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Electrician
DC GENERATOR
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1) Calculate the induced emf of 4 pole dynamo having 1000 rpm lap wound and total number of conductors is 600, the flux / pole is 0.064 wb?

160V 320V 480V 640V

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Correct Answer: 640V

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1) Calculate the induced emf of 4 pole dynamo having 1000 rpm lap wound and total number of conductors is 600, the flux / pole is 0.064 wb?

160V

320V

480V

640V

2) What is the effect on induced emf if the main field flux get distorted in DC generator?

Induced emf increases Induced emf decreases No change in induced emf Induced emf becomes zero

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Correct Answer: Induced emf decreases

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2) What is the effect on induced emf if the main field flux get distorted in DC generator?

Induced emf increases

Induced emf decreases

No change in induced emf

Induced emf becomes zero

3) What is the cause for heavy sparking in brushes of DC generator?

Short circuit in field winding Short circuit in armature winding MNA and GNA position changed Too much spring tension at brush

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Correct Answer: MNA and GNA position changed

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3) What is the cause for heavy sparking in brushes of DC generator?

Short circuit in field winding

Short circuit in armature winding

MNA and GNA position changed

Too much spring tension at brush

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