Top 550+ Solved Machine Design MCQ Questions Answer
Q. A steel that has been deoxidized with a strong de-oxidizing agent, such as Silicon or Aluminium in order to eliminate a reaction between C and O2 during solidification, is known as
a. Soft steel
b. Kolled steel
c. De-oxidised steel
d. Oxidised steel
e. Anodised steel
Q. Shear strain energy theory of the failure of a material at elastic limit is due to
a. Rankine
b. Increasing the diameter of threaded portion
c. Haig
d. St. Venant
e. Von Mises
Q. The cam used for high speed engines is
a. Cycloidal
b. Involute
c. Flat
d. Uniform acceleration
e. Tangent
Q. The Euler's formula for columns is valid for
a. Increasing the diameter of threaded portion
b. large slenderness ratio
c. all slenderness ratios
d. zero slendemess ratio
e. small slenderness ratio
Q. The ratio of maximum shear stress to average shear stress for a circular section is
a. 4
b. 1?4
c. 2
d. 3?4
e. 4?3
Q. Which of the following is used as bearing lines
a. Brass
b. Cast iron
c. Babbit metal
d. Cast steel
e. Aluminium
Q. A bushed pin flexible type coupling is used to join two shafts which
a. Are not in exact alignment
b. Are not coplanar
c. Change position during operation
d. Are inclined
e. None of the above
Q. For a circular section the ratio of the plastic moment capacity to the yield moment capacity is
a. 1.44
b. 1.1
c. Increasing the diameter of threaded portion
d. 1.86
e. 1.7
Q. Snap head rivets are used in
a. Structural work
b. Ship building
c. Aircraft body
d. Any of the above
e. None of the above
Q. In oilless bearings
a. There is no external supply of lubricant
b. The lubrication is achieved by adding sulid lubricants
c. Grease is used for lubrication
d. Graphite is used for lubrication
e. None of the above
Q. Maximum principal stress theory is applicable for
a. Elastic materials
b. Plastic materials
c. Ductile materials
d. Brittle materials
e. None of the above
Q. On a triple thread screw
a. Lead = 2 x pitch
b. Lead = 3 x pitch
c. Lead = pitch
d. Pitch = 3 x lead
e. Pitch = 2 x lead
Q. A pair of straight tooth bevel gears connects a pair of shafts at 90?. The velocity ratio is 3:1. The cone ptich angle of the pinion will be
a. 22.5?
b. 71.6?
c. 30?
d. 18.4?
e. 60?
Q. Key normally used in wrist watch is
a. Kenned key
b. Sunk key
c. Tangent key
d. Woodruff key
e. None of the above
Q. Cap screws are
a. Unsed in furniture work only
b. Used on sheet metal work only and are generally self-threading type
c. Used by welding to the structure for relative location of parts
d. Similar to small size bolts except that a great variety of shades of heads are available
e. Generally nickel plated and used where external show is important