Question 1 of 17

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

Keeps the element in close contact with container

Acts as a balancing weight

Protects the kettle base from damage

Acts as an insulator for the element

Question 1 of 17

Question 2 of 17

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

Amplifies microwave signal

Changes polarity every half cycle

Converts microwave to electrical energy

Oscillates to produce cooking frequency

Question 2 of 17

Question 3 of 17

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

Reduces voltage drop in wiring

Maintains voltage level constant

Provides current return path

Maintains load current constant

Question 3 of 17

Question 4 of 17

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

Draws cooling air inside

Revolves and reflects electromagnetic energy

Spreads heat uniformly

Exhausts hot air outside

Question 4 of 17

Question 5 of 17

5. Which motor type is used in wet grinders?

Universal motor

Capacitor start induction run motor

Repulsion motor

Capacitor start capacitor run motor

Question 5 of 17

Question 6 of 17

6. Which material is used to make heating elements?

Copper

Aluminium

Nichrome

Silver

Question 6 of 17

Question 7 of 17

7. 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 7 of 17

Question 8 of 17

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

Sole plate

Mica insulation

Asbestos sheet

Pressure plate

Question 8 of 17

Question 9 of 17

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

Field winding partially short

Armature coil open

Defective commutator

Worn out brushes

Question 9 of 17

Question 10 of 17

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

Radiate heat properly

Place vessels firmly

Protect element from damage

Retain heating element firmly

Question 10 of 17

Question 11 of 17

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

Prevents draining of water

Prevents air locking in tank

Avoids scale formation

Reduces outlet pipe pressure

Question 11 of 17

Question 12 of 17

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

3.2 V AC

1.5 V AC

3.0 V AC

2.0 V AC

Question 12 of 17

Question 13 of 17

13. Which position gives maximum output from a heater?

Position 4

Position 1

Position 3

Position 2

Question 13 of 17

Question 14 of 17

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

Defective capacitor

Short in running winding

Short in starting winding

Open starting winding

Question 14 of 17

Question 15 of 17

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

70.5 kcal

72.1 kcal

71.6 kcal

71.0 kcal

Question 15 of 17

Question 16 of 17

16. What is this circuit called?

Electronic triggering circuit of SCR

Electronic voltage stabilizer

Electronic fan regulator

Electronic voltage multiplier

Question 16 of 17

Question 17 of 17

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

Split phase motor

Shaded pole motor

Repulsion motor

Universal motor

Question 17 of 17