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Machine Design part-3

Machine Design part-3
Question:-
Option (A)
Gerber relation
Option (B)
Soderberg relation
Option (C)
Goodman relation
Option (D)
None of the above
Correct Option:
B
Question Solution:
Taking sorderberg criteria the result are more conservative as maximum stress point will be as shown

Question:-
Option (A)
Major diameter equal to
Option (B)
Pitch diameter of threads
Option (C)
Minor diameter of threads
Option (D)
nominal diameter of threads
Correct Option:
C
Question Solution:
Bolt of uniform strength are made to resist shock load by
1. Making a hole (drilled) i.e. area of shank reduced to root area
2. Reducing the diameter of shank of bolt corresponding to that of minor diameter
Question:-
Option (A)
remains constant at all speeds
Option (B)
Is minimum at zero speed and increase monotonically with increase in speed
Option (C)
Is maximum at zero speed and decrease monotonically with increase in speed
Option (D)
Becomes minimum at an optimum speed and then increase with further increase in speed
Correct Option:
D
Question Solution:
Question:-
Option (A)
Enhance the load carrying capacity off the jack
Option (B)
Reduce the effort needed for lifting the working load
Option (C)
Reduce the value of frictional torque to be countered for lifting the load
Option (D)
Prevent the rotation of load being lifted
Correct Option:
D
Question Solution:
There is provision to prevent rotation by making load cup separate from the head of the spindle
Question:-
Option (A)
A B C D
3 2 1 4
Option (B)
A B C D
4 2 3 1

Option (C)
A B C D
3 2 4 1

Option (D)
A B C D
1 4 2 3

Correct Option:
C
Question Solution:
Wire shaft is also called flexible shaft where it is not possible to effect a rigid coupling between them
Axle supports only revolving parts
Plain shaft supports the revolving parts and transmits torque
Question:-
Option (A)
Both the ends fixed
Option (B)
Both the ends hinged
Option (C)
One end fixed and other end hinged
Option (D)
One end fixed and the other end free
Correct Option:
D
Question Solution:
One end fixed and other end free. As lower part of screw is free to rotate. The screw acts as column