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BARC ECE 2019 :Measurements Nuclear Quiz 1

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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^-3Tesla 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

Question 6

A dc voltmeter with sensitivity 1 kΩ/V and internal resistance 200 Ω is connected with a silicon diode and a series multiplier of 50 kΩ, as shown below.

If an ac voltage of 25 V r.m.s is applied at the input, how much voltage is displayed by the dc voltmeter?

Question 7

If an ac voltmeter using full wave rectifier displays an output of 57.6 V, what is the ac input applied to the voltmeter?

Question 8

The circuit shown below is a series type ohmmeter for measuring an unknown resistance .

What is the purpose served by the shunt resistor R₂?

Question 9

A lissajous pattern on oscilloscope is stationary and has 6 horizontal tangencies and 4 vertical tangencies. The frequency of horizontal input is 1200 Hz. determine the frequency of vertical input.

Question 10

An electrically deflected Cathode Ray Tube has a final anode voltage of 2000 V and parallel deflecting plates 1.5 cm long and 5 mm apart. If the screen is 50 cm from the centre of deflecting plates, find velocity of beam (in m/sec).

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ESE & GATE EC Electrical & Electronics Measurements

Jun 24ESE & GATE EC