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Each one of the following changes will i...

Each one of the following changes will increase emf (or voltage) in a simple generator except :

A

increasing the number of turns in the armature coil

B

winding the coil on a soft iron armature

C

increasing the size of the gap in which the armature turns

D

increasing the speed of rotation

Text Solution

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The correct Answer is:
C
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LAKHMIR SINGH & MANJIT KAUR-MAGNETIC EFFECT OF ELECTRIC CURRENT -Exercise
  1. The essential difference between an AC generator and a DC generator is...

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  2. When the switch S is closed in the figure given below, the pointer of ...

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  3. Each one of the following changes will increase emf (or voltage) in a ...

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  4. An electric generator converts :

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  5. A d.c. generator is based on the priciple of :

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  6. An idduced emf is produced when a magnet is plunged into a coil. The m...

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  7. The frequency of direct current (d.c.) is :

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  8. The frequency of alternating current (a.c.) supply in India is :

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  9. When the magnet shown in the diagram below is movoing towards the co...

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  10. If you hold a coil of wire next to a magnet,no current will flow i...

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  11. The wire in Figure below is being moved downwards through the mag...

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  12. Two coils A and B of insulated to wire are kept close to each ...

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  13. A portable radio has a built in transformer so that it can work f...

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  14. What name is given to the device which automatically cuts off the ...

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  15. What is the capacity of an electric fuse used in (i) lighting circuit ...

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  16. Given the symbol of an electric fuse used in circuit diagrams.

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  17. State whether the following statements are ture of false: (a) A wi...

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  18. What is the advantage of the third wire of each connection in domestic...

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  19. List the colours of the three wires in the cable connected to the p...

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  20. If fuse of 250 mA, 500 mA, 1 A, 5 A, and 10 A were available, which ...

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