Course Code and Subject: 203144: Electrical Measurements and Instrumentation
Class: SE Electrical Engineering
Unit wise questions from University Question papers 2012, 2015 and 2019 Pattern
Unit 1: A. Classification of Measuring Instruments, B. Range Extension
| 1) With suitable diagram explain range extension of ammeter, voltmeter using shunt and multiplier. Also write the expression for shunt resistance and multiplier resistance. |
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| 2) Explain the following terms related to instrument transformer : |
| (i) Transformation ratio |
| (ii) Nominal ratio |
| (iii) Burden. |
| 3) What are the different methods of damping used in analog indicating instruments? List their advantages and disadvantages. |
| 4) Draw a neat schematic diagram of attraction type moving iron instrument and explain deflecting, controlling, and damping system used in it. |
| 5) Design a multi range d.c. milli-ammeter using a basic movement with an internal resistance Rm = 50 Ω and a full scale deflection current Im = 1 mA. The ranges required are 0–10 mA; 0–50 mA; 0–100 mA; and 0–500 mA. |
| 6) Compare the following methods of damping on minimum six points : |
| (i) Air friction damping |
| (ii) Fluid friction damping |
| (iii) Eddy current damping. |
| 7) What is meant by static and dynamic characteristics of measuring instruments? Explain: Accuracy, resolution. |
| 8) Explain the following terms: |
| (i) Accuracy, (ii) Repeatability, (iii) Reproducibility. |
| 9) Which three forces are required for satisfactory operation of an analog indicating instruments? State the function of each force. |
| 10) Explain the following terms related to instrument transformer: |
| 1)Transformation ratio. |
| 2)Nominal ratio. |
| 3)Burden |
| 11) What is the need of calibration? Explain any one method of calibration with example. |
| 12) What are essential conditions for any indicating instrument? |
| 13) Explain range extension. How is the range extended in meters |
