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Q#1 Electro-mechanical Instruments GATE EE 2003 MCQ +2 marks -0.66 marks

A rectifier type ac voltmeter consists of a series resistance  an ideal full wave rectifier bridge and a PMMC instrument as shown in Figure. The internal resistance of the instrument is 100 Ω and a full-scale deflection is produced by a dc current of 1mA. The value of  required to obtain full scale deflection with an AC voltage of 100 V (RMS) applied to the input terminals is

 

63.56 kΩ 

89.93 kΩ

89.97 kΩ 

141.3 kΩ

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