L2 Principles of Engineering 1/03/23

What effect will annealing have on steels properties?

• Reduces melting point.

• Reduces hardness.

• Increases hardness.

• Increases melting point.

What power is used when welding at 80 amperes at 35 volts?

• 2.28 Kw

• 2.8 Kw

• 45 Kw

• 115 Kw

What is the work done (W) when a force of 240 N moves a vehicle through a distance of 6 m?

• 0.025 J

• 40 J

• 246 J

• 1440 J

What is the force (N), of a mass of 18 kg when the acceleration due to gravity is 9.81 m/s?

• 176.6 N

• 27.81 N

• 1.83 N

• 0.55 N

What is the area of a right angled triangle with a base of 4 cm and a height of 6 cm?

• 10 cm2

• 12 cm2

• 24 cm2

• 48 cm2

A heater has an efficiency of 74% and it gives a heat output of 5.4 Kw. What is the input?

• 4.0 Kw

• 5.4 Kw

• 6.8 Kw

• 7.3 Kw

What is the area of a triangle with a height of 800 mm and a base of 600 mm?

• 1.33 mm2

• 1400 mm2

• 240000 mm2

• 480000 mm2

A digital thermometer shows a reading of 32.1679 o C. What is the temperature when quoted to two decimal places?

• 32.20o C

• 32.17o C

• 32.16o C

• 32.10o C

What operation processes materials by material removal techniques?

• Machining.

• Welding.

• Forming.

• Casting.

What property is required for the manufacture of chemical storage tanks?

• Flexibility.

• Thermal conductivity.

• Corrosion resistance.

• Appearance.