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Standard X
Physics
Heating Effect of Current
A 600 V DC mo...
Question
A 600 V DC motor drives a 60 kW at 900 rpm. The shunt field resistance is 100
Ω
and the armature resistance is 0.16
Ω
. If the efficiency is 85% then the speed regulation of motor is _________%.
3.1
Open in App
Solution
The correct option is
A
3.1
P
i
n
=
60
0.85
=
70.59
k
W
I
L
=
70.59
×
10000
600
=
117.65
A
,
I
f
=
600
100
=
6
A
I
a
=
117.65
−
6
=
111.65
A
E
a
=
600
−
(
111.65
×
0.16
)
=
582.14
V
No load:
E
a
≈
V
=
600
N
0
=
900
×
600
582.14
=
927.6
r
p
m
Speed regulation
=
927.6
−
900
900
×
100
%
=
3.1
%
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