Subjective Assignment
BOARD LEVEL QUESTIONS ON CONVERSION OF GALVANOMETER &METER BRIDGE
Q.1
Why an ammeter and a voltmeter should be connected in series and parallel respectively in a circuit. What is the effect if the position of them are interchanged in a circuit ?
Q.2
A galvanometer gives full scale deflection at 1amp.If its resistance is 10W then how can it be converted into
(a) a voltmeter of range 0 to 20 volts
(b) an ammeter of range 0 to 10amp.
Q.3
An ammeter has a range of 10A with a shunt of 1W and a range of 15A with a shunt of 0.5W.Find the resistance of its coil and the minimum current at which it can give full scale deflection.
Q.4
A voltmeter gives full scale deflection at 10mV and its coil has a resistance 10W. Find the resistance required to be connected in series with it in order to have a full scale deflection at 1V.
Q.5
An ammeter has a range of 20A and has an internal resistance of 5W.If it gives full scale deflection at 1A then find the extra shunt required to be connected with it so as to increase its range upto 35A.
Q.6
A voltmeter reads 5V at full scale deflection and is graded according to resistance per volt at full scale deflection as 5000W/V. How will you convert it into a voltmeter that reads 20V at full scale deflection? What is the new grading in W/V ?