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171.

A kinematic chain becomes a mechanism when

A.	First link is fixed	B.	Any one link is fixed
C.	All link are fixed	D.	None of the links are fixed
E.	There is no such criterion

172.

A sphere of mass 100 kg moving at 10 m/s overtakes and collides with another sphere of mass 50 kg moving at 3 m/s in the same direction. If the impact is inelastic the velocity of of two masses after impact will be

A.	Zero	B.	4.17 m/s
C.	6.67 m/s	D.	8.33 m/s
E.	13.3 m/s

173.

A sphere of mass 100 kg moving at 10 m/s overtakes and collides with another sphere of mass 50 kg moving at 3 m/s in the same direction. If the impact is perfectly elastic, the velocity of two masses after impact will be

A.	Zero	B.	2 m/s
C.	3.33 m/s	D.	6.67 m/s
E.	8.33 m/s

174.

A body having an initial velocity of 10 m/s moves 200 mm in 5 sec when a force of 20 kgf is applied to it. If the acceleration due to gravity is 9 m/s2 the weight of the body should be

A.	11 kg	B.	15 kg
C.	16.5 kg	D.	18.35 kg
E.	18.65 kg

175.

In case of solid friction, when tan ? =

A.	The body A will move over the surface B irrespective of the magnitude of the force F applied on the body	B.	No motion of body A on surface B is possible, irrespective of how large the magnitude of force F applied on the body may be
C.	tan ? can never be equal to	D.	tan ? can be equal to
E.	tan ? can be equal to

176.

Tan ? can be greater than

A.	Highly rough surfaces	B.	Rough surfaces
C.	Smooth surfaces	D.	Polished surfaces
E.	Tan ? can never be greater than

177.

Creep in belts is due to

A.	Elasticity of belt material	B.	Plasticity of belt material
C.	Elongation of belt due to tension	D.	Differential elougation of belt due to difference in tension on two sides of a pulley
E.	Plastic deformation of belt material due to constant use

178.

Which of the following is not a common section of V-belts

A.	B	B.	C
C.	D	D.	E
E.	F

179.

Slip in turning belt is

A.	Zero	B.	Always restricted to 1 percent
C.	Less than 5%	D.	Maximum permissible
E.	Depends on the belt material

180.

Froude's dynamometer is

A.	Transmission type of dynamometer	B.	Mechanical friction type dynamometer
C.	Fan type dynamometer	D.	Vortex type hydraulic dynamometer
E.	Torsion dynamometer