Electronic Instruments and Measurements - Dec 2013

Electronics & Telecomm. (Semester 3)

TOTAL MARKS: 80
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Assume data if required.
(4) Figures to the right indicate full marks. 1 (a) Draw a block diagram for generalized measurement system and explain its components.(5 marks) 1 (b) A strain gauge with gauge factor of 2 is fastened to a metallic member subjected to a stress of 1000kg/cm². The modulus of elasticity of the metal is 2×10⁶ kg/cm². Calculate the percentage change in the resistance of the strain gauge? What is the value of Poisons ratio?(5 marks) 1 (c) Explain the significance of X-1/2 digitd display(5 marks) 1 (d) Describe the various types of sweeps used in CRO(5 marks) 2 (a) Compare and explain different types of ADCs(10 marks) 2 (b) Draw and Explain the block diagram of general purpose CRO(10 marks) 3 (a) Describe how Q-meter is used for the measurement of low impedance. What are the various sources of error in Q-meter?(10 marks) 3 (b) Explain with neat diagram the working principle of LVDT. Give its applications.(10 marks) 4 (a) what is basic principle of wave analyzer? Explain heterodyne type wave analyzer with application.(10 marks) 4 (b) Explain the principle of operation of dual slope DVM.(10 marks) 5 (a) Draw and explain the block diagram of DSO.Describe various modes of operation in it.(10 marks) 5 (b) Derive an expression for inductance measurement using Hay bridge(5 marks) 5 (c) Brief out classification of errors in measurement(5 marks) 6 (a) Brief out classification of transducers(7 marks) 6 (b) Explain electrodynamometer type wattmeter(7 marks) 6 (c) Derive an expression for resistance measurement using Wheatstone bridge.(6 marks)