Kerala University 2001 B.Tech Mechanical Engineering electronic insruments and measurements - Question Paper
Keg. No......................................................................(2 pages) L 20ol
Name..................................
tfTFTH SEMESTER B.TECH. (PART-TIME) DEGREE EXAMINATION
NOVEMBER 2001
ELECTRONIC INSTRUMENTS AND MEASUREMENTS (T)
(1993 Schemc)
Time Throe Houra Maximum : 100 Marks
Answer any two questions from each ftwdide.
Module I
2. (a) Explain the terms static sensitivity and "Linearity as referred to instminenfca. (6 marks)
(b) A lDrOOO ohm variable resistance has a linearity of 0.1 percent and the movement of uunUut arm i 820.
' (i) Determine the maximum position deviation in degrees) and resistance deviation m ohm.
(ii) If tbe instrument is to be used as a potentiometer with a linear scale of 0 lo 1.6 V, determine the voltage error.
' ' (10 marks)
& in) gl>--1- r.p t \rrvp with a iwat akatah how LVUT is used-
for measurement of linear displacements.
(10 marks)
(b) A Thermistor has a resistance of SflflO ohms at 0 C and 794 ohms at 50* C. Calculate the range of resistance to be measured in case temperature varied from 40* C to 100 C.
(fi mirks)
U. (a) Draw the circuit diagram of an instrumentation amplifier and derive an expression For its voltage gain.
(8 marks)
(b) A strain ffauge used has h resistance of 120 ohm and a gauge factor of 2, The strain gauge bridge is calibrated by connecting a standard, resistor shunted across one of the arms. Calculate the value of the ahunt resistance needed to obtain equivalent micro strain love I of 300.
<8 marks)
Module H
A. (a) How does a DVM compare with a VTVM. llraw the block schematic of a DVM find explain ii operation. Explain the difference between a 4-digit and a 356 digit I JVM.
* (9 mark*)
(b) What is the possible error in volts> when a 3W digit DVM is reading 5 V on 10 V range and when reading 0.3 V on 10 V raj>ge V Assume that the DVM has an accuracy specification of * 0.5 % of readiog 1 digit.
(8 marks)
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