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Electricity 1 Year 12 Engineering

Total questions: 95

Worksheet time: 49mins

Name
Class
Date
1.
a)

A

b)

B

c)

C

d)

D

2.
a)

A

b)

B

c)

C

d)

D

3.
a)

A

b)

B

c)

C

d)

D

4.
a)

A

b)

B

c)

C

d)

D

5.
a)

A

b)

B

c)

C

d)

D

6.
a)

A

b)

B

c)

C

d)

D

7.

Which of the following devices raises voltage so that it can travel to long distances?

a)

POWER PLANT

b)

STEP-UP TRANSFORMER

c)

STEP-DOWN TRANSFORMER

8.

What energy transformation takes place in a generator?

a)

Electrical to mechanical energy

b)

Mechanical to electrical energy

c)

heat energy

9.

What do you call a facility of producing electricity from energy sources?

a)

Power plant

b)

transformer

c)

generator

10.

Mark turned on a lamp switch on her room. Which of the following is the correct path of electrical power that can be traced back to the source?

a)

power plant ⇒transmission substations ⇒distribution ⇒substations ⇒ residences A

b)

power plants ⇒distribution substation ⇒transmission substations⇒residences

c)

power plants ⇒distribution substations ⇒national grid ⇒ residences

11.

Give the correct order of transmission and distribution of electrical energy to consumers. 1 Distribution Substation 2 Power Plant 3 Transmission Station 4 Consumers

a)

1234

b)

2314

c)

4132

12.

Power plant generates electricity.

a)

True

b)

False

13.

Step-up transformers reduce the output voltage.

a)

True

b)

False

14.

Distribution substation uses big transformer to step up voltage.

a)

True

b)

False

15.

Transmission lines transport high-voltage electricity over long distances.

a)

True

b)

False

16.

Distribution lines carries electricity at lower voltage.

a)

True

b)

False

17.
Something that can convert electrical energy into other forms of energy (ex. light bulb, fan, tv, radio)
a)
resistor (device)
b)
source
c)
conductor
18.

Which of the following describe the characteristics of non-renewable energy sources?

i) can be depleted if the usage is not controlled

ii) takes millions of years to be formed

iii) can cause environmental pollution

iv) have limited sources

a)

i, ii and iii

b)

i, ii and iv

c)

i, iii and iv

d)

ii, iii and iv

19.
When the circuit shown is closed, none of the bulb lights up in the circuit above. Only one of the objects, A, B or C is an electrical insulator. Which one is it?
a)
A
b)
B
c)
C
20.

___________ disconnects the current supply temporarily when it is not needed (such as during repairing damaged wiring).

a)

ELCB circuit breaker

b)

MCB circuit breaker

c)

Main switch

d)

Electric meter

21.
Study the circuit diagram below. 
When the switch was closed, all the bulbs lighted up. Then, when one of the bulbs fused, all the bulbs went off. Which bulb was fused?
a)
A
b)
B
c)
C
d)
D
22.

Choose the safety components found in wiring system at home.

a)

Lightning conductor

b)

ELCB circuit breker

c)

MCB circuit breaker

d)

Electric meter

e)

Main switch

23.

The following information shows the energy changes in a type of generators.

Potential energy -> kinetic energy -> electric energy

a)

Thermal generator

b)

Nuclear generator

c)

Biomass generator

d)

Hydroelectric generator

24.

The statements below are about a type of energy source.

*The main source of energy

*Have heat and light energy

*Does not cause pollution

a)

Nuclear

b)

Water

c)

Geothermal

d)

Sun

25.
Study the set-ups below.
Which of the following bulbs with light up?
a)
A and B only 
b)
B and C only 
c)
A, and C only
d)
A, B and C
26.

Electricity is supplied to homes in the form of

a)

direct curent

b)

alternating current

27.

What is electricity?

a)

The movement of positive electrical charges

b)

The movement of negative electrical charges

c)

The movement of negative and positive electrical charges

d)

The movement of neutral electrical charges

28.

Which materials do not allow the electrons to flow through them?

a)

Conductors

b)

Semiconductors

c)

Insulators

d)

Superconductors

29.

Electricity.....

a)

is a primary source.

b)

is measured in Watts.

c)

isn't measured in Amps.

d)

is a secondary source.

30.

We get electricity from the conversion of......

a)

coal, nuclear energy, sun, wind.

b)

secondary energy sources.

c)

only non-renewable energy sources.

d)

only renewable energy sources.

