Question 1

The Tesla is the unit of:

• Magnetic flux density.

• Magnetic flux.

• Inductance.

• Electro-magnetism.

Question 2

Light is produced in a discharge lamp by:

• Passing a current through a diode.

• Passing a current through a conducting filament.

• Passing current through a gas or vapour.

• Chemical reaction.

Question 3

An incandescent lamp produces light by:

• Passing a current through gas.

• Passing a current through vapour.

• Chemical reaction.

• Passing a current through a conducting filament.

Question 4

Which one of these formulas would you use for determining the resistance of a circuit?

• P = VI

• R = VI

• V/I = R

• P/V = I

Question 5

For the purposes of diversity, what is the assumed demand for a 50 A domestic cooker?

• 50 A

• 46.98 A

• 35.54 A

• 22 A

Question 6

The circumference of any circle divided by its diameter will always be

• 3.421159

• 1.3142159

• 3.142159

• 3.412159

Question 7

What is the area of a circle whose diameter is 10mm

• 78.54 square millimetres.

• 78.54 millimetres.

• 31.42 square millimetres.

• 31.42 millimetres.

Question 8

The symbol

I

is the quantity for which of the following?

• Electric current.

• Resistance.

• Voltage.

• Electromotive force.

Question 9

What is the SI base unit for mass?

• m

• kg

• I

• s

Question 10

What is the name of the current that is produced by the movement of a magnet relative to a coil?

• An induced current.

• A flux.

• An alternating current.

• A direct current.

Question 11

If three identical lamps are connected in parallel and connected to a 12 volts supply, what will be the e.m.f. across each lamp?

• 6 Volts.

• 4 Volts

• 3 Volts.

• 12 Volts

Question 12

If a single circular section conductor has a diameter of 2.256 mm, what is its cross-sectional area?

• 4 mm squared.

• 7.08 mm squared.

• 16 mm squared.

• 9.87 mm squared.

Question 13

If three identical lamps are connected in series to a 12 volt supply, what will the e.m.f. across each lamp be?

• 4 Volts across each lamp.

• 3 Volts across each lamp

• 12 Volts across each lamp

• 6 Volts across each lamp

Question 14

What is the unit of mass?

• Tesla.

• Newton.

• Graviton.

• Kilogram.

Question 15

For the purposes of diversity, what is the assumed current demand for a 13 A domestic water heater?

• 10.9 A

• 12.9 A

• 9 A

• 13 A

Question 16

What is the volume of a cylinder whose diameter is 2.5 metres and whose length is 8 metres

• 39.27 cubic metres.

• 157.08 cubic metres.

• 20 cubic metres.

• 7.85 cubic metres.

Question 17

What is the CSA of a cable with a nominal diameter of 2.5mm?

• 3.5 square millimetres

• 5.91 square millimetres

• 4.91 square millimetres

• 5 square millimetres

Question 18

If the element of an electric heater has a working resistance of 9 Ohms when supplied with 230 volts, what is the current flowing in the circuit?

• 25.5 A

• 30 A

• 20 A

• 13 A

Question 19

Which of the following is the common quantity symbol for potential difference?

• V.

• F.

• p.

• A.

Question 20

What would be the approximate maximum current demand of a domestic cooker rated at 12.5 kW?

• 62.5 A

• 50 A

• 65 A

• 54.5 A

ANSWERS!!!!

Question 1

The Tesla is the unit of:

Correct Answer: Magnetic flux density.

Question 2

Light is produced in a discharge lamp by:

Correct Answer: Passing current through a gas or vapour.

Question 3

An incandescent lamp produces light by:

Correct Answer: Passing a current through a conducting filament.

Question 4

Which one of these formulas would you use for determining the resistance of a circuit?

Correct Answer: V/I = R

Question 5

For the purposes of diversity, what is the assumed demand for a 50 A domestic cooker?

Correct Answer: 22 A

Question 6

The circumference of any circle divided by its diameter will always be

Correct Answer: 3.142159

Question 7

What is the area of a circle whose diameter is 10mm

Correct Answer: 78.54 square millimetres.

Question 8

The symbol

I

is the quantity for which of the following?

Correct Answer: Electric current.

Question 9

What is the SI base unit for mass?

Correct Answer: kg

Question 10 1 of 1 points

What is the name of the current that is produced by the movement of a magnet relative to a coil?

Correct Answer: An induced current.

Question 11

If three identical lamps are connected in parallel and connected to a 12 volts supply, what will be the e.m.f. across each lamp?

Correct Answer: 12 Volts

Question 12

If a single circular section conductor has a diameter of 2.256 mm, what is its cross-sectional area?

Correct Answer: 4 mm squared.

Question 13

If three identical lamps are connected in series to a 12 volt supply, what will the e.m.f. across each lamp be?

Correct Answer: 4 Volts across each lamp.

Question 14

What is the unit of mass?

.Correct Answer: Kilogram.

Question 15

For the purposes of diversity, what is the assumed current demand for a 13 A domestic water heater?

Correct Answer: 13 A

Question 16

What is the volume of a cylinder whose diameter is 2.5 metres and whose length is 8 metres

Correct Answer: 39.27 cubic metres.

Question 17

What is the CSA of a cable with a nominal diameter of 2.5mm?

Correct Answer: 4.91 square millimetres

Question 18

If the element of an electric heater has a working resistance of 9 Ohms when supplied with 230 volts, what is the current flowing in the circuit?

Correct Answer: 25.5 A

Question 19

Which of the following is the common quantity symbol for potential difference?

Correct Answer: V.

Question 20

What would be the approximate maximum current demand of a domestic cooker rated at 12.5 kW?

Correct Answer: 54.5 A

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