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An electrical cable having a resistance ...

An electrical cable having a resistance of `0.2Omega` delivers 10kw at 200V D.C to a factory. What is the efficiency of transmission?

A

0.65

B

0.75

C

0.85

D

0.95

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WB JEE PREVIOUS YEAR PAPER-QUESTION PAPER 2009-Multiple Choice Questions (Physics)
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  10. Which of the following materials is the best conductor of electricity?

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  11. One Kg of copper is drawn into a wire of 1mm diameter and a wire of 2m...

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  12. An electrical cable having a resistance of 0.2Omega delivers 10kw at 2...

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  13. A wire of resistance 5Omega is drawn out so that its new length is 3 t...

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  14. Two identical cells each of emf E and internal resistance r are connec...

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  15. To write the decimal number 37 in binary, how many binary digits are r...

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  16. A junction diode has a resistance of 25Omega when forward biased and 2...

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  17. If the electron in a hydrogen atom jumps from an orbit with level n(1)...

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  18. What is the particle x in the following nuclear reaction: ""(4)^(9)Be ...

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  19. An alternating current of rms value 10A is passed through a 12Omega re...

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  20. Which of the following relation represent Biot-Savart's law?

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