Question 1 of 17

1. 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 1 of 17

Question 2 of 17

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

Heat = IR²T/J cal

Heat = IRT/J cal

Heat = (IR)²T/J cal

Heat = I²RT/J cal

Question 2 of 17

Question 3 of 17

3. 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 3 of 17

Question 4 of 17

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

Oscillates to produce cooking frequency

Changes polarity every half cycle

Converts microwave to electrical energy

Amplifies microwave signal

Question 4 of 17

Question 5 of 17

5. Which material is used to make heating elements?

Aluminium

Nichrome

Silver

Copper

Question 5 of 17

Question 6 of 17

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

Avoids scale formation

Prevents draining of water

Reduces outlet pipe pressure

Prevents air locking in tank

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

Short in running winding

Open starting winding

Defective capacitor

Question 7 of 17

Question 8 of 17

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

Field winding partially short

Armature coil open

Defective commutator

Worn out brushes

Question 8 of 17

Question 9 of 17

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

Revolves and reflects electromagnetic energy

Draws cooling air inside

Exhausts hot air outside

Spreads heat uniformly

Question 9 of 17

Question 10 of 17

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

Keeps the element in close contact with container

Protects the kettle base from damage

Acts as an insulator for the element

Acts as a balancing weight

Question 10 of 17

Question 11 of 17

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

Universal motor

Repulsion motor

Shaded pole motor

Split phase motor

Question 11 of 17

Question 12 of 17

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

Pressure plate

Sole plate

Asbestos sheet

Mica insulation

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. Which motor type is used in wet grinders?

Capacitor start induction run motor

Capacitor start capacitor run motor

Universal motor

Repulsion motor

Question 14 of 17

Question 15 of 17

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

72.1 kcal

71.6 kcal

71.0 kcal

70.5 kcal

Question 15 of 17

Question 16 of 17

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

Reduces voltage drop in wiring

Provides current return path

Maintains voltage level constant

Maintains load current constant

Question 16 of 17

Question 17 of 17

17. What is this circuit called?

Electronic fan regulator

Electronic voltage stabilizer

Electronic triggering circuit of SCR

Electronic voltage multiplier

Question 17 of 17