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721.

In disc plough, the angle at which the plane of cutting edge of disc is inclined to the vertical line is:

A.	Disc angle	B.	Tilt angle
C.	Gang angle	D.	None of above

722.

Disc angle of standard disc plough varies from:

A.	15-25?	B.	25-35?
C.	35-42?	D.	4-45?

723.

Tilt angle of standard disc plough varies from:

A.	15-25?	B.	25-35?
C.	35-42?	D.	4-45?

724.

In disc plough, a device used to prevent disc from clogging is:

A.	Spacer	B.	Scraper
C.	Standard	D.	Spool

725.

Back furrow and dead furrows are left while ploughing with:

A.	One-way plough	B.	Two-way plough
C.	Both (a) & (b)	D.	None of these

726.

A MB plough, which is suitable for ploughing along hillsides, is:

A.	One-way plough	B.	Two-way plough
C.	Both (a) & (b)	D.	None of these

727.

The tilt angle of wheat plough is:

A.	0?	B.	15-25?
C.	35-42?	D.	42-45?

728.

Tillage system, which is suitable for dry land agriculture, is:

A.	Till plant system	B.	Zero tillage
C.	Minimum tillage	D.	All are correct

729.

A tillage system in which the field is ploughed and followed by row crop planter directly is:

A.	Zero tillage system	B.	Plough plant
C.	Rotary tillage system	D.	Till plant system

730.

The depth measured at the centre of the disc by placing its concave side down on a flat surface is:

A.	Convexity	B.	Concavity
C.	Both (a) & (b)	D.	None of these