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If NP and NS are respectively no. of tur...

If `N_P` and `N_S` are respectively no. of turns in primary and secondary coil then for step up transformer,

A

`N_S gt N_P`

B

`N_S lt N_P`

C

`N_S =N_P`

D

`N_P=2N_S`

Text Solution

Verified by Experts

The correct Answer is:
A
Because `epsilon_S/epsilon_P=N_S/N_P`
For step up transformer `epsilon_S gt epsilon_P rArr N_S gt N_P`
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KUMAR PRAKASHAN-ALTERNATING CURRENTS -SECTION-D MCQs (DARPAN BASED ON TEXTBOOK)
  1. Which of following quantities remains constant in transformer ?

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  2. Working of a transformer is based upon principle of …...

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  3. If NP and NS are respectively no. of turns in primary and secondary co...

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  4. Transformation ratio of one transformer is 1:2. If Leclanche cell havi...

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  5. 240 A.C. mains supply is given to one transformer which draws 0.7 A fr...

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  6. If the coils of a transformer are made up of thick wire, then ...

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  7. Which device is used to increase or decrease A.C. voltage ?

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  8. A step up transformer has transformation ratio of 3: 2. What is the vo...

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  9. A step-up transformer operates on a 230V line and supplies 2A to a loa...

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  10. 240 A.C. mains supply is given to one transformer which draws 0.7 A fr...

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  11. The ratio of primary and secondary turns in a transformer is 1: 200. I...

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  12. The ratio of primary and secondary turns in a transformer is 3:2, if 3...

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  13. If current is not obtained from secondary coil of an ideal transformer...

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  14. If number of turns in primary and secondary coils is increased to two ...

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  15. If for an ideal step-up transformer current in primary is IP and curre...

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  16. A transformer has an efficiency of 80%. It works at 100V and 4kW. If s...

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  17. For step-down transformer value of transformation ratio is ……….

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  18. In a step-up transformer, use of 120 V line provides a potential diffe...

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  19. In a noiseless transformer, an alternating current of 2A is flowing in...

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  20. A low loss transformer has 250 V applied to primary and gives 4.6 V in...

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