Explanation

• When the brake shoe or brake pad presses against a rotating drum or disc, friction is produced.
• This friction converts the tractor’s kinetic energy into heat energy, slowing down or stopping the wheels.
• Brake effectiveness depends on the friction between the braking surfaces and the condition of the brake components.

Last verified on 16-10-2026

Explanation

• Saturated vapour exists at the saturation temperature corresponding to a given pressure.
• During boiling, liquid water changes into steam at its saturation temperature, provided the pressure remains constant.
• At standard atmospheric pressure, water boils at approximately 100°C, and its saturation pressure is approximately 101.325 kPa.

Last verified on 16-10-2026

Explanation

• The number of spark plugs needed in a diesel engine is zero
• Diesel engines use compression ignition instead of a spark.
• Air is compressed until it is hot enough to ignite the fuel.
• Instead of spark plugs, they use glow plugs to warm the engine when cold

Explanation

• A change of 1 Kelvin (K) is equal in magnitude to a change of 1 degree Celsius (°C).
• Therefore, a rise of 10 K equals a rise of 10°C.
• The numerical values of Kelvin and Celsius differ when expressing an actual temperature, but their temperature intervals are equal.

Last verified on 16-10-2026

Explanation

• Strain is the ratio of the change in length to the original length of a material when a force is applied.
• It measures the relative deformation of a material.
• It has no unit, because it is a ratio of two lengths.

Last verified on 16-10-2026