Agricultural/Bioengineering Tractor and Power Engineering

Question 1

The rated PTO speed of a standard agricultural tractor in the US is:

Accepted Answer

540 or 1000 rpm

Answer

1200 or 1800 rpm

Answer

300 or 600 rpm

Answer

2400 or 3000 rpm

Question 2

Drawbar power of a tractor is calculated as:

Accepted Answer

Drawbar pull × field travel speed

Answer

Engine torque × angular velocity

Answer

PTO torque × PTO shaft speed

Answer

Engine power minus transmission losses only

Question 3

Wheel slip in tractor operation is defined as the difference between:

Accepted Answer

Theoretical wheel travel distance and actual distance traveled

Answer

Engine speed and PTO speed

Answer

Front and rear axle speeds

Answer

Loaded and unloaded ground clearance

Question 4

The three-point hitch category on a tractor is determined by:

Accepted Answer

Hitch pin diameter and vertical dimensions based on tractor power range

Answer

Engine displacement

Answer

Hydraulic pump pressure

Answer

Tire size and wheelbase

Question 5

Engine compression ratio in a diesel engine is typically in the range of:

Accepted Answer

14:1 to 22:1

Answer

6:1 to 9:1

Answer

10:1 to 12:1

Answer

25:1 to 30:1

Question 6

Tractor ballasting is performed primarily to:

Accepted Answer

Optimize traction by matching tractor weight to drawbar load and soil conditions

Answer

Reduce fuel consumption at all times

Answer

Increase ground clearance for row crops

Answer

Lower the center of gravity for road transport only