Top 550+ Solved Machine Design MCQ Questions Answer
Q. For water tight joints such as in boiler the rivets are driven
a. Increasing the diameter of threaded portion
c. either in hot or cold condition
d. in cold condition only
e. in hot condition only
Q. Iniversal coupling is
a. Used for collinear shafts
b. Rigid coupling
c. Type of flange coupling
d. Used for non-collinear shafts
e. None of the above
Q. Ball bearing type screws are generally used
a. In bench vices
b. In screw jacks
c. In earthmoving machinery
d. Steering mechanisms
e. None of the above
Q. The maximum size of the fillet weld that can be made in single pass is
a. 12 mm
b. 3 mm
c. Increasing the diameter of threaded portion
d. 8 mm
e. 6 mm
Q. Friction losses in spur gears may be of the order of
a. 15% to 20%
b. 20% to 30%
c. 5% to 10%
d. 10% to 15%
e. Less than 5%
Q. In a horizontal flat belt drive for power transmission it is customary to use
a. bottom side of the belt as slack side
b. top side of the belt as slack side
c. crossed-belting
d. none of the above
e. Cast steel
Q. Auto frettage is a
a. extra cover provided on seamless pipes to increase their hoop stress
b. a means of inducing favourable residual stresses in pressure vessels
c. Increasing the diameter of threaded portion
d. a heat treatment for pressure vessels subjected to low temperatures
e. surface coating process
Q. Bush bearings
a. Phosphor bronze
b. Aluminium bronze
c. Mild steel
d. White metal alloys
e. None of the above
Q. In a standard coarse thread bolt the stress concentration is maximum at
a. Top surface
b. Pitch circle
c. Root
d. All over the surface
e. Flank
Q. In case of worm and worm-wheel the maximum efficiency is obtained when
a. Worm is driver
b. Worm wheel is driver
c. Either of the worm or worm wheel is a driver
d. Depends on other factors
e. None of the above
Q. When properly made, a butt weld has the strength equal to
a. Double the tensile strength of plates
b. Half the tensile strength of plates
c. Half the compressive strength of plates
d. The strength of the welded plates
e. Double the compressive strength of plates
Q. In case of steels, as the percentage of carbon content increases
a. Percentage elongation decreases
b. Weldability increases
c. Tensile strength decreases
d. Hardness decreases
e. Tapered bearing
Q. At the first critical speed a shaft will
a. Remain straight
b. Bend to the simplest shape possible
c. Bend to maximum permissible depth
d. Bend to the convex form
e. Vibrate producing audible sound
Q. In order to reverse the direction of rotation of a 3-phase induction motor
a. Motor should eb replaced
b. Power factor should be changed
c. Supply voltage should be cut off in one phase
d. Any two phases should be interchanged
e. All the three phases should be interchanged
Q. The basic hole is one which has
a. Upper deviation as zero
b. Lower deviation as zero
c. Lower as well as upper deviation within narrow limits
d. Lower as well as upper deviation are zero
e. None of the above