Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 6th Sem New 2162005 Electro Mechanical Measurements And Instruments Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? VI (New) EXAMINATION ? WINTER 2019
Subject Code: 2162005 Date: 09/12/2019
Subject Name: Electro Mechanical Measurements & Instruments
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Explain briefly the selection criterion of transducers for industrial
applications.
03
(b) Explain different types of errors generated during measurement. 04
(c) What is a measuring instrument? Give detail classification of
measuring instruments.
07
Q.2 (a) Explain the ?Static calibration Process? giving suitable example. 03
(b) With neat sketch explain Hand Speed Mechanical Tachometer. 04
(c) Prove that sensitivity of Column Type Load Cell (Strain Gauge
load Cell) is, 2(1+?) higher than the highest sensitivity is achieved
through the single active strain gauge in quarter bridge circuit.
07
OR
(c) Explain various principle of operations of capacitive transducer
with suitable diagrams.
07
Q.3 (a) Explain the working principle of ?Stroboscope? with suitable
sketch.
03
(b) Explain with block diagram: RTD as a measurement system. 04
(c) Define the following for a measuring instrument:
(I) Indicated Value (II) Range (III) Speed of Response (IV)
Sensitivity (V) Dead Zone (VI) Tolerance (VII) Span and Range.
07
OR
Q.3 (a) List the advantages and disadvantages of PMMC type instruments. 03
(b) A 120 ? resistance strain gauge having a gauge factor of 2.0 has
been mounted on a steel bar, and it forms one arm of symmetrical
Wheatstone bridge circuit. When the steel bar is subjected to a
tensile load, the output indicator indicates an output voltage
equivalent to 5mV. Workout the mechanical strain if the gauge
specifications supplied by the manufacturer indicate an operating
current of 15mA. .
04
(c) What is ?Standardization? of a D.C. potentiometer and explain the
?Standardization Process? for the same in detail with suitable
example.
07
Q.4 (a) An analog voltmeter with scale range of 0.0-5.0 V shows a voltage
of 2.65 V. The true value of a voltage is 2.70 V. Determine the
03
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? VI (New) EXAMINATION ? WINTER 2019
Subject Code: 2162005 Date: 09/12/2019
Subject Name: Electro Mechanical Measurements & Instruments
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Explain briefly the selection criterion of transducers for industrial
applications.
03
(b) Explain different types of errors generated during measurement. 04
(c) What is a measuring instrument? Give detail classification of
measuring instruments.
07
Q.2 (a) Explain the ?Static calibration Process? giving suitable example. 03
(b) With neat sketch explain Hand Speed Mechanical Tachometer. 04
(c) Prove that sensitivity of Column Type Load Cell (Strain Gauge
load Cell) is, 2(1+?) higher than the highest sensitivity is achieved
through the single active strain gauge in quarter bridge circuit.
07
OR
(c) Explain various principle of operations of capacitive transducer
with suitable diagrams.
07
Q.3 (a) Explain the working principle of ?Stroboscope? with suitable
sketch.
03
(b) Explain with block diagram: RTD as a measurement system. 04
(c) Define the following for a measuring instrument:
(I) Indicated Value (II) Range (III) Speed of Response (IV)
Sensitivity (V) Dead Zone (VI) Tolerance (VII) Span and Range.
07
OR
Q.3 (a) List the advantages and disadvantages of PMMC type instruments. 03
(b) A 120 ? resistance strain gauge having a gauge factor of 2.0 has
been mounted on a steel bar, and it forms one arm of symmetrical
Wheatstone bridge circuit. When the steel bar is subjected to a
tensile load, the output indicator indicates an output voltage
equivalent to 5mV. Workout the mechanical strain if the gauge
specifications supplied by the manufacturer indicate an operating
current of 15mA. .
04
(c) What is ?Standardization? of a D.C. potentiometer and explain the
?Standardization Process? for the same in detail with suitable
example.
07
Q.4 (a) An analog voltmeter with scale range of 0.0-5.0 V shows a voltage
of 2.65 V. The true value of a voltage is 2.70 V. Determine the
03
2
values of absolute error and correction, also express the error as a
function of the true value and full scale deflection.
(b) With schematic diagram explain optical torsion meter. 04
(c) With schematic diagram explain Eddy Current and Rope Brake
dynamometers.
07
OR
Q.4 (a) Explain briefly the Attraction type Moving Iron instrument with
neat sketch.
03
(b) A Resistive potentiometer is rated as 200 ?, 1 W (derate at
10mW/?C above 60?C), 30 ?C/W thermal resistance. It is used with
10 V supply at 70?C ambient temperature. Calculate: (i) The power
dissipated by potentiometer (ii) Actual temperature of
potentiometer and (iii) Power dissipation allowed. Can the
potentiometer be used safely under the above conditions?
04
(c) Explain the construction and working principle of LVDT with its
advantages and disadvantages.
07
Q.5 (a) A pressure gauge reads 32.12 bar for true value of 31.58 bar.
Determine the static error and static correction.
03
(b) Explain in detail the input-output configuration of measuring
instrument.
04
(c) Explain in detail the second order system responses for step, ramp
and sinusoidal inputs.
07
OR
Q.5 (a) Explain briefly that why cold junction compensation is required in
thermocouples with suitable example.
03
(b) Derive the expression of bridge sensitivity for equal arms of
Wheatstone bridge.
04
(c) Draw the neat sketch of ?Digital Data Acquisition System? and
explain all its functional blocks.
07
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This post was last modified on 20 February 2020