In V-belt drive, belt touches______________?
(A) at bottom
(B) at sides only
(C) both at bottom and sides
(D) could touch anywhere
(D) none of the above
In cross or regular lay ropes_________________?
(A) direction of twist of wires in strands is opposite to the direction of twist of strands
(B) direction of twist of wires and strands are same
(C) wires in two adjacent strands are twisted in opposite direction
(D) wires are not twisted
(D) none of the above
If shearing stress in nut is half the tensile stress in a bolt, then nut length should be equal to___________________?
(A) diameter of bolt
(B) 0.75 x diameter of bolt
(C) 1.25 x diameter of bolt
(D) 1.5 x diameter of bolt
(D) 0.5 x diameter of bolt
Basic hole is one_________________?
(A) whose upper deviation is zero
(B) whose lower deviation is zero
(C) whose lower as well as upper deviations are zero
(D) does not exist
(D) none of the above
For standard coarse threads of nut, the threads will be as strong in failure by shear as the bolt in tension, if the height of nut (h) is approximately________________?
(A) 0.4 times
(B) 0.6 times
(C) 0.7 times
(D) 0.8 times
(D) 0.9 times the normal diameter of bolt
When a bolt is subjected to shock loading, the resilience of the bolt should be considered in order to prevent breakage at_______________?
(A) shank
(B) head
(C) in the middle
(D) at the thread
(D) anywhere in the bolt
The connecting rod bolts are tightened up with initial tension greater than the external load so that___________________?
(A) joint may not open up
(B) bolts are weakest elements
(C) the resultant load on the bolt would not be affected by the external cyclic load
(D) bolts will not loosen during service
(D) none of the above
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 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 pin spitted and bent in reverse direction at other end
(D) none of the above.
Gear box is used___________________?
(A) to produce torque
(B) for speed reduction
(C) to obtain variable speeds
(D) to increase efficiency of system
(D) to damp out vibrations
The piston rod of a steam engine is usually connected to the cross head by means of__________________?
(A) bolted joint
(B) kunckle joint
(C) cotter joint
(D) universal joint
(D) universal coupling