Mechanical Engineering : Machine Design QUESTIONS AND ANSWERS :: part4 : 21 to 25
Following Mechanical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :
21.Split nut is a locking device in which |
| one smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming |
| a slot is cut partly in middle of nut and then slot reduced by tightening screw |
| 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 |
| 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 |
| none of the above. |
22.A bench vice has following type of threads |
| metric |
| square |
| buttress |
| acme |
| BSW. |
23.For tight leakage joints, following type of thread is best suited |
| metric |
| buttress |
| square |
| acme |
| NPT (national pipe threads). |
24.Form coefficient of spring is |
| ratio of coil diameter to wire diameter |
| load required to produce unit deflection |
| its capability of storing energy |
| concerned With strength of wire of spring |
| nothing |
25.Gear box is used |
| to produce torque |
| for speed reduction |
| to obtain variable speeds |
| to increase efficiency of system |
| to damp out vibrations. |
More Machine Design QUESTIONS AND ANSWERS available in next pages
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