Top 550+ Solved Machine Design MCQ Questions Answer
Q. Which process will improve the fatigue life of a part?
a. Electrocoating
b. Chemical coating
c. Shot peening
d. Polishing
e. Electroplating
Q. Addendum is
a. The depth of a gear tooth
b. Half the depth of a gear tooth
c. Depth of tooth space below the pitch circle
d. Height by which tooth projects beyond the pitch circle
e. None of the above
Q. Commonly adopted material for rivets in
a. Mild steel
b. Cast iron
c. Wrought iron
d. Malleable iron
e. None of the above
Q. When power is to be transmitted by two pulleys of different materials, then design will be based on pulley
a. Having smaller diameter
b. Having larger diameter
c. Having (
d. Having (
e. Any of the above
Q. Two springs having stiffness are in series. The equivalent stiffness would be
a. K
b. K/4
c. 4 K
d. 2 K
e. K/2
Q. In case of ductile materials the theory of elastic failure generally applied is
a. Maximum shear stress theory
b. Maximum principal stress theory
c. Distortion energy theory
d. Maximum strain theory
e. Maximum total strain energy theory
Q. Washer are generally specified by
a. Thickness
b. Outer diameter
c. Central hole diameter
d. Mean diameter
e. (A) and (C) above
Q. A coupling used to connect two perfectly aligned shafts is
a. bush pin coupling
b. Oldham coupling
c. rigid tlange coupling
d. none of the above
e. Cast steel
Q. Full stress reversal normally does not occur in bolted connections due to
a. surface hardness
b. ridges and valleys in the form of threads
c. varying cross-section
d. Increasing the diameter of threaded portion
e. pre-loading during tightening
Q. The frictional horse power loss in a bearing having 25 mm diameter subjected to a load of 200 kg rotating at 600 rpm will be of the order of
a. 2HP
b. 0.05 HP
c. 1 HP
d. 0.5 HP
e. 10 HP
Q. If the Brinell hardness number of a sample of steel is 200, the ultimate tensile strength will be approximately
a. Cannot be determined
b. 70 kgf/mm2
c. 200 kgf/mm2
d. 100 kgf/mm2
e. Silver
Q. Which of the following key is used for light work?
a. Round key
b. Increasing the diameter of threaded portion
c. Tangent key
d. Sunk key
e. Saddle key
Q. For butt welding of two plates, each of which is 300 cm thick, the best process would be
a. Submerged are welding
b. MIG welding
c. TIG welding
d. Gas welding
e. Electro slag welding
Q. The number of possible independency mechanisms, n is determined from the following relationship
a. n = 2 N - r
b. n = 2 N + r
c. Increasing the diameter of threaded portion
d. n = N + r
e. n = N - r
Q. In as steam engine, piston rod is connected to the cross head by
a. flange coupling
b. universal coupling
c. cotter joint
d. knuckle joint
e. Increasing the diameter of threaded portion