Tag: fuse

Questions Related to fuse

Fuse wire is a

physics electric current and its effects electric fuse electrical fuse and mcb fuse

  1. tin-lead alloy

  2. copper-lead alloy

  3. tin-copper alloy

  4. silver-lead alloy

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Correct Option: A
Explanation:
Fuse wire is made of a tin-lead alloy and not copper because of the following reasons:

1. They have high resistance due to high resistance the wire heats up quickly, when large current flows.

Heating power of wire $P=i^2R$

2. They have low melting point which melts and breaks off the circuit if the current is larger than the safety limit.



In Fuse wire a copper wire can not be used because it has a high melting point. Copper wire will not melt easily when a high electric current passes through it and may harm the electrical appliances attached to it.

State whether true or false.
A fuse is always connected to the neutral wire in a household circuit.

physics electric current and its effects electric fuse electrical fuse and mcb fuse

  1. True

  2. False

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Correct Option: B
Explanation:

A fuse is always connected to the neutral wire.T his statement is false. Fuse is connected to live wire.

Fuse is always connected to the ______ wire.

physics electric current and its effects electric fuse electrical fuse and mcb fuse

  1. live

  2. neutral

  3. earth

  4. green

Show answer
Correct Option: A
Explanation:

Fuse is always connected to live wire. The purpose of a fuse is to protect the wiring and equipment from overloading

State whether true or false.
When a short-circuit takes place, the fuse wire melts and breaks the electric circuit.

physics electric current and its effects electric fuse electrical fuse and mcb fuse

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Yes,given statement is true, because short-cicuiting is an  excessive current flow in the power source through the short due to which the fuse wire melts and breaks the electric circuit.

Therefore, A is correct option

A fuse is connected to the

physics electric current and its effects electric fuse electrical fuse and mcb fuse

  1. Live wire

  2. Neutral wire

  3. Earth wire

  4. None of these

Show answer
Correct Option: A
Explanation:

Fuses are always connected in series with the components to be protected from overcurrent, so that when the fuse blows (opens) it will open the entire circuit and stop current through the components. A fuse connected in one branch of a parallel circuit, of course, would not affect current through any of the other branches.

State whether true or false.
Fuses should be connected to the neutral wire.

physics electric current and its effects electric fuse electrical fuse and mcb fuse

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

Fuses should be connected to the neutral wire.T his statement is false fuses should be connected to live wire.

Fuses used in a household generally have a rating of:

physics electric current and its effects electric fuse electrical fuse and mcb fuse

  1. 500A

  2. 5A

  3. 30A

  4. 220A

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Correct Option: B
Explanation:

Fuses used in household generally have a rating of 5A to prevent fuse to melt and prevent circuit to break.

If a fuse is rated as 8 A, and current more than 8 A passes through it then

physics electric current and its effects electric fuse electrical fuse and mcb fuse

  1. it would melt

  2. circuit gets broken

  3. both

  4. none

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Correct Option: C
Explanation:

The maximum current which can flow through a fuse without melting it is called its rating.for example a fuse rated at 8A,can stand current upto 8 A. If current higher than 8 A flows through the fuse, it would melt and circuit gets broken the rating of a fuse depends upon the thickness of the fuse wire (because length of the wire is fixed). The thicker fuse has higher rating. So, the thickness of the fuse wire in 8 A circuit is more than that of the fuse wire in 5 A circuit.

Material used in fuse wire must have

physics electric current and its effects electric fuse electrical fuse and mcb fuse

  1. high melting point

  2. low melting point

  3. high resistance

  4. none

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Correct Option: B
Explanation:

A fuse is a piece of thin wire of a material having low melting point, high resistance. It is based in heating effect on current.

Fuse wire is made up of

physics electric current and its effects electric fuse electrical fuse and mcb fuse

  1. Alloy

  2. Mixture

  3. Metals

  4. Non metals

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Correct Option: A
Explanation:

Fuse is generally made up of  an alloy of tin and lead. It is used in series with an appliance to prevent it from damage when excessive flows through the appliance. Material to be used in fuse wire must have Low melting point, low boiling point and high electric resistance.