Electric Fuse

Q. Write five difference between a M.C.B and a Fuse?

Q.

Define fuse and its uses.

Q.

Why is fuse wire used in electric circuits?

1. For protection against electric shock

2. For the protection of electrical appliances and circuit

3. To prevent insulation

4. For the protection of ammeter

Q. What is a safety device to protest us from electric shock.

Q.

Choose the statement which is not correct in the case of an electric fuse.

1. Fuses are inserted in electric circuits of all buildings.

2. There is a maximum limit on the current that can safely flow through the electric circuits.

3. There isnt a minimum limit on the current that can safely flow in the electric circuits.

4. If a proper fuse is inserted in a circuit it will blow off if the current exceeds the safe limit.

Q. Choose the statement which is not correct in the case of an electric fuse.

1. 
   There is a maximum limit on the current which can safely flow through the electric circuit.
2. Fuse works on the principle of heating effect of electric current.
3. Fuse wire has a low melting point.
4. There is a minimum limit on the current which can safely flow in the electric circuit.

Q.

Which one is correct for fuse wire?

1. Low resistance and low melting point

2. High resistance and high melting point

3. High resistance and low melting point

4. Low resistance and high melting point

Q.

The commonly used safety fuse wire is made of

1. copper

2. lead

3. nickel

4. an alloy of tin and lead

Q.

Why do we need fuses? What can be used instead of a fuse? [2 MARKS]

Q. When you have in a domestic wiring what is the advantage if all the appliances and Gadgets have individual fuse

Q. Which of the following is not a function of a fuse?

1. Breaking the circuit
2. Preventing damage to electrical appliances
3. Preventing low current to flow through the circuit
4. Preventing possible fire
   

Q.

The alloy is used in the electric fuse while soldering.

Q.

An electrician is carrying out some repairs in a building. He wants to replace a fuse by a piece of wire. Would you agree with the electrician? Give reasons for your response.

Q.

For a fuse rated at 5A, the fuse melts if the current in the circuit exceeds 5A.

Say True or False.

1. True

2. False

Q.

For a fuse rated at 5A, the fuse melts if the current in the circuit exceeds 5A.

1. True

2. False

Q.

Define electric fuse.

Q.

Explain the mechanism of working of a fuse?

Q. Name a safety device used in the electric circuit. What is the function of a safety device?

Q.

In a given electrical circuit which of the following should melt first to protect the circuit:

1. Connecting Wire

2. Either of the above

3. Filament

4. Fuse

Q. Which of the following is not the function of a fuse?

1. Breaking the circuit
2. Preventing damage to electrical appliances
3. Preventing low current to flow through the circuit
4. Preventing possible fire

Q.

Where the main fuse in a house circuit is connected?

Q.

Name the material required for making a fuse wire.

Q.

A fuse is made up of an alloy of materials having a low melting point. Why the melting point should be low?

Q. Length of a side and two diagonals of a quadrilateral are given. Which one represents the measurements of a rhombus? [4 MARKS]

Q.

Statement 1: A fuse is a safety device which prevents damages to electrical circuits and possible fires.​
Statement 2: Fuse works on the principle of heating effect ​of electric current.​

1. Both statements are incorrect.​
2. Only statement 1 is correct.​
3. Only statement 2 is correct.​
4. Both statements are correct.​

Q.

How does the use of fuse wire protect electrical appliances?

Q.

Name the material which is used as a fuse wire.

Q.

What is a fuse?

Q. An electrician is carrying out repairs in your house. He wants to replace a fuse with a piece of wire.Would you agree? Explain. [3 marks]

Q. For a fuse rated at X, it melts if the current flow in the circuit exceeds X.

1. True
2. False