Mechanical Engineering Mcqs

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
  • (E)  none of the above
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
  • (E)  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
  • (E)  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
  • (E)  to damp out vibrations