Top 550+ Solved Machine Design MCQ Questions Answer
Q. When both pinion and gear are made of the same material, then from the design point of view
a. Pinion is the determining factor
b. Gear is the determining factor
c. Any one of the two may be taken as determining factor
d. Criteria is strength of any one of the teeth
e. None of the above
Q. A rope sheave of balance weight for the cage is supported on an axle 25 cm. The maximum tension in the rope is 1500 kg. For safe design the point of application of the load should be considered at
a. Anywhere along the span
b. Case should be analysed for various positions of load along the span
c. Data should be taken from hand books
d. End points
e. Middle of span
Q. A belt when struck vibrates at a particular frequency determined by
a. shape of bell
b. size of ball
c. material of bell
d. All of the above
e. Increasing the diameter of threaded portion
Q. In rolling bearings lubricant viscosity
a. is decided on the basis of load
b. decides the life of bearing
c. is not determined by load
d. Increasing the diameter of threaded portion
e. is determined by operating speed
Q. Which dynamometer will be most suitable for measuring the BHP of an automobile engine?
a. Electrical generator type
b. Electrical resistance type
c. None of the above
d. Hydraulic type
e. None of the above
Q. The property which refers to the relative ease with which a material can be cut is known as
a. Malleability
b. Stiffness
c. Machinability
d. Chrome steel
e. Softness
Q. Fatigue failure starts at some
a. hole
b. Increasing the diameter of threaded portion
c. star
d. point
e. discontinuity
Q. Sintered bearing
a. Increasing the diameter of threaded portion
b. high rpm applications
c. find application is instruments
d. are self-lubricating type suitable for placs where regular maintensance is difficult
e. are used for under water applications
Q. Hysteresis and eddy current losses in bearings are typical to
a. high speed bearings
b. bearings for induction motors
c. electromagnetic bearings
d. Increasing the diameter of threaded portion
e. foil bearings
Q. An induction motor meant for operation on 60 cycles per second is connected to a supply having 50 cycles per second. What will happen
a. The motor will not start
b. The motor will run with peculiar noise
c. The motor will get burnt
d. The motor will not take load
e. The operating speed of the motor will be less than the rated
Q. The buckling load depends on
a. Modulus of elasticity
b. Slendemess ratio
c. Cross-sectional area
d. All of the above
e. None of the above
Q. The maximum efficiency of a scres jack provided with square threads and angle of friction 30? will be
a. 47%
b. 41%
c. 25%
d. 33%
e. 55.50%
Q. The bearing used in railway wagons are
a. Roller bearings
b. Ball bearings
c. Bush bearings
d. Journal bearings
e. Thrust bearings
Q. Which of the following operation causes residual compressive stress on the surface of the material?
a. Surface rolling
b. Shot peening
c. Induction hardening
d. All of the above
e. Increasing the diameter of threaded portion
Q. Which type of bearing is provided at the big end of connecting rod?
a. Ball bearing
b. Needle bearing
c. Cast iron bearing
d. Roller bearing
e. Ball bearing