NBSE Class 12 Question Paper 2022 Electronics & Hardware (Vocational)

Total number of printed pages : 2 NB-XII/E&H(V)/1 2022 Electronics & Hardware (Vocational) Total marks : 50 Time : 2 hours General instructions : i) Approximately 15 minutes is allotted to read the question paper and revise the answers. ii) All questions are compulsory except Q. nos.18 to 23 where general option is given. iii) The question paper consists of 23 questions. iv) Marks allocated to every question are indicated against it. N.B: Check to ensure that all pages of the question paper are complete as indicated on the top left side. 1. Choose the correct answer from the given alternatives: 10x1=10 i. Electricity is generated at power plants and moves through a complex system known as (a) transformer (b) motor (c) grid (d) starter ii. Which of the following is not a stage of active listening? (a) receiving (b) understanding (c) non-responding (d) evaluating iii. Individuals who love interacting with people and are generally talkative are considered as (a) extroverts (b) introverts (c) self conscious (d) agreeable iv. A company that is in its first stage of its operation is known as (a) developer (b) start ups (c) manufacturer (d) investors v. During short circuit, MCB is designed to operate at less than (a) 1.5 seconds (b) 2.5 seconds (c) 1.5 milliseconds (d) 2.5 milliseconds vi. In power plug connections, black wire indicates (a) phase (b) neutral (c) earth (d) positive vii. A device that opens or closes the contacts to cause the operation of the other electric control is known as (a) relay (b) contactor (c) energy meter (d) coil viii. What is the minimum distance to maintain from overheadlines? (a) 10 ft (b) 20 ft (c) 30 ft (d) 40 ft ix. Which is the short cut key to underline text in a spreadsheet? (a) ctrl+b (b) ctrl+i (c) ctrl+l (d) ctrl+u

-2- NB-XII/E&H(V)/1 x. Banana leaf and paper plates which are easily disposable, are an example of (a) reusing scrap material (b) eco friendly material (c) ensuring quality control (d) waste management Answer the following questions in one word or one sentence: 2. Write any two benefits of green jobs. 1 3. What is a starter? 1 4. What is a panel board? 1 5. List any two types of switchboards. 1 6. What is the working principle of relay? 1 7. Name the device that is used to cut off power in an emergency. 1 8. Why is feedback important in communication? 1 9. State any one way to manage stress. 1 Answer the following questions in 20-50 words: 10. List any two advantages of AC generators. 2 11. What is the main function of miniature circuit breakers (MCB)? 2 12. Draw the power point wiring diagram. 2 13. Give any two applications of potential transformer. 2 14. List any two main hazards of working with electricity. 2 15. State the role of switchgear. 2 16. Write the basic operation of contactor. 2 17. Mention any two advantages of presentation software. 2 Answer any four from the following questions in 60-100 words: 18. Explain the three phase system with the help of a diagram. 2+2=4 19. Explain the working principle of a circuit breaker. 4 20. What is PLC? Explain briefly the two types of PLC. 1+3=4 21. Explain the working of energy meter. 4 22. Explain any two common electrical hazards in the workplace and the tips to mitigate the risks. 2+2=4 23. Draw the wiring diagram of a switchboard and explain it briefly. 2+2=4 ******************************************