Question 1 of 17

1. What is this circuit called?

Electronic voltage stabilizer

Electronic triggering circuit of SCR

Electronic fan regulator

Electronic voltage multiplier

Question 1 of 17

Question 2 of 17

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

Heat = I²RT/J cal

Heat = (IR)²T/J cal

Heat = IR²T/J cal

Heat = IRT/J cal

Question 2 of 17

Question 3 of 17

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

1.5 V AC

2.0 V AC

3.2 V AC

3.0 V AC

Question 3 of 17

Question 4 of 17

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

Mica insulation

Asbestos sheet

Pressure plate

Sole plate

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 starting winding

Open starting winding

Short in running winding

Defective capacitor

Question 5 of 17

Question 6 of 17

6. 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 6 of 17

Question 7 of 17

7. Which position gives maximum output from a heater?

Position 2

Position 3

Position 4

Position 1

Question 7 of 17

Question 8 of 17

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

Repulsion motor

Shaded pole motor

Universal motor

Split phase motor

Question 8 of 17

Question 9 of 17

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

71.6 kcal

70.5 kcal

72.1 kcal

71.0 kcal

Question 9 of 17

Question 10 of 17

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

Protect element from damage

Retain heating element firmly

Radiate heat properly

Place vessels 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

Reduces outlet pipe pressure

Avoids scale formation

Question 11 of 17

Question 12 of 17

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

Armature coil open

Worn out brushes

Field winding partially short

Defective commutator

Question 12 of 17

Question 13 of 17

13. Which motor type is used in wet grinders?

Capacitor start induction run motor

Capacitor start capacitor run motor

Universal motor

Repulsion motor

Question 13 of 17

Question 14 of 17

14. Which material is used to make heating elements?

Copper

Aluminium

Nichrome

Silver

Question 14 of 17

Question 15 of 17

15. 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

Acts as an insulator for the element

Protects the kettle base from damage

Question 15 of 17

Question 16 of 17

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

Provides current return path

Maintains voltage level constant

Reduces voltage drop in wiring

Maintains load current constant

Question 16 of 17

Question 17 of 17

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

Spreads heat uniformly

Draws cooling air inside

Revolves and reflects electromagnetic energy

Exhausts hot air outside

Question 17 of 17