Top 550+ Solved Machine Design MCQ Questions Answer
Q. A material is generally classified as brittle if the percentage elongation (in a gauge length of 50 mm) is less than
a. Chrome steel
b. 1%
c. 2%
d. 5%
e. 15%
Q. A flange coupling is
a. Used for non-collinear shafts
b. Used for collinear shafts
c. Flexible
d. Used only on small shafts rotating at slow speeds
e. None of the above
Q. Splines are used when
a. Axial relative motion between shaft and hub is necessary
b. The torque is high
c. The power to be transmitted is high
d. rpm are high
e. The power to be transmitted is low
Q. Bolts in structures are often tightened upto or beyond the yield point because
a. frction is more beyond yield point thus providing a firm joint
b. temperature variations may loosen the joint
c. it improves endurance strength
d. all of the above
e. Increasing the diameter of threaded portion
Q. A triple threaded worm has a pitch diameter of 100 mm and an axial pitch of 22 mm. The lead angle will be
a. tan-1 0.21
b. tan-1 0.66
c. tan-1 0.22
d. tan-1 0.3
e. tan-1 0.36
Q. Spigot and socket joints are used on pipes
a. Which are buried underground
b. Carrying air at pressure above atmospheric pressure
c. Carrying steam under high pressure
d. Carrying high pressure fluids under high pressure
e. Carrying air at pressure below atmospheric pressure
Q. In a compression test the fracture in cast iron specimen would occur along
a. An oblique plane
b. Along the axis of the load
c. At right angles to the specimen axis
d. Fracture will not occur in cast iron
e. None of the above
Q. If the allowable shear stress is 960 kg/sq. cm for the size h cm, the allowable force per cm of weld length would be
a. 670 h
b. 475 h
c. 315 h
d. 400 h
e. 950 h
Q. In case of a knuckle joint the pin is likely to fail in
a. Tension
b. Crushing
c. Double shear
d. Compression
e. Shear
Q. Shot peening leaves the material surface in
a. residual tensile stress
b. residual shear stress
c. residual compressive stress
d. All of the above
e. Increasing the diameter of threaded portion
Q. A Babbit is
a. A gadget for measuring volume
b. A measure of magnetic induction produced in a material
c. A eutectic of iron and iron phosphide
d. None of these
e. Antimony bearing lead or tin alloy
Q. Low pressure angle on gears results in
a. Weaker teeth
b. stronger teeth
c. abrasive wear
d. none of the above
e. Cast steel
Q. An eye bolt is generally provided on
a. Furnaces
b. Bench vices
c. Electric motors
d. Overhead cranes
e. All of the above
Q. The satisfactory method of reclaiming worn out and under sized part subject to fatigue loads is
a. Repainting
b. Polishing
c. Electroplating
d. Recasting
e. None of the above
Q. The usual clearance provided in hydrodynamic bearing per mm of diameter of shaft is
a. 1 micron
b. 10 micron
c. 0.01 micron
d. 0.1 micron
e. 100 micron