Top 550+ Solved Machine Design MCQ Questions Answer
Q. The 'crowning' of flat pulleys is generally done
a. To rduce the belt friction
b. To prevent belt joint from damaging the belt surface
c. To prevent the belt from running off the pulley
d. In case of cross belt drives only
e. None of the above
Q. Piston rings are usually made of
a. Stainless steel
b. Cast iron
c. Increasing the diameter of threaded portion
d. Aluminium
e. High carban steel
Q. The main difference between rigid and flexible coupling for shafts transmitting power is
a. the number of coupling bolts are more in flexible coupling than in rigid coupling
b. a flexible element is inserted around coupling bolts in one of the flanges
c. There is a protective flange over bolts in the case of flexible coupling
d. none of the above
e. Cast steel
Q. Teflon is used for bearings
a. When low coefficient of friction is desired
b. Heat dissipation is a problem
c. Space is the major consideration
d. Increasing the diameter of threaded portion
e. When bearings operate at very high rpm
Q. In case of a Saddle key
a. The key is welded to shaft
b. The key way is cut in shaft only
c. The key ways is cut in hub only
d. The key way is cut in both shaft and hub
e. The key is made of flexible material
Q. For determination of allowable stress in axial compression, IS : 800-1962 has adopted
a. Euler's formula
b. Secant formula
c. Increasing the diameter of threaded portion
d. Perry Robertson formula
e. Rankines formula
Q. Braking system on earth moving machinery is
a. Vacuum braking
b. Pneumatic braking
c. Hydraulic braking
d. Regenerative braking
e. Mechanical braking
Q. In a butt welded joint, the size of weld is
a. 0.5 times the throat of weld
b. double the throat of weld
c. Increasing the diameter of threaded portion
d. equal to the throat of weld
Q. The shape factor of an isosceles triangle for bending about the axis parallel to the base is
a. 2.74
b. Increasing the diameter of threaded portion
c. 2.34
d. 1.44
e. 1.74
Q. A pivoted segment type thrust bearing is used in order to provide
a. Uniform wear
b. A converging film of oil
c. Balanced lead
d. Uniform frictional forces
e. Uniform velocity
Q. The pitch of threads on a lock-nut is
a. Fine
b. Very fine
c. Coarse
d. Same as that of nut
e. None of the above
Q. Aircraft body is
a. Welded structure
b. Riveted structure
c. Cast structure
d. Precast structure
e. None of the above
Q. The weakest plane in a fillet weld is
a. the throat
b. smaller of the sides
c. side normal to the force
d. side parallel to the force
e. Increasing the diameter of threaded portion
Q. The holes in plates for reveting are usually made by
a. Arc cutting
b. Oxyacetylene flame
c. Punching
d. Drilling
e. Any of the above
Q. Which of the following treatment is often recommended for parts operating under corrosive conditions?
a. strain-aging
b. tempering
c. normalising
d. all of the above
e. Increasing the diameter of threaded portion