Question: Applications in which stresses are encountered in one direction only uses following type of threads____________________?

• 1. metric
• 2. buttress
• 3. acme
• 4. square

Question: If threads on a bolt are left hand, threads on nut will be_____________________?

• 1. right hand with same pitch
• 2. left hand with same pitch
• 3. could be left or right hand
• 4. right hand with fine pitch

Question: Elastic nut is a locking device in which__________________?

• 1. one small nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
• 2. a slot is cut partly in middle of nut and then slot reduced by tightening a screw
• 3. hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is stewed on the bolt causing a tight grip
• 4. 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

Question: Turn buckle has____________________?

• 1. right hand threads on bout ends
• 2. left hand threads on both ends
• 3. left hand threads on one end and right hand threads on other end
• 4. no threads

Question: A tapered key which fits in a keyway in the hub and is flat on the shaft, is known as___________________?

• 1. wood-ruff key
• 2. feather key
• 3. flat saddle key
• 4. gib head key

Question: A key capable of tilting in a recess milled out in a shaft is known as______________________?

• 1. wood-ruff key
• 2. feather key
• 3. flat saddle key
• 4. gib head key

Question: Buttress threads are usually found on____________________?

• 1. screw cutting lathes
• 2. feed mechanisms
• 3. spindles of bench vices
• 4. railway carriage couplings

Question: Jam nut is a locking device in which _____________________?

• 1. one smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
• 2. a slot is cut partly in middle of nut and then slot reduced by tightening a screw
• 3. a hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip
• 4. 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

Question: If the tearing efficiency of a riveted joint is 75%, then the ratio of diameter of rivet to the pitch is equal to___________________?

• 1. 0.2
• 2. 0.25
• 3. 0.50
• 4. 0.6

Question: Which of the following is a permanent fastening ?

• 1. bolts
• 2. keys
• 3. cotters
• 4. rivets