Related Questions

A locking device in which the bottom cylindrical portion is recessed to receive the tip of the locking set screw, is called
A Ring nut
B Castle nut
C Sawn nut
D Jam nut
Sohana's mathematics test had 75 problems i.e. 10 arithmetic, 30 algebra and 35 geometry problems each carrying I mark She answered 70% of the arithmetic, 40% of the algebra and 60% of the geometry problems correctly. She did not pass the test as she got less than 60% marks. How many more questions she would have needed to answer correctly to earn a 60% passing grade?
A 5
B 10
C 15
D 20
(b) Change the narration of the following : (i) " You know it isn't safe to go to bed without locking the door", he said to his son.
A He said to his son whether he (son) knew the safety to go to bed without locking the door.
Elastic nut is a locking device in which
A One small 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 a screw
C Hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is stewed on the bolt causing a 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 other end
Jam 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 a 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 a 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 spitted and bent in reverse direction at other end
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 a 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
Castle 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 is middle of nut and then slot reduced by tightening a 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 a 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 spitted and bent in reverse direction at other end
Locking
A Initiated by quadriceps femoris muscle
B Anterior cruciate ligament is taut
C Rectus femoris is relaxed
D By popliteus muscle
E Occurs during hyperextension
In order to ensure self locking in a screw jack, it is essential that helix angle is __________ friction angle.
A Larger than
B Smaller than
C Equal to
D None of these
A screw will be self locking, if
A Friction angle is less than helix angle
B Friction angle is more than helix angle
C Friction angle is equal to helix angle
D Efficiency of screw is 100%

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