CBSE Class-12 Exam 2020 : Question Paper (Electrical Appliances)

• Subject :-Electrical Appliances
• Class : XII
• Year : 2020

SECTION A

PART I

Answer any ten questions : 1x10=10

1. Fault in electric iron may be 1
(A) Earth fault only
(B) Short circuit fault only
(C) Open circuit fault only
(D) All of the above faults

2. Which of the following is generally used in a hot plate ? 1
(A) Rotary switch
(B) Timer
(C) Thermostat
(D) None of the above

3. Nichrome strip wound over a triangular mica plate type heating element is used in 1
(A) Automatic electric kettle
(B) Ordinary electric kettle
(C) Both (A) and (B)
(D) None of the above

4. Exhaust fan is used in 1
(A) A washroom
(B) A desert cooler
(C) A room cooler
(D) Both (A) and (B)

5. Processes like Soak, Wash, Rinse and Spin can be performed by 1
(A) Ordinary washing machine
(B) Semi-automatic washing machine
(C) Fully automatic washing machine
(D) None of the above

6. Thermostat control is used in 1
(A) Ordinary washing machine
(B) Automatic washing machine
(C) Both (A) and (B)
(D) None of the above

7. The motor generally used in domestic electric washing machine is 1
(A) Capacitor start capacitor run motor
(B) Reluctance motor
(C) Split-Phase motor
(D) None of the above

8. Defect in curler may be due to 1
(A) Defect in motor
(B) Defect in heating element
(C) Defect in cord
(D) Both (B) and (C)

9. The starting winding of a single-phase induction motor is placed in a 1
(A) Rotor
(B) Stator
(C) Field
(D) None of the above

10. Defect in motor may be due to 1
(A) Open circuit in the winding
(B) Worn bearing
(C) Locking at air gap
(D) All of the above

11. Universal motor is generally used in 1
(A) Clothes washing machine
(B) Exhaust fan
(C) Both (A) and (B)
(D) None of the above

12. When electric equipments are lifted manually, the person should have 1
(A) Firm footing
(B) Straight back
(C) Chin inward
(D) All of the above 

PART II

Answer any five questions. 2x5=10

13. Describe in brief the functions of an O.T.G. 2
14. Describe in brief the construction of a geyser. 2
15. Describe the procedure involved in the repair of a defective heat convector. 2
16. Describe the testing and repairing procedure of a defective blender. 2
17. Describe the installation procedure of a desert cooler. 2
18. Describe the common faults and their causes in a vacuum cleaner. 2
19. Give a brief description of the equipment required to handle heavy electrical machines. 2

PART III

Answer any five questions. 3x5=15

20. What defects can be found in a bowl type room heater, and how can they be removed ? 3
21. Describe the procedure of testing and repairing of a defective hot plate. 3
22. Describe the common defects and their causes in an ordinary electric toaster. 3
23. Explain the construction and working of an ordinary electric washing machine. 3
24. Draw the circuit diagram of a manual voltage stabiliser and briefly describe its working. 3
25. Which type of motor is used in a small electric drill machine ? Describe its special features. 3
26. What precautions are to be taken to avoid an electric shock ? Explain. 3

SECTION B

Answer any one question. 5x1=5

27. Explain the defects in a blower type room heater, and how they can be removed. 5
28. Describe in detail the construction of a pedestal fan and the motor used
in it, and also give its uses. 

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Courtesy: CBSE