Class 11 Electronics Chapter 5 Cabling

Class 11 Electronics Chapter 5 Cabling Solutions English Medium As Per AHSEC New Syllabus to each chapter is provided in the list so that you can easily browse through different chapters Class 11 Electronics Chapter 5 Cabling Question Answer and select need one. Class 11 Electronics Chapter 5 Cabling Notes Download PDF. AHSEC Class 11 Elective Electronics Question Answer English Medium.

Class 11 Electronics Chapter 5 Cabling

Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. AHSEC Class 11 Electronics Textual Solutions are part of All Subject Solutions. Here we have given AHSEC Class 11 Electronics Textbook Solutions English Medium for All Chapters, You can practice these here.

Cabling

Chapter: 5

CHECK YOUR PROGRESS

A. Multiple choice questions: 

1. Thickness of the layer of insulation on the conductor in cables depends on __________________. 

(a) Reactive power. 

(b) Power factor. 

(c) Voltage.

(d) Current carrying capacity. 

Ans: (c) Voltage.

2. Which of the following protects a cable against mechanical injury? 

(a) Bedding. 

(b) Sheath. 

(c) Armour. 

(d) None of the above.

Ans: (c) Armour.

3. Which of the following insulation is used in cables? 

(a) Varnished cambric. 

(b) Rubber. 

(c) Paper. 

(d) All of the above.

Ans: (a) Varnished cambric. 

4. PVC stands for __________________. 

(a) Polyvinyl chloride. 

(b) Post varnish conductor. 

(c) Pressed and varnished cloth. 

(d) Positive voltage conductor.

Ans: (a) Polyvinyl chloride.

5. Which of the following colour codes is used for live wire? 

(a) Grey. 

(b) Red.

(c) Green. 

(d) Black. 

Ans: (b) Red.

6. In cables, sheaths are used to __________________. 

(a) Prevent the cable from moisture. 

(b) Provide strength. 

(c) Provide insulation. 

(d) None of the above.

Ans: (a) Prevent the cable from moisture. 

7. Material used for armouring on the cable is ________________. 

(a) Steel tape. 

(b) Galvanised steel wire. 

(c) Both (a) and (b). 

(d) None of the above. 

Ans: (c) Both (a) and (b).

8. Which colour wire is used as neutral? 

(a) Red.

(b) Black. 

(c) Green. 

(d) White. 

Ans: (b) Black.

9. Which colour wire is used as earth? 

(a) Red. 

(b) Black.

(c) Green.

(d) White.

Ans: (c) Green.

10. Which cable uses light for transmission? 

(a) Coaxial cable. 

(b) Optics fibre cable.

(c) PVC cable. 

(d) XLPE cable.

Ans: (b) Optics fibre cable.

B. Fill in the blanks: 

1. Green or green with yellow stripes is used as ________________ wire. 

Ans: Earth.

2. Blue wires are also used as hot wires. They contain line voltage and are also called _______________ wire. 

Ans: Phase or line or live.

3. Black wire is used for _________________.

Ans: Neutral.

4. _______________ optic cables have very narrow diameter core (i.e., around 8–10 micrometre). 

Ams: Single core fibre.

5. Coaxial cable is commonly used to carry _______________ signals. 

Ans: Radio frequency.

6. Low-tension cables are heavy duty. They are used for working voltage from ________________. 

Ans:  650 to 1100 volts.

7. ________________ is the most common thermoset material used as protecting cover of power cable. 

Ans: Cross linked polyethylene.

8. Multi core optics fibre cable has a wider diameter core, i.e., around ______________ micrometre. 

Ans: 50-100.

9. Fibre optics is the science of ________________ transmission through a very fine glass or plastic fibres. 

Ans: Light .

10. Cross linked polyethylene is the most commonly used ________________ material.

Ans: Thermoset.

C. State whether the following statements are True or False: 

1. Bend radius is the minimum radius at which one can bend a cable without making any kink or causing damage. 

Ans: True.

2. In selecting and applying cables at medium voltage, a major consideration involves whether the cable should be shielded or non-shielded. 

Ans: True.

3. Many times, cable insulation is damaged or weakened during installation by applying incorrect pulling tension. 

Ans: True.

