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GATE 2020 || Measurements || Quiz 2
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Question 1
The input impedance of the permanent magnet moving coil (PMMC) voltmeter is infinite. Assuming that the diode shown in the figure below is ideal, the reading of the voltmeter in Volts is 
Question 2
A periodic voltage wave form observed on an oscilloscope across a load is shown. A permanent magnet moving coil (PMMC) meter connected across the same load reads:
Question 3
A voltmeter having a sensitivity of 1 kΩ/V is connected across an unknown resistance in series with a milliammeter reading 80 V on 150 V scale. When the milliammeter draws 10 mA current, find the error due to the loading effect of the voltmeter (Neglect the resistance of the milliammeter)
Question 4
An electro dynamometer wattmeter measures power in 1 - ∅ circuit. Load voltage 230 V and current 5 A at lagging pf of 0.1, wattmeter potential coil circuit resistance is 10 kΩ and inductance is 100 mH then ___________% error will be the error.
Question 5
The coils of a wattmeter have resistances 0.01 Ω and 1000 Ω; their inductances may be neglected. The wattmeter is connected as shown in the figure, to measure the power consumed by a load, which draws 25 A at power factor 0.8. The voltage across the load terminals is 30 V. The percentage error on the wattmeter reading is _________.
Question 6
A galvanometer with a full-scale current of 10 mA has a resistance of 1000Ω. The multiplying power (the ratio of measured current to galvanometer current) of a 100Ω shunt with this galvanometer is
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Nov 17ESE & GATE EE
