Fuse

Q.

What is an electric fuse? State its purpose in the household electrical circuit.

Q.

State one property of the material of a fuse wire.

Q.

Can we use copper wire as a fuse wire? Give reason.

Q.

Write any five Safety measures that should be adopted while handling Electrical appliances.

Q.

How does a fuse protect the electric wiring (or an appliance) from being damaged?

Q.

Name a safety device which is used to limit the current in an electrical circuit. The use of this device safeguards the circuit and the appliances connected in that circuit from being damaged.

Q.

With which wire, live or neutral, the fuse wire is connected?

Q.

Name the material of a fuse wire.

Q. An electric fuse rated 10 A will melt, if the current through it is

1. = 0 A
2. > 10 A
3. < 10 A
4. = 5 A

Q.

Electric wires that melt quickly and break when large amount of current passes through them are called ______.

1. electric cells

2. bulbs

3. batteries

4. electric fuses

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

Q.

When the live wire and the fuse wire come in contact with each other in a circuit, it causes a/an _________.

1. circuit breaker

2. short circuit

3. overloading

4. earthing

Q. A fuse is always connected to the neutral wire in a household circuit.

1. True
2. False

Q. Fuse wire is an alloy of 60% copper and 40% lead.

1. True
2. False

Q.

How is M.C.B. superior to the fuse wire?

Q. Explain the meaning of the statement 'current rating of a fuse is $5$A'.

Q.

Write the full form of M.C.B.

Q. Which wire could be used as a fuse wire?

1. Nichrome wire
2. Zinc
3. Copper
4. Silver

Q. In an electric circuit, a fuse is connected :

1. in the live wire
2. in the neutral wire
3. in the earth wire
4. Any of these

Q. An electric iron draws a current of 15 A from a 220 V supply. What is the cost of using iron for 30 min everyday for 15 days if the cost of unit (1 unit $=$ 1 k W hr) is 2 rupees?

1. Rs. 60
2. Rs. 49.5
3. Rs. 40
4. Rs. 10

Q. $\left(a\right)$ How does use of fuse wire protect electrical appliances?
$\left(b\right)$ Name factors on which resistance depend?

Q. Which of the following are considered UNSAFE while dealing with electrical equipment?

1. Broken plugs and sockets
2. Wearing no footwear
3. Having wet hands
4. Switching off the mains

Q. At the electric pole, the main fuse is connected in:

1. Neutral wire
2. Earth wire
3. Live wire
4. Both A and C

Q.

What fuse rating would you choose for

(a) A heater of $1KW$ and

(b) An oven of $1500W$ , if the voltage supplied by the main is$220volt$?

Q. What specifications would you select for the material to make a fuse wire?

1. Greater specific heat, low melting point
2. Greater specific heat, high melting point
3. Less specific heat, high melting point
4. Less specific heat, low melting point

Q. Fuse is always connected to the ______ wire.

1. live
2. neutral
3. earth
4. green

Q. Fuses are connected in ________ to the live wire:

1. parallel
2. series
3. either way
4. None

Q. A fuse is connected to the

1. Live wire
2. Neutral wire
3. Earth wire
4. None of these

Q. In electric fuse, some special wire is used, which is having _______ melting point

1. low
2. high
3. moderate
4. very high

Q. A filament of low melting point metal/alloy is used in-

1. Fuse
2. Electric bulb
3. Electric iron
4. Room heater