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481.

In constant mesh transmission system, the gear used to control the noise is:

A.	Spur gear	B.	Bevel gear
C.	Helical gear	D.	Spiral gear

482.

The hydrostatic transmission system is popular in:

A.	tractors	B.	Combines
C.	Power tillers	D.	Crawlers

483.

Spur and helical gears transmit power between two:

A.	Parallel shafts	B.	Parallel shafts with intersecting axis
C.	Both (a) & (b)	D.	None of these

484.

Bevel gears transmit power between two shafts are:

A.	Intersecting axis	B.	Parallel shaft
C.	Inline shaft	D.	All are correct

485.

Spline shafts are used when the torque transmission is in:

A.	Small amount	B.	Large amount
C.	Both (a) & (b)	D.	None of these

486.

Hydraulic pump develops a pressure of about:

A.	150 kg/cm2	B.	180 kg/cm2
C.	200 kg/cm2	D.	250 kg/cm2

487.

Hydraulic system in tractor is mainly used for:

A.	Operating three point hitch	B.	PTO drive
C.	Both (a) & (b)	D.	None of these

488.

A gear used in the tractor hydraulic system normally is:

A.	Spiral type	B.	Helical type
C.	Bevel type	D.	Spur type

489.

A pump used in the tractor hydraulic is:

A.	Internal gear pump	B.	Gyrator gear pump
C.	Vane type pump	D.	All are correct

490.

An accumulator used in hydraulic system is for:

A.	Storing energy	B.	Increasing pressure
C.	Operating pump	D.	All are correct