Top 150+ Solved Design of Machine Elements MCQ Questions Answer
Q. In which of the following bonding theory, water molecules break down to form H+ and OH- ions?
a. electrostatic bonding theory
b. hot strength theory
c. surface tension theory
d. block and wedge theory
Q. What does the clay particle absorb in electrostatic bonding theory?
a. complete water
b. h+ ions
c. oh–ions
d. sand grains
Q. For bonding action of clays, what is the amount of water needed?
a. 1.5%-8%
b. 3.5%-11%
c. 4.5%-12%
d. 5.5%-13%
Q. What is the amount of sea coal needed in cast irons for small casting moulding sands?
a. 1%
b. 2%
c. 3%
d. 4%
Q. What is the amount of sea coal needed in cast irons for large green casting moulding sands?
a. 10%
b. 15%
c. 20%
d. 25%
Q. Which of the following increases the dry strength of the sand?
a. iron oxides
b. fuel oils
c. cereals
d. dextrin and molasses
Q. Modulus of resilience is defined as
a. strain energy per unit volume
b. strain energy per unit area
c. independent of strain energy
d. none of the mentioned
Q. Zerol gears give lesser contact ratio.
a. true
b. no, larger contact ratio
c. zero contact
d. none of the listed
Q. 1816mm and radius of centroidal axis is 100mm, then find the bending stress at inner fibre whose radius is 50mm. Area of cross section of beam is 7200mm² and the beam is loaded with 100kN of load.
a. 97.3
b. 95.8
c. 100.6
d. none of the mentioned
Q. A curved beam with eccentricity 0.02D is loaded with 1kN.Centroidal radius=4D and inner and outer radii are 3.5D and 4.5D respectively. Area of cross section is 0.8D². Find the dimension D if allowable stress is 110N/mm² and considering only direct tensile stress.
a. 4.7mm
b. 6.8mm
c. 13.95mm
d. 3.4mm
Q. Due to the centrifugal force acting on the rim, the flywheel arms will be subjected to
a. tensile stress
b. compressive stress
c. shear stress
d. none of the mentioned
Q. The cross-section of the flywheel arms is usually
a. elliptical
b. rectangular
c. i-section
d. l-section
Q. In order to find the maximum bending moment on the arms, it is assumed as a
a. simply supported beam carrying a uniformly distributed load over the arm
b. fixed at both ends
c. cantilever beam fixed at the hub and carrying a concentrated load at the free end of the rim
d. none of the mentioned