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171.

Principal plane has

A.	Maximum shear stress	B.	No shear stress
C.	No compressive stress	D.	Maximum tensile stress
E.	Maximum compressive stress

172.

Shear stresses on mutually perpendicular planes are

A.	Zero	B.	Equal
C.	Minimum	D.	Maximum
E.	Unequal

173.

The damping capacity of a material is its capacity to

A.	Withstand shear stress	B.	Neutralise torsional stress
C.	Absorb noise	D.	Absorb shocks and vibrations
E.	Provide rigid joints

174.

Which of the following materials can be used for absorption of shock?

A.	Rubber	B.	Wood
C.	sawdust	D.	Lead sheet
E.	Any of the above

175.

A tower subjected to load W has self-weight 2W. It is to be designed for constant compressive stress at all sections. The cross-section of the tower should have

A.	Tapering section	B.	Circular section
C.	Parabolic section	D.	Hyperbolic section
E.	None of the above

176.

During the tensile test on a glass rod, the nature of stress section curve is

A.	Straight line	B.	Vertical line
C.	Horizontal line	D.	Sudden break
E.	Same as that for mild steel

177.

The shear stress required to cause plastic deformation of solid metals is known as

A.	Flow stress	B.	Proof stress
C.	Rupture stress	D.	Ultimate stress
E.	None of the above

178.

The kern of a circular section of diameter D is a concentric circular area of diameter

A.	3/4 D	B.	3/5 D
C.	2/3 D	D.	D/4
E.	D/8

179.

The instrument used for the measurement of expansion and contraction due to change in temperature, is known as

A.	Dilatometer	B.	Bolometer
C.	Padometer	D.	Tellurometer
E.	None of the above

180.

The Erichsen cupping number of a sheet metal indicates its

A.	Toughness	B.	Surface roughness
C.	Hardness	D.	Ductility
E.	Drawing quality