Class 11 Electronics Chapter 6 Electrical safety

Class 11 Electronics Chapter 6 Electrical safety 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 6 Electrical safety Question Answer and select need one. Class 11 Electronics Chapter 6 Electrical safety Notes Download PDF. AHSEC Class 11 Elective Electronics Question Answer English Medium.

Class 11 Electronics Chapter 6 Electrical safety

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.

Electrical safety

Chapter: 6

CHECK YOUR PROGRESS

A. Multiple choice questions: 

1. Appliances of which class have no protective earth connection and feature only a single level of insulation between live parts and exposed metal work. 

(a) Class 0. 

(b) Class 1.

(c) Class 2. 

(d) Class 3. 

Ans: (a) Class 0. 

2. Sudden build-up of static electricity when two differently charged objects are brought together is called ________________. 

(a) Electrostatic energy. 

(b) Electron motion. 

(c) Electrostatic discharge. 

(d) Electrostatic potential. 

Ans: (c) Electrostatic discharge. 

3. Which tool is used for removing insulation from the wire? 

(a) Screwdriver. 

(b) Pliers.

(c) Nose pliers. 

(d) Stripper.

Ans: (d) Stripper.

4. ESD stands for ___________________. 

(a) Electrostate display. 

(b) Electrostatic display. 

(c) Electrostatic discharge. 

(d) Electrostate discharge.

Ans: (c) Electrostatic discharge.

5. Double insulated or _________________ electrical appliance is one, which is designed in a way that does not require a safety connection into the earth (ground). 

(a) Class 0.

(b) Class 1. 

(c) Class 2. 

(d) Class 3. 

Ans: (c) Class 2.

6. ______________ appliance is designed to be supplied from a separated or safety extra-low voltage power source. 

(a) Class 0. 

(b) Class 1.

(c) Class 2. 

(d) Class 3. 

Ans: (d) Class 3.

7. Which of the following dimensions is used for copper plate in plate earthing? 

(a) 600 × 600 × 12mm. 

(b) 600 × 600 × 6mm.

(c) 600 × 600 × 3.5mm. 

(d) 600 × 600 × 15mm. 

Ans: (c) 600 × 600 × 3.5mm.

8. Which of the following dimensions is used for galvanised iron plate in plate earthing? 

(a) 600 × 600 × 12mm. 

(b) 600 × 600 × 6mm.

(c) 600 × 600 × 3.5mm. 

(d) 600 × 600 × 15mm. 

Ans: (b) 600 × 600 × 6mm.

9. Which of the following dimensions is used for cast iron plate in plate earthing? 

(a) 600 × 600 × 6mm. 

(b) 600 × 600 × 12mm. 

(c) 600 × 600 × 3.5mm.

(d) 600 × 600 × 15mm. 

Ans: (b) 600 × 600 × 12mm.

10. What will be the impact on the conductivity of water if it gets purified? 

(a) Conductivity of water will increase. 

(b) Conductivity of water will decrease. 

(c) Conductivity of water will remain the same.

(d) Conductivity of water does not depend on purity.

Ans: (b) Conductivity of water will decrease. 

B. Fill in the blanks:

1. Electricity always follows the least ______________ path. 

Ans: Resistance.

2. Bimetallic strip is a part of _________________. 

Ans: Miniature Circuit Breaker.

3. A miniature circuit breaker has two states, i.e., open and _________________. 

Ans: Close.

4. Pure water is bad _______________ of electricity. 

Ans: Conductor.

5. ESD stands for __________________. 

Ans: Electrostatic Discharge.

6. Electrical safety at workplace reduces _______________. 

Ans: Hazards.

7. Class 0 safety is used only in _____________ area. 

Ans: Dry.

8. One must follow the safety _____________ and tags on the control panel.

Ans: Stickers.

9. Current of 40–75 mA will cause _____________. 

Ans: Respiratory paralysis.

10. Heating problem can be eliminated by using the _______________ of wire.

Ans: Appropriate gauge.

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

1. A wireman should always follow the correct wiring diagram.

Ans: True.

2. A wireman must follow the safety signs, stickers and tags on the control panel. 

Ans: True.

3. It is not necessary to read labels and instructions given on the components. 

Ans: False.

4. A wireman wears appropriate clothing and removes all metal objects before working. 

Ans: True.

5. One must use only the prescribed protective safety equipment. 

Ans: True.

6. Always follow the safety rules when working with electrical machinery or equipment. 

Ans: True.

7. Electrostatic discharge can cause damage to the electronic devices and components.

Ans: True.

8. When removing a fuse, use only one hand. 

Ans: True.

9. After shutting off a line, always put danger signboards in panels before starting a work. 

Ans: True.

10. Distilled water is a good conductor of electricity.

Ans: False.

D. Short answer questions:

1. What can be the causes of electrostatic discharge?

Ans: Causes of ESD:

(i) Faulty grounding.

(ii) Movement of charges takes place between the connecting points or printed circuit board.

(iii) Human negligence.

2. What is electrocution?

Ans: Electrocution is death or severe injury by electric shock.

3. List the tools required for carrying out electrical work.

Ans: The tools required for carrying out electrical work are:

(i) Pliers.

(ii) Screwdrivers.

(iii) Wire strippers.

(iv) Testers.

(v) Hammers.

(vi) Hand drills.

(vii) Hacksaw.

(viii) Soldering iron.

(ix)  Spanners.

(x) Files.

4. What will be the hand position of a wireman while working with a fuse panel?

Ans: While working with fuse panel, the wireman must keep one hand in pocket and use the other hand to work.

5. What testing can be performed for confirming that power of a device is off?

Ans: Before starting work on any electrical installation, ensure that it is disconnected from the power supply. Use a tester to confirm that the power is off.

6. Which ladders are used at workplace?

Ans: Wooden or fibre ladders should be used for working at heights, especially while performing electrical work, as they are non-conductive and provide better safety against electric shocks.

7. What are the general guidelines that a wireman needs to follow at the workplace?

Ans: Some of the general guidelines that a wireman needs to follow at workplace are as follows:

(i) Always follow the correct procedures to ensure zero accidents at work.

(ii) Always follow the correct wiring diagram. Obey the safety signs, stickers and tags on the control panel. 

(iii) Always uses appropriate tools for carrying out a work. Never leave a running panel unattended. 

(iv) Always read the labels and instructions given on the components. 

(v) Always wear appropriate clothing and remove metal objects before starting a work. Use prescribed protective safety equipment only. 

(vi) Always follow electrical safety rules when working with electrical machinery or equipment. 

(vii)  Report all unsafe acts or conditions to the supervisor.