Twinning Engineering Programmes (TEP)

Thammasat English Programme of Engineering (TEPE)

Faculty of Engineering

ThammasatUniversity

Undergraduate Examination1stSemester of (Mid-term)

ME 321Measurement and InstrumentationSection 750002

DateTime: 12.00 – 14.00

Instructor : Asst. Prof. Channarong Asavatesanupap

Name :______ID no.______Seat no.

Instructions :

The test contains 4 problems, … pages (this page inclusive). Each of which is worth 10 marks. Before doing the test, make sure that you have got all the problems.
Do all the problems in a book provided. Remember to print your name, identification number (ID), and seat number clearly on your workbook.
Scientific calculator is not allowed to be used for the test.
Other communicating devices such as mobile phones, pagers, etc. are not permitted in the examination.
Textbooks, short notes and relevant material are not brought into the test room.

WARNING

Cheating is a serious misconduct!

Stiff penalty will be imposed to a cheater.

Before entering the examination room, make sure that you do not to bring any disallowable materials into the examination room, intentionally or unintentionally. If proctors have found them in your occupation, you will be seriously punished by suspending your study for one year and receiving a Fail(F) grade in this subject.

Name :______ID no.______Seat no.

(a) Provide the definition or descriptionof the following words

Sensitivity ………………....……….…………...…......

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Accuracy and Precision …………....…..……...... ……………......

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Resolution……………...……………………………......

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Frequency response………………………......

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Thermocouple…………......

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Name :______ID no.______Seat no.

(b) If a bulb thermometer is used to illustratea general measurement system, please

1) Label the equivalent term on each component of the thermometer.

2) Describe how each component of the thermometerworks in view of the measurement system.

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Name :______ID no.______Seat no.

2) A Wheatstone bridge utilizes a PT100 sensor in position R1 as shown in Figure. Initially, the bridge has resistances of all arms equal to 100 ohms. Assume that the PT100 experiences a change in electrical resistance with temperature according to the equation

R = R0 [1 + 0.004 (T-T0)] where Ro = 100 and To = 0 C

Determine (a) the static sensitivity of the system

(b) the temperature if the output voltage is 1 volt.

Given

Name :______ID no.______Seat no.

3)A piezoelectric pressure transducer as shown in figure is used to measure the pressure of air in a tank by generating analogue signals, and it is to be calibrated by measuring both the pressure and the electric current simultaneously for various settings. If the relationship between the pressure and the corresponding current is given by

P = 13.00 I - 51.00

where P = pressure in a tank [kPa],

I = current [mA],

Determine (a) the sensitivity of the transducer, (b) zero offset, and (c)h if I = 10 mA

4)a) Match the description from Column A with its corresponding name in Column B:

A / B

b) Decide whether the following sentences are true or false.