Instrumentation 1 Important Questions
Here are some of the Instrumentation 1 Important Questions. Practice well before the examination!
Chapter 1:
- Define measurement and measurement system. Explain the measurement system with the help of block diagrams. [8]
- Differentiate between analog and digital measurement systems. [4]
- Discuss different types of errors in measurement systems and methods to minimize them. [8]
Chapter 2:
- Differentiate between static and dynamic performance parameters. Also, explain different types of static and dynamic performance parameters. [8]
- Which bridge is used for the measurement of inductance of a coil having a high-quality factor? Explain how the measurement is done and why the bridge is preferred. [8]
- Obtain the balance equation for an AC bridge and explain with a diagram how the Schering bridge can be used to measure unknown capacitance. [8]
- Obtain the balance equation for the Maxwell bridge and explain why it is suitable for the measurement of inductance of a coil having a quality factor between 1 to 10. [8]
Chapter 3:
- What is an LVDT? Point out its merits and demerits. [4+2]
- Explain the loading effect on a potentiometer and explain the effect of load resistance on the linearity of the potentiometer. Also, show that the error occurs at the midpoint of the potentiometer. [8]
- What is a piezoelectric transducer? Define voltage sensitivity and charge sensitivity. Give the equivalent circuit of a piezoelectric transducer. Derive the expression for the output voltage by making suitable assumptions. [8]
- Explain how the non-linear characteristics of a capacitive transducer, used for the measurement of displacement using the principle of change in capacitance due to the change in distance between plates, can be made linear. [8]
- Show how the capacitive transducer can be used for the measurement of liquid level. [6]
- Define the gauge factor of a resistance strain gauge and obtain the expression for the same. [8]
Chapter 4:
- Explain with a circuit diagram how an op-amp acts as: a. Inverter b. Non-inverter c. Subtractor d. Integrator e. Differentiator [8]
- What is an Instrumentation amplifier? Derive the expression for its gain. [6]
Chapter 5:
- Explain how A/D conversion can be achieved by using the dual-slope method and flash method. [8]
- Explain the method of D/A conversion using an R-2R ladder network. Why do we prefer to use this DAC over the weighted resistor network (WRN) type? [8]
Chapter 6:
- What is sampling and the sampling theorem? State and explain the Nyquist criterion. Also, explain the phenomenon of aliasing and the way to eliminate it. [8]
- Explain a digital data acquisition system with the help of block diagrams. [8]
- List out the different types of frequency meters. Explain the constructional detail and working principle of any one of them to measure frequency. [8]
- Explain the sample and hold circuit with necessary circuit diagrams. [8]
Chapter 7:
- Describe the constructional details and working of a single-phase electrodynamometer type of wattmeter. Also, derive the expression for deflection for AC operation. [8]