Two voltmeters have the same range 0-400V. The internal impedance are 30,000 Ohms and 20,000 Ohms. If they are connected in series and 600V be applied across them, the readings are
A. 360V and 240V
B. 300V each
C. 400V and 200V
D. One of the meters out of the range and other 100V
Answer: Option A
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The spring material used in a spring control device should have the following property.
A. Should be nonmagnetic
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A. The meter is calibrated for AC and it’s error for DC would be high
B. The meter does not respond to DC signals
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voltage division formula can be applied
Voltage for the fisrt voltmeter=600 x 30000/50000=360V
Voltage for the second voltmeter=600 x 20000/50000=240V