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641.

Centre of gravity of tractor is determined by:

A.	Suspension method	B.	Balancing method
C.	Weighing method	D.	All are correct

642.

The PTO HP of a tractor is:

A.	Less than drawbar	B.	More than engine HP
C.	More than drawbar HP	D.	Less than friction HP

643.

The most commonly used method for determination of centre of gravity of tractor is:

A.	Suspension method	B.	Balancing method
C.	Weighing method	D.	All are correct

644.

Main constitute is:

A.	Methane	B.	Ethane
C.	Butane	D.	Carbon dioxide

645.

In SI engine, intake opens about:

A.	10 deg before TDC	B.	At TDC
C.	10 deg after TDC	D.	20 deg after TDC

646.

The base function of governor in an engine is to regulate the:

A.	Fuel consumption	B.	Power development
C.	Engine speed	D.	None of these

647.

The ratio of rolling resistance to dynamic load is:

A.	Coefficient of traction	B.	Tractive efficiency
C.	Coefficient of rolling resistance	D.	Rolling resistance

648.

The power developed by an average pair of bullocks varies from:

A.	0.0-5 hp	B.	0.5-1.0 hp
C.	1.0-1.5 hp	D.	1.5-2.0 hp

649.

Ratio of total force output of the traction device in direction of travel to dynamic weight on traction device is:

A.	Tractive efficiency	B.	Coefficient of traction
C.	Coefficient of rolling resistance	D.	Wheel slip

650.

The rear part of a tractor is heavier than the front part of tractor to get:

A.	Higher tractive efficiency	B.	Lower tractive efficiency
C.	Less wheel slip	D.	All are correct