Unit 262 – Multiple choice practice exam

Which of the following is a unit of weight?

• Newton

• Newton per square metre

• Kilogram

• Metre

Which defines power the best

• Power is proportional to the square of the time taken

• Power is done when a force is moved through a distance

• Power is the quality of the energy

• Power is the rate of consumption of energy

The voltage supplying a transformer is increased from 15 V to 45V by increasing the voltage, the magnetic field is

• Decreased by a factor of three

• Increased by a factor of 3

• Decreased by 33%

• Increased by 33%

From Table 1, which of the following lists the Young’s Modulus from low density to high density

• Gold/Silver/Copper/Steel/Aluminium

• Aluminium/Steel/Copper/Silver

• Steel/Copper/Aluminium/Gold/Silver

• Aluminium/ silver/ gold/copper/steel

A force of 12.1 newtons moved through a distance of 20 m. The work done is

• 2.42 joules

• 242 joules

• 0.605 joules

• 2371.6 joules

If the rating of transformer exceeds the effect would be

• Overheats and resistance reduction

• Cools and resistance increases

• Overheats and insulation breakdown

• Cools and insulation breakdown

Which two properties affects the voltage drop along a cable

• Area and type of insulation

• Resistivity and density

• Resistivity and length

• Area and tensile strength

A disconnected cable may be live because of which of the following

• Mutual Inductance

• Lenz’s Law

• A decrease in temperature

• Increased conductivity

Energy may be stored in a cable due to

• Resistance

• Capacitance

• Impedance

• Conductivity

What statement describes about electrons

• Positively charged

• Heavier than protons

• Heavier than neutrons

• Negatively charged