21. Which of the following device is used as a standard for calibrating pressure gauges :
(a) manometer
(b) diaphragm
(c) bellows
(d) dead weight pressure tester
(e) piezoelectric crystal.
Ans: d
22. Which gauge can be used to measure pressure below 1 |xm :
(a) dead weight tester
(b) pirani gauge
(c) ionization gauge
(d) McLeod gauge
(e) absolute pressure sensor.
Ans: c
23. Which is not correct statement about selection of tube material for a Bourdon gauge:
(a) Have high creep strength to withstand high temperature
(b) Be stable enough to maintain its calibration indefinitely
(c) Be immune to corrosion from the fluid inside the tube, and from the atmosphere outside it
(d) Be hard enough to withstand the applied pressure without any part of it being stressed above the limit of proportionality
(e) Be easy to fabricate.
Ans: a
24. Hysteresis error in Bourdon tube can be minimized by :
(a) using proper tube material
(b) using proper diameter and thickness of tube
(c) avoiding temperature cycling
(d) using it well within the designed pressure range
(e) using separating diaphragm and avoid direct ingress of hot. fluid to tube
Ans: d
25. Pick up false statement about pressure measurements :
(a) low pressure is normally measured by manometers
(b) medium pressure by diaphragms or bellows
(c) medium and high pressure by Bourdon gauge
(d) all pressures by transducers
(e) absolute pressure by piezoelectric crystal.
Ans: e
26. Pressure gauges are never connected directly to live steam because :
(a) the tubes or bellows which operate them would be overheated, causing serious error and damage
(b) steam if leaks, can cause serious injuries to operators
(c) entry of steam would cause static head error
(d) parts of pressure gauge can't withstand temperature of steam
(e) pressure gauges are not calibrated to measure steam pressure directly.
Ans: a
27. A siphon or loop in the connecting pipe is interposed as close as possible to the pressure gauge so that:
(a) steam can condense to form a seal of water to fill the tube or bellows at the pressure being measured
(b) air or vapour collection is avoided
(c) moisture formed in pipe can be drained
(d) static head errors are eliminated
(e) it acts as dampener and does not pass on pressure variations to sensor.
Ans: a
28. When the pressure medium to be measured is air or gas, the pipe is made to rise continuously to the gauge, so that:
(a) no air or vapour can collect in pipe
(b) any moisture can be drained '
(c) moisture does not come in contact with elements of sensor/gauge
(d) moisture can condense to form seal of water
(e) static head error due to moisture is eliminated.
Ans: b
29. Ring balance gauge is used for measurement of:
(a) absolute pressure
(b) vacuum
(c) differential pressure
(d) temperature
(e) gauge pressure.
Ans: c
30. The deflection of center of capsule (formed by circumferential welding of two diaphragms) is proportional to :
(a) active diameter of diaphragm (D)
(b) D
(c) D2
(d) D3
(e) D4
Ans: e
Read More Questions:
Process Instrumentation and Control - Mechanical Engineering MCQs Part1
Process Instrumentation and Control - Mechanical Engineering MCQs Part2
(a) manometer
(b) diaphragm
(c) bellows
(d) dead weight pressure tester
(e) piezoelectric crystal.
Ans: d
22. Which gauge can be used to measure pressure below 1 |xm :
(a) dead weight tester
(b) pirani gauge
(c) ionization gauge
(d) McLeod gauge
(e) absolute pressure sensor.
Ans: c
23. Which is not correct statement about selection of tube material for a Bourdon gauge:
(a) Have high creep strength to withstand high temperature
(b) Be stable enough to maintain its calibration indefinitely
(c) Be immune to corrosion from the fluid inside the tube, and from the atmosphere outside it
(d) Be hard enough to withstand the applied pressure without any part of it being stressed above the limit of proportionality
(e) Be easy to fabricate.
Ans: a
24. Hysteresis error in Bourdon tube can be minimized by :
(a) using proper tube material
(b) using proper diameter and thickness of tube
(c) avoiding temperature cycling
(d) using it well within the designed pressure range
(e) using separating diaphragm and avoid direct ingress of hot. fluid to tube
Ans: d
25. Pick up false statement about pressure measurements :
(a) low pressure is normally measured by manometers
(b) medium pressure by diaphragms or bellows
(c) medium and high pressure by Bourdon gauge
(d) all pressures by transducers
(e) absolute pressure by piezoelectric crystal.
Ans: e
26. Pressure gauges are never connected directly to live steam because :
(a) the tubes or bellows which operate them would be overheated, causing serious error and damage
(b) steam if leaks, can cause serious injuries to operators
(c) entry of steam would cause static head error
(d) parts of pressure gauge can't withstand temperature of steam
(e) pressure gauges are not calibrated to measure steam pressure directly.
Ans: a
27. A siphon or loop in the connecting pipe is interposed as close as possible to the pressure gauge so that:
(a) steam can condense to form a seal of water to fill the tube or bellows at the pressure being measured
(b) air or vapour collection is avoided
(c) moisture formed in pipe can be drained
(d) static head errors are eliminated
(e) it acts as dampener and does not pass on pressure variations to sensor.
Ans: a
28. When the pressure medium to be measured is air or gas, the pipe is made to rise continuously to the gauge, so that:
(a) no air or vapour can collect in pipe
(b) any moisture can be drained '
(c) moisture does not come in contact with elements of sensor/gauge
(d) moisture can condense to form seal of water
(e) static head error due to moisture is eliminated.
Ans: b
29. Ring balance gauge is used for measurement of:
(a) absolute pressure
(b) vacuum
(c) differential pressure
(d) temperature
(e) gauge pressure.
Ans: c
30. The deflection of center of capsule (formed by circumferential welding of two diaphragms) is proportional to :
(a) active diameter of diaphragm (D)
(b) D
(c) D2
(d) D3
(e) D4
Ans: e
Read More Questions:
Process Instrumentation and Control - Mechanical Engineering MCQs Part1
Process Instrumentation and Control - Mechanical Engineering MCQs Part2
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