle type flowmeter
C. Pitot tube
D. Turbine flowmeter
Working principle of mercury in glass thermometer is based on volumetric expansion of mercury with increase in temperature. Which of the following undergoes minimum volumetric expansion for a given temperature change ?
A. Methyl alcohol
B. Mercury
C. Water
D. Carbon-tetrachloride
Which of the following filled system expansion thermometer has the capability to measure the lowest temperature ?
A. Mercury in steel thermometer
B. Mercury in glass thermometer
C. Alcohol in glass thermometer
D. Fused metal (Na or K) in steel thermometer
Emf generated in a thermocouple depends on the temperature ___________________?
A. Of hot junction only
B. Of cold junction only
C. Difference between hot and cold junctions
D. Difference between cold junction and atmospheric temperature
Which of the following thermocouples can measure the maximum temperature ?
A. Chromel-alumel
B. Tungsten-molybdenum
C. Platinum-rhodium
D. Iron-constantan
Optical activity of a solution can be determined using a ___________________?
A. Polarimeter
B. Dilatometer
C. Polarograph
D. Refractometer
Strain gage uses an electrical conductor wire, which when elastically stretched increases in length and reduces in diameter. Both these dimensional changes result in ____________ in the electrical resistance of the wire ?
A. Decrease
B. No change
C. Increase
D. Exponential decrease
Which of the following is not a composition measuring instrument ?
A. Mass spectrometer
B. Thermal conductivity cell
C. Polarograph
D. Hot wire anemometer
Response of a linear control system for a change in set point is called __________________?
A. Transient response
B. Frequency response
C. Servo problem
D. Regulator problem
Stroboscope is used for the measurement of _________________?
A. Rpm of a flywheel
B. Depression of freezing point
C. Frequency of light
D. Liquid level under pressure
Nickel percentage in invar which is an iron-nickel alloy, and is used as a thermocouple material is __________________?
A. 54
B. 36
C. 12
D. 68
Conversion formula for converting amplitude ratio (AR) into decibels is ________________?
A. Decibel = 20 log10 (AR)
B. Decibel = 20 log10 (AR)0.5
C. Decibel = 20 loge (AR)
D. Decibel = 20 loge (AR)0.5
Liquid flow rate in an open channel cannot be measured by a/an __________________?
A. Orifice meter
B. Rectangular weir
C. Cipolletti weir
D. V-notch
Temperature of molten pig iron (1450°C) and molten slag (1500°C) flowing out of a blast furnace is measured by a/an_______________?
A. Chromel-alumel thermocouple
B. Radiation pyrometer
C. Optical pyrometer
D. Either B. or C.
Plant-Economics Mcqs
Which of the following is never used as an element of industrial resistance thermometer ?
A. Lead
B. Copper
C. Nickel
D. 30% iron + 70% nickel
Emf developed by a thermocouple while measuring a temperature of 800°C is about 31 mV. The type of thermocouple used is________________?
A. Chromel-alumel
B. Platinum-platinum + rhodium
C. Iron-constantan
D. None of these
Hot wire anemometer is used for the measurement of___________________?
A. Flow rates of fluids
B. Very high temperature
C. Flow rates of granular solids
D. Thermal conductivity of gases
Phase lag of the sinusoidal response of a first order system is _________________?
A. 30°
B. 120°
C. 180°
D. 90°
When the damping co-efficient (ξ) is unity, the system is __________________?
A. Underdamped
B. Critically damped
C. Overdamped
D. Highly fluctuating
A system with transfer function [(2S/4S) + 1] is of _____________ order?
A. 2nd
B. 1st
C. Zero
D. 3rd
Flow rate measurement of hostile acids and alkalis can be most suitably done by a/an ________________?
A. Orificemeter
B. Venturimeter
C. Magnetic flow meter
D. Hot wire anemometer
Platinum resistance thermometer is the international standard for temperature measurement between __________________?
A. 13.81°K to 903.9°K
B. Triple point of hydrogen and freezing point of antimony
C. Both A. and B.
D. Neither A. nor B.
Which of the following thermocouple materials does not contain nickel ?
A. Chromel
B. Alumel
C. Constantan
D. None of these
To increase the speed of response of a pressure spring liquid or gas expansion thermometer, the clearance space between the thermometer bulb and the thermal well should not be filled with ________________?
A. Air
B. A metal powder or graphite
C. Mercury
D. Oil
Specific gravity of a liquid cannot be measured by a/an __________________?
A. Anemometer
B. Specific gravity bottle
C. Hydrometer
D. Pycnometer
Mass spectrometer is used for the composition analysis of____________________?
A. Solids
B. Alloys
C. Isotopes
D. None of these
The ______________ of a vapor pressure thermometer is a primary element?
