1. A shunt generator has an armature circuit resistance of 0.4 Q, a field-circuit resistance of 60 Q, and a terminal voltage of 120 V, when it is supplying a load current of 3A as shown in Figure 1 below, find: 1, = 30 A 0.4 0 60 V, = 120 V Load Figure 1 (a) The field current. (b) The armature current. (c) The copper losses at the above load. (d) If the rotational losses are 350 W, what is the efficiency at above load. 2. A shunt motor draws 6 kW form a 240 V line. If the field resistance is 100 Q, find line current (IL), field current (If) and armature current (la)
1. A shunt generator has an armature circuit resistance of 0.4 Q, a field-circuit resistance of 60 Q, and a terminal voltage of 120 V, when it is supplying a load current of 3A as shown in Figure 1 below, find: 1, = 30 A 0.4 0 60 V, = 120 V Load Figure 1 (a) The field current. (b) The armature current. (c) The copper losses at the above load. (d) If the rotational losses are 350 W, what is the efficiency at above load. 2. A shunt motor draws 6 kW form a 240 V line. If the field resistance is 100 Q, find line current (IL), field current (If) and armature current (la)
Introductory Circuit Analysis (13th Edition)
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ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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IL = 3A
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Transcribed Image Text:1. A shunt generator has an armature circuit resistance of 0.4 2, a field-circuit
resistance of 60 Q, and a terminal voltage of 120 V, when it is supplying a load
current of 3A as shown in Figure 1 below, find:
= 30 A
0.4 N
60 0
V,
= 120 V
Load
Figure 1
(a) The field current.
(b) The armature current.
(c) The copper losses at the above load.
(d) If the rotational losses are 350 W, what is the efficiency at above load.
2. A shunt motor draws 6 kW form a 240 V line. If the field resistance is 100 Q, find line
current (IL), field current (If) and armature current (la)
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