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1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q21 ⇒ Which of the following device is used as a standard for calibrating pressure gauges : dead weight pressure tester [other wrong options] [Discuss in forum] manometer diaphragm bellows piezoelectric crystal. |
Q22 ⇒ Which gauge can be used to measure pressure below 1 |xm : ionization gauge [other wrong options] [Discuss in forum] dead weight tester pirani gauge McLeod gauge absolute pressure sensor. |
Q23 ⇒ Which is not correct statement about selection of tube material for a Bourdon gauge: Have high creep strength to withstand high temperature [other wrong options] [Discuss in forum] Be stable enough to maintain its calibration indefinitely Be immune to corrosion from the fluid inside the tube, and from the atmosphere outside it Be hard enough to withstand the applied pressure without any part of it being stressed above the limit of proportionality Be easy to fabricate. |
Q24 ⇒ Hysteresis error in Bourdon tube can be minimized by : using it well within the designed pressure range [other wrong options] [Discuss in forum] using proper tube material using proper diameter and thickness of tube avoiding temperature cycling using separating diaphragm and avoid direct ingress of hot. fluid to tube |
Q25 ⇒ Pick up false statement about pressure measurements : absolute pressure by piezoelectric crystal. [other wrong options] [Discuss in forum] low pressure is normally measured by manometers medium pressure by diaphragms or bellows medium and high pressure by Bourdon gauge all pressures by transducers |
Q26 ⇒ Pressure gauges are never connected directly to live steam because : the tubes or bellows which operate them would be overheated, causing serious error and damage [other wrong options] [Discuss in forum] steam if leaks, can cause serious injuries to operators entry of steam would cause static head error parts of pressure gauge can't withstand temperature of steam pressure gauges are not calibrated to measure steam pressure directly. |
Q27 ⇒ A siphon or loop in the connecting pipe is interposed as close as possible to the pressure gauge so that: steam can condense to form a seal of water to fill the tube or bellows at the pressure being measured [other wrong options] [Discuss in forum] air or vapour collection is avoided moisture formed in pipe can be drained static head errors are eliminated it acts as dampener and does not pass on pressure variations to sensor. |
Q28 ⇒ When the pressure medium to be measured is air or gas, the pipe is made to rise continuously to the gauge, so that: any moisture can be drained ' [other wrong options] [Discuss in forum] no air or vapour can collect in pipe moisture does not come in contact with elements of sensor/gauge moisture can condense to form seal of water static head error due to moisture is eliminated. |
Q29 ⇒ Ring balance gauge is used for measurement of: differential pressure [other wrong options] [Discuss in forum] absolute pressure vacuum temperature gauge pressure. |
Q30 ⇒ The deflection of center of capsule (formed by circumferential welding of two diaphragms) is proportional to : D4 [other wrong options] [Discuss in forum] active diameter of diaphragm (D) D D2 D3 |
Q31 ⇒ The development of following element has improved the reliability and the response action of low pressure gauges : capsule [other wrong options] [Discuss in forum] diaphragm bourdon ring balance all of the above. |
Q32 ⇒ Proving rings are used to measure : force [other wrong options] [Discuss in forum] displacement velocity acceleration shock. |
Q33 ⇒ Which is not correct about load cells used to measure weight/force : low resistance to side load and low overload withstand [other wrong options] [Discuss in forum] accuracy of the order of 0.01 to 1% rugged and compact construction no moving parts and negligible deflection under load hermetically sealed and thermal compensation. |
Q34 ⇒ Which type of device is suitable for dynamic force measurement: piezo-electric transducer [other wrong options] [Discuss in forum] lever balance spring balance proving ring all of the above. |
Q35 ⇒ 5. Hysteresis errors in Bourdon tubes can be minimized by : using them well within the designed pressure range [other wrong options] [Discuss in forum] selecting proper material proper design and fabrication avoiding direct entry of steam into it calibrating it from time to time. |
Q36 ⇒ In case of strain gauge transducers, several strain cycles, and temperature cycles are carried out before making measurements, in order to : enable high repeatable readings [other wrong options] [Discuss in forum] increase life eliminate premature failures increase accuracy avoid drift. |
Q37 ⇒ Accuracy of standard pressure gauges, used for testing and calibration purposes is of the order of : ± 0.25% [other wrong options] [Discuss in forum] ± 1.5% ± 1% ± 0.5% ±0.1%. |
Q38 ⇒ Which gauge is based on the change of heat conductivity of a gas with pressure and the change of electrical resistance of a wire with temperature : Pirani gauge. [other wrong options] [Discuss in forum] thermocouple gauge Bourdon gauge Ionization gauge nuitating disk gauge |
Q39 ⇒ Which of the following have relatively large and negative temperature coefficients of resistance : thermistors [other wrong options] [Discuss in forum] radiation pyrometers optical pyrometers platinum resistance detectors thermocouples. |
Q40 ⇒ Thermal expansion of a solid is employed in : bimetal element [other wrong options] [Discuss in forum] thermocouple resistance thermometer bulb thermometer zener diode. |
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