Question 1 of 17

1. What is this circuit called?

Electronic voltage multiplier

Electronic fan regulator

Electronic voltage stabilizer

Electronic triggering circuit of SCR

Question 1 of 17

Question 2 of 17

2. Which position gives maximum output from a heater?

Position 3

Position 2

Position 1

Position 4

Question 2 of 17

Question 3 of 17

3. 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 3 of 17

Question 4 of 17

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

Shaded pole motor

Split phase motor

Universal motor

Repulsion motor

Question 4 of 17

Question 5 of 17

5. Which material is used to make heating elements?

Copper

Silver

Nichrome

Aluminium

Question 5 of 17

Question 6 of 17

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

Reduces voltage drop in wiring

Maintains load current constant

Provides current return path

Maintains voltage level constant

Question 6 of 17

Question 7 of 17

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

Mica insulation

Sole plate

Asbestos sheet

Pressure plate

Question 7 of 17

Question 8 of 17

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

Armature coil open

Worn out brushes

Defective commutator

Field winding partially short

Question 8 of 17

Question 9 of 17

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

Open starting winding

Short in starting winding

Short in running winding

Defective capacitor

Question 9 of 17

Question 10 of 17

10. Which motor type is used in wet grinders?

Universal motor

Repulsion motor

Capacitor start capacitor run motor

Capacitor start induction run motor

Question 10 of 17

Question 11 of 17

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

Acts as an insulator for the element

Acts as a balancing weight

Keeps the element in close contact with container

Protects the kettle base from damage

Question 11 of 17

Question 12 of 17

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

71.6 kcal

72.1 kcal

71.0 kcal

70.5 kcal

Question 12 of 17

Question 13 of 17

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

Prevents draining of water

Avoids scale formation

Reduces outlet pipe pressure

Prevents air locking in tank

Question 13 of 17

Question 14 of 17

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

Exhausts hot air outside

Spreads heat uniformly

Draws cooling air inside

Revolves and reflects electromagnetic energy

Question 14 of 17

Question 15 of 17

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

Protect element from damage

Radiate heat properly

Retain heating element firmly

Place vessels firmly

Question 15 of 17

Question 16 of 17

16. 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 16 of 17

Question 17 of 17

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

Heat = I²RT/J cal

Heat = IR²T/J cal

Heat = IRT/J cal

Heat = (IR)²T/J cal

Question 17 of 17