Principles of Electrical Science

From a 50 metre cable drum, you have installed 13.6 metres of cable. What percentage of cable has been used?

• 3.8%

• 72.8%

• 27.2%

• 65%

An insulation resistance tester is used to record the following values: 55MΩ, 72MΩ, 55MΩ, 18.5Ω, 10 MΩ and 89MΩ. What is the mean of these values?

• 49.9MΩ

• 89MΩ

• 55MΩ

• 18.5MΩ

The SI unit for resistivity is?

• Ohm

• Ωm

• R

• Ω

Potential Difference is measured in?

• Amps

• Volts

• Newton's

• Joule's

In the SI system, time is measured in?

• Hours

• Minutes

• Seconds

• Kelvin's

Which instrument would be used to measure the resistance of a circuit?

• Ohm meter

• Conductance meter

• Continuity meter

• Amp meter

The SI unit for Capacitance is the?

• Volt

• Henry

• Hertz

• Farad

Lifting a load an electric motor uses 180,000 Joules of energy in 1 ½ minutes. What is the power rating of the motor?

• 500 W

• 1 kW

• 1.5 kW

• 2 kW

Crowbars are an example of what type of lever?

• Class 1

• Class 2

• Class 3

• Class 4

Force on a load is considered to be a combination of:

• mass and gravity

• time and acceleration

• weight and energy

• energy and work done