Electrical Engineering (EE) Exam  >  Electrical Engineering (EE) Questions  >  If the speed of rotation for a four pole, 220... Start Learning for Free
If the speed of rotation for a four pole, 220V dc machine is 1 m/s, flux density as 2T having length of bore as 0.1m and radius of 0.5m.The emf induced under pole faces will be
  • a)
    0.2 V
  • b)
    0.1 V
  • c)
    0.2*pi V
  • d)
    220 V
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
If the speed of rotation for a four pole, 220V dc machine is 1 m/s, fl...
E = B*l*v
= 2*0.1*1
= 0.2 Volts.
View all questions of this test
Most Upvoted Answer
If the speed of rotation for a four pole, 220V dc machine is 1 m/s, fl...
EMF Induced in a DC Machine Under Pole Faces

Given:
Speed of rotation (ω) = 1 m/s
Flux density (B) = 2 T
Length of bore (l) = 0.1 m
Radius (r) = 0.5 m

The electromotive force (EMF) induced in a DC machine is given by the formula:

EMF = Φ * Z * ω

Where:
Φ is the flux per pole
Z is the number of conductors
ω is the angular velocity

To find the EMF induced under the pole faces, we need to calculate the flux per pole (Φ).

Flux per pole (Φ) can be calculated using the formula:

Φ = B * A

Where:
B is the flux density
A is the area of the pole face

The area of the pole face can be calculated using the formula:

A = π * r * l

Where:
π is a constant (approximately 3.14)
r is the radius of the pole face
l is the length of the pole face

Calculating the Area of the Pole Face:
A = π * 0.5 * 0.1
A = 0.157 m^2

Calculating the Flux per Pole:
Φ = 2 * 0.157
Φ = 0.314 Wb

Now, we need to calculate the number of conductors (Z).

In a DC machine, the number of conductors is given by the formula:

Z = 2 * P

Where:
P is the number of poles

Given that the machine has four poles, we have:
Z = 2 * 4
Z = 8

Calculating the EMF:
EMF = Φ * Z * ω
EMF = 0.314 * 8 * 1
EMF = 2.512 V

Therefore, the EMF induced under the pole faces is 2.512 V.

Since none of the given options match the calculated value, it seems there may be an error in the question or options provided.
Explore Courses for Electrical Engineering (EE) exam

Top Courses for Electrical Engineering (EE)

If the speed of rotation for a four pole, 220V dc machine is 1 m/s, flux density as 2T having length of bore as 0.1m and radius of 0.5m.The emf induced under pole faces will bea)0.2 Vb)0.1 Vc)0.2*pi Vd)220 VCorrect answer is option 'A'. Can you explain this answer?
Question Description
If the speed of rotation for a four pole, 220V dc machine is 1 m/s, flux density as 2T having length of bore as 0.1m and radius of 0.5m.The emf induced under pole faces will bea)0.2 Vb)0.1 Vc)0.2*pi Vd)220 VCorrect answer is option 'A'. Can you explain this answer? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about If the speed of rotation for a four pole, 220V dc machine is 1 m/s, flux density as 2T having length of bore as 0.1m and radius of 0.5m.The emf induced under pole faces will bea)0.2 Vb)0.1 Vc)0.2*pi Vd)220 VCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for If the speed of rotation for a four pole, 220V dc machine is 1 m/s, flux density as 2T having length of bore as 0.1m and radius of 0.5m.The emf induced under pole faces will bea)0.2 Vb)0.1 Vc)0.2*pi Vd)220 VCorrect answer is option 'A'. Can you explain this answer?.
Solutions for If the speed of rotation for a four pole, 220V dc machine is 1 m/s, flux density as 2T having length of bore as 0.1m and radius of 0.5m.The emf induced under pole faces will bea)0.2 Vb)0.1 Vc)0.2*pi Vd)220 VCorrect answer is option 'A'. Can you explain this answer? in English & in Hindi are available as part of our courses for Electrical Engineering (EE). Download more important topics, notes, lectures and mock test series for Electrical Engineering (EE) Exam by signing up for free.
Here you can find the meaning of If the speed of rotation for a four pole, 220V dc machine is 1 m/s, flux density as 2T having length of bore as 0.1m and radius of 0.5m.The emf induced under pole faces will bea)0.2 Vb)0.1 Vc)0.2*pi Vd)220 VCorrect answer is option 'A'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of If the speed of rotation for a four pole, 220V dc machine is 1 m/s, flux density as 2T having length of bore as 0.1m and radius of 0.5m.The emf induced under pole faces will bea)0.2 Vb)0.1 Vc)0.2*pi Vd)220 VCorrect answer is option 'A'. Can you explain this answer?, a detailed solution for If the speed of rotation for a four pole, 220V dc machine is 1 m/s, flux density as 2T having length of bore as 0.1m and radius of 0.5m.The emf induced under pole faces will bea)0.2 Vb)0.1 Vc)0.2*pi Vd)220 VCorrect answer is option 'A'. Can you explain this answer? has been provided alongside types of If the speed of rotation for a four pole, 220V dc machine is 1 m/s, flux density as 2T having length of bore as 0.1m and radius of 0.5m.The emf induced under pole faces will bea)0.2 Vb)0.1 Vc)0.2*pi Vd)220 VCorrect answer is option 'A'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice If the speed of rotation for a four pole, 220V dc machine is 1 m/s, flux density as 2T having length of bore as 0.1m and radius of 0.5m.The emf induced under pole faces will bea)0.2 Vb)0.1 Vc)0.2*pi Vd)220 VCorrect answer is option 'A'. Can you explain this answer? tests, examples and also practice Electrical Engineering (EE) tests.
Explore Courses for Electrical Engineering (EE) exam

Top Courses for Electrical Engineering (EE)

Explore Courses
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
10M+ students study on EduRev