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511.

The bending moment at a plastic hinge is

A.	equal to zero	B.	equal to yield moment of the section
C.	equal to plastic moment of the section	D.	greater than plastic moment of the section

512.

The following type of mechanism is not possible in any framed structure as an independent mechanism

A.	Beam mechanism	B.	Joint mechanism
C.	Cable mechanism	D.	Panel (sway) mechanism

513.

The assumption of bi-linearly idealised stress-strain relationship for plastic analysis and design is used for

A.	aluminium structures	B.	prestressed concrete structures
C.	reinforced concrete structures	D.	steel structures

514.

When a section of a beam is plastified due to given system of loading then

A.	the whole length of beam is plastified	B.	the length of beam over which the moment is less than the yield moment is plastified
C.	the length of beam over which the moment is geater than or equal to the yield moment is plastified	D.	only one section of beam is plastified

515.

The number of plastic hinges necessary to convert a framed structure into a mechanism is (r is degree of redundancy of the structure)

A.	r + 1	B.	r - 1
C.	2r + 1	D.	2r - 1

516.

In case the number of plastic hinges at failure is less than (r+1), where r is the degree of redundancy of the structure then the type of collapse of structure is

A.	complete collapse	B.	elastic collapse
C.	over complete collapse	D.	partial collapse

517.

Piston rings are usually made of

A.	Cast iron	B.	Stainless steel
C.	High carban steel	D.	Aluminium

518.

The following property is the most important for normal used for gas turbine blades

A.	Fatigue	B.	Creep
C.	Resistance to bending	D.	Resistance to shear

519.

The efficiency of a screw track is maximum when its helix angle '?' is equal to

A.	45?	B.	45 - ?
C.	45 - ?/2	D.	45 + ?/2

520.

In the case of a cantilever, irrespective of the type, loading of the maximum bending moment and maximum shear force occur at

A.	Fixed end	B.	Centre
C.	?rd of length from fixed end	D.	Free end