Home
Class 12
PHYSICS
Assertion : A laminated core is used in ...

Assertion : A laminated core is used in transformers to increase eddy currents.
Reason : The efficiency of a transformer increases with increase in eddy currents.

A

Assertion is correct, reason is correct, reason is a correct explanation for assertion.

B

Assertion is correct, reason is correct, reason is not a correct explanation for assertion

C

Assertion is correct, reason is incorrect

D

Assertion is incorrect, reason is correct

Text Solution

Verified by Experts

The correct Answer is:
D
Large eddy currents are produced in nonlaminated iron core of the transformer by the induced emf, as the resistance of bulk iron core is verysmall. Byusing thin iron sheets as core the resistance is increased. Laminating the core substantially reduces the eddy currents. Eddy current heats up thecore ofthetransformer.More theeddy currents greater is the loss of energy and the efficiency goes down.
Promotional Banner

Topper's Solved these Questions

  • AIIMS 2016

    AIIMS PREVIOUS YEAR PAPERS|Exercise PHYSICS|60 Videos

  • AIIMS 2018 PAPER 1

    AIIMS PREVIOUS YEAR PAPERS|Exercise PHYSICS|37 Videos

Similar Questions

Explore conceptually related problems

Why eddy currents are undesirable in the core of transformers?

Why is the core of a transformer laminated?

Eddy currents are used in

The core of transformer is laminated so that

We can reduce eddy currents in the core of transformer

AIIMS PREVIOUS YEAR PAPERS-AIIMS 2017-PHYSICS
  1. By properly combining two prisms made of different materials, it is po...

    Text Solution

    |

  2. Assertion : When a convex lens (mu(g) = 3//2) of focal length f is ...

    Text Solution

    |

  3. Assertion : Resonance is special case of force vibration in which the ...

    Text Solution

    |

  4. Assertion: Kirchhoff's junction rule can be applied to a juction of se...

    Text Solution

    |

  5. Assertion : When a sphere is rolls on a horizontal table it slows down...

    Text Solution

    |

  6. Assertion : When two semi conductor of p and n type are brought in con...

    Text Solution

    |

  7. Assertion: Ampere’s circuital law is independent of Biot-Savart’s law....

    Text Solution

    |

  8. STATEMENT-1 : Mechanical energy is the sum of macroscopic kinetic & po...

    Text Solution

    |

  9. Assertion : A laminated core is used in transformers to increase eddy ...

    Text Solution

    |

  10. Assertion: In the measurement of physical quantities direct and indire...

    Text Solution

    |

  11. Assertion : The Carnot cycle is useful in understanding the performanc...

    Text Solution

    |

  12. Asseration:Lenz's law violates the principle of conservation of energy...

    Text Solution

    |

  13. Assertion : A bullet is fired from a rifle. If the rifle recoils fre...

    Text Solution

    |

  14. Assertion : Orbital velocity of a satellite is greater than its esca...

    Text Solution

    |

  15. Assertion: In the absence of an external electric field, the dipole mo...

    Text Solution

    |

  16. Assertion : identical springs of steel and copper are equally stretche...

    Text Solution

    |

  17. Assertion: Electromagnets are made of soft iron. Reason: Coercivity ...

    Text Solution

    |

  18. Assertion : The internal energy of a real gas is function of both, t...

    Text Solution

    |

  19. Statement-1: The de-Broglie wavelength of a molecules (in a sample of ...

    Text Solution

    |

  20. Statement-1: Two longitudinal waves given by equation y(1)(x,t)=2asin(...

    Text Solution

    |