78. The valve rod in a steam engine is connected to an eccentric rod by
A.Cotter joint
B.Bolted joint
C.Knuckle joint
D.Universal coupling

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79. Split nut is a locking device in which
A.One smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
B.A slot is cut partly in middle of nut and then slot reduced by tightening screw
C.A hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing-4 tight grip
D.Through slots are made at top and a cotter-pin is passed through these and a hole in the bolt, and cotter pin splitted and bent in reverse direction at the other end

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80. Taper on the cotter and slot is provided
A.On both the sides
B.On one side only
C.On none of the sides
D.May be provided anywhere

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81. The function of cutting oil when threading a pipe is to
A.Provide cooling action
B.Lubricate the dies
C.Help remove chips
D.All of the above

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82. Silver-based solder is used for
A.Flaring
B.Brazing
C.Soft soldering
D.Fusion welding

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83. For tight leakage joints, following type of thread is best suited
A.Metric
B.Acme
C.Square
D.NPT (national pipe threads)

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84. In order to permit the thermal expansion/contraction of tubing, it should be
A.Crimped
B.Honed
C.Flared
D.Bent

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