Question 1 of 17

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

Spreads heat uniformly

Draws cooling air inside

Exhausts hot air outside

Revolves and reflects electromagnetic energy

Question 1 of 17

Question 2 of 17

2. What is the magnetron tube filament voltage used in microwave ovens?

2.0 V AC

3.2 V AC

3.0 V AC

1.5 V AC

Question 2 of 17

Question 3 of 17

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

Heat = IR²T/J cal

Heat = I²RT/J cal

Heat = (IR)²T/J cal

Heat = IRT/J cal

Question 3 of 17

Question 4 of 17

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

Pressure plate

Sole plate

Asbestos sheet

Mica insulation

Question 4 of 17

Question 5 of 17

5. What is this circuit called?

Electronic fan regulator

Electronic voltage multiplier

Electronic voltage stabilizer

Electronic triggering circuit of SCR

Question 5 of 17

Question 6 of 17

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

71.6 kcal

71.0 kcal

70.5 kcal

72.1 kcal

Question 6 of 17

Question 7 of 17

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

Short in starting winding

Open starting winding

Defective capacitor

Short in running winding

Question 7 of 17

Question 8 of 17

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

Maintains load current constant

Maintains voltage level constant

Reduces voltage drop in wiring

Provides current return path

Question 8 of 17

Question 9 of 17

9. Which motor type is used in wet grinders?

Capacitor start capacitor run motor

Universal motor

Capacitor start induction run motor

Repulsion motor

Question 9 of 17

Question 10 of 17

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

Radiate heat properly

Retain heating element firmly

Protect element from damage

Place vessels firmly

Question 10 of 17

Question 11 of 17

11. Which position gives maximum output from a heater?

Position 3

Position 2

Position 4

Position 1

Question 11 of 17

Question 12 of 17

12. 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 formation

Question 12 of 17

Question 13 of 17

13. Which material is used to make heating elements?

Nichrome

Aluminium

Copper

Silver

Question 13 of 17

Question 14 of 17

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

Amplifies microwave signal

Oscillates to produce cooking frequency

Changes polarity every half cycle

Converts microwave to electrical energy

Question 14 of 17

Question 15 of 17

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

Universal motor

Split phase motor

Repulsion motor

Shaded pole motor

Question 15 of 17

Question 16 of 17

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

Defective commutator

Worn out brushes

Field winding partially short

Armature coil open

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

Protects the kettle base from damage

Acts as an insulator for the element

Question 17 of 17