Objective Questions on Domestic Appliances for Electrician Trade
| Sr. No. | Questions with options |
| 1 | Which material is used to make heating element?
(a) Silver (b) Copper (c) Nichrome (d) Aluminium Ans – (c) |
| 2 | What is the function of stirrer motor in micro wave oven?
(a) Draws cooling air inside (b) Spreads the heat uniformly (c) Exhausts the hot air outside (d) Revolves and reflects the electromagnetic Ans- (d) |
| 3 | Which type of A.C single phase motor is used in food mixer?
(a) Universal motor (b) Repulsion motor (c) Split phase motor (d) Shaded pole motor Ans –(a) |
| 4 | Which formula is used to calculate the heat generated as per joules law?
(a) Heat generated = IRT/ J cal (b) Heat generated = I2RT/ J cal (c) Heat generated = IR2T/J cal (d) Heat generated = (IR)2T/J cal Ans –(b) |
| 5 | Calculate the heat generated in a electric heater of 1000 watt, 240 volt, worked for 5 minutes?
(a) 70.5 kilo calories (b) 71.0 kilocalories (c) 71.6 kilo calories (d) 72.1 kilo calories Ans – (c) |
| 6 | What is the purpose of protection grooves at various places in a hater base plate?
(a) Radiate the heat properly (b) Retain the heating element firmly (c) Place the vessels firmly on heater plate (d) Protect the heating element from damage Ans –(b) |
| 7 | What is the purpose of the sole plate in electric kettle?
(a) Acts as a balancing weight (b) Acts as an insulator for element (c) Protect the kettle base from damage (d) Keep the element in close contact with container Ans – (d) |
| 8 | What is the magnetron tube filament voltage used in microwave oven?
(a) 1.5 VAC (b) 2.0 VAC (c) 3.0 VAC (d) 3.2 VAC Ans – (d) |
| 9 | What is the fault in a food mixer if it runs intermittently?
(a) Worn out brushes (b) Armature e coil open (c) Defective commutator (d) Field winding partially short Ans – (a) |
| 10 | What is the defect in a single phase pump motor if it runs with slow speed?
(a) Defective capacitor (b) Open starting winding (c) Short in starting winding (d) Short in running winding Ans – (a) |
| 11 | What is the function of neutral path in AC supply system for appliances?
(a) Provides current return path (b) Provides voltage level constant (c) Reduces voltage drop in wiring (d) Maintains load current constant Ans –(a) |
| 12 | What is the function of magnetron tube in microwave oven?
(a) Amplifies the microwave signal (b) Changes the polarity every half cycle (c) Oscillate and produce cooking frequency (d) Converts microwave energy to electrical energy Ans – (c) |
| 13 | Which type of motor is used in the wet grinder?
(a) Universal motor (b) Repulsion motor (c) Capacitor start induction run motor (d) Capacitor start capacitor run motor Ans –(c) |
| Published On – 2nd June 2022 | |
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