EAL - Electrical Science and Principles Paper 1

The SI unit of measurement for Length is known as the

Metre

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Kilometre

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Centimetre

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Millimetre

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2. Electromotive Force (EMF) is measured in

Volts

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Ohms

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Watts

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Amperes

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15 microamperes (15µA) can be written as

0.0000015 A

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0.000015 A

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0.0015 A

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0.00015 A

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Re-arrange the formula shown to make R the subject

(V = IR)

R = V x I

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R = V + I

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R = V/I

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R = I/V

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What is the current draw of a lamp of 100Ω resistance connected to a 230 V supply?

2.3 A

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0.43 V

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23 V

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0.43 A

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What is the power of a circuit whose current is 2 amperes and resistance is 2 ohms?

8 Watts

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16 Watts

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2 Watts

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4 Watts

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The electrical energy used by a 1kW heater switched on for 3 hours would be

1 kW

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1 kWh

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3 kWh

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9 kW

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Using the table, what is the resistance of 100 m of aluminium cable with a Cross-Sectional-Area(CSA) of 2.5 mm²

Material	Resistance in Ωm:
Silver	16.4 x 10¯9
Copper	17.5 x 10¯9
Iron	100 x 10¯9
Aluminium	28.5 x 10¯9
Brass	75x 10¯9

0.01Ω

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1.2 Ω

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1.14 Ω

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1.14 X 10* Ω

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Resistivity can be defined as

the power consumed by a piece of electrical equipment

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a materials ability to pass current

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a material’s ability to resist the flow of electrons through it

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the flow of free electrons through a material

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In the picture, the load is shown at position

2

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3

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1

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4

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A good conductor is

polyvinylchloride (PVC)

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plywood

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rubber

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aluminium

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The source of Electromotive Force (EMF) in a Gas Turbine is

wind

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Fossil Fuels

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Sunlight

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Water

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Current flow can be described as the flow of

Free electrons

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Free neutrons

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The nucleus

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The protons

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A reduction in voltage between the source and the outlet is known as

Power variance

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Voltage drop

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Surge protection

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Current difference

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How is a voltmeter connected into a circuit?

In a dead circuit

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Along the flow of current

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In parallel

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In series

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A photo voltaic (PV) system uses which source of energy?

Water

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Fossil Fuels

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Sunlight

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Wind

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Distribution voltage at street level is

400 kV

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11 kV

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33 kV

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400/230 V

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A land mounted micro turbine produces electricity from

Wind

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Water

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Gas

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Sunlight

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What part of a micro hydro system is the penstock?

Wall

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Turbine

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Pipeline

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Storage Tank

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A micro generation technology that uses sunlight to heat water is called

Photovoltaic

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Solar thermal

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Biomass

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An air source heat pump

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One advantage of micro generation is

It cuts Oxygen Dioxide emissions

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It is cheap to install

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It has no maintenance costs

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It doesn’t deplete the Earth’s resources

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The resistance of a group of resistors connected in parallel is always

Same as highest individual value

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Lower than the lowest individual value

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Higher than the highest individual value

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The same as the lowest value

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In a circuit consisting of three 10 Ω lamps connected in a series, the total resistance would be

30Ω

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0.03Ω

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0.3Ω

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3.33Ω

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The formula used to calculate total resistance in a parallel DC circuit is

Rt =1/R1 +1/R2 +1/R3

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Rt = R1 +R2 +R3

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1/Rt =1/R1 +1/R2 +1/R3

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1/Rt = R1 +R2 +R3

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In the picture, with the lines of magnetic flux moving in the direction of Arrow A, the current would be flowing

The opposite direction of arrow A

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Away from you

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Towards you

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The same direction as arrow A

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The picture shows Fleming’s Right Hand Rule, what does the thumb indicate?

Directions of the windings

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Direction of current flow

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The magnetic field

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Motion of the conductor

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A relay uses which type of effect of an electric current

Chemical

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Light

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Heating

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Electro-magnetic

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The pictured Alternating current (AC) generator provides an AC waveform to the circuit by use of

Carbon springs

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A commuter

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Loop brushes

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Slip rings

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The sinewave voltage shown has a periodic time of 10 ms

What is the frequency of this supply?

20 Hz

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60 Hz

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50 Hz

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100 Hz

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Alternating current is used for transmission and distribution because it

Allows voltages to be at a safe level

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Has no maintenance costs

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Has less current loss due to the high voltage/low current configuration

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Allows current to be direct

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In a star connected transformer what voltage would be measured between any one of the three lines and neutral?

1000 V

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400 V

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500 V

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230 V

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One difference between a star and delta connected transformer is the delta

is not connected to Earth and has no neutral

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has two conductors only

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is connected to earth but has no neutral

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is not connected to Earth but has a neutral

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The conductor used in a star connected three phase transformer which carries out of balance current is

The neutral conductor

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Line conductor 1

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Line Conductor 2

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Line conductor 3

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One possible danger of not balancing loads correctly over a three phase system is

Increased heat in the main earthing conductor

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An increase in voltage on the line conductor

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Increased heat in the neutral conductor

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Inconsistent voltage values

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Which component conducts current between stationary wires and the rotating part of a motor?

The field winding

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The armature

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The commutator

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The carbon brushes

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In the picture of Fleming’s left hand rule what is the finger represent by the green arrow indicating

Direction of the windings

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Direction of the conductor

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Direction of the current

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Direction of the field (N to S)

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the picture, with 5 windings on the primary side and 15 windings on the secondary, the secondary voltage would be

690 V

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1150 V

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230 V

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115 V

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Which instrument uses the principles of a current transformer for its operation?

Earth fault loop impedance meter

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Clamp ammeter

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Insulation resistance tester

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Digital voltmeter

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The supply and distribution system uses transformers with one combined winding

These are called

Safety transformers

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Isolating transformers

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Autotransformers

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Mono-transformers

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EAL – Electrical Science and Principles Paper 1

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