30 Jun 2025 ELECTRICIAN 1st YEAR MODULE – Domestic appliances by admin | posted in: nimi online test, NSQF, NSQF LEVEL 4 | 0 0% Question 1 of 17 1. Which position gives maximum output from a heater? Position 2 Position 3 Position 1 Position 4Question 1 of 17Question 2 of 17 2. What is the fault if a food mixer runs intermittently? Armature coil open Field winding partially short Worn out brushes Defective commutatorQuestion 2 of 17Question 3 of 17 3. What is the defect in a single-phase pump motor if it runs at slow speed? Defective capacitor Short in starting winding Open starting winding Short in running windingQuestion 3 of 17Question 4 of 17 4. Calculate heat generated by a 1000W, 240V heater working for 5 minutes: 71.6 kcal 71.0 kcal 72.1 kcal 70.5 kcalQuestion 4 of 17Question 5 of 17 5. What is the function of the stirrer motor in a microwave oven? Draws cooling air inside Spreads heat uniformly Revolves and reflects electromagnetic energy Exhausts hot air outsideQuestion 5 of 17Question 6 of 17 6. What is the purpose of the U-bend marked 'X' in a geyser? Prevents air locking in tank Reduces outlet pipe pressure Prevents draining of water Avoids scale formationQuestion 6 of 17Question 7 of 17 7. What is this circuit called? Electronic voltage multiplier Electronic voltage stabilizer Electronic triggering circuit of SCR Electronic fan regulatorQuestion 7 of 17Question 8 of 17 8. What is the purpose of the sole plate in an electric kettle? Acts as an insulator for the element Acts as a balancing weight Keeps the element in close contact with container Protects the kettle base from damageQuestion 8 of 17Question 9 of 17 9. Which material is used to make heating elements? Silver Nichrome Copper AluminiumQuestion 9 of 17Question 10 of 17 10. Which motor type is used in wet grinders? Universal motor Capacitor start induction run motor Repulsion motor Capacitor start capacitor run motorQuestion 10 of 17Question 11 of 17 11. Which formula calculates heat generated according to Joule's law? Heat = (IR)²T/J cal Heat = IR²T/J cal Heat = I²RT/J cal Heat = IRT/J calQuestion 11 of 17Question 12 of 17 12. What is the function of the neutral path in AC supply systems for appliances? Maintains voltage level constant Reduces voltage drop in wiring Maintains load current constant Provides current return pathQuestion 12 of 17Question 13 of 17 13. What is the magnetron tube filament voltage used in microwave ovens? 2.0 V AC 3.0 V AC 3.2 V AC 1.5 V ACQuestion 13 of 17Question 14 of 17 14. What is the function of the magnetron tube in a microwave oven? Converts microwave to electrical energy Amplifies microwave signal Oscillates to produce cooking frequency Changes polarity every half cycleQuestion 14 of 17Question 15 of 17 15. What is the name of this part of an electric iron? Sole plate Mica insulation Asbestos sheet Pressure plateQuestion 15 of 17Question 16 of 17 16. Which AC single-phase motor is used in food mixers? Repulsion motor Universal motor Shaded pole motor Split phase motorQuestion 16 of 17Question 17 of 17 17. What is the purpose of protection grooves in a heater base plate? Retain heating element firmly Radiate heat properly Place vessels firmly Protect element from damageQuestion 17 of 17 Loading...
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