1
You visited us
1
times! Enjoying our articles?
Unlock Full Access!
Byju's Answer
Standard XII
Physics
Inductors in Circuits
The current d...
Question
The current drawn by a
220
V
DC series motor of armature resistance
0.50
and back emf
200
V
is
A
40
A
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
B
400
A
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
450
A
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
500
A
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution
The correct option is
A
40
A
E
b
=
V
t
−
I
a
R
a
where
V
t
= terminal voltage
E
b
= back emf.
I
a
= armature current or line current.
R
a
= Armature resistance.
⟹
I
a
=
V
t
−
E
b
R
a
=
220
−
200
0.5
=
40
A
Suggest Corrections
1
Similar questions
Q.
The armature of
D
C
motor has
20
Ω
resistance. It draws current of
1.5
A
when run by
220
V
DC supply. The value of back emf induced in it will be :
Q.
An electric motor runs on
D
C
source of emf
200
V
and draws a current of
10
A
. If the efficiency be
40
%, then the resistance of armature is
Q.
A DC series motor has linear magnetization and negligible armature resistance. The motor speed is
Q.
A 220V, 10 kW, 900 rpm separately excited DC motor has an armature resistance
R
a
=
0.02
Ω
. When the motor operates at rated speed and with rated terminal voltage, the electromagnetic torque developed by motor is 70 N - m. Neglecting the rotational losses of the machine, the current drawn by the motor from 220 V supply is
Q.
A DC series motor gave the following open circuit curve at a speed of 600 rpm.
Field current (A)
10
20
30
40
60
80
Open circuit voltage (V)
103.5
158
206
230
259
282
Total resistance of armature and field circuit is 1
Ω
. The motor is connected to 250 V supply. The speed of motor when the armature current is 40 A is________rpm.
(Neglect losses in core and friction, windage loss)
Join BYJU'S Learning Program
Grade/Exam
1st Grade
2nd Grade
3rd Grade
4th Grade
5th Grade
6th grade
7th grade
8th Grade
9th Grade
10th Grade
11th Grade
12th Grade
Submit
Related Videos
Inductive Circuits
PHYSICS
Watch in App
Explore more
Inductors in Circuits
Standard XII Physics
Join BYJU'S Learning Program
Grade/Exam
1st Grade
2nd Grade
3rd Grade
4th Grade
5th Grade
6th grade
7th grade
8th Grade
9th Grade
10th Grade
11th Grade
12th Grade
Submit
AI Tutor
Textbooks
Question Papers
Install app