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BARC-2018 EE: Electrical & Electronics Measurement Quiz 3

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Question 1

When a load of 750 W is connected, the disc of a single-phase energy meter rotates at 16 revolutions per minute. If the load is on for 6 hours, determine the % error of the meter. The meter constant is 1200 revolutions/kWh in percentage?

Question 2

A strain gauge forms one arm of the bridge shown in the figure below and has a nominal resistance without any load as Rs = 300Ω. Other bridge resistances are R1 = R2 = R3 = 300Ω. The maximum permissible current through the strain gauge is 20 mA. During certain measurement when the bridge is excited by maximum permissible voltage and the strain gauge resistance is increased by 1% over the nominal value, the output voltage V0 in mV is

Question 3

The coil of a PMMC instrument has 60 turns, on a former that is 18 mm wide, the effective length of the conductor being 25 mm. It moves in a uniform field of flux density 0.5 Tesla. The control spring constant is 1.5 × 10-6 Nm/degree. Calculate the current required to produce a deflection of 100 degree?

Question 4

Determine the number of turns required to produce an angular deflection of 60° when a current of 4 mA flowing through the coil if a PMMC instrument have a coil of dimension 12 mm x 10 mm and the flux density in an air gap is 1.2 x 10-3 Tesla and the spring constant is 0.10 x10-6 N-m/rad.

Question 5

The coil of PMMC meter has 60 turns on a force i.e., 18 mm wide, the effective length of the conductor being 25mm. It moves in a uniform field flux density of 0.5 tesla. The control spring constant i 1.5x10-6 N-m/degree. Calculate the current required to produce a deflection of 100°C

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Jan 8ESE & GATE EE