Top 550+ Solved Machine Design MCQ Questions Answer
Q. According to Indian Boiler Regulations the essential requirement of any safety valve is that
a. It should be costly
b. It should have good appearance
c. Its area should be sufficient to discharge the steam as quickly as it is generated with rise in pressure not more than 10% of the safety valve blow off pressure
d. It should be located outside the boiler room
e. It should be visible to boiler operator from all positions in the boiler room
Q. Which of the following material is not suitable for impact loads?
a. Cast iron
b. Chrome steel
c. Mild steel
d. High carbon steel
e. Manganese steel
Q. The fatigue limit of a material
a. Is greatly decreased by poor surface conditions
b. Is improved if there is rough surface
c. Is independent of surface conditions
d. Surface defects which extend upto core have no influence of fatigue limits
e. None of the above
Q. The material of a flt spiral spring is in a state of
a. pure torsion
b. pure bending
c. torsion and bending
d. none of the above
e. Cast steel
Q. Safety valve used on locomotive boilers is generally of
a. Spring balanced type
b. Lever load type
c. Spring type
d. Indirect dead weight type
e. Dead weight type
Q. The limit design of steel structures makes use of
a. elastic and plastic analysis of structures
b. ultimate analysis
c. Increasing the diameter of threaded portion
d. plastic analysis of structures
e. elastic analysis of structures
Q. Gas lubricated bearings are used for
a. very high rpm and high load applications
b. very low rpm and high load applications
c. very low rpm and low load applications
d. Increasing the diameter of threaded portion
e. very high rpm and low load applications
Q. In a ball bearing a ball is subjected to
a. Compressive stress
b. Tensile stress
c. Shear stress
d. Cyclic stress or fatigue
e. None of the above
Q. Backlash is
a. Sum of the clearance of two gears
b. Mutual play between two gears
c. The amount by which the width of a tooth space exceeds the thickness of the engaging tooth on pitch circle
d. Any of the above
e. None of the above
Q. A cantilever beam of square section is subjected to a load W at the free end. If the length of the beam is increased and load reduced to half the deflection at the free end as compared to original deflection would be
a. 4 times
b. 16 times
c. 1/2 times
d. 2 times
e. 8 times
Q. Forced vibrations
a. Are preceded by free vibrations
b. Are followed by free vibrations
c. Have a frequency more than the natural frequency
d. Are independent of natural frequency
e. None of the above
Q. Bearings provided on passenger coaches in railway are
a. Bush bearings
b. Cast iron bearings
c. Ball bearings
d. Roller bearings
e. Any of the above
Q. A coarse scres of major diameter 6 mm is designated as
a. 6 M x 6 x 1
b. M 6
c. 6 M x 1
d. 1 x 6 M
e. Coarse M 6
Q. A reinforced concrete beam is considered as made of
a. Homogeneous material
b. Composite material
c. Clad material
d. Isotropic material
e. Heterogeneous material
Q. In concrete mixer, the bevel gears for rotating the drum are generally
a. Shaped
b. Forged
c. Hobbed
d. Precisely machined
e. Casted