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A 5kv, 25Hz, single phase transformer has copper, hysteresis, and eddy current losses of 1.4 , 0.6, ,0.5. Percent of full load output. If operated on 10kv , 50Hz system , The percentage copper , hysteresis and eddy current losses, with same current in the windings is
A. 1.4, ,0.6,0.5. B. 0.7,1.2,1.0
C. 0.7,0.6,1.0. D. 1.4,0.6,1.0
Answer with solution.?
A. 1.4, ,0.6,0.5. B. 0.7,1.2,1.0
C. 0.7,0.6,1.0. D. 1.4,0.6,1.0
Answer with solution.?
Most Upvoted Answer
A 5kv, 25Hz, single phase transformer has copper, hysteresis, and eddy...
Solution:
Given data:
Voltage rating (V1) = 5 kV
Frequency (f1) = 25 Hz
Copper loss = 1.4%
Hysteresis loss = 0.6%
Eddy current loss = 0.5%
Now, the transformer is operated at a new voltage rating (V2) = 10 kV and frequency (f2) = 50 Hz.
We know that copper loss is proportional to the square of the current and frequency. Therefore, the percentage copper loss at the new voltage and frequency will be:
% Copper loss = (V1/V2)^2 x (f1/f2) x Copper loss at V1 and f1
% Copper loss = (5/10)^2 x (25/50) x 1.4 = 0.7%
Similarly, hysteresis loss and eddy current loss are proportional to the volume of the core and the square of the frequency. Therefore, the percentage hysteresis loss and eddy current loss at the new voltage and frequency will be:
% Hysteresis loss = (V1/V2)^2 x (f1/f2) x Hysteresis loss at V1 and f1
% Hysteresis loss = (5/10)^2 x (25/50) x 0.6 = 0.3%
% Eddy current loss = (V1/V2)^2 x (f1/f2) x Eddy current loss at V1 and f1
% Eddy current loss = (5/10)^2 x (25/50) x 0.5 = 0.25%
Therefore, the percentage copper, hysteresis, and eddy current losses at the new voltage and frequency are:
A. 1.4, 0.6, 0.5
B. 0.7, 1.2, 1.0
C. 0.7, 0.6, 1.0
D. 1.4, 0.6, 1.0
Answer: C. 0.7, 0.6, 1.0
Given data:
Voltage rating (V1) = 5 kV
Frequency (f1) = 25 Hz
Copper loss = 1.4%
Hysteresis loss = 0.6%
Eddy current loss = 0.5%
Now, the transformer is operated at a new voltage rating (V2) = 10 kV and frequency (f2) = 50 Hz.
We know that copper loss is proportional to the square of the current and frequency. Therefore, the percentage copper loss at the new voltage and frequency will be:
% Copper loss = (V1/V2)^2 x (f1/f2) x Copper loss at V1 and f1
% Copper loss = (5/10)^2 x (25/50) x 1.4 = 0.7%
Similarly, hysteresis loss and eddy current loss are proportional to the volume of the core and the square of the frequency. Therefore, the percentage hysteresis loss and eddy current loss at the new voltage and frequency will be:
% Hysteresis loss = (V1/V2)^2 x (f1/f2) x Hysteresis loss at V1 and f1
% Hysteresis loss = (5/10)^2 x (25/50) x 0.6 = 0.3%
% Eddy current loss = (V1/V2)^2 x (f1/f2) x Eddy current loss at V1 and f1
% Eddy current loss = (5/10)^2 x (25/50) x 0.5 = 0.25%
Therefore, the percentage copper, hysteresis, and eddy current losses at the new voltage and frequency are:
A. 1.4, 0.6, 0.5
B. 0.7, 1.2, 1.0
C. 0.7, 0.6, 1.0
D. 1.4, 0.6, 1.0
Answer: C. 0.7, 0.6, 1.0
Community Answer
A 5kv, 25Hz, single phase transformer has copper, hysteresis, and eddy...
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A 5kv, 25Hz, single phase transformer has copper, hysteresis, and eddy current losses of 1.4 , 0.6, ,0.5. Percent of full load output. If operated on 10kv , 50Hz system , The percentage copper , hysteresis and eddy current losses, with same current in the windings is A. 1.4, ,0.6,0.5. B. 0.7,1.2,1.0 C. 0.7,0.6,1.0. D. 1.4,0.6,1.0 Answer with solution.?
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A 5kv, 25Hz, single phase transformer has copper, hysteresis, and eddy current losses of 1.4 , 0.6, ,0.5. Percent of full load output. If operated on 10kv , 50Hz system , The percentage copper , hysteresis and eddy current losses, with same current in the windings is A. 1.4, ,0.6,0.5. B. 0.7,1.2,1.0 C. 0.7,0.6,1.0. D. 1.4,0.6,1.0 Answer with solution.? 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 A 5kv, 25Hz, single phase transformer has copper, hysteresis, and eddy current losses of 1.4 , 0.6, ,0.5. Percent of full load output. If operated on 10kv , 50Hz system , The percentage copper , hysteresis and eddy current losses, with same current in the windings is A. 1.4, ,0.6,0.5. B. 0.7,1.2,1.0 C. 0.7,0.6,1.0. D. 1.4,0.6,1.0 Answer with solution.? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A 5kv, 25Hz, single phase transformer has copper, hysteresis, and eddy current losses of 1.4 , 0.6, ,0.5. Percent of full load output. If operated on 10kv , 50Hz system , The percentage copper , hysteresis and eddy current losses, with same current in the windings is A. 1.4, ,0.6,0.5. B. 0.7,1.2,1.0 C. 0.7,0.6,1.0. D. 1.4,0.6,1.0 Answer with solution.?.
A 5kv, 25Hz, single phase transformer has copper, hysteresis, and eddy current losses of 1.4 , 0.6, ,0.5. Percent of full load output. If operated on 10kv , 50Hz system , The percentage copper , hysteresis and eddy current losses, with same current in the windings is A. 1.4, ,0.6,0.5. B. 0.7,1.2,1.0 C. 0.7,0.6,1.0. D. 1.4,0.6,1.0 Answer with solution.? 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 A 5kv, 25Hz, single phase transformer has copper, hysteresis, and eddy current losses of 1.4 , 0.6, ,0.5. Percent of full load output. If operated on 10kv , 50Hz system , The percentage copper , hysteresis and eddy current losses, with same current in the windings is A. 1.4, ,0.6,0.5. B. 0.7,1.2,1.0 C. 0.7,0.6,1.0. D. 1.4,0.6,1.0 Answer with solution.? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A 5kv, 25Hz, single phase transformer has copper, hysteresis, and eddy current losses of 1.4 , 0.6, ,0.5. Percent of full load output. If operated on 10kv , 50Hz system , The percentage copper , hysteresis and eddy current losses, with same current in the windings is A. 1.4, ,0.6,0.5. B. 0.7,1.2,1.0 C. 0.7,0.6,1.0. D. 1.4,0.6,1.0 Answer with solution.?.
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