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121.

The strain energy stored in a specimen when strained within elastic limit is known as

A.	Proof strain energy	B.	Strain energy
C.	Elastic limit strain energy	D.	Resilience
E.	None of the above

122.

The ratio of hoop stress to longitudinal stress for thin spherical shells is

A.	2
C.	0
E.	There is no such ratio for spherical shells

123.

The safe working pressure for a spherical vessel 1.5 m diameter and 1.5 cm wall thickness with limiting tensile stress of 450 kg/cm2 would be

A.	4.5 km/cm3	B.	9 kg/cm2
C.	18 kg/cm2	D.	36 kg/cm2
E.	45 kg/cm2

124.

A seamless water main 1 metre in diameter is required to carry wter under a head of 100 metres. If the maximum permissible tensile stress in the metal is 500 kg/cm2, the thickness of metal required would be

A.	1 mm	B.	5 mm
C.	10 mm	D.	15 mm
E.	25 mm

125.

In case of thin cylindrical shell with hemispherical ends

A.	The thickness of cylindrical is more than that of spherical ends	B.	The thickness of cylinderical shell is less than that of spherical ends
C.	The thickness of cylindrical is same as that of spherical ends	D.	The thickness of cylindrical shell is double of the thickness of spherical shell
E.	None of the above

126.

A cylindrical section having no joint is known as

A.	Perfect section	B.	Jointless section
C.	Seamless section	D.	Strong section
E.	Stress free section

127.

A thin cylinder contains fluid at a pressure of 30 kg/cm2, the inside diameter of the shell is 60 cm and the tensile stress in the material is to be limited to 900 kg/cm2. The shell must have minimum wall thickness of

A.	1 mm	B.	2.7 mm
C.	9 mm	D.	10 mm
E.	1000 mm

128.

In case of a circular shaft subjected to torque the value of shear stress

A.	Is uniform throughout	B.	Has maximum value at the axis
C.	Has maximum value at the surface	D.	Varies linearly from axis to surface
E.	Is zero at the axis and linearly increases to a maximum value at the surface of the shaft

129.

Torsional rigidity is

A.	The torque that produces rotation of unit r.p.m. in a shaft	B.	The torque that transmits one HP at one r.p.m.
C.	The torque that produces a twist of one radian in a shaft of unit diameter	D.	The torque that produces a twist of one radian in a shaft of unit length
E.	None of the above

130.

A solid steel shaft of 100 mm diameter transmits 100 HP at (450/?) r.p.m. The torque in kg-m on the shaft would be

A.	250	B.	500
C.	750	D.	1000
E.	5000