Top 550+ Solved Machine Design MCQ Questions Answer
Q. The surface endurance limit of gear material is dependent on its
a. Toughness
b. Surface hardness
c. Surface lubrication
d. Elastic strength
e. Coefficient of friction
Q. Yield point in static loading as compared to that in fatigue loading is
a. Depends on composition of material
b. Same
c. Lower
d. Higher
e. Depends on loading rate
Q. Slenderness ratio of the lacing bar for compression member should not exceed
a. 125
b. Increasing the diameter of threaded portion
c. 100
d. 175
e. 145
Q. The value of load factor which accounts for margin of safety in plastic design for gravity loads is about
a. 1.85
b. 2.15
c. Increasing the diameter of threaded portion
d. 1.25
e. 1.55
Q. The purpose of providing multiple collars on a flat collar pivot bearing is to
a. Increase frictional resistance
b. Establish self-substaining bearing condition
c. Distribute the frictional load because of limiting frictional resistance
d. Distribute the axial load becase of limiting bearing pressure on a collar
e. None of the above
Q. Bolted joints often fail in
a. tension only
b. compresson only
c. torsion only
d. Increasing the diameter of threaded portion
e. shear only
Q. A series of continuous spot welds
a. dot matrix
b. Increasing the diameter of threaded portion
c. stitch weld
d. butt weld
e. seam weld
Q. A shaft coupling should
a. hold the two shafts in perfect alignment
b. have no projecting parts
c. have all the above characteristics
d. Cast steel
e. transmit full power of the shaft
Q. Eye bolts are used for
a. Locking devices
b. Transmission of power
c. Absorption of shocks and vibrations
d. Lifting and transporting heavy pieces
e. None of the above
Q. The most common material used for rivets is
a. cast iron
b. malleable cast iron
c. mild steel
d. none of the above
e. Cast steel
Q. Which of the following is a positive drive?
a. Rope drive
b. Flat belt drive
c. Gear drive
d. V-belt drive
e. None of the above
Q. The critical speed of a shaft can be increased by
a. shaft diameter may be increased
b. bearings may be brought closer together
c. Increasing the diameter of threaded portion
d. frictionless bearings be used
e. reciprocating load may be applied
Q. A chain drive is used for
a. Distance is no criteria for such drives
b. Medium distance
c. Long distance
d. Very short distance
e. Short distance
Q. In a tap set, the first tap used in thread cutting is
a. Any one
b. Taper tap
c. Straight tap
d. Bottom tap
e. Plug tap
Q. The pressure angle an involute gear profile gear
a. Changes with position
b. Depends on speed of operation
c. Depends on gear pitch and clearance
d. Remains constant
e. None of the above