EE3403 Measurements and Instrumentation Important Questions

EE3403 Measurements and Instrumentation

Important Questions

Unit 1

1. List out the functional elements of a generalized Instrumentation System. Draw the functional block diagram of an Instrumentation system and explain their functions.
2. Define and explain the following terms.
   (i) Speed of response
   (ii) Measuring lag
   (iii) Fidelity and dynamic error
3. With aid of block diagram showing the basic functional elements of an General instrument and explain the functions of each block with example.
4. Describe in detail the different types of dynamic errors in a measurement system.
5. Draw the block diagram of a measurement system and explain about each functional element in it.
6. Explain in detail about instrumental errors, their classification and remedial step taken in the case of occurrence of such errors.

Unit 2

1. Describe the working principle of repulsion type moving iron instruments. Derive the expression for deflection if spring control is used.
2. Describe the constructional details and operation of a single phase induction type energy meter.
3. Explain the principle construction and working of single phase induction type energy meter also list its merits and demerits.
4. Explain with neat diagram about the principle construction and working of repulsive type moving iron instrument and also discuss its merits and demerits.
5. With neat diagrams, explain the working of dynamometer wattmeter and write the expression for average deflecting torque while measuring ac power.
6. Explain the construction and principle of working of induction type wattmeter.

Unit 3

1.  Construct the Wien Bridge and explain its operation with bridge balance equations.
2. Draw the circuit for Instrumentation Amplifier and explain its operation with voltage expression.
3. Explain the operation of wheatstone bridge with neat circuit diagram and also derive the expression for determining unknown resistance.
4. Explain how inductance is measured in terms of known capacitance using Maxwell’s bridge and also derive the equation for balance condition.
5. Derive the expression for unknown inductance using Maxwell’s bridge.
6. State the conditions for an ac bridge to be balanced. Draw the circuit diagram of a schering’s bridge and derive the expressions for the unknown quantities.

Unit 4 

1. Explain how are the magnitude and direction of the displacement detected in linear voltage differential transformer (LVDT).
2. What is called Smart Sensor? Mention its salient features. Explain its operation with its functional block diagram.
3. With a suitable transducer explain the measurement of
   (i) Pressure
   (ii) Temperature
4.  Explain the basic building blocks of smart sensor and compare it with conventional sensors.
5. Explain why the ac tachometer deviates from linearity characteristics at high speeds.
6. With a circuit explain the working of a thermistor and explain why it is not suited at high temperatures.

Unit 5

1. Explain the principle, how frequency of AC signals can be measured using the digital instrument.
2. Draw the functional block diagram of Digital Storage Oscilloscope and describe its operation.
3. With neat diagram explain the working of successive approximation type ADC with suitable example.
4. Explain the working of weighted resistor type DAC with neat circuit diagram.
5. Draw the block diagram of a DSO and explain the working. Compare between ASO and DSO performance.
6. Explain four important features of virtual instrumentation.