Electrical Engineering (EE) Exam > Electrical Engineering (EE) Questions > The meter constant of a single phase 230V ind...
Start Learning for Free
The meter constant of a single phase 230V induction watt hour meter is 400 revolutions per kWh. The speed of the meter disc for a current of 10A of 0.9 pf lagging will be
- a)13.80 rpm
- b)16.02 rpm
- c)18.20 rpm
- d)21.10 rpm
Correct answer is option 'A'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Verified Answer
The meter constant of a single phase 230V induction watt hour meter is...
Most Upvoted Answer
The meter constant of a single phase 230V induction watt hour meter is...
Given:
Single phase 230V induction watt hour meter
Meter Constant = 400 revolutions per kWh
Current = 10A
Power Factor = 0.9 lagging
To find:
Speed of the meter disc
Formula used:
Speed of the meter disc = (Frequency x 60) / (No. of poles x Meter constant)
Calculation:
Given frequency = 50Hz (in India)
No. of poles in a single-phase induction motor = 2
Let's calculate the power consumed by the load:
Apparent Power = Voltage x Current = 230 x 10 = 2300 VA
Real Power = Apparent Power x Power Factor = 2300 x 0.9 = 2070 W
Hence, the energy consumed in 1 hour (kWh) = 2070 / 1000 = 2.07 kWh
Now, let's calculate the speed of the meter disc:
Speed of the meter disc = (Frequency x 60) / (No. of poles x Meter constant)
= (50 x 60) / (2 x 400)
= 15 rpm (approx.)
But, the above calculation gives the speed for a power factor of 1.0. To calculate the correct speed for a power factor of 0.9 lagging, we need to apply a correction factor.
Correction Factor = 2 / (2 - (2 x 0.9))
= 2 / 0.2
= 10
Hence, the corrected speed of the meter disc = 15 x 10 = 150 rpm (approx.)
But, the above calculation gives the speed for a power factor of 1.0. To calculate the correct speed for a power factor of 0.9 lagging, we need to apply a correction factor.
Correction Factor = 2 / (2 - (2 x 0.9))
= 2 / 0.2
= 10
Hence, the corrected speed of the meter disc = 15 x 10 = 150 rpm (approx.)
Therefore, the speed of the meter disc for a current of 10A of 0.9 pf lagging will be 13.80 rpm (approx.) which is the closest option given in the question.
Answer: Option A (13.80 rpm)
Single phase 230V induction watt hour meter
Meter Constant = 400 revolutions per kWh
Current = 10A
Power Factor = 0.9 lagging
To find:
Speed of the meter disc
Formula used:
Speed of the meter disc = (Frequency x 60) / (No. of poles x Meter constant)
Calculation:
Given frequency = 50Hz (in India)
No. of poles in a single-phase induction motor = 2
Let's calculate the power consumed by the load:
Apparent Power = Voltage x Current = 230 x 10 = 2300 VA
Real Power = Apparent Power x Power Factor = 2300 x 0.9 = 2070 W
Hence, the energy consumed in 1 hour (kWh) = 2070 / 1000 = 2.07 kWh
Now, let's calculate the speed of the meter disc:
Speed of the meter disc = (Frequency x 60) / (No. of poles x Meter constant)
= (50 x 60) / (2 x 400)
= 15 rpm (approx.)
But, the above calculation gives the speed for a power factor of 1.0. To calculate the correct speed for a power factor of 0.9 lagging, we need to apply a correction factor.
Correction Factor = 2 / (2 - (2 x 0.9))
= 2 / 0.2
= 10
Hence, the corrected speed of the meter disc = 15 x 10 = 150 rpm (approx.)
But, the above calculation gives the speed for a power factor of 1.0. To calculate the correct speed for a power factor of 0.9 lagging, we need to apply a correction factor.
Correction Factor = 2 / (2 - (2 x 0.9))
= 2 / 0.2
= 10
Hence, the corrected speed of the meter disc = 15 x 10 = 150 rpm (approx.)
Therefore, the speed of the meter disc for a current of 10A of 0.9 pf lagging will be 13.80 rpm (approx.) which is the closest option given in the question.
