14. The resistance of the field coils of a dynamo is 173 Q at 16 deg C. After working for 6 hours on full-load, the resistance of the coils increases to 212 Q. Calculate the temperature of the coils. Assume temperature coefficient of resistance of copper is 0.00426/deg C at O * deg C. 62.5°C 52.5°C 82.5°C 72 50O

Power System Analysis and Design (MindTap Course List)
6th Edition
ISBN:9781305632134
Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Chapter4: Transmission Line Parameters
Section: Chapter Questions
Problem 4.40P
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14. The resistance of the field
coils of a dynamo is 173 Q at 16
deg C. After working for 6
hours on full-load, the
resistance of the coils
increases to 212 Q. Calculate
the temperature of the coils.
Assume temperature
coefficient of resistance of
copper is 0.00426/deg C at O
deg C.
62.5°C
52.5°C
82.5°C
72.5°C
Transcribed Image Text:14. The resistance of the field coils of a dynamo is 173 Q at 16 deg C. After working for 6 hours on full-load, the resistance of the coils increases to 212 Q. Calculate the temperature of the coils. Assume temperature coefficient of resistance of copper is 0.00426/deg C at O deg C. 62.5°C 52.5°C 82.5°C 72.5°C
13. A transmission line cable
consists of 19 strands of
identical copper conductors,
each 1.5 mm in diameter. The
length of the cable is 2km but
because of the twist of the
strands, the actual length of
each conductor is increased
by 5 percent. What is the
resistance of the cable ? Take
the resistivity of the copper to
be 1.78 x 10^-8 Q-m. *
2.079 Q
1.076 Q
1.546 Q
2.643 Q
Transcribed Image Text:13. A transmission line cable consists of 19 strands of identical copper conductors, each 1.5 mm in diameter. The length of the cable is 2km but because of the twist of the strands, the actual length of each conductor is increased by 5 percent. What is the resistance of the cable ? Take the resistivity of the copper to be 1.78 x 10^-8 Q-m. * 2.079 Q 1.076 Q 1.546 Q 2.643 Q
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