Top 550+ Solved Machine Design MCQ Questions Answer
Q. Manganese in steel increases its
a. Hardness
b. Ductility and Malleability
c. Tensile strength
d. Brittleness
e. Increasing the diameter of threaded portion
Q. The diameter of a washer is generally
a. Equal to the diameter of bolt
b. Slightly less than the diameter of the bolt
c. Slight more than the diameter of the bolt
d. Of any size that suits the application
e. None of the above
Q. If a square key and the shaft are to be of the same material and of equal strength, the length of key would be (d = dia. Of shaft)
a. 1.23 d
b. 1.50 d
c. 2 d
d. d
e. 0.75 d
Q. The segmental bottom of a circular tank is subjected to
a. hoop tension
b. hoop compression
c. bending moment
d. none of the above
e. Increasing the diameter of threaded portion
Q. The plastic design of steel structures which is based on the statical method of plastic analysis is
a. independent of safety
b. gegas no indication of safety
c. Increasing the diameter of threaded portion
d. Safe
e. Unsafe
Q. Which is the variable stress
a. Fluctuating
b. Reversed
c. Repeated
d. Alternating
e. All of the above
Q. Which of the following bearings will have least coefficient of friction?
a. Tapered bearing
b. Self-aligning bearing
c. Cylinder roller bearing
d. Thrust ball bearing
e. Single ball bearing
Q. A stud has
a. Counter shunk head
b. Allen head
c. Slotted head
d. Cylindrical head
e. Both ends threaded
Q. The selection of material for gears depends on
a. Peripheral speed
b. Type of service
c. Required dimensions and weight of the drive
d. Shock and wear resistance
e. All of the above
Q. When large quantities of bolts are to be purchased the quantity is usually specified in terms of
a. Number
b. Volume
c. Packets
d. Weight
e. None of the above
Q. Both Soderberg and Gerber criteria for failure theories are overly conservative
a. near the middle of the curves
b. near the right end of the curves
c. Increasing the diameter of threaded portion
d. near the left end of the curves
e. near the left as well as right ends of the curve
Q. Which of the following statement is incorrect?
a. For columns, the solid round bar is less economical than the turbular section
b. The radius of gyration for the tubular section in all directions remains the same
c. A tubular section is most economical for the column free to buckle in any direction
d. none of the above
e. Increasing the diameter of threaded portion
Q. Coriolis component of acceleration is encountered in
a. Lower pair
b. Higher pair
c. Whit worth-quick-return motion
d. Four bar mechanism
e. Mechanism of steam engine
Q. Large sections usually have a somewhat lower permissible stress than small sections. This is due to
a. less homogeneity of structure of material
b. larger residual stress
c. greater probability of structural flaws
d. All of the above
e. Increasing the diameter of threaded portion