Class 12 Electronics Chapter 3 Circuit Breaker

Class 12 Electronics Chapter 3 Circuit Breaker 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 12 Electronics Chapter 3 Circuit Breaker Question Answer and select need one. Class 12 Electronics Chapter 3 Circuit Breaker Notes Download PDF. AHSEC Class 12 Elective Electronics Question Answer English Medium.

Class 12 Electronics Chapter 3 Circuit Breaker

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 12 Elective Electronics Textual Solutions are part of All Subject Solutions. Here we have given AHSEC Class 12 Electronics Textbook Solutions English Medium for All Chapters, You can practice these here.

Circuit Breaker

Chapter: 3

Check Your Progress

A. Multiple choice questions:

1. How many metals are used to form a bimetallic strip? 

(a) One metal. 

(b) Two metal.

(c) Three metal. 

(d) Four metal. 

Ans: (b) Two metal.

2. Which of the following is not part of a MCB? 

(a) Processor. 

(b) Copper Braid. 

(c) Arc chute.

(d) Magnetic coil. 

Ans: (a) Processor.

3. Which of the following is not a type of fuse? 

(a) Cartridge type high voltage HRC fuse. 

(b) Liquid types high voltage HRC fuse. 

(c) Expulsion type high voltage fuse. 

(d) Stroke Fuse. 

Ans: (d) Stroke Fuse.

4. Which of the following is not a type of low voltage fuse? 

(a) Rewirable fuse. 

(b) Cartridge fuse. 

(c) Dropout fuse. 

(d) Cartridge type high voltage HRC fuse.

Ans: (d) Cartridge type high voltage HRC fuse.

5. Which of the following is not a high voltage fuse? 

(a) Cartridge type high voltage HRC fuse. 

(b) Expulsion type high voltage fuse. 

(c) Liquid type high voltage fuse. 

(d) Solid type high voltage fuse. 

Ans: (d) Solid type high voltage fuse.

6. The most commonly used fuse in house wiring is _________________. 

(a) Rewirable fuse. 

(b) D-type cartridge fuse.

(c) Dropout fuse. 

(d) Link type cartridge.

Ans: (a) Rewirable fuse. 

7. Which of the following principle is used in the operation of a fuse? 

(a) Heating effect of current.

(b) Electromagnetic induction.

(c) Faraday’s law. 

(d) Magnetic field.

Ans: (a) Heating effect of current.

8. Which of the following material is used to make the casing of a fuse? 

(a) Ceramic. 

(b) Glass. 

(c) Plastic. 

(d) All of the above. 

Ans: (d) All of the above. 

9. Which of the following is/are reason(s) for overcurrent in a system? 

(a) Overload.

(b) Short circuit. 

(c) Ground fault.

(d) All of the above.

Ans: (d) All of the above.

10. Which of the following is the basic classification of a fuse? 

(a) AC.

(b) DC.

(c) AC and DC.

(d) None of the above.

Ans: (c) AC and DC.

B. Fill in the blanks:

1. A bimetallic strip is made up of ___________ and ____________. 

Ans: Steel, brass.

2. In a rewirable fuse the base is made up of ____________. 

Ans: Copper or aluminium.

3. A fuse is also called ______________ device. 

Ans: Electromechanical.

4. A general fuse consists of a ______________ metallic wire enclosed in a non-combustible material. 

Ans: Low resistance.

5. A ______________ fault occurs when electrical current f lows from a conductor to uninsulated metal that is not designed to conduct electricity. 

Ans: Ground.

6. A short circuit occurs when there is a direct but unintended connection between ______________ or ______________ conductors. 

Ans: Line to line or line to neutral.

7. The melting point of copper is __________________ degree Celsius. 

Ans: 1090 

8. In India, the rate of change of AC supply is ______________ cycles per second. 

Ans: 50

9. The standard unit of frequency is ________________. 

Ans: Hertz.

10. The enclosure of the HRC fuse is filled with powdered pure quartz, which acts as _______________ material.

Ans: Heat absorbing.

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

1. Melting point of silver is 980 ˚C. 

Ans: True.

2. Corona in electrical system means “the glow around a conductor at high potential”.

Ans: True.

3. Arc chute extinguishes the arc produced due to heavy current. 

Ans: True.

4. The ON/OFF switch can be manually used by the user. 

Ans: True.

5. A bimetallic strip uses two similar metals bonded together. 

Ans: False.

6. In MCB the live/phase wire is screwed at the input terminal. 

Ans: True.

7. The current from the coil goes to the bimetallic strip by means of another thick wire. 

Ans: True.

8. In cartridge type high voltage HRC fuse the fuse element is wound in the shape of a helix, which avoids the corona effect at higher voltages. 

Ans: True.

9. In high rupturing capacity fuse, the fuse element carries the fault current for a longer duration. 

Ans: True.

10. In dropout fuse the melting of fuse causes the fuse element to drop in the lower support of fuse.

Ans: True.