CBSE Electrical Appliances Paper – 3 Question Paper Class 12th (2010)

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Series OSS                                                                                                                                 Code No. 104
                                                                          ELECTRICAL APPLIANCES
                                                                                (Theory) Paper III
Time allowed : 3 hours                                                                                                   Maximum marks :40
Instructions :   Attempt all questions.




1. (a) Explain the construction and working of a shaded pole motor.    6
         Explain the procedure of components testing of a universal motor.    6


(b) Give the constructional details of the motor used in a ceiling fan. How will you reverse the direction of rotation of a ceiling fan ?    4


2. (a) Explain the construction and working principle of a mixer. Give its few uses.    5
    (b) Describe in brief the working of a Manual Voltage Stabiliser with its circuit diagram.    5


3. (a) Explain the procedure of overhauling a washing machine.    4
    (b) Explain the installation procedure of a desert cooler. Why is earthing of a desert cooler required ?    4
Describe in detail the procedure involved in the testing of a defective desert cooler.    4


4. (a) Describe in detail the procedure involved in the repair of a blower type room heater.
          Give the constructional details of a bowl type room heater.
   (b). Explain the common faults in a hair dryer. How will you rectify them ?


5. Explain the construction and working principle of a vacuum cleaner.
    Describe the common faults in an electric hand drill. How will, you rectify them ?

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