Question 1 of 17

1. What is the name of this part of an electric iron?

Pressure plate

Asbestos sheet

Sole plate

Mica insulation

Question 1 of 17

Question 2 of 17

2. What is the function of the neutral path in AC supply systems for appliances?

Reduces voltage drop in wiring

Provides current return path

Maintains load current constant

Maintains voltage level constant

Question 2 of 17

Question 3 of 17

3. Which formula calculates heat generated according to Joule's law?

Heat = IR²T/J cal

Heat = IRT/J cal

Heat = I²RT/J cal

Heat = (IR)²T/J cal

Question 3 of 17

Question 4 of 17

4. What is the purpose of the U-bend marked 'X' in a geyser?

Prevents air locking in tank

Avoids scale formation

Prevents draining of water

Reduces outlet pipe pressure

Question 4 of 17

Question 5 of 17

5. 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 AC

Question 5 of 17

Question 6 of 17

6. What is the purpose of protection grooves in a heater base plate?

Radiate heat properly

Retain heating element firmly

Place vessels firmly

Protect element from damage

Question 6 of 17

Question 7 of 17

7. Calculate heat generated by a 1000W, 240V heater working for 5 minutes:

71.6 kcal

71.0 kcal

72.1 kcal

70.5 kcal

Question 7 of 17

Question 8 of 17

8. What is this circuit called?

Electronic voltage stabilizer

Electronic fan regulator

Electronic voltage multiplier

Electronic triggering circuit of SCR

Question 8 of 17

Question 9 of 17

9. Which motor type is used in wet grinders?

Repulsion motor

Capacitor start induction run motor

Capacitor start capacitor run motor

Universal motor

Question 9 of 17

Question 10 of 17

10. What is the fault if a food mixer runs intermittently?

Worn out brushes

Defective commutator

Field winding partially short

Armature coil open

Question 10 of 17

Question 11 of 17

11. What is the function of the magnetron tube in a microwave oven?

Amplifies microwave signal

Oscillates to produce cooking frequency

Converts microwave to electrical energy

Changes polarity every half cycle

Question 11 of 17

Question 12 of 17

12. Which material is used to make heating elements?

Nichrome

Aluminium

Silver

Copper

Question 12 of 17

Question 13 of 17

13. What is the defect in a single-phase pump motor if it runs at slow speed?

Short in running winding

Open starting winding

Defective capacitor

Short in starting winding

Question 13 of 17

Question 14 of 17

14. Which AC single-phase motor is used in food mixers?

Split phase motor

Universal motor

Shaded pole motor

Repulsion motor

Question 14 of 17

Question 15 of 17

15. What is the function of the stirrer motor in a microwave oven?

Revolves and reflects electromagnetic energy

Draws cooling air inside

Spreads heat uniformly

Exhausts hot air outside

Question 15 of 17

Question 16 of 17

16. Which position gives maximum output from a heater?

Position 1

Position 3

Position 2

Position 4

Question 16 of 17

Question 17 of 17

17. What is the purpose of the sole plate in an electric kettle?

Acts as a balancing weight

Keeps the element in close contact with container

Acts as an insulator for the element

Protects the kettle base from damage

Question 17 of 17