Question 1 of 17

1. Which material is used to make heating elements?

Copper

Nichrome

Silver

Aluminium

Question 1 of 17

Question 2 of 17

2. 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 2 of 17

Question 3 of 17

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

Revolves and reflects electromagnetic energy

Spreads heat uniformly

Exhausts hot air outside

Draws cooling air inside

Question 3 of 17

Question 4 of 17

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

Sole plate

Mica insulation

Asbestos sheet

Pressure plate

Question 4 of 17

Question 5 of 17

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

Universal motor

Repulsion motor

Split phase motor

Shaded pole motor

Question 5 of 17

Question 6 of 17

6. Which position gives maximum output from a heater?

Position 1

Position 4

Position 3

Position 2

Question 6 of 17

Question 7 of 17

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

2.0 V AC

3.2 V AC

3.0 V AC

1.5 V AC

Question 7 of 17

Question 8 of 17

8. What is this circuit called?

Electronic voltage multiplier

Electronic voltage stabilizer

Electronic triggering circuit of SCR

Electronic fan regulator

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

Prevents draining of water

Reduces outlet pipe pressure

Prevents air locking in tank

Question 9 of 17

Question 10 of 17

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

Defective commutator

Armature coil open

Worn out brushes

Field winding partially short

Question 10 of 17

Question 11 of 17

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

Maintains voltage level constant

Provides current return path

Maintains load current constant

Reduces voltage drop in wiring

Question 11 of 17

Question 12 of 17

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

Heat = IRT/J cal

Heat = IR²T/J cal

Heat = (IR)²T/J cal

Heat = I²RT/J cal

Question 12 of 17

Question 13 of 17

13. 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 a balancing weight

Acts as an insulator for the element

Question 13 of 17

Question 14 of 17

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

Converts microwave to electrical energy

Changes polarity every half cycle

Oscillates to produce cooking frequency

Amplifies microwave signal

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

70.5 kcal

71.0 kcal

Question 15 of 17

Question 16 of 17

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

Radiate heat properly

Retain heating element firmly

Protect element from damage

Place vessels firmly

Question 16 of 17

Question 17 of 17

17. Which motor type is used in wet grinders?

Capacitor start capacitor run motor

Repulsion motor

Universal motor

Capacitor start induction run motor

Question 17 of 17