No. of Pages: 2

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FIRST SEMESTER M.TECH DEGREE EXAMINATION, DECEMBER 2017
Branch: Civil Engineering

Stream: Structural Engineering

01 CE 6111 Elective | - Experimental Methods and Instrumentation

Answer any two full questions from each part

Limit answers to the required points.

Max. Marks: 60 Duration: 3 hours
PARTA

1. 3. Discuss the various errors in measurement and their causes. How cantheybe 4
rectified?

b. Determine the resistance of a certain length of wire, which is given by 5
R=4p1/
Where
Length, 523.8+0.2cm

Resistivity, p 2 (5.6%«105 +0.15x 10 4Qcm
Diameter, d = 0.062 +1 .2 10-3 cm

2. a. Explain the different types of calibration. 4

b. Asecond order instrument has a time constant of 0.2 seconds. For a step input 5

and a sinusoidal input find the time at which output signal is three fourth of the

input signal.

3. ദ. Explain the frequency response character of a first order instrument 3 0. A first order
instrument is used to measure a frequency of 100 Hz with a 6 amplitude inaccuracy of

10%. What is the maximum allowable time constant? What will be the phase shift at 70
Hz?

PART B
4. 2. Derive the relation for strain sensiavity of an elecbical resistance strain gauge. 5 0. How

is temperature compensation achieved in a quarter bridge. 4

5, ഒ. Briefly describe the steps in strain gauge installation. 4