# LET: TLE Part 30

This is the Multiples Choice Questions Part 30 of TLE. In preparation for the LET Exam, practice, and familiarize every question we have, it might be included in the actual examination. Good luck.

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### TLE Part 30

1. What type of switch is used to control alternatively three-phase line system using two sources of power?

a. Double Pole Single Throw Switch

b. Single Pole Double Throw Switch

c. Triple Pole Single Throw Switch

d. Triple Pole Double Throw Switch

2. Which of the following is the best conductor of electricity?

a. Copper

b. Aluminum

c. Silver

d. Gold

3. What type of switch is used when you want to control one lamp or group of lamps in two different locations?

a. Two, 3-way switch

b. One, 4-way switch

c. Two, single switch

d. Duplex switch

4. Cells are connected in parallel to increase the ______ capacity of the cells.

a. Current

b. Voltage

c. Resistance

d. Inductance

5. The resistors are to be connected in four possible types of circuit connections namely series, parallel, series-parallel and parallel-series. Which type of connection will give the least amount of equivalent resistance?

a. Series

b. Parallel

c. Series-parallel

d. Parallel-series

6. Which is an exposed wiring method that uses cleats, knobs, tubes and flexible tubing for the protection and support of single insulated conductor run in or on building and not concealed by the building structure?

a. Open wiring on insulators

b. Armored cable wiring

c. Concealed knob and tube wiring

d. Metal clad cable wiring

7. What will happen if two 100-W, 230 V incandescent lamps are connected in series across a 230 V source?

a. Both lamps will consume more power.

b. Both lamps will get burnt.

c. Each lamp will give lesser output lights.

d. Each lamp will give more output lights.

8. What is the mean reason why electrical appliances are connected in parallel rather than in series?

a. Parallel connection consumes lesser power.

b. Parallel connection is simpler than series connection.

c. Each appliance consumes more power if connected in series.

d. It makes the operation of each appliance independent of each other.

9. When replacing a busted fuse which of the following is important?

a. Same size and type

b. Same type but different rating

c. Same size but different rating

d. Different size and type

10. Which of the following is a source of alternating current?

a. Dynamo

b. Battery

c. Dry cell

d. Alternator

11. When there is a break in the circuit and the current could not pass through, the circuit is _____.

a. closed

b. shorted

c. grounded

d. open

12. Which term usually refers to a device that produces an electric current when light falls upon them?

a. Solar cell

b. Dry cell

c. Solar lamp

d. Solar light

13. Which is a synchronous alternating-current machine that changes mechanical power into electrical power?

a. Dynamo

b. Motor

c. Alternator

d. Lathe machine

14. Which battery CANNOT be recharged after its chemical energy has been depleted?

a. Energizer

c. Primary battery

d. Secondary battery

15. Which generator generates direct current?

a. Alternator

b. Dynamo

c. Battery

16. Which battery can be recharged after each chemical energy has been depleted

a. Primary battery

b. Energizer

d. Secondary battery

17. Which is used to change mechanical energy into electrical energy?

a. Battery

b. Circuit

c. Dry cell

d. Generator

18. A process in splitting the atom of uranium is called _____.

a. fusion

b. fission

c. friction

d. tension

19. A process in joining hydrogen atoms which causes heat hotter than the sun is called _____.

a. fusion

b. fission

c. friction

d. tension

20. Which transforms heat energy to electric energy?

a. Transformer

b. Battery

c. Generator

d. Thermocouple

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