Top 550+ Solved Machine Design MCQ Questions Answer
Q. Failure of rolling bearings occurs mainly due to
a. lubrication failure
b. fatigue
c. load and deformation
d. Increasing the diameter of threaded portion
e. plastic deformation
Q. In elevated circular steel tanks, conical bottoms are attached when
a. Increasing the diameter of threaded portion
b. water is alkaline
c. water is oily
d. water is acidic
e. water is muddy
Q. Small steel balls are manufactured by
a. Cold heading
b. Casting
c. Rolling
d. Turning in lathe
e. Spinning
Q. The casing of a water pump is generally
a. Made of soft material
b. Made of hard material
c. Made of chilled cast iron for water resistance
d. Made of non-ferrous materials
e. None of the above
Q. Bush bearings are
a. Phosphor bronze
b. Aluminium brass
c. Mild steel
d. White metal alloys
e. None of the above
Q. In a cotter joint in order to ensure that cotter does not work back
a. The taper on cotter should not exceed 1 in 24
b. Cotter should be made of stronger material
c. The taper on cotter should be more than 1 in 24
d. Cotter should be made thick
e. Shear pins should be applied on the cotter
Q. Cold working of materials
a. Increases the fatigue strength
b. Reduces the fatigue strength
c. Does not change fatigue strength
d. Has no effect on fatigue trength
e. None of the above
Q. A motor weighing 2000 kg is to be lifted by wrought iron eye bolt, screwed into the frame. Clioose-single bolt out of the following
a. M 30 coarse threads
b. M 12 fine threads
c. None as wrought iron is brittle
d. M 12 coarse threads
e. M 30 Fine threads
Q. An induction motor stator is cooled by
a. Air
b. Water
c. Hydrogen
d. Air and water
e. None of the above
Q. The following property is the most important for normal used for gas turbine blades
a. Increasing the diameter of threaded portion
b. Resistance to bending
c. Creep
d. Fatigue
e. Resistance to shear
Q. The efficiency of a screw track is maximum when its helix angle '?' is equal to
a. 45 - ?
b. 45 - ?/2
c. Increasing the diameter of threaded portion
d. 45 + ?/2
e. 45?
Q. When a section of a beam is plastified due to given system of loading then
a. the length of beam over which the moment is geater than or equal to the yield moment is plastified
b. only one section of beam is plastified
c. the whole length of beam is plastified
d. Increasing the diameter of threaded portion
e. the length of beam over which the moment is less than the yield moment is plastified
Q. Normally a spring operates within
a. Visco-elastic limits
b. Plastic limits
c. Para-elastic limits
d. Elasto-plastic limits
e. Elastic limits
Q. Non-metallic gears have
a. Low noise at higher speeds and low load carrying capacity
b. High noise at higher speeds and high load carrying capacity
c. Low noise at higher speeds and high load carrying capacity
d. Cannot be operated at higher spee
e. All of the above