Question 1 of 17

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

1.5 V AC

3.2 V AC

2.0 V AC

3.0 V AC

Question 1 of 17

Question 2 of 17

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

70.5 kcal

71.6 kcal

72.1 kcal

71.0 kcal

Question 2 of 17

Question 3 of 17

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

Place vessels firmly

Radiate heat properly

Retain heating element firmly

Protect element from damage

Question 3 of 17

Question 4 of 17

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

Heat = (IR)²T/J cal

Heat = IR²T/J cal

Heat = IRT/J cal

Heat = I²RT/J cal

Question 4 of 17

Question 5 of 17

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

Short in running winding

Short in starting winding

Defective capacitor

Open starting winding

Question 5 of 17

Question 6 of 17

6. Which position gives maximum output from a heater?

Position 4

Position 1

Position 2

Position 3

Question 6 of 17

Question 7 of 17

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

Acts as a balancing weight

Acts as an insulator for the element

Protects the kettle base from damage

Keeps the element in close contact with container

Question 7 of 17

Question 8 of 17

8. Which material is used to make heating elements?

Silver

Copper

Nichrome

Aluminium

Question 8 of 17

Question 9 of 17

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

Avoids scale formation

Reduces outlet pipe pressure

Prevents air locking in tank

Prevents draining of water

Question 9 of 17

Question 10 of 17

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

Worn out brushes

Defective commutator

Armature coil open

Field winding partially short

Question 10 of 17

Question 11 of 17

11. 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 11 of 17

Question 12 of 17

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

Draws cooling air inside

Exhausts hot air outside

Spreads heat uniformly

Revolves and reflects electromagnetic energy

Question 12 of 17

Question 13 of 17

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

Reduces voltage drop in wiring

Maintains load current constant

Maintains voltage level constant

Provides current return path

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. What is this circuit called?

Electronic voltage multiplier

Electronic triggering circuit of SCR

Electronic fan regulator

Electronic voltage stabilizer

Question 15 of 17

Question 16 of 17

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

Split phase motor

Shaded pole motor

Universal motor

Repulsion motor

Question 16 of 17

Question 17 of 17

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

Pressure plate

Mica insulation

Sole plate

Asbestos sheet

Question 17 of 17