Rivets are generally specified by_______________?
(A) thickness of plates to be riveted
(B) length of rivet
(C) diameter of head
(D) nominal diameter
(D) all of the above
Which of the following is a permanent fastening ?
(A) bolts
(B) keys
(C) cotters
(D) rivets
(D) screws
If the tearing efficiency of a riveted joint is 75%, then the ratio of diameter of rivet to the pitch is equal to___________________?
(A) 0.2
(B) 0.25
(C) 0.50
(D) 0.6
(D) 0.75
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 fiber 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
(D) none of the above
Buttress threads are usually found on____________________?
(A) screw cutting lathes
(B) feed mechanisms
(C) spindles of bench vices
(D) screw jack
(D) railway carriage couplings
A key capable of tilting in a recess milled out in a shaft is known as______________________?
(A) wood-ruff key
(B) feather key
(C) flat saddle key
(D) gib head key
(D) hollow saddle key
A tapered key which fits in a keyway in the hub and is flat on the shaft, is known as___________________?
(A) wood-ruff key
(B) feather key
(C) flat saddle key
(D) gib head key
(D) hollow saddle key
The inlet value of a four stroke cycle I.C engine remains open for nearly___________________?
(A) 180°
(B) 125°
(C) 235°
(D) 200°
(D) 275°
The specific fuel consumption per BH hour for a petrol engine is approximately__________________?
(A) 0.15 kg
(B) 0.2 kg
(C) 0.25 kg
(D) 0.3kg
(D) 0.35 kg
Crankcase explosion in I.C. engines usuall occurs as ___________________?
(A) first a mild explosion followed by a bi explosion
(B) first a big explosion followed by a mil explosion
(C) both mild and big explosions occi simultaneously
(D) never occurs
(D) unpredictable