IMI L3 Engine science Quiz

What is tractive effort?

• The opposition to tractive effort or vehicle movement.

• The trust at the driving wheels making the vehicle move.

• The force necessary to maintain a constant speed of about 1 km/h.

• The ratio of work done by the transmission compared to the work put into the transmission.

What is tractive (rolling) resistance?

• The trust at the driving wheels making the vehicle move.

• The opposition to tractive effort or vehicle movement.

• The force necessary to maintain a constant speed of about 1 km/h.

• The ratio of work done by the transmission compared to the work put into the transmission.

What is gradient resistance?

• The trust at the driving wheels making the vehicle move.

• The opposition to tractive effort or vehicle movement.

• A vehicle moving up a gradient has its forward motion opposed by a force known as gradient resistance.

• The ratio of work done by the transmission compared to the work put into the transmission.

How does air resistance vary?

• According to the shape and speed of the vehicle.

• According to the weight of the vehicle.

• According to the type of fuel used.

• According to the color of the vehicle.

What is transmission efficiency?

• The trust at the driving wheels making the vehicle move.

• The opposition to tractive effort or vehicle movement.

• The force necessary to maintain a constant speed of about 1 km/h.

• The ratio of work done by the transmission compared to the work put into the transmission.

What is meant by the term ‘angular velocity’?

• The rate of change of linear displacement

• The rate of change of angular displacement

• The rate of change of speed

• The rate of change of acceleration

A road wheel rotates at 3500 rev/min. What is its angular velocity in radians/s?

• 366.52 radians/s

• 366.52 degrees/s

• 366.52 meters/s

• 366.52 rev/s

The speed of the wheel increases from 150 rev/min to 250 rev/min in 20 seconds. What is the angular acceleration?

• 0.083 radians/s²

• 0.083 degrees/s²

• 0.083 meters/s²

• 0.083 rev/s²

Explain the meaning of Centrifugal and Centripetal force; give examples where these forces can be found in a vehicle.

• Centrifugal force is the force that pulls an object towards the center of a circular path, and Centripetal force is the force that pushes an object away from the center.

• Centrifugal force is the force that pushes an object away from the center of a circular path, and Centripetal force is the force that pulls an object towards the center.

• Both Centrifugal and Centripetal forces push an object away from the center of a circular path.

• Both Centrifugal and Centripetal forces pull an object towards the center of a circular path.

A centrifugal governor weight has a mass of 0.2 kg and rotates at a radius of 15 mm at 6000 rev/min. Calculate the centrifugal force produced by the weight.

• 118.8 N

• 118.8 kg

• 118.8 m/s²

• 118.8 J