JNTU
JNTU B.Tech II TRANSDUCERS ENGINEERING Previous Question Paper (April/May - 2018 - R16)
Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks and may have a, b, c as sub questions.
PART A
Define accuracy, resolution and sensitivity.
Answer
Accuracy is the closeness with which an instrument reading approaches the true value of the variable being measured. Resolution is the smallest change in the input variable that produces a detectable change in the instrument output. Sensitivity is the ratio of the change in output of the instrument to the corresponding change in the input variable.
Write the international standards of voltage, current and frequency.
Answer
The international standards are maintained by the BIPM: 1. Voltage: Defined by the Josephson effect, using the Josephson constant KJ = 483597.9 GHz/V. 2. Current: Defined by the Quantum Hall effect, relating current to the fundamental charge and Planck's constant. 3. Frequency: Defined by the transition between two hyperfine levels of the ground state of the Cesium-133 atom, where 1 Hz is one cycle per second.
Define the order of an instrument and give examples for 0th, 1st and 2nd order instruments.
Answer
Sign in to view the complete answer paper.
Define Transfer function of a measurement system and write Transfer Function of 2nd order system.
Answer
Sign in to view the complete answer paper.
What is the working principle of semiconductor temperature sensors?
Answer
Sign in to view the complete answer paper.
What is the working of well type and ring type manometers.
Answer
Sign in to view the complete answer paper.
What is the working of pivoted vane type flow sensor?
Answer
Sign in to view the complete answer paper.
Describe the working of an ionization type vacuum sensor.
Answer
Sign in to view the complete answer paper.
List different types of head flow sensors and their advantages.
Answer
Sign in to view the complete answer paper.
Explain the working principle of transit time ultrasonic flow meter.
Answer
Sign in to view the complete answer paper.
PART B
Draw the functional block diagram of a measuring system and explain the functions of each element with typical examples.
Answer
Sign in to view the complete answer paper.
Discuss various errors observed in measuring systems and suggest the methods for Eliminating/minimizing them.
Answer
Sign in to view the complete answer paper.
Explain the general input-output configuration and static characteristics of measurement systems.
Answer
Sign in to view the complete answer paper.
Discuss international, primary, secondary and working standards and their applications with examples.
Answer
Sign in to view the complete answer paper.
Explain the static and dynamic characteristics of measurement systems with examples.
Answer
Sign in to view the complete answer paper.
Discuss the response of a second order system for step, ramp and sinusoidal inputs and derive expressions for rising time, settling time and natural frequency.
Answer
Sign in to view the complete answer paper.
Derive the transfer function of a first order system with dead time and discuss the response of first order system for step and ramp inputs and deduce expressions for time constant and dynamic error.
Answer
Sign in to view the complete answer paper.
Discuss the time response and frequency response of a second order system by taking typical example.
Answer
Sign in to view the complete answer paper.
Explain the principle and working of a three lead wire resistance thermometer with the help of measuring circuits.
Answer
Sign in to view the complete answer paper.
Explain the theory of radiation pyrometers and describe the working of total radiation pyrometer with the help of neat diagram.
Answer
Sign in to view the complete answer paper.
Describe the methods of measurement of differential pressure using bellows and manometers.
Answer
Sign in to view the complete answer paper.
Explain the principle and working resonant wire type of transducers for pressure measurement.
Answer
Sign in to view the complete answer paper.
Explain the methods of measurement of flow using static tube and yaw tube.
Answer
Sign in to view the complete answer paper.
Describe the working of hot wire anemometer for measurement of flow rate.
Answer
Sign in to view the complete answer paper.
Describe the following methods used for measurement of vacuum with neat sketches using: (a) Thermocouple gauges (b) McLeod gauges (c) Knudsen’s gauge.
Answer
Sign in to view the complete answer paper.
What are area head flow meters? Explain the working an orifice flow meter and derive an expression for flow of fluids through it.
Answer
Sign in to view the complete answer paper.
Explain the theory and working of ultrasonic flow meters and discuss their advantages.
Answer
Sign in to view the complete answer paper.
Explain the working of positive displacement type flow meter with help of neat sketch.
Answer
Sign in to view the complete answer paper.
Describe the working of a Vortex shedding type flow meter and mention its advantages and limitations.
Answer
Sign in to view the complete answer paper.