Top 550+ Solved Machine Design MCQ Questions Answer
Q. Gantry girders are invariably designed to resist
a. transverse and lateral loads
b. Increasing the diameter of threaded portion
c. transverse, lateral and axial load
d. lateral loads only
e. transverse loads only
Q. The size of the fillet weld is given by
a. throat of the fillet
b. Increasing the diameter of threaded portion
c. smaller size of the plate welded
d. smaller side of the triangle
e. hypotenuse of the triangle
Q. Cast iron bearings are used
a. for reciprocating and oscillating motions only
b. Increasing the diameter of threaded portion
c. when space is the major consideration
d. when cost is the major consideration
e. for under water applications
Q. Splined shafts are most commonly used in
a. aircrafts
b. machine tools
c. automobiles
d. none of the above
e. Cast steel
Q. The deflection of a helical spring is
a. Directly proportional to d3
b. Directly proportional to d3/2
c. Directly proportional to d
d. Directly proportional to d4
e. Directly proportional to d2
Q. The column splice is used to increase
a. strength of the column
b. cross-sectional area of the column
c. length of the column
d. all of the above
e. Increasing the diameter of threaded portion
Q. For which of the following gears noise level is low
a. cast iron gears
b. alloys steel gears
c. non metallic gears
d. none of the above
e. Cast steel
Q. For steel ultimate strength in tension compared to that in shear is
a. 1?2
b. 3?2
c. Same
d. 2?3
e. 2?1
Q. In a ball bearing a sleeve is fixed to
a. To protect bearing against dust etc.
b. Reduce friction
c. Prevent relative axial movement between the shaft and bearing
d. Carry more load
e. Reduce wear
Q. Resilience : Strain energy :
a. Increasing the diameter of threaded portion
b. Velocity : Kinetic energy
c. Bulk modulus : Elasticity
d. Potential energy : Kinetic energy
e. Moment : Momentum
Q. A boiler shell 280 cm diameter and plate thickness 12 mm is subjected to an internal pressure of 1.2 MN/m2. The hoop stress will be
a. 155.5 N/m2
b. 60 N/m2
c. 45 N/m2
d. 135 N/m2
e. 180 N/m2
Q. The amount of energy required upto fracture is known as
a. Fatigue strength
b. Chrome steel
c. Toughness
d. Damping effect
e. Creep strength
Q. Which threads have better fatigue characteristics?
b. Threads cut by taps
c. Threads cut by rolling
d. Increasing the diameter of threaded portion
e. Threads cut on lathe
Q. The minimum thickness of steel members exposed to weather and accessible for paintng is
a. 8 mm
b. 10 mm
c. Increasing the diameter of threaded portion
d. 6 mm
e. 4 mm
Q. In case of automobile body work the type of welding generally used is
a. Arc welding
b. Submerged are welding
c. Spot welding
d. Gas welding
e. Seam welding