Mechanical Engineering : Process Instrumentation And Control QUESTIONS AND ANSWERS :: part2 : 16 to 20
Following Mechanical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :
16.Twisting the thermocouple wires together and heat welding them : |
| is the standard practice of making junction |
| would result in noise generation |
| cause small errors due to local e.m.f. which may arise if the junction is too long |
| would slow down the response |
| result in inaccuracies. |
17.Proving rings are used to measure : |
| displacement |
| force |
| velocity |
| acceleration |
| shock. |
18.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 |
| 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. |
19.Which of the following thermocouple generates highest e.m.f. for a given temperature : |
| copper-constantan |
| iron-constantan |
| chromel-alumel |
| platinum-rhodium platinum |
| silver-palladium. |
20.For measuring temperature in the range of 20 to 600�C, following liquid is used in glass thermometer : |
| mercury |
| alcohol |
| toluene |
| pentane |
| creosote. |
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