31.

Examples of fossil fuels are....

a)

coal, petroleum, nuclear energy.

b)

oil, biomass, coal, wind.

c)

natural gas, sun, oil, water.

d)

coal, petroleum, natural gas.

32.

Which of the following is a primary energy source and non-renewable?

a)

Nuclear

b)

Biomass

c)

Electricity

d)

Water

33.

Which letter generally denotes current?

a)

I

b)

C

c)

W

d)

V

34.

Renewable sources of energy

a)

are unable to be reproduced once consumed.

b)

produce CO2.

c)

don’t replenish themselves.

d)

don’t produce greenhouse gases.

35.

A generator....

a)

stops the flow of energy.

b)

measures electricity.

c)

converts mechanical energy to electricity.

d)

is a reserve of chemical energy.

36.

Non-renewable energy sources can be used…

a)

 indefinitely.

b)

for a limited period of time.

c)

because they are sustainable.

d)

in the future for their low cost.

37.

What device increases or decreases the voltage of AC?

a)

 A capacitor.

b)

A generator.

c)

A switch.

d)

A transformer.

38.

Transmission lines....

a)

produce electricity from combustible fuels.

b)

carry electricity for short distances.

c)

carry electricity from power plants to our homes.

d)

don't transmit electricity over long distances.

39.

Where do you think that power is generated?

a)

At a service location. 

b)

In power lines.

c)

At a power plant.

d)

At a substation.

40.

What is the system of electricity transmission called? Do you know it?!

a)

The Net.

b)

The Web.

c)

The Grid.

d)

The Network.

41.

When moving neutrons hit the nuclei of certain other atoms thereby causing them to change, and this happens repeatedly, it is said to be a _______________________.

a)

nuclear chain reaction

b)

alpha radiation

c)

nuclear half-life

d)

control rod

42.

At a nuclear or fossil fuel power plants, these are referred to as __________________.

a)

cooling towers

b)

reactor towers

c)

smoke stacks

d)

vapor chambers

43.

The process of generating nuclear power is called ___

a)

nuclear alpha decay

b)

nuclear fusion

c)

nuclear fission

d)

nuclear fuel enrichment

44.

What is the function of a turbine?

a)

When it spins, it makes sparks, inducting electricity.

b)

It transfers the energy from the flow of steam or water to the generator.

c)

It speeds up the steam or water to keep it at a steady pace.

d)

It controls the steam or water so it can be pumped around in a cycle.

45.

What does a generator in hydroelectricity do?

a)

It spins when the water passes through it.

b)

It moves the water from a higher elevation to a lower elevation.

c)

It helps the movement of fish to pass safely through the dam.

d)

It electromagnetically induces electricity.

46.

The efficiency of coal fired power plants is typically

a)

10 - 20%

b)

30 - 40%

c)

50 - 60%

d)

70 - 80%

47.

The location of the largest amount of degraded energy in a fossil fuel or nuclear power plant is

a)

in the heat exchanger

b)

in the turbines

c)

in the generator

d)

in the condenser

48.

The moderator in a nuclear reactor

a)

slows neutrons down.

b)

speeds neutrons up.

c)

captures neutrons.

d)

enriches the uranium.

49.

Enriching uranium beyond 80% is done in order to . . .

a)

have controlled chain reactions.

b)

have uncontrolled chain reaction.

c)

produce slow neutrons.

d)

produce fast neutrons.

50.

Controlled chain reactions in a nuclear reactor is achieved using . . .

a)

a moderator.

b)

control rods.

c)

fuel pellets.

d)

heat exchanger.

51.

A typical tide change goes from 3 m above sea level to 2 m below sea level. What is the ∆h for the average energy generated in 12 hours?

a)

2.5 meters

b)

5.0 meters

c)

1.0 meter

52.

Pumped water storage is a great solution for

a)

generating power where water is scarce.

b)

storing surplus solar and wind power for later use.

c)

generating power in a flat location.

d)

eliminating fossil fuel power plants.

53.

Hydroelectric power is based on . . .

a)

gravitational potential energy of water.

b)

kinetic energy of water.

c)

chemical potential energy of water.

d)

elastic potential energy of water.

54.

1.23 x 103 kg of coal (specific energy 22 MJ kg-1) is burned in a 35% efficient power plant every hour. Determine the output power of this power plant.

a)

2.6 MW

b)

21 MW

c)

0.33 MW

d)

160 MW

55.

