Top 550+ Solved Machine Design MCQ Questions Answer
Q. Gerber line for failure criteria is in the form of a
a. parabola
b. Increasing the diameter of threaded portion
c. straight line with negative slope
d. straight line with positive slope
e. hyperbola
Q. Which of the following formula for columns takes into account any initial crookedness of the column and imperfectness of axial loading?
a. Secant formula
b. Increasing the diameter of threaded portion
c. Euler's formula
d. Rankiness formula
e. Perry Robertson formula
Q. While designing a shaft pulley and key for a system
a. Shaft is the weakest member
b. Pulley is the weakest member
c. Key is the weakest member
d. All are designed for equal strength
e. None of the above
Q. For a bearing which of the following is maximum?
a. Minimum life
b. Average life
c. Median life
d. (A), (B) and (C) above are identical
e. Increasing the diameter of threaded portion
Q. The approximate value of allowable stress for carbon steel under static loading (in kg/cm2) is
a. 500-1000
b. 10000-15000
c. 4000-7500
d. 20000-25000
e. 15000-20000
Q. Stub tooth is
a. Longer than standard tooth depth
b. Non-standard tooth
c. Shorter than standard tooth depth
d. Equivalent rack tooth
e. Standard gear tooth
Q. Self-tapping screws are generally used in
a. Shear metal work
b. Machine tools
c. Automobiles
d. Aeroplanes
e. None of the above
Q. Fatigue is mostly initiated at
a. core
b. centre
c. Increasing the diameter of threaded portion
d. surface
e. core
Q. Which of the following joint is used for pipes carrying water under low pressures?
a. Socket joint
b. Increasing the diameter of threaded portion
c. Expansion joint
d. Adhesive joint
e. Welded joint
Q. In case of steels, as the percentage of carbon content increases
a. Elongation increases
b. Chrome steel
c. Hardness decreases
d. Tensile strength increases
e. Weldability increases
Q. If screw threads are to be used in a situation involving high stresses in one direction only, the types of threads suitable for this would be
a. BA
b. BSW
c. Buttress
d. Acme
e. Square
Q. A solderberg line for ductile material gives upper limit for
a. Increasing the diameter of threaded portion
b. alternating tensile stress
c. alternating compressive stress
d. any combination of mean and alternating stresses
e. mean stress
Q. If water in closed pipe freezes, the pipe will
a. Rupture in a plane inclined at 45 degree to the longitudinal axis of the pipe
b. Rupture along a line running longitudinally along the pipe
c. Rupture along a plane perpendicular to the axis of pipe
d. Rupture zig-zag along the length
e. Rupture along weakest circumferential section