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281.

Temperature stresses are set up in a material when

A.	it is free to expand or contract	B.	it is first heated and then cooled
C.	it is first colled and then heated	D.	its expansion or contraction is restrained

282.

Principal planes are the planes on which the resultant stress is the

A.	shear stress	B.	normal stress
C.	tangential stress	D.	temperature stress

283.

Moment area method is useful determining the following in a beam:

A.	slope and deflection at point	B.	Shear force and bending moment at a point
C.	tensile and compressive stresses at a point	D.	None of the above

284.

Perry-Robertson formula for columns takes into account

A.	initial curvature of column	B.	initial eccutricity of column
C.	both (A) and (B) above	D.	None of the above

285.

Arching of a beam results in

A.	increased bending moment throughout	B.	reduced bending moment throughout
C.	increased bending moment at the support	D.	no change in bending moment

286.

In the case of biaxial state of normal stresses, the normal stress on 45? plane is equal to

A.	the sum of the normal stresses	B.	the difference of the normal stresses
C.	half the sum of the normal stress	D.	half the difference of normal stresses

287.

Under uniaxial strain, the ratio of maximum shearing strain to uniaxial strain is

A.	2	B.	1.5
C.	1	D.	0.5

288.

A hole, one metre from the end of a structural steel member, is 0.8 mm shy of matching another hole for possible connection. What force, in kN, is necessary to stretch it for connection? The cross section is 25 mm x 3 mm

A.	12.6	B.	13.6
C.	14.7	D.	15.8

289.

Brass could not be used to reinforce concrete because

A.	its densily is too large	B.	its density is too low
C.	it is too expensive	D.	its coefficient of thermal expansion is not right

290.

Euler's formula is not applicable to columns

A.	with both ends free	B.	with both ends fixed
C.	of composite material	D.	having slenderness ratio less than 80