Quiz on pressure measurement Welcome to your Quiz on pressure measurement Name Email When visual indication of pressure level is required then the instrument generally used in .......... Manometers Diaphragm sensors Bourdon tube Resonant wire device In McLeood gauge_________. High pressure fluid is expanded to a low pressure which is read by the manometer technique Low pressure fluid is compressed to a high pressure which is read by the bourdon technique High pressure fluid is expanded to a low pressure which is read by the bourdon technique Low pressure fluid is compressed to a high pressure which is read by the manometer technique How much the value of atmospheric pressure gauge? 14.7psi 20.7psi 30.8psi 40.0psi Load cells are used for the the measurement of ________. Velocity Weight Stress Strain What are common transmitter output signals? 0 to 24 vdc Frequency modulated 4-20 ma analog 10-50 vdc A pressure transmitter has a range of 0 to 100%, what is the output at 40%? 10.40 ma 10.56 ma 10.46 ma 10.76 ma Process pressure is transmitted for sensing diaphragms through________. Isolation diaphragm Sensing diaphragm Isolating diaphragm and silicon oil None of them What is the difference between URV and LRV? Span Accuracy Both of them None of these If 1 bar=14.5 psi then 100 mbar=________ 1450psi 145psi 1.45psi 0.145psi A capacitive pressure transmitter indicates changes in pressure by changes in pressure by changing the ____. Voltage output of an AC circuit Frequency Capacitance Resistance The HART communicator can interface with pressure transmitter from_____. Control room Field instrument site Any wiring termination point in the loop All of the above What will you do if transmitter is not communicating with the communicator Check power supply voltage in transmitter Check load resistance Both of them None of these What is absolute pressure? Gauge pressure Atmosphere pressure System pressure None of them What is the value of atmospheric pressure? 860 mmhg 720 mmhg 760 mmhg 900 mmhg What is the gauge pressure? Atmosphere pressure - System pressure Atmosphere pressure + System pressure System pressure None of these What is vacuum pressure? Above atmosphere pressure Above gauge pressure Below than atmosphere pressure None of them What is the maximum vacuum? 860 mmhg 720 mmhg 760 mmhg 900 mmhg Metals used in bourdon tubes should not undergo____. Fatigue Hysterisis Creep All of the above A capsule diaphragm is made by welding two diaphragm_____. To a solid base Together around the edge Together at the centre To two other diaphragm Dead weight tester is used for _____. Testing dead weights Measuring process pressure Calibrating pressure instruments None of these One torr is equal to ___. 1 mmhg 1 inch hg 1 atmosphere 1 kilopascal Which gauge measures pressure by sensing changes in the thermal conductivity of a gas? Mcleod gauge Pirani gauge Strain gauge None of them Diaphragm used in pressure application are__________. Light Small in size Slack Bimetallic Mcleod gauges pressure can measure pressure as low as____. 0.05 torr 0.005 torr 0.0005 torr 0.00005 torr What type of manometer is best for measuring low pressure? Well manometer Inclined manometer U-tube manometer Multiple tube In calibrating a pressure instrument we first adjust its______. Span Zero Linearity Output Which is used for measuring the low pressure? Bourdon tube Bellows Capsule gauge Mcleod gauge On which principle an ionization gauge works? Pascal law Boyle's law Bernoulli's theorem None of these Which is used for measurement the atmospheric pressure? Barometer Vacuum gauge Hydrometer Bourdon tube Why siphons are installed between gauge and process connection in steam line? To prevent the live steam Reduce sudden pressure shock Both (a) and (b) none of these Which is used to prevent the corrosion of any instrument due to process? Siphons Steam tracing Pressure repeaters None of these Which of the following is not a pressure sensing element? Diaphragm Bourdon tube Manometer Orifice plate In a DP transmitter the pressure increase in LP side and remains steady in HP side, what changes will come in output ? Increase Decrease Remain same All of the above Hysteresis error in bourdon tube can be minimized by Using in design pressure range Using proper tube material Avoiding temperature cycling all of these What is used in pressure gauge to free the system from backlash? Adjustable link Hair spring Segment lever None of t hem In capsule gauge, capsule made of beryllium copper? True False Which gauge is used to measure the density of gas? Pirani gauge Ionization gauge Thermocouple gauge Mcleod gauge On which principle dead weight tester work? Pascal law Bernoulli theorem Kirchhoff's law Boyle's alw Strain gauge is a passive type resistance pressure transducer. True False The capacitance of a parallel plate capacitor is proportional to the space between the plates. True False What ia another name of servo pressure transducer? Force balance pressure transducer Reluctance pressure transducer Capacitance pressure transducer None of the above Piezoelectric transducer can be used for measurement the .............. Pressure Temperature Level Flow Which contact selection you used in high pressure switch , in healthy process condition contact should be closed? Common and NC Common and NO NO and NC None of the above Which of the following manometer has highest sensitivity? U-tube with water U-tube manometer Inclined U-tube manometer Micro manometer with water The resultant upward pressure of the fluid on an immersed body due to its tendency to uplift the sub merged body is called Attraction Reaction Up thrust Buoyancy What is the value of absolute pressure( napprox) if gauge pressure is 195 psi? 178psi 164psi 210psi 151psi What is the absolute pressure if a vacuum gauge read 11.5 psig and the atmospheric pressure is 14.6 psia? -3.1 psia +2.61 psia +3.1 psia -2.61 psia A pressure transmitter has a span of 0-100 psi. If current reading is 60 psi pressure and accuracy of transmitter is +/-0.75% of reading then what is possible pressure? 59.0 to 61 psi 59.5 to 60.5 psi 59.55 to 60.45 psi 60 to 61 psi What is one Pascal equivalent to ______. 10 N/M3 1 N/M2 1N/M3 10 N/M2 Which pressure instrument use to predict weather ? Anemometer Pressure gauge Barometer Thermometer A smart type pressure transmitter range is 0-80 kg/cm2. How much mA comes at 35 kg/cm2? 11 mA 10 mA 12 mA 14 mA A smart type pressure transmitter range -25 to +25 mmwc. How much mA comes at -10 mmwc 8.6 mA 8.4 mA 8.0 mA 8.8 mA Pirani gauge is used for the measurement of _______ . Very high pressure Very low pressure High vacuum None of them Bellows is made of which material ________ . Iron Paper Thin copper sheet Plastic Non-metallic diaphragm used as pressure sensor in instruments is generally made of____. Synthetic rubber Teflon Thick paper All of the above How much psi is in 1 kg/cm2? 14.7 psi 14.22 psi 14.5 psi 15.0 psi How much mmH2o is in one kg/cm2? 10000 mmH2o 100 mmH2o 1000 mmH2o 10 mmH2o What is the purpose of pig tail used in pressure gauge? For protection from hot process medium For accuracy For protect from shock from sudden process None of these How much psi is in 1 atmospheric pressure? 14.7 psi 14.22 psi 14.5 psi 15.0 psi How much psi is in 1 bar? 14.7 psi 14.22 psi 14.5 psi 15.0 psi Strain gauge is used for the measurement of ______. Composition Liquid level Pressure Flow Maximum difference pressure in liquid manometer is 50 psi 30 psi 40 psi 20 psi Which of the following is a special feature in a pneumatic differential pressure sensor / transmitter? DP cell diaphragm Low pressure inlet High pressure inlet Feedback bellows Time's up
