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191.

The forsional rigidity of a shaft is given by

A.	T / J	B.	T / ?
C.	T / r	D.	T / G

192.

When a shaft is subjected to torsion, the shear stress induced in the shaft varies from

A.	manimum at the centre to maximum at the circumference	B.	maximum at the centre to minimum at the circumference
C.	zero at the centre to maximum at the circumference	D.	maximum at the centre of zero at the circumference

193.

The torsional regidity of a shaft is expressed by the torque required to produce a twist of one radian per unit length of a shaft.

True

False

194.

For a shaft, the shear stress at a point is

A.	equal to	B.	directly proportional to
C.	inversely proportional to

195.

Two solid shafts 'A' and 'B' are made of the same material. The shaft 'A' is of 50 mm diameter and shaft 'B' is of 100 mm diameter. The strength of shaft 'B' is

A.	one-half	B.	double
C.	four times	D.	eight times

196.

Two shafts 'A' and 'B' transmit the same power. The speed of shaft 'A' is 250 r.p.m. and that of shaft 'B' is 300 r.p.m. The shaft 'B' has the greater diameter.

True

False

197.

Two shafts 'A' and 'B' have the same material. The shaft 'A' is solid of diameter 100 mm. The shaft 'B' is hollow with outer diameter 100 mm and inner diameter 50 mm. The torque transmitted by shaft 'B' is

A.	1 ? 6	B.	1 ? 8
C.	1 ? 4	D.	15 ? 16

198.

The strength of the shaft is judged by the torque transmitted by the shaft.

Yes

199.

Two shafts 'A' and 'B' are made of same material. The shaft 'A' is solid and has diameter D. The shaft 'B' is hollow with outer diameter D and inner diameter D / 2. The strength of hollow shaft in torsion is

A.	1 ? 16	B.	1 ? 8
C.	1 ? 4	D.	15 ? 16

200.

Two shafts 'A' and 'B' are made of same material. The shaft 'A' is of diameter D and shaft 'B' is of diameter D / 2. The strength of shaft 'B' is

A.	one-eight	B.	one-fourth
C.	one-half	D.	four times