Question 11 Mark
Two fuse wire of same length are rated 5 A and 20 A. Which of the two is thicker and why?
Answer
View full question & answer→The 20 A fuse wire will be thicker so that its resistance be low.
Questions
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Question 21 Mark
Why is the fuse wire fitted in a porcelain casing?
Answer
View full question & answer→The fuse wire is fitted in a porcelain casing because porcelain is an insulator of electricity.
Question 31 Mark
In following figure shows two bulbs with switches and fuse connected to mains through a socket.
How are the two bulbs joined: in series or in parallel?
How are the two bulbs joined: in series or in parallel?
Answer
View full question & answer→The bulbs are joined in parallel.
Question 41 Mark
Which of the cables, one rated 5 A and the other 15 A will be of thicker wire? Give a reason for your answer.
Answer
View full question & answer→To carry larger current, the resistance of the wire should be low, so its area of cross section should be large. Therefore 15 A current rated wire will be thicker.
Question 51 Mark
Give two characteristic of a high tension wire.
Answer
View full question & answer→A high tension wire has a low resistance and large surface area.
Question 61 Mark
How does the colour code of wires in a cable help in house wiring?
Answer
View full question & answer→The colour coding of wires helps us to connect the switch, fuse, sockets, etc through proper wire in house wiring.
Question 71 Mark
Explain the meaning of the statement ‘the current rating of a fuse is 5 A’.
Answer
View full question & answer→It means that the line to which this fuse is connected has a current carrying capacity of 5 A.
Question 81 Mark
State the function of the following in a house circuiting of main fuse
Answer
View full question & answer→Main fuse is connected in the live wire and in case of high current it gets burnt and cut the connections to save appliances.
Question 91 Mark
At what voltage and frequency is the a.c. supplied to our houses?
Answer
View full question & answer→At 220 V of voltage and 50 Hz of frequency, the a.c. is supplied to our houses.
Question 101 Mark
What is the nature of current transmitted from the power station?
Answer
View full question & answer→The current transmitted from the power station is alternating in nature.
Question 111 Mark
At what voltage and frequency is the electric power generated at the power generating station?
Answer
View full question & answer→The electric power is generated at 11 KV, 50Hz at the power generating station.
Question 121 Mark
Where is the main fuse in a house circuit connected?
Answer
View full question & answer→The main fuse in a house circuit is connected on the distribution board, in live wire before the main switch.