Q1) A 4 poles de separate excited generator has 56 slots, and each armature coil has 8 turns. The wire used to wound the armature has a resistivity = 6.2 x 10-8 22.m, and the average length of each turn = 1.8 m, the wire cross-section area = 5 mm². If the flux per pole = 0.012 web, find the load voltage when the generator is wave wound, driven at 110 rad/sec, and supplies 7 A.

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Q1) A 4 poles de separate excited generator has 56 slots, and each armature coil has 8 turns. The
wire used to wound the armature has a resistivity = 6.2 x 10-8 2.m, and the average length of
each turn = 1.8 m, the wire cross-section area = 5 mm². If the flux per pole = 0.012 web, find
the load voltage when the generator is wave wound, driven at 110 rad/sec, and supplies 7 A.
3+10/
50+8/
Q2) A series de motor has flux characteristics given by p= web, when I represent the field's
current. If the supply voltage = 100 V, the armature resistance = 0.7 £2, and the field resistance
= 0.32. The motor takes 25 A when driving a load at 1450 R.P.M. Find load torque, starting
torque, and no-load speed. Draw the required circuit diagram.
Q3) Two de generators, A and B, connected in parallel with the following characteristics:
GA: P=3 Kw; Vr = 200 V, ra = 192.
GB: E=210 V; I, = 20 A, ra = 0.8 2.
Find the maximum possible load power, the power supplied to the load at floating conditions.
Q4) Answer any four questions
A: Draw the circuit diagram for the shunt generator and give the condition for its voltage build-
up?
B: If the no-load voltage of the series generator is 12 V. and the load voltage of it at a certain
load is 180 V. What will be the voltage regulation?
C: The separate excited motor with no-load speed = 150 rad/sec has a speed = 115 rad/sec at a
torque = 22 N.M. At what torque will its speed be 1350 R.P.M?
D: Why the load voltage at the same conditions for shunt connected generator is less than when
separate excited?
E: The parallel operation of two dc, A and B, generators when EA> EB will cause a circulating
current. What is the direction of this current, and which machine will act as a generator?
Transcribed Image Text:Q1) A 4 poles de separate excited generator has 56 slots, and each armature coil has 8 turns. The wire used to wound the armature has a resistivity = 6.2 x 10-8 2.m, and the average length of each turn = 1.8 m, the wire cross-section area = 5 mm². If the flux per pole = 0.012 web, find the load voltage when the generator is wave wound, driven at 110 rad/sec, and supplies 7 A. 3+10/ 50+8/ Q2) A series de motor has flux characteristics given by p= web, when I represent the field's current. If the supply voltage = 100 V, the armature resistance = 0.7 £2, and the field resistance = 0.32. The motor takes 25 A when driving a load at 1450 R.P.M. Find load torque, starting torque, and no-load speed. Draw the required circuit diagram. Q3) Two de generators, A and B, connected in parallel with the following characteristics: GA: P=3 Kw; Vr = 200 V, ra = 192. GB: E=210 V; I, = 20 A, ra = 0.8 2. Find the maximum possible load power, the power supplied to the load at floating conditions. Q4) Answer any four questions A: Draw the circuit diagram for the shunt generator and give the condition for its voltage build- up? B: If the no-load voltage of the series generator is 12 V. and the load voltage of it at a certain load is 180 V. What will be the voltage regulation? C: The separate excited motor with no-load speed = 150 rad/sec has a speed = 115 rad/sec at a torque = 22 N.M. At what torque will its speed be 1350 R.P.M? D: Why the load voltage at the same conditions for shunt connected generator is less than when separate excited? E: The parallel operation of two dc, A and B, generators when EA> EB will cause a circulating current. What is the direction of this current, and which machine will act as a generator?
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