1/2
Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
DIPLOMA ENGINEERING SEMESTER IV • EXAMINATION SUMMER- 2017
Subject Code: 340903 Date: 08- 05 -2017
Subject Name: ELECTRICAL INSTRUMENTATION
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Each question carry equal marks (14 marks)
Q.1

Define:
1). Error, 2). True value 3). Accuracy 4). Scale Sensitivity 5). Precision .Range 7). Reproducibility
07






Discuss errors in measurement.
07



Q.2

Explain Crompton potentiometer with standard cell
07





Enlist applications of Potentiometer, explain measurement of unknown current.
07



OR

Explain Wheastone Bridge.
07



Q.3

Discuss error in moving iron type ammeter and voltmeter
07





Explain ay Two with relation to electromagnetic instruments.
1).Deflecting Torque 2 Controlling torque 3). Damping torque
07




OR
Q.3

Enlist PMMC type instrument. Explain one of them.
07





What is phase sequence indicator? How it works explain.
07
2/2



Q.4

What is calibration? Explain method for calibration of Ammeter
07





Explain Block Diagram of static digital energy meter.
07



OR
Q.4

Define transducer and classification of transducer with example.
07





Explain how CT and PT are used to extend the range of ammeter and voltmeter.
07



Q.5

Write Short note: 1. Piezo electric transducer 2. Load cell.
07





Explain measurement of temperature using RTD thermister.
07

RTD

OR
Q.5

Factor to be considered in selection of transducer discuss in brief
07





Draw Block diagram and front panel controls of C.R.O.
07

C.R.O.