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461.

Multiple disc clutches is:

A.	Wet type	B.	Dry type
C.	Both (a) & (b)	D.	None of these

462.

Multiple disc type clutches are mostly used in:

A.	General purpose tractor	B.	Crawler tractor
C.	Power tillers	D.	None of these

463.

Gears are generally made of:

A.	Cast iron	B.	High crabon steel
C.	Aluminium alloy	D.	Alloy steel

464.

Lubricant used in gearbox is:

A.	SAE 30	B.	SAE 40
C.	SAE 90	D.	None of these

465.

Transmission oil should be changed after:

A.	750 hours	B.	800 hours
C.	1000 hours	D.	1200 hours

466.

Reduction of engine speed through transmission gearbox ranges between:

A.	1 and 1/5th highest and lowest	B.	1 and 1/6th
C.	1 and 1/8th	D.	None of these

467.

Generally tractor speed in the top gear varies from:

A.	12-18 kmph	B.	12-25 kmph
C.	18-24 kmph	D.	All are correct

468.

Forward speed of crawler tractor is restricted to about:

A.	5 kmph	B.	6 mph
C.	10 kmph	D.	Both (b) & (c)

469.

Differential lock helps to:

A.	Developing full traction in both drive & wheel	B.	Developing full traction in one drive wheel
C.	Both (a) & (b)	D.	None of these

470.

Speed reduction ratio of final drive ranges from:

A.	3 to 5:1	B.	2 to 4:1
C.	3 to 6:1	D.	2 to 5:1