Examveda

A fuse in a motor circuit provides protection against

A. overload

B. short-circuit and overload

C. open circuit, short-circuit and overload

D. none of the above

Answer: Option B

Solution (By Examveda Team)

A fuse in a motor circuit primarily provides protection against short-circuit and overload conditions.

Short-circuit Protection:
In the event of a short-circuit, where a low-resistance path is created between two conductors, a large current surge flows through the circuit. This can damage the motor and other components. The fuse interrupts the circuit when the current exceeds its rated value, preventing damage by quickly melting and opening the circuit.

Overload Protection:
Overload conditions occur when the current drawn by the motor exceeds its rated value for an extended period. This can happen due to mechanical issues, such as increased friction, or electrical issues, such as voltage fluctuations. The fuse protects against overload by melting and opening the circuit when the current exceeds its rated value for a sustained period.

Therefore, Option B correctly identifies that a fuse in a motor circuit provides protection against both short-circuit and overload conditions.

This Question Belongs to Electrical Engineering >> Switchgear Protections

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Comments (1)

  1. Kian Zar
    Kian Zar:
    2 years ago

    this answer is wrong.
    fuses only used for short circut. becuse metal melting reaction operate in very high fault current at minimum time.

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