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Q1— Section header —
1.1Indicate whether the statements are TRUE or FALSE by writing 'True' or 'False' next to the question number (1.1.1
1.1.5\ in the ANSWER BOOK.
1.1.1The work principle of a strain gauge is that the electrical resistance of a conductor changes when a tension or a pressure is applied to it.
1.1.2Bonded types are physically cemented to the structure of the strain that needs to be monitored.
1.1.3An instrumentation system consists mainly of three sections which are used together for measuring and controlling.
1.1.4process is physical substance that needs to be controlled.
1.1.5A grid type strain gauge consists of a thin wire shaped in a grid pattern bonded to a carrier sheet. (5 1\ (5\
1.2List FIVE characteristics that influence the choice of wire f or the manufacturing of a strain gauge is. (5\
1.3If force or pressure is applied to certain crystals, such as quartz, Rochelle salt and barium titanate, the crystal generates an EMF proportional to the pressure or force applied to it.
1.3.1Name the transducer describe above (1\
1.3.2List FIVE advantages of th is transducer
1.3.3Name THREE disadvantages of this transducer. (3\
1.3Make a neat labelled sketch of this transducer. (6\ [25]25
Q2— Section header —
2.1A t hermopile is a temperature sensitive device
2.1.1Explain the construction and working principle of thermopiles (3\
2.1.2Make a neat labelled sketch of a thermopile. (5\
2.2Draw basic characteristic graph of each of the thermistors:
2.2.1PTC thermistor
2.2.2NTC thermistor (2 3\ (6\
2.3.1Name THREE advantages of using a pyrometer.
2.3.2Name THREE disadvantages of using a pyrometer. (2 3\ (6\
2.4Choose an item from COLUMN B that matches a description in COLUMN A. Write the letter (A I\ next to the question number (
2.4.1
2.4.5\ in the ANSWER BOOK. COLUMN A COLUMN B
2.4.5Hypothetical object capable of absorbing all the electromagnetic radiation falling on it When a current flows along a copper wire with a temperature that
Q3— Section header —
3.1Complete the paragraph by writing the missing words next to the question number (
3.1.4\ in the ANSWER BOOK. Pneumatic telemetering is used when a also known as the (3.1.3 changes movement from a measured variable into a (4
3.2Name FIVE types of electrical telemetering. (5\
3.3Nam FOUR disadvantages of a pneumatic system. (4\
3.4Make a neat, labelled sketch of an on off pneumatic telemetering system that is used to vary the pressure of the output signal
Q3— Section header —
Q4— Section header —
4.1Make a neat, freehand labelled sketch of a control valve. (9\
4.2Define the terms:
4.2.1oad change
4.2.2Measured variable
4.2.3Control point
4.2.4Automatic control
4.2.5Offset (5 1\ (5\
4.3In any form of process there are always a number of lags present. The type of lag depends on the type of process.
4.3.1Explain the term lag as used in instrumentation. (2\
4.3.2Name and explain THREE types of lags. (9\ [25] TOTAL 10025