Domestic Appliances

⭕️ Show all Answers

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Q1: Which material is used to make heating element?

• Silver
• Copper
• Nichrome
• Aluminium

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Q2: What is the name of the part of electric iron?

• Sole plate
• Pressure plate
• Mica insulation
• Asbestos sheet

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Q3: What is the function of stirrer motor in micro wave oven?

• Draws cooling air inside
• Spreads the heat uniformly
• Exhausts the hot air outside
• Revolves and reflects the electromagnetic energy

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Q4: What is the purpose of U bend marked as 'X' in geyser?

• Prevents draining of water
• Avoids the forming of scales
• Reduces the pressure of outlet pipe
• Restricts the air locking inside the tank

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Q5: Which type of A.C single phase motor is used in food mixer?

• Universal motor
• Repulsion motor
• Split phase motor
• Shaded pole motor

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Q6: Which is the position for maximum output of the heater?

• Position 1
• Position 2
• Position 3
• Position 4

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Q7: Which formula is used to calculate the heat generated as per Joules law?

• Heat generated = IRT/J cal
• Heat generated = I²RT/J cal
• Heat generated = IR²T/J cal
• Heat generated => (IR)²T/J cal

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Q8: Calculate the heat generated in a electric heater of 1000 watt, 240 volt, worked for 5 minutes.

• 70.5 Kilo calories
• 71.0 Kilo calories
• 71.6 Kilo calories
• 72.1 Kilo calories

Show Calculation

\(P = 1000 \, \text{W}\) \(t = 5 \, \text{minutes} = 5 \times 60 = 300 \, \text{seconds}\) \(1 \, \text{kcal} = 4184 \, \text{J}\) \[ Q = P \times t = 1000 \times 300 = 300{,}000 \, \text{J} \] \[ Q = \frac{300{,}000}{4184} \approx 71.7 \, \text{kcal} \] \[ \boxed{71.7 \, \text{kcal}} \]

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Q9: What is the purpose of protection grooves at various places in a heater base plate?

• Radiate the heat properly
• Retain the heating element firmly
• Place the vessels firmly on heater plate
• Protect the heating element from damage

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Q10: What is the purpose of sole plate in electric kettle?

• Acts as a balancing weight
• Acts as an insulator for element
• Protect the kettle base from damage
• Keep the element in close contact with container

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Q11: What is the magnetron tube filament voltage used in microwave oven?

• 1.5 VA.C
• 2.0 V A.C
• 3.0 V A.C
• 3.2 VA.C

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Q12: What is the fault in a food mixer if it runs intermittently?

• Worn out brushes
• Armature coil open
• Defective commutator
• Field winding partially short

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Q13: What is the defect in a single phase pump motor if it runs with slow speed?

• Defective capacitor
• Open starting winding
• Short in starting winding
• Short in running winding

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Q14: What is the function of neutral path in AC supply system for appliances?

• Provides current. return path.
• Provides voltage level constant
• Reduces voltage drop in wiring
• Maintains load current constant

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Q15: What is the function of magnetron tube in a microwave oven?

• Amplifies the microwave signal
• Changes the polarity every half cycle
• Oscillate and produce cooking frequency
• Converts microwave energy to electrical energy

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Q16: Which type of motor is used in the wet grinder?

• Universal motor
• Repulsion motor
• Capacitor start induction run motor
• Capacitor start capacitor run motor

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Q17: What is the name of the circuit?

• Electronic fan regulator
• Electronic voltage multiplier
• Electronic voltage stabilizer
• Electronic triggering circuit of SCR

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