A. Bourdon tube
B. Pointer
C. Bulb
D. None of these
Helium gas constant volume thermometer is suitable for the measurement of a temperature of ______________ °C?
A. > 0
B. < 0
C. < 100
D. > 800
Flow rate of a river is measured by a/an____________________?
A. Kennison nozzle
B. Vane meter
C. Pitot tube
D. Open weir
Thermal conductivity based continuous flue gas analyser makes use of varying thermal conductivity of the constituents of flue gases. Which of the following constituents of flue gases has the maximum thermal conductivity ?
A. CO2
B. O2
C. N2
D. CO
Which of the following thermometers is not suitable for distant reading upto 60 metres ?
A. Resistance thermometer
B. Mercury in glass thermometer
C. Constant volume gas thermometer
D. Vapor pressure thermometer
The transfer function of a second order system is _____________________?
A. 1/(T2s2 + 2ξTs + 1)
B. 1/(T2s2 + 2ξT + 1)
C. 1/(T2s2 + 2Ts + 1)
D. None of these
Range of hydrogen gas constant volume thermometer is _____________ °C?
A. 100 – 500
B. 0 to 100
C. -10 to 20
D. 400 – 1000
In an exothermic chemical reactor, the manipulated variable is the flow rate of_______________?
A. Coolant
B. Product
C. Reactants
D. None of these
Which of the following thermocouples is the most suitable for measuring a temperature of about 1600°C in an oxidizing atmosphere ?
A. Platinum-platinum + rhodium
B. Copper-constantan
C. Iron-constantan
D. Chromel-alumel
Temperature measurement by optical pyrometer is done above ____________ point, which is 1063°C ?
A. Silver
B. Gold
C. Antimony
D. Nickel
Degree to which an instrument indicates the changes in measured variable without dynamic error is called its ___________________?
A. Reproducibility
B. Speed of response
C. Fidelity
D. Static characteristics
Resistance of a gas in a vessel is given by (where, P = pressure, V = volume of the vessel, n = no. of moles of the gas, R = gas constant) ?
A. V/nRT
B. nRT/P
C. nRT/V
D. P/nRT
Which of the following is not a differential pressure flow meter ?
A. Rotameter
B. Orificemeter
C. Flow nozzle
D. Venturimeter
____________ stability method uses open loop transfer function?
A. Nyquist
B. Ruth
C. Mikhailov
D. None of these
The unit of ‘time constant’ of a system is the same as that of___________________?
A. (Time)-1
B. Time
C. Velocity
D. None of these
An aneroid barometer measures the _____________ pressure?
A. Vacuum
B. Absolute
C. Atmospheric
D. Gage
What is the Laplace transform of impulse input having magnitude „X‟ ?
A. X2
B. X
C. 1/X
D. 1
The offset introduced by proportional controller with gain Kc in response of first order system can be reduced by ____________________?
A. Introducing derivative control
B. Introducing integral control
C. Reducing value of Kc
D. None of the above
Which of the following is not a variable area flow meter ?
A. Rotameter
B. Piston type meter
C. Magnetic flow meter
D. Orifice and tapered plug meter
Configuration of Bourdon spring tube is never made of _____________ shape?
A. Circular
B. Helical
C. Semi-circular
D. Spiral
Nichol’s chart deals with __________________?
A. A.R. vs. phase lag of second order
B. A.R. vs. phase lag of first order
C. Closed loop values vs. open loop values
D. Frequency response values of controllers
The deflection in diaphragm (which is used as pressure sensor in pneumatic and electronic instruments) is dependent on the metal thickness, its diameter D. and shape & number of corrugations. Its deflection is proportional to_______________?
A. d
B. d3
C. d2
D. d4
In a shell and tube heat exchanger, the flow rate of heating/cooling fluid is the ______________ variable?
A. Controlled
B. Load
C. Manipulated
D. None of these
Reset rate is the another term used for ____________ time?
A. Derivative
B. Integral
C. Dead
D. None of these
Positioning controllers are used for _______________?
A. Temperature changes
B. Low loads
C. High loads
D. Flow rate changes
Operating range of a temperature measuring instrument is 800 to 1600°C. It could be a/an _____________ pyrometer?
A. Optical
B. Radiation
C. Photoelectric
D. None of these
A bimetallic thermometer as compared to industrial mercury in glass thermometer has almost the same_________________?
A. Temperature measuring range (- 40°C to 450°C)
B. Speed of response
C. Accuracy (± 1% of span)
D. All a, b & c
The maximum service temperature for fibre glass used as thermocouple wire insulation material is __________ °C?
A. 250
B. 500
C. 1000
D. 750
Time constant is the __________________?
A. Time taken by the controlled variable to reach 63.2% of its full change
B. Same as dead time
C. Same as transportation lag
D. Time required by the measured variable to reach 63.2% of its ultimate change