Principle of Engineering L2

A 110 volt socket supplies a spot light with a resistance of 220 ohms. How much current (amps) is flowing through the light?

• 0.5 amps

• 2.0 amps

• 110 amps

• 330 amps

The average length of mild steel round bar used in a workshop is 24.354 m. What is the amount used when quoted to one decimal place?

• 24.0 m

• 24.3 m

• 24.4 m

• 25.0 m

What is the area of a rectanguler plate measuring 4.37 m x 2.07 m correct to two decimal places?

• 2.30 m2

• 2.44 m2

• 9.05 m2

• 9.24 m2

Which one of the following materials has the lowest melting point?

• Aluminium

• Magnesium

• Zinc

• Lead

Which one of the following materials is "ferromagnetic".

• Aluminium

• Steel

• Brass

• Copper

What metal is used for the manufacture of a file?

• High carbon steel

• Low carbon steel

• Brass

• Aluminium

What is the result of increasing the carbon percentage in steel?

• Decreases tensile strength

• Increases hardness

• Increases impact strength

• Decreases hardness

Which property of zinc alloys makes them most suitable for casting components?

• High melting point

• Low melting point

• Low corrosion resistance

• Low impact strength

What effect will annealing have on steel properties?

• Increases melting point

• Reduces melting point

• Increases hardness

• Reduces hardness

What is the correct method for normalising heat treatment of steel?

• Heat and allow to cool slowly in air at room temperature

• Heat and cool slowly

• Heat and cool quickly in water

• Heat up until the melting point is reached and allow to cool