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521.

A column has its equivalent length equal to its length in case of

A.	both ends hinged	B.	one end hinged and one fixed
C.	both end fixed	D.	one end fixed, other free

522.

A shaft subjected to combined bending and torsion can be designed by the following stress theory

A.	Maximum normal stress theory	B.	Maximum shear stress theory
C.	Maximum energy theory	D.	Maximum octahedral stress theory

523.

Manganese in steel increases its

A.	Tensile strength	B.	Brittleness
C.	Hardness	D.	Ductility and Malleability

524.

Which of the following bearings will have least coefficient of friction?

525.

Stone crusher rolls are generally made of

526.

Which of the following is used as bearing lines

A.	Babbit metal	B.	Cast iron
C.	Brass	D.	Aluminium

527.

In gear design, addendum is equal to

A.	Module	B.	Twice of module
C.	Half of module	D.	One and a half times module

528.

For minimum noise use which type of gears are used

A.	Spur gears	B.	Bevel gears
C.	Helical gears	D.	Hypoid gears

529.

The ratio of lateral strain to linear strain is

A.	Strain ratio	B.	Stress ratio
C.	Poisson ratio	D.	Factor of safety

530.

For which of the following gears noise level is low

A.	cast iron gears	B.	alloys steel gears
C.	non metallic gears	D.	none of the above