Engineering :: Strength Of Materials

@ : Home > Mechanical Engineering > Strength Of Materials

241.

The modulus of resilience in tension is nearly

A.	65 kJ/m3	B.	130 kJ/m3
C.	210 kJ/m3	D.	260 kJ/m3

242.

The modulus of resilience in shear is nearly

A.	380 kJ/m3	B.	260 kJ/m3
C.	150 kJ/m3	D.	95 kJ/m3

243.

The state of pure shear stress is produced by

A.	equal tension in two directions at right angles	B.	equal compression in two-directions at right angle
C.	tension in one direction and equal compression in perpendicular direction	D.	a moment and couple in opposite directions

244.

The rod of a ceiling fan is subjected to

A.	compressive stress	B.	tensile stress
C.	shear stress	D.	torsional stress

245.

Highest factor of safety is usually taken for

A.	dead	B.	live load
C.	shock load

246.

The rate of change of bending moment is equal to

A.	Shear force	B.	Deflection
C.	Slope	D.	Poisson's ratio x deflection

247.

A brittle steel rod is heated to 160?C and then suddenly clamped at both ends. It is then allowed to cool and breaks at a temperature of 85?C. If E = 200 GN/m2 and ? = 12 x 10-5 / ?C, the breaking stress of steel is

A.	60 MN / m2	B.	90 MN / m2
C.	180 MN / m2	D.	360 MN / m2

248.

The maximum bending moment due to a moving load on a fixed ended beam occurs

A.	under the load only	B.	at mid span
C.	anywhere along the span	D.	at a support

249.

The heaviest I section for the same depth is

A.	ISMB	B.	ISLB
C.	ISHB	D.	ISWB

250.

A copper rod 15 mm diameter 0.8 m long is heated through 50?C. The expansion of the rod is prevented by gripping it at both ends. When the grips do not yield, the stress in rod is 115 N/mm2 and forces applied at the grips are 20 kN. In case one of the grip yields by 0.5 mm

A.	the rod will be under tension	B.	the force at grips will be increase
C.	the compressive stress in the rod will increase	D.	the compressive stress in the rod will reduce