9. A shunt motor runs at 1200 rpm on a 420 V circuit and current taken in 30 A in addition to the field current. What resistance must be placed in series with armature in order that the speed may be reduced to 600 rpm, the current through the armature remaining same. Ra = 302 given. (5.52)

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YTE 92
9. A shunt motor runs at 1200 rpm on a 420 V circuit and current taken in 30 A in
addition to the field current. What resistance must be placed in series with
armature in order that the speed may be reduced to 600 rpm, the current through
the armature remaining same. Ra = 302 given. (5.52)
10.A 220 V DC series motor is running at a speed of 800 rpm and draws 100 A.
Calculate at what speed the motor will run when developing half the torque.
Armature + field resistance is 0.1 2. Assume that magnetic circuit is unsaturated.
(1147 rpm.)
11.230 V, DC shunt motor runs at 800 rpm and takes armature current of 50 A. Find
the resistance to be added to the field circuit to increase the speed from 800 rpm
to 1000 rpm at an armature current of 80 A. Assume the flux to be proportional
to the field current. Given ra = 0.1502 and rf = 2500.(699.)
■
Transcribed Image Text:9:55 @ ← Expert Q&A YTE 92 9. A shunt motor runs at 1200 rpm on a 420 V circuit and current taken in 30 A in addition to the field current. What resistance must be placed in series with armature in order that the speed may be reduced to 600 rpm, the current through the armature remaining same. Ra = 302 given. (5.52) 10.A 220 V DC series motor is running at a speed of 800 rpm and draws 100 A. Calculate at what speed the motor will run when developing half the torque. Armature + field resistance is 0.1 2. Assume that magnetic circuit is unsaturated. (1147 rpm.) 11.230 V, DC shunt motor runs at 800 rpm and takes armature current of 50 A. Find the resistance to be added to the field circuit to increase the speed from 800 rpm to 1000 rpm at an armature current of 80 A. Assume the flux to be proportional to the field current. Given ra = 0.1502 and rf = 2500.(699.) ■
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