Mechanical Engineering : Machine Design QUESTIONS AND ANSWERS :: part3 : 16 to 20
Following Mechanical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :
16.A key made from a cylindrical disc having segmental cross-section, is known as |
| wood-ruff key |
| feather key |
| flat saddle key |
| gib head key |
| hollow saddle key. |
17.Jam 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 a 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 splitted and bent in reverse direction at other end |
| none of the above. |
18.A tapered key which fits in a keyway in the hub and is flat on the shaft, is known as |
| wood-ruff key |
| feather key |
| flat saddle key |
| gib head key |
| hollow saddle key. |
19.Buttress threads are usually found on |
| screw cutting lathes |
| feed mechanisms |
| spindles of bench vices |
| screw jack |
| railway carriage couplings. |
20.Which of the following is a permanent fastening ? |
| bolts |
| keys |
| cotters |
| rivets |
| screws. |
More Machine Design QUESTIONS AND ANSWERS available in next pages
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