Fuses

Q.

A fuse is always connected in the live wire of the circuit. Explain the reason.

Q.

Why does a fuse have high resistance whereas low resistivity?

Q.

The fuse wire has a low melting point.

1. False

2. True

Q. Why is a fuse wire usually encased in a cartridge of porcelain or similar material with metal ends?

Q. If there are 3 wires connected to a plug having 3 pins namely live wire, neutral wire and earth wire...... Then how much wires are connected in 2 pin plug?????is any of the wire missing...

Q.

Electric fuse is always connected in parallel to the electric wiring.

1. True
2. False

Q.

Two fuse wires have ratings of 10A & 13A.

1. 10A fuse wire will be thicker, assuming same length

2. 13A fuse wire will be thicker, assuming same length

3. Both will have same thickness and length

4. Both will have same thickness but 10A fuse will be longer

5. Both will have same thickness but 13A fuse will be longer

Q.

Which material is generally used in a fuse wire?

1. Zinc

2. An alloy of lead and tin

3. Lead

4. An alloy of Zinc and tin

Q.

A motor starter is a

1. fixed resistance

2. variable resistance

3. fixed capacitor

4. none of these

Q.

State two circumstances when one may get an electric shock from an electric gadget. What preventive measure must be provided with the gadget to avoid it?

Q. Which of the following are characteristics of an electric fuse?

1. Greater thickness
2. Lesser thickness
3. High melting point
4. Low melting point

Q.

What are the characteristic properties of a fuse wire? Name the material from which it is made.

Q.

The thinner the fuse wire, the greater its capacity.

1. True
2. False

Q.

Two fuse wires are rated 5 A and 20 A. Which of the two is thicker?

Q.

Choose the correct option.
The purpose of a fuse used in household wiring is

1. to prevent electric shock.
   

2. to distribute electricity in the different parts of the household.

3. to prevent electrical fires

4. to disconnect an electrical appliance when it is not in use.

Q. ____ is a material which break off the electric circuit from the supply in case of a short circuit to protect the circuit.

1. Needle
2. Earth wire
3. Fuse Wire
4. Filament

Q.

We need a fuse for an appliance with a power rating of 1500 watt at 220 V. What should be the current rating of this fuse?

Q. What is the usual current rating of the fuse fire in the line to fed
1.lights and fans
2.appliances of 2kW or more power

Q. Fuse should be connected to ..... wire of the circuit

1. Earth
2. Neutral
3. Phase
4. Any of the above

Q. The material used in making the wire of an electric fuse should have a high melting point.

1. False
2. True

Q. Name the material used for making a fuse wire.

1. Copper
2. Lead and Tin
3. Iron
4. Aluminim

Q. Assertion :Fuse wire must have high resistance and low melting point. Reason: Fuse is used for small current flow only.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Assertion is incorrect but Reason is correct

Q. Match the following:

Section A	Section B
$1$. Fuse	$P.$ Converts electric energy into mechanical energy
$2$ Electric generator	$Q.$ Heating effect of electric current
$3.$ Electric motor	$R.$ Converts mechanical energy into electrical energy

1. $1-Q,2-P,3-R$
2. $1-Q,2-R,3-P$
3. $1-P,2-Q,3-R$
4. $1-P,2-R,3-Q$

Q.

An electric fuse works on the ____________ effect of current.

1. heating

2. magnetic

3. chemical

4. none of these

Q.

An electric kettle consumes $1kW$ of electric power when operated at $220V$. A fuse wire of what rating must be used for it?

Q. An electric fuse works on the ______effect of current.

1. none of these
2. magnetic
3. chemical
4. heating

Q.

2)Suppose you have two fuses of rating 5 A and 15 A .What will be the rating of the combination if they are connected 1)in series 2) in parallel?

Q. A girl was using a comb to straighten her hair. Everytime she brought the comb near, her hair moved. This is due to electricity.

1. False
2. True

Q.

Which wair is used in the Fuse? Give reason.

Q. (i) Name the device used to protect the electric circuits from overloading and short circuits.
(ii) On what effect of electricity does the above device work?