Top 550+ Solved Machine Design MCQ Questions Answer
Q. Taper roller bearings are used in automobiles for
a. Differential
b. Engine crankshaft
c. Gear box
d. Small end of connecting rod
e. Wheels
Q. In hydrodynamic bearings
a. The oil film pressure is generated by external pump
b. The oil film pressure is generated by dead weight of shaft
c. The oil film pressure is generated only when the shaft rotates
d. The oil film is sufficiently thick
e. None of the above
Q. Dibasic acid esters have
a. fast evaporation at low temperatures
b. do not wet the metal surface
c. low film strength
d. Increasing the diameter of threaded portion
e. horizontal viscosity-temperature curves
Q. The turbular section of a column has
a. Increasing the diameter of threaded portion
c. low buckling strength
d. negligible buckling strength
e. high buckling strength
Q. The shape factor of standard rolled beam section varies in the range
a. Increasing the diameter of threaded portion
b. 1.0 to 1.1
c. 1.2 to 1.3
d. 1.1 to 1.2
e. 1.3 to 1.4
Q. For maximum horse power transmission in belt drives the velocity of belt left such that the ration tight side driving tension/centrifugal tension is
a. 1
b. 2
c. 3
d. 4
e. None of the above
Q. The ratio of the strength of the weld mterial to that of the parent body is
a. Increasing the diameter of threaded portion
b. more than one
c. less than one
d. equal to one
Q. Hot isostatic pressing of metals reduces
a. porosity
b. Increasing the diameter of threaded portion
c. endurance limit
d. fatigue strength
e. ductility
Q. With a punch for which the maximum crushing stress is 4 times the maximum shearing stress of the plate, the biggest hole that can be punched in the plate would be of diameter equal to
a. 4 x plate thickness
b. 1/4 x thickness of plate
c. 1/2 x thickness of plate
d. 2 x plate thickness
e. Plate thickness
Q. Power capacitors are used
a. To improve electrical capacity
b. To improve efficiency
c. To reduce power factor
d. To improve power factor
e. None of the above
Q. The ratio of the area of cross-section of a circular section and the area of its core is
a. 10
b. Increasing the diameter of threaded portion
c. 16
d. 12
e. 8
Q. What type of gears are provided in a switch gear?
a. Spur gears
b. Helical gear
c. Bevel gears
d. Herringbone gears
e. None of the above
Q. Allen bolts are
a. Self-screwing bolts
b. Self locking bolts
c. Counter sunk
d. Used on aircraft
e. Provided with hexagonal depression in head
Q. Centrifugal tension in belts
a. reduces power transmission
b. increases power transmission
c. does not affect power transmission
d. none of the above
e. Cast steel
Q. The stress concentration factor for flat bar in tension with a circular hole, is
a. 1.5
b. 1
c. 2.5
d. 1.25
e. 2