# Farm Machinery Questions and Answers – Traction and Traction Theory – 2

This set of Farm Machinery Objective Questions & Answers focuses on “Traction and Traction Theory – 2”.

1. What causes reduction in speed during the movement of wheels?
a) Slip
b) Acceleration
c) Pump
d) Hydraulics

Explanation: The power developed in engine, finally goes to wheel or tracks, which move the tractor with or without an attached load. During the movement of wheels, some slip occurs, which causes reduction in speed.

2. How is traction and the direction of travel related?
a) Traction is the slip in the direction of travel
b) Traction is the force in the direction of travel
c) Traction is equal to the direction of travel
d) Traction is inversely proportional to the direction of travel

Explanation: Traction is the force in the direction of travel, developed by the traction device medium and transferred to the vehicle. The power developed in engine, finally goes to wheel or tracks, which move the tractor with or without an attached load.

3. What is co-efficient of traction?
a) C.O.T = (Total force output of the traction device in the direction of travel) + (Dynamic weight on traction device)
b) C.O.T = (Total force output of the traction device in the direction of travel) – (Dynamic weight on traction device)
c) C.O.T = (Total force output of the traction device in the direction of travel) * (Dynamic weight on traction device)
d) C.O.T = $$\frac{Total \, force \, output \, of \, the \, traction \, device \, in \, the \, direction \, of \, travel}{(Dynamic \, weight \, on \, traction \, device)}$$

Explanation: The coefficient of traction is defined as the usable force for traction divided by the weight on the running gear. It can also be defined as the ratio of the total force output of the traction device in the direction of travel to the dynamic weight on traction device.

4. What is tractive efficiency?
a) Input power – Output power
b) Input power + Output power
c) $$\frac{Output \, Power}{Input \, Power}$$
d) Output power * Input Power

Explanation: Tractive efficiency is the ratio of the drawbar power to axle power and can be estimated wen the slip is known. TE of a wheel can be predicated using a series of equations that take into account tire dimensions, soil conditions, slip, etc. It is the ratio of output power to input power, expressed in percentage.

5. What is wheel slip?
a) (N1 + N2) * N1
b) $$\frac{N1-N0}{N1}$$*100
c) (N1 + N2) * 100
d) $$\frac{N1}{N1-N0}$$*100

Explanation: Wheel slip is the relative movement of the wheel or track in direction of travel for a given distance under load and at no load condition.
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6. What is term used to designate the tractive force between the rubber tyres of the driving wheel and the surface on which they travel?
a) Rolling resistance
b) Crawler
c) Rim pull
d) Wheel slip

Explanation: Rim pull is a term which is used to designate the tractive force between the rubber tyres of the driving wheel and the surface on which they travel. The coefficient of traction is high enough to eliminate tyre slippage.

7. What are the chains known as in track frame assembly of the Crawler Tractor?
a) Track
b) Break
c) Pull
d) Idler

Explanation: Track frame consists of two heavy endless metal chains moving on two iron wheels. These chains are called tracks. One wheel carries sprockets and acts as river unit, the other wheel serves as an idler.

8. Which tyres are used for common tractors?
a) Metal
c) Welded
d) Pneumatic

Explanation: Pneumatic tyres are used for common tractors. When such a tractor moves over soil, it has to overcome the rolling resistance R.

9. Which motor is used in tramways?
a) AC single phase capacitor start motor
b) AC three phase motor
c) DC series motor
d) DC shunt motor

Explanation: A tram is a passenger vehicle powered by electricity conveyed by overhead cables and running on rails laid on a public road. The motor depends on the type of locomotive and the torque or tractive effort required.

10. Overall efficiency of steam locomotive system is close to ________
a) 5-10%
b) 25-30%
c) 55-60%
d) 75-80%

Explanation: A steam locomotive is a type of railway locomotive that draws its pulling power through a steam engine. This locomotive is used to produce steam in the boiler by burning combustible material. Overall efficiency of steam locomotive system is close to 5-10%.

11. Energy required to overcome the rolling resistance which is equal to the work done in deforming the soil is known as _________
a) Wheel slip
b) Rim pull
c) Tractive efficiency
d) Rolling resistance

Explanation: The rolling resistance due to soil compaction can be approximated by assuming that the energy required to overcome the rolling resistance is equal to the work done in deforming the soil.

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