Electrical Measurements & Instrumentation (EMI) important questionsMost repeated in SPPU papers
These 22 questions appeared in more than one SPPU Electrical Measurements & Instrumentation paper we have: 8 papers, from May 2023 to Nov 2025. The most-asked come first. Each one links to the papers it was asked in.
Repeated questions
Endsem questions (22)
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A 230 V, single phase, energy meter has constant load of 5 A passing through it for 6 hours at unity power factor. If the meter disc makes 2760 revolutions during this period, what is meter constant in revolutions per kWh. Also calculate power factor of the load if the number of revolutions made by the meter are 1800 when operating at 230 V and 6 A for 4 hours
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When the power of 3 phase balanced star connected load is measured by single wattmeter with current coil in Y phase and pressure coil between Y phase and neutral, it shows 6 kW. The load current is 30 A at 400 V. What will be the reading of wattmeter if connections of current coil remain unchanged and pressure coil is connected between R and B phases.
- 2×asked
A single phase energy meter is supplying power to a unity p.f 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 p.f. of the load if the load is operated for 4 hours at 240 V, 5 A and meter making 1500 revolutions.
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Questions count as repeated when their wording matches closely across papers. Numericals that depend on a figure are left out, since the figure changes from paper to paper.