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241.

In oilless bearings

A.	There is no external supply of lubricant	B.	The lubrication is achieved by adding sulid lubricants
C.	Grease is used for lubrication	D.	Graphite is used for lubrication
E.	None of the above

242.

In a ball bearing steel balls are made of

243.

Small steel balls are manufactured by

244.

The balls in a ball bearing remain in position

245.

The advantage of needle roller bearing over ball bearing is

A.	Less friction	B.	Less area requirement
C.	Smooth operation	D.	Large ratio of load capacity to size
E.	None of the above

246.

In a ball bearing a sleeve is fixed to

A.	Carry more load	B.	Reduce friction
C.	Reduce wear	D.	Prevent relative axial movement between the shaft and bearing
E.	To protect bearing against dust etc.

247.

A taper bearing has

248.

Spring stiffness is

A.	Load carrying capacity of spring	B.	Load per unit area of base
C.	Load/cross-sectional area of spring	D.	Load/unit deflection
E.	None of the above

249.

The ends of the coil of compression spring which are in contact with the seat are

A.	Most active	B.	Inactive
C.	As active as spring	D.	Have significant role in compression
E.	Carry maximum load

250.

Two springs having stiffness are in series. The equivalent stiffness would be