Electronic Instrumentation (EX-604 (A)) - Important Questions

Explain the principle, construction and working of dual-beam CRO and dual-trace CRO with neat sketch and compare/contrast them.

Draw the block diagram of a general purpose CRO and explain the function/working of each block. Write any four applications of CRO.

Write short note on multi-input sampling oscilloscope. List its applications and precautions to be taken while using it.

Explain the circuit and working of the Wien bridge for measurement/determination of frequency.

What is loss factor/dissipation factor of a capacitor? How is it related to Q-factor? Describe the Schering bridge including high-voltage features for its measurement.

A Maxwell bridge is used to measure an inductive impedance. At balance C1 = 0.01 microF, R1 = 470 kOhm, R2 = 5.1 kOhm and R3 = 100 kOhm. Find the series equivalent inductance and resistance of the unknown impedance.

Explain the working principle of a resistance strain gauge (resistance change due to strain) and derive/define the expression for gauge factor.

Explain the construction and working of LVDT with neat diagram. Draw its input-output characteristics and mention advantages and limitations.

What is a transducer? Explain primary and secondary transducers with examples, including input characteristics and classification.

Write short notes on thermocouple and Hall effect transducers.

What is a function/signal generator? Explain its working principle/operation with block diagram, including the method of producing sine wave.

Explain the circuits and working of frequency-selective (audio frequency) and heterodyne wave analysers. Differentiate them in terms of sensitivity and selectivity.

Explain the block diagram, working principle and function of each block of a digital frequency meter.

Explain the operation of a dual-slope integrating type digital voltmeter and compare it with successive-approximation type in terms of accuracy and speed.

A resistance strain gauge with gauge factor 2 is cemented to a steel member subjected to a strain of 1 x 10^-6. If original resistance is 130 ohm, calculate the percentage change in resistance.

Explain the role of RS232C and IEEE-488 (GPIB) interfaces in computer-controlled instrumentation systems and compare them with modern USB and Ethernet-based control.