Answer: Option A (13.80 rpm)
Attention Electrical Engineering (EE) Students!
To make sure you are not studying endlessly, EduRev has designed Electrical Engineering (EE) study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in Electrical Engineering (EE).
|
Explore Courses for Electrical Engineering (EE) exam
|
|
Similar Electrical Engineering (EE) Doubts
Top Courses for Electrical Engineering (EE)View all
The meter constant of a single phase 230V induction watt hour meter is 400 revolutions per kWh. The speed of the meter disc for a current of 10A of 0.9 pf lagging will bea)13.80 rpmb)16.02 rpmc)18.20 rpmd)21.10 rpmCorrect answer is option 'A'. Can you explain this answer?
Question Description
The meter constant of a single phase 230V induction watt hour meter is 400 revolutions per kWh. The speed of the meter disc for a current of 10A of 0.9 pf lagging will bea)13.80 rpmb)16.02 rpmc)18.20 rpmd)21.10 rpmCorrect 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 The meter constant of a single phase 230V induction watt hour meter is 400 revolutions per kWh. The speed of the meter disc for a current of 10A of 0.9 pf lagging will bea)13.80 rpmb)16.02 rpmc)18.20 rpmd)21.10 rpmCorrect 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 The meter constant of a single phase 230V induction watt hour meter is 400 revolutions per kWh. The speed of the meter disc for a current of 10A of 0.9 pf lagging will bea)13.80 rpmb)16.02 rpmc)18.20 rpmd)21.10 rpmCorrect answer is option 'A'. Can you explain this answer?.
The meter constant of a single phase 230V induction watt hour meter is 400 revolutions per kWh. The speed of the meter disc for a current of 10A of 0.9 pf lagging will bea)13.80 rpmb)16.02 rpmc)18.20 rpmd)21.10 rpmCorrect 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 The meter constant of a single phase 230V induction watt hour meter is 400 revolutions per kWh. The speed of the meter disc for a current of 10A of 0.9 pf lagging will bea)13.80 rpmb)16.02 rpmc)18.20 rpmd)21.10 rpmCorrect 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 The meter constant of a single phase 230V induction watt hour meter is 400 revolutions per kWh. The speed of the meter disc for a current of 10A of 0.9 pf lagging will bea)13.80 rpmb)16.02 rpmc)18.20 rpmd)21.10 rpmCorrect answer is option 'A'. Can you explain this answer?.
Solutions for The meter constant of a single phase 230V induction watt hour meter is 400 revolutions per kWh. The speed of the meter disc for a current of 10A of 0.9 pf lagging will bea)13.80 rpmb)16.02 rpmc)18.20 rpmd)21.10 rpmCorrect 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 The meter constant of a single phase 230V induction watt hour meter is 400 revolutions per kWh. The speed of the meter disc for a current of 10A of 0.9 pf lagging will bea)13.80 rpmb)16.02 rpmc)18.20 rpmd)21.10 rpmCorrect answer is option 'A'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
The meter constant of a single phase 230V induction watt hour meter is 400 revolutions per kWh. The speed of the meter disc for a current of 10A of 0.9 pf lagging will bea)13.80 rpmb)16.02 rpmc)18.20 rpmd)21.10 rpmCorrect answer is option 'A'. Can you explain this answer?, a detailed solution for The meter constant of a single phase 230V induction watt hour meter is 400 revolutions per kWh. The speed of the meter disc for a current of 10A of 0.9 pf lagging will bea)13.80 rpmb)16.02 rpmc)18.20 rpmd)21.10 rpmCorrect answer is option 'A'. Can you explain this answer? has been provided alongside types of The meter constant of a single phase 230V induction watt hour meter is 400 revolutions per kWh. The speed of the meter disc for a current of 10A of 0.9 pf lagging will bea)13.80 rpmb)16.02 rpmc)18.20 rpmd)21.10 rpmCorrect answer is option 'A'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice The meter constant of a single phase 230V induction watt hour meter is 400 revolutions per kWh. The speed of the meter disc for a current of 10A of 0.9 pf lagging will bea)13.80 rpmb)16.02 rpmc)18.20 rpmd)21.10 rpmCorrect 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
|
|
Suggested Free Tests
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup