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EndsemNov 20232019 patternSE Electrical

Electrical Measurements & Instrumentation (EMI) SPPU Endsem Question Paper Nov 2023

All 6 questions from this SPPU endsem paper, as printed. Read them here or open the PDF.

Open the PDFMost repeated EMI questions
Subject code
203144
Pattern
2019 pattern
Exam
Endsem
Session
Nov 2023
Max. marks
70
Time
2½ Hours
Semester
III
Paper code
[6179]-219

Instructions to the candidates

  1. Solve Q.1 or Q.2, Q.3 or Q.4, Q.5 or Q.6 Q.7 or Q.8
  2. Figures to the right indicate full marks.
  3. Neat diagrams must be drawn wherever necessary.
  4. Assume suitable additional data, if necessary.
  5. Use of non-programmable calculator is allowed.

Questions

  1. Q1

    1. a)

      What are the different methods to measure power in three phase circuits? Explain any one method in detail.

      [6]
    2. b)

      State and explain errors in dynamometer type wattmeter.

      [6]
    3. c)

      A wattmeter reads 4.5 kW when its current coil is connected in the ‘R’ phase and its voltage coil is connected between ‘R’ phase and neutral of a symmetrical 3 phase system supplying a balance load of 20 A at 415V. What will be the reading of the wattmeter if the current coil remains unchanged and voltage coil is connected between ‘B’ and ‘Y’ phases? The phase sequence is RYB.

      [6]

  2. Q2

    1. a)

      With neat diagram, explain construction and working of a dynamometer type wattmeter.

      [6]
    2. b)

      When two wattmeter method is used for measurement of power in a three phase balanced circuit, comment upon the readings of the two wattmeter under following conditions. i) when the power factor is unity ii) when the power factor is zero

      Also asked:May 2023

      [6]
    3. c)

      Two wattmeter’s connected to measure the power supplied to a 3 phase, 500 V circuit indicate the total input to be 10 kW. The power factor is 0.3 lagging. Find the reading on each wattmeter. 2

      [6]

  3. Q3

    1. a)

      Draw neat diagram of induction type energy meter, label all the parts and explain its construction and working.

      Also asked:Nov 2025 ·Nov 2024 ·May 2024 ·May 2023

      [9]
    2. b)

      A single phase energy meter is supplying power to a resistive load at 240 V, 4.4 A for a period of 5 hours. i) If disc makes 2400 revolutions, calculate the meter constant. ii) Calculate the power factor of the load if the load is operated for 4 hours at 240 V, 5A and meter making 1500 revolutions.

      Also asked:May 2024

      [8]

  4. Q4

    1. a)

      Explain with neat diagram and necessary phasor diagrams, how single- phase energy meter can be calibrated at different power factors.

      Also asked:May 2024

      [6]
    2. b)

      With a block diagram explain working of single phase static energy meter.

      Also asked:Nov 2025 ·May 2025 ·Nov 2024 ·May 2023

      [6]
    3. c)

      An energy meter is designed to make 100 revolutions of disc for one unit of energy. Calculate the number of revolutions made by it when connected to load carrying 40A at 230V and 0.4 power factor for an hour. If it actually makes 360 revolutions, find the percentage error and also state that whether meter is fast or slow.

      [5]

  5. Q5

    1. a)

      Give detailed classification of transducers along with examples of each type. [ 6 ]

      Also asked:May 2024

    2. b)

      With neat diagram, explain Pirani gauge for measurement of low pressure.

      Also asked:Nov 2024 ·May 2024

      [6]
    3. c)

      Draw a block diagram of DSO. Explain functions of each block.

      [6]

  6. Q6

    1. a)

      Define pressure? What is the classification of pressure? State the various methods of measurement for each type.

      [6]
    2. b)

      With a suitable diagram explain working of inductive transducres.

      [6]