NEET Exam > NEET Questions > A transformer of efficiency 90% draws an inpu...
Start Learning for Free
A transformer of efficiency 90% draws an input power of 4 kW. An electrical appliance connected across the secondary draws a current of 6 A. The impedance of the device is
a)60 Ω
b)50 Ω
c)80 Ω
d)100 Ω
| FREE This question is part of | Download PDF Attempt this Test |
Verified Answer
A transformer of efficiency 90% draws an input power of 4 kW. An elect...
Efficiency, η = Po/Pi with usual notations. Therefore, the output power is given by
Po = η Pi = 0.9 ×4000 W = 3600 W.
In the problem nothing is mentioned about the power factor cos φ. At your level the load is usually assumed to be effectively resistive so that the power factor may be assumed to be unity. Therefore we have
Po = Io2R where R is the load resistance (or, the load impedence in this case).
This gives R = Po /Io2 = 3600 /62 = 100 Ω.
Most Upvoted Answer
A transformer of efficiency 90% draws an input power of 4 kW. An elect...
Free Test
FREE
| Start Free Test |
Community Answer
A transformer of efficiency 90% draws an input power of 4 kW. An elect...
Solution:
Given data:
Efficiency of transformer, η = 90% = 0.9
Input power, P1 = 4 kW
Current drawn by the electrical appliance, I2 = 6 A
To find: Impedance of the device, Z2
We know that,
Efficiency of transformer, η = Output power / Input power
Or, Output power = η x Input power
Or, P2 = 0.9 x 4 kW
Or, P2 = 3.6 kW
We also know that,
Output power, P2 = V2 x I2
Therefore,
V2 = P2 / I2
Or, V2 = 3.6 kW / 6 A
Or, V2 = 600 V
Now,
Impedance of the device, Z2 = V2 / I2
Or, Z2 = 600 V / 6 A
Or, Z2 = 100 Ω
Therefore, the impedance of the device is 100 Ω.
Answer: (d) 100 Ω
Given data:
Efficiency of transformer, η = 90% = 0.9
Input power, P1 = 4 kW
Current drawn by the electrical appliance, I2 = 6 A
To find: Impedance of the device, Z2
We know that,
Efficiency of transformer, η = Output power / Input power
Or, Output power = η x Input power
Or, P2 = 0.9 x 4 kW
Or, P2 = 3.6 kW
We also know that,
Output power, P2 = V2 x I2
Therefore,
V2 = P2 / I2
Or, V2 = 3.6 kW / 6 A
Or, V2 = 600 V
Now,
Impedance of the device, Z2 = V2 / I2
Or, Z2 = 600 V / 6 A
Or, Z2 = 100 Ω
Therefore, the impedance of the device is 100 Ω.
Answer: (d) 100 Ω
Attention NEET Students!
To make sure you are not studying endlessly, EduRev has designed NEET study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in NEET.
|
Explore Courses for NEET exam
|
|
Similar NEET Doubts
Top Courses for NEETView all
A transformer of efficiency 90% draws an input power of 4 kW. An electrical appliance connected across the secondary draws a current of 6 A. The impedance of the device isa)60Ωb)50Ωc)80Ωd)100Ω
Question Description
A transformer of efficiency 90% draws an input power of 4 kW. An electrical appliance connected across the secondary draws a current of 6 A. The impedance of the device isa)60Ωb)50Ωc)80Ωd)100Ω for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about A transformer of efficiency 90% draws an input power of 4 kW. An electrical appliance connected across the secondary draws a current of 6 A. The impedance of the device isa)60Ωb)50Ωc)80Ωd)100Ω covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A transformer of efficiency 90% draws an input power of 4 kW. An electrical appliance connected across the secondary draws a current of 6 A. The impedance of the device isa)60Ωb)50Ωc)80Ωd)100Ω.
A transformer of efficiency 90% draws an input power of 4 kW. An electrical appliance connected across the secondary draws a current of 6 A. The impedance of the device isa)60Ωb)50Ωc)80Ωd)100Ω for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about A transformer of efficiency 90% draws an input power of 4 kW. An electrical appliance connected across the secondary draws a current of 6 A. The impedance of the device isa)60Ωb)50Ωc)80Ωd)100Ω covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A transformer of efficiency 90% draws an input power of 4 kW. An electrical appliance connected across the secondary draws a current of 6 A. The impedance of the device isa)60Ωb)50Ωc)80Ωd)100Ω.
Solutions for A transformer of efficiency 90% draws an input power of 4 kW. An electrical appliance connected across the secondary draws a current of 6 A. The impedance of the device isa)60Ωb)50Ωc)80Ωd)100Ω in English & in Hindi are available as part of our courses for NEET.
Download more important topics, notes, lectures and mock test series for NEET Exam by signing up for free.
Here you can find the meaning of A transformer of efficiency 90% draws an input power of 4 kW. An electrical appliance connected across the secondary draws a current of 6 A. The impedance of the device isa)60Ωb)50Ωc)80Ωd)100Ω defined & explained in the simplest way possible. Besides giving the explanation of
A transformer of efficiency 90% draws an input power of 4 kW. An electrical appliance connected across the secondary draws a current of 6 A. The impedance of the device isa)60Ωb)50Ωc)80Ωd)100Ω, a detailed solution for A transformer of efficiency 90% draws an input power of 4 kW. An electrical appliance connected across the secondary draws a current of 6 A. The impedance of the device isa)60Ωb)50Ωc)80Ωd)100Ω has been provided alongside types of A transformer of efficiency 90% draws an input power of 4 kW. An electrical appliance connected across the secondary draws a current of 6 A. The impedance of the device isa)60Ωb)50Ωc)80Ωd)100Ω theory, EduRev gives you an
ample number of questions to practice A transformer of efficiency 90% draws an input power of 4 kW. An electrical appliance connected across the secondary draws a current of 6 A. The impedance of the device isa)60Ωb)50Ωc)80Ωd)100Ω tests, examples and also practice NEET tests.
|
|
Explore Courses for NEET 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
|
Follow Us
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup