1. A rotor-resistance starter for a three-phase wound-rotor induction motor (a) adds external resistance to the wound rotor via sliprings (b) is connected in series with the machine stator….
Calculate the resistance of a shunt required to convert it for use as a 0–10 A ammeter.
1.The instrument of Exercise 7 is to have a multiplier connected in series with it
to convert it for use as a voltmeter to read up to 50 V. What will be the multiplier resistance? 2. A permanent-magnet moving-coil instrument has a resistance of 3 _, but has a 27 _ swamping resistor connected in series with it. The movement requires a current of 15 mA for full-scale deflection. Calculate the resistance of a shunt required to convert it for use as a 0–10 A ammeter. What will be the resistance of a multiplier to convert the unit for use as a 0–300 V voltmeter if the swamping resistor remains in circuit?