Electricity Exam

1. What type of switch is used to control alternately 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 main 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 in 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
b. Eveready
c. Primary battery
d. Secondary battery
15. Which generator generates direct current?
a. Alternator
b. Dynamo
c. Battery adaptor
16. Which battery can be recharged after each chemical energy has been depleted
a. Primary battery
b. Energizer
c. Eveready
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
21. Which is the kinetic energy of falling water?
a. Thermos energy
b. Hydro energy
c. Solar energy
d. Mechanical energy
22. Which is a solar collector that I capable of producing voltage when exposed to radiant energy (sunlight)?
a. Photoelectric
b. Photovoltaic system
c. Photoemission system
d. Solar light
23. Energy derived or extracted from the internal heat of the earth is called _____.
a. Voltaic
b. Geothermal
c. Thermal
d. Chemical
24. Which refers to the extracted of electrons from a substance by sunlight on incident electromagnetic radiation?
a. Photoelectric effect
b. Photovoltaic effect
c. Photoemission
d. Electron microscopy
25. Which statement is true?
a. Bigger size of wire has higher resistance
b. Bigger size of wire has lover resistance
c. Long wire has lesser resistance
d. Short wire has higher resistance
26. A small light bulb with a resistance of 1000 ohms is connected across a 120-v line. What is the current through the bulb?
a. 1.2 A
b. 0.012 A
c. 0.12 A
d. 12 A
27. A 200 v lamp has a resistance of 400 ohms. The power rating in watts of lamp is ________.
a. 100w
b. 600w
c. 200w
d. 250w
28. If 18 resistances, each of a value of 36 ohms, are connected in parallel, then the total resistance is ______.
a. 36 ohms
b. 2 ohms
c. 648 ohms
d. 54 ohms
29. A toaster takes 10 A from a 120 v line. The power used is ______.
a. 12w
b. 130w
c. 1200w
d. 120w
30. What is the resistance of a 100w, 110v incandescent lamp?
a. 121 ohms
b. 115 ohms
c. 125 ohms
d. 12.1 ohms
31. How many kilowatts is the water heater if it draws a current of 10 amperes and has a resistance of 23 ohms?
a. 23 Kw
b. 2300 Kw
c. 230 Kw
d. 2.3 Kw
32. The resistance of an electrical wire is inversely proportional to its _____.
a. Length
b. Cross sectional area
c. Temperature
d. Material
33. The minimum size of wire used in electrical wiring is the no. 14 AWG. Under the SI standard, what is the diameter of this
wire?
a. 1.2 mm
b. 1.6 mm
c. 1.5 mm
d. 2.0 mm
34. A thin walled steel raceway of circular form with a corrosion-resistance coating for protection of wires or cables is ____.
a. Rigid metal conduit
b. Flexible metal pipe
c. Metal molding
d. Electrical metallic tubing
35. Armored cable in commercially known as ______.
a. BX cable
b. Flat cable
c. Metallic cable
d. Duplex cable
36. Which terms refers to that switch or outlet boy that is embedded or hidden in the wall?
a. Surface type
b. Flush type
c. Concealed type
d. Open type
37. When the entire switch or outlet body is visible and extends beyond the wall surface, the device is said to be ______.
a. Wall type
b. Surface type
c. Flush type
d. Open type
38. What device automatically breaks the circuit the moment an overload or short circuit occurs?
a. Breaker switch
b. Overload
c. Circuit breaker
d. Main switch
39. Which term is used when two conductors are imbedded in one solid mass of rubber insulation?
a. Two in one
b. Duplex
c. Stranded
d. Double
40. If two identical lamps give normal light when connected in parallel in a 230 v line are reconnected in series in the same line,
the bulb will ______.
a. Give more light
b. Not light
c. Give less light
d. Blows out
41. A short circuit can be detected by using _______.
a. An ohmmeter
b. A megger
c. An oscilloscope
d. An ammeter
ANSWER KEY:
1.D
2. C
3.A
4.A
5.B
6.A
7.C
8.D
9.A
10.D
11.D
12.A
13.C
14.C
15.B
16.D
17.D
18.B
19.A
20.D
21.B
22.B
23.B
24.A
25.B
26.C
27.A
28.B
29.C
30.A
31.D
32.B
33.B
34.D
35.A
36.B
37.B
38.C
39.D
40.C
41.A

Electricity Exam

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

a. Double pole single throw switch

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