Skip to content
CampusPrep

EX-303 RGPV B.Tech

Electrical Measurements and Instruments (EMI)

Previous year papers and the official syllabus are free to read, no account needed.

Previous Year Papers

6 papers, latest Dec 2025

Free
See all 6 papers

Syllabus, notes and important questions for EX-303

Syllabus units

Topics as the official RGPV syllabus lists them.

Unit 1 Introduction, history and overview of measurement system; fundamentals of measurement system; static and dynamic characteristics of measurement systems; systematic characteristics; generalized model; transfer function; techniques for dynamic compensation; accuracy of measurement systems in steady state; measurement error; error probability function; error reduction techniques; reliability; choice and economics of measurement systems; loading effects due to shunt‑connected and series‑connected instruments; calibration curve; testing & calibration of instruments 9 topics
  • Introduction, history and overview of measurement systems
  • Fundamentals of measurement systems
  • Static and dynamic characteristics of measurement systems
  • Systematic characteristics and generalized model
  • Transfer function and techniques for dynamic compensation
  • Accuracy in steady state – measurement error and error probability function
  • Error reduction techniques, reliability, choice and economics of measurement systems
  • Loading effects caused by shunt‑connected and series‑connected instruments
  • Calibration curve and procedures for testing & calibration of instruments
Unit 1 notes
Unit 2 Galvanometers – theory, principle of operation and construction 4 topics
  • Ballistic galvanometer theory and construction
  • D’Arsonval galvanometer theory and construction
  • Definition and classification of analog and digital instruments
  • Operating principles of analog instruments, operating force, types of supports, damping and controlling mechanisms
Unit 2 notes
Unit 3 Different types of ammeters and voltmeters; digital instruments 4 topics
  • PMMC, moving iron (MI), electrodynamometer and induction ammeters & voltmeters
  • Expression for control and deflection torque, advantages, disadvantages and error sources
  • Extension of range using shunt and multiplier techniques
  • Digital voltmeter, digital ammeter, multimeter and wattmeter
Unit 3 notes
Unit 4 Instrument transformers 3 topics
  • Potential transformers (PT) and current transformers (CT)
  • Ratio and phase‑angle errors; testing procedures for instrument transformers
  • Differences between CT and PT; error reduction techniques
Unit 4 notes
Unit 5 Measurement of power 7 topics
  • Power measurement in AC and DC circuits
  • Electrodynamometer type wattmeter – construction, theory, operation and errors
  • Low power‑factor and UPF wattmeter
  • Double‑element and three‑element dynamometer wattmeter
  • Three‑phase power measurement – one‑, two‑ and three‑wattmeter methods
  • Reactive power measurement by single wattmeter method
  • Power measurement using current and potential transformers
Unit 5 notes
Unit 6 Measurement of energy 4 topics
  • Single‑phase and three‑phase digital/electronic energy meters – construction and operation
  • Energy flow and power calculations; error analysis
  • Testing by phantom loading
  • Tri‑vector meter, maximum demand meter and ampere‑hour meter
Unit 7 Power factor meter 2 topics
  • Single‑phase and three‑phase electrodynamometer type power factor meters
  • Moving‑iron type power factor meters
Unit 8 Frequency meter 4 topics
  • Vibrating reed frequency meter
  • Resonance type frequency meter
  • Weston type frequency meter
  • Synchronoscope
Unit 9 Ohmmeter 2 topics
  • Series and stunt type ohmmeters
  • Megger and ratio meter
Unit 10 Resistance measurement 6 topics
  • Classification of low, medium and high resistance
  • Voltmeter‑ammeter method
  • Wheatstone bridge method
  • Kelvin’s double bridge method
  • Loss‑of‑charge method for high resistance
  • Earth resistance measurement
Unit 11 Magnetic measurement 3 topics
  • B‑H curve determination
  • Hysteresis loop measurement
  • Power loss measurement in sheet metal using Lloyd‑Fischer square
Read the full syllabus

Exam insights

Counted from 6 past EX-303 papers.

Marks asked per paper, by unit

  • Unit 1 Fundamentals of Measurement system and Galvanometers 28 marks
  • Unit 2 Ammeters, Voltmeters and Instrument Transformers 27 marks
  • Unit 3 Measurement of Power 12 marks
  • Unit 4 Measurement of Energy and Other Parameters 24 marks
  • Unit 5 Resistance and Magnetic Measurements 20 marks

Average marks of the questions from each unit in one paper. You answer only some of them, so the total is more than the paper’s maximum.

Asked again and again

  1. Describe the experimental method for determination of B-H curve / hysteresis loop of a magnetic specimen, e.g. method of reversals, six-point / step-by-step method for bar form.

    Asked 4 times: 2025, 2024, 2023, 2018

  2. Explain the static and dynamic characteristics of measuring instruments / measurement systems

    Asked 4 times: 2025, 2024, 2020, 2019

  3. Describe the Lloyd-Fisher square method for measurement of iron / power loss in ferromagnetic (transformer steel strip) material using the wattmeter method.

    Asked 4 times: 2023, 2020, 2019

Other 3rd semester EX subjects