4. Conductors, such as copper and aluminium, are used for power distribution. 

Ans: True.

5. Coaxial cable is used for radio communication. 

Ans: True.

6. Black wire is used for earth. 

Ans: False.

7. Red wire is used as neutral wire. 

Ans: False.

8. Green wire is used for earthing. 

Ans: True.

9. PVC is not used as an insulator in wire. 

Ans: False.

10. Optical fibre uses light as a medium of transmission.

Ans: True.

D. Short answer questions:

1. List the various types of cable.

Ans: The cables used may be grouped according to: 

(i) Conductor. 

(ii) Number of cores.

(iii) Voltage rating.

(iv) Type of insulation used.

2. What is a PVC power cable?

Ans: Polyvinyl chloride (PVC) is a thermoplastic material. It is used for making power cables. It acts as an insulator and can be used for covering the conductor in the cable.

3. What is XLPE power cable?

Ans: Cross linked polyethylene (XLPE) is the most commonly used thermoset material. It is used for making power cables. It acts as an insulator and protecting cover for the power cable.

4. Write the difference between PVC and XLPE power cable.

Ans: The difference between PVC and XLPE power cable are as under:

PVC	XLPE
Polyvinyl Chloride	Cross-Linked Polyethylene
Under short circuit conditions, it can withstand temperatures up to 160 degrees Celsius.	Under short circuit conditions, it can withstand temperatures up to 250 degrees Celsius.
Up to 70°C	Up to 90°C
Comparatively lower	Higher mechanical strength
Low moisture resistance	High moisture resistance

5. What do you understand by colour coding of cables?

Ans: For a wireman, it is important to be able to identify wires on the basis of colour. By looking at the wire colour, the person can identify the phase, neutral and earth wires. Therefore, the wireman needs to understand the colour coding of wires. Colour coding of a wire represents the purpose for which it is to be used.

In India, generally, the following colour code is used:

(i) Red, yellow and blue for three phases.

(ii) Black for neutral.

(iii) Green for earth”.

6. What is the importance of bending in cabling?

Ans: The bend radius refers to the minimum radius at which a cable can be bent without causing any kink or physical damage. A smaller bend radius indicates greater flexibility of the cable material. Maintaining the proper bend radius is essential, especially when handling sensitive cables such as optical fibre cables, to prevent breakage or signal loss.

The bend radius is different for different types of cables. If the company does not tell us how much to bend, we should bend the cable in a round shape that is at least 15 times bigger than the cable’s thickness. This helps to keep the cable safe and working well for a long time.

7. On what factors does the cable size depend?

Ans: Cable size depends on the following factors:

(i) Current carrying capacity.

(ii) Length of the cable.

(iii) Voltage drop.

(iv) Power loss.

(v) Environmental conditions.

8. What is optics fibre cable?

Ans: Optics fibre cable Fibre optics is the science of light transmission through fine glass or plastic fibre. Optics fibre cables  have various applications due to their inherent advantage over copper conductors.

9. Define single core and multi core fibre cable.

Ans:These cables are available in single mode and multi mode:

(i) Single mode optics fibre cables have a small core diameter (i.e., around 8–10 micrometre) through which only one ray of light can be transmitted. 

(ii) Multi mode optics fibre cables have a wider core diameter (i.e., around 50–100 micrometre) through which one or more rays of light can be transmitted.

10. Which factors affect cable selection?

Ans: The five factors listed—

(i) Cable installation.

(ii) Cable construction.

(iii) Cable operation.

(iv) Cable size.

(v) Shielding.

11. What steps must be followed for cable routing?

Ans: It is the way of placing cables. Routing protect the cables from harsh weather conditions. While routing cables, one must do the following:

(i) Route the cable to the longest distance first.

(ii) Use the diagram to plan the routing of the cables.

(iii) Cut the unlabeled cable. Label all cables before routing them, else one may lose track.

(iv) Make sure that the cable is not stretched or pinched.

(v) Make sure to leave the corners of the cable uncut. One must leave ample slack.

(vi) Use electrical tape to attach the two cable ends and the end of the pull string together.