Determine the flow rate needed from a lake water storage hydropower dam with a water height of 20. m and an efficiency of 75% to produce 3.0 MW of power.

a)

20,000 kg s-1

b)

11,300 kg s-1

c)

200,000 kg s-1

d)

2,000 kg s-1

56.

Which Power Plant uses heat generated from Nuclear Fission to convert water into steam that turns generators to produce electricity?

a)

Nuclear

b)

Geothermal

c)

Diesel

d)

Coal-Fired

57.

Which among these are parts of a Coal-Fired Power Plant? (Choose any two answers.)

a)

Ash System

b)

Precipitators and Stack

c)

Engine

d)

Governing System

58.

Which among these is FALSE regarding Hydroelectric Power Plants?

a)

No fuel is required.

b)

There is minimal pollution.

c)

Requires high initial investment cost.

d)

Occupies less space.

59.

Which among these are classified as Renewable Energy Sources? (Choose any two answers.)

a)

Hydraulic Energy

b)

Biomass Energy

c)

Natural Gas

d)

Coal

60.

In Conventional Thermal Power Plants, what is used to heat water to produce steam that turns the Turbines?

(a)  

61.

Ammeter

a)
b)
c)
d)
62.

Buzzer

a)
b)
c)
d)
63.

Switch

a)
b)
c)
d)
64.

Resistor

a)
b)
c)
d)
65.

Voltmeter

a)
b)
c)
d)
66.

Thermistor

a)
b)
c)
d)
67.

Variable resistor

a)
b)
c)
d)
68.

LED

a)
b)
c)
d)
69.

Light dependent resistor LDR

a)
b)
c)
d)
70.

Battery

a)
b)
c)
d)
71.

Motor

a)
b)
c)
d)
72.

Diode

a)
b)
c)
d)
73.

Lamp

a)
b)
c)
d)
74.

Identify the electronic symbol.

a)

capacitor

b)

electrolytic capacitor

c)

battery

d)

resistor

75.

Identify the electronic symbol.

a)

coil

b)

inductor

c)

wire

d)

transformer

76.

Identify the electronic symbol.

a)

Line power

b)

Supply

c)

Ground

d)

Earth

77.

Identify the electronic symbol.

a)

Diode

b)

Photodiode

c)

Reflective diode

d)

Light Emitting Diode

78.

Identify the electronic symbol.

a)

Diode

b)

Photodiode

c)

Zener diode

d)

Light emitting diode

79.

Identify the electronic component.

a)

Photodiode

b)

Phototransistor

c)

Photoresistor

d)

Photocapacitor

80.

Identify the electronic component.

a)

Speaker

b)

Capacitor

c)

Battery source

d)

Buzzer

81.

Electronic component used to reduce current and voltage levels in circuit:

a)

Resistor

b)

Diode

c)

Capacitor

d)

Transistor

82.

The difference in charge between two points:

a)

Voltage

b)

Current

c)

Resistance

d)

Power

83.

Letter used to represent Amps:

a)

I

b)

V

c)

R

d)

Ω

84.

The current through a 330 Ω resistor with 5V applied across it:

a)

15mA

b)

0.15A

c)

1515A

d)

55mA

85.

If the voltage is increased in a circuit, the resistance must be increased to keep the current the same.

a)

True

b)

False

c)

It depends

d)

Bruh

86.

Identify this component

a)

LED

b)

Green Capacitor

c)

Transistor

d)

Light Bulb

87.

Identify this component

a)

Buzzer

b)

Speaker

c)

Opto-Electronic component

d)

Phototransistor

88.

When drawing schematics we use US symbols

a)

True

b)

False

89.

When drawing schematics labels should be oriented vertically

a)

False

b)

True

90.

In schematics wire junctions are represented by little dots called...

a)

nodes

b)

modes

c)

bodes

d)

jodes

91.

What term do Mountain Bikers use for the easiest gear on a bike?

a)

Granny Gear

b)

Easy Gear

c)

1st Gear

d)

Gnarly Gear

92.

What symbol is this?

a)

capacitor

b)

transistor

c)

diode

d)

resistor

93.

what symbol is this?

a)

Electric Motor

b)

Resistor

c)

Battery

d)

transistor

94.

What symbol is this?

a)

capacitor

b)

resistor

c)

fuse

d)

lamp

95.

What symbol is this?

a)

diode

b)

transistor

c)

LED

d)

lamp

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