Exercise: Machine Design

Questions for: Machine Design

The shear stress at a point in a shaft subjected to a torque is
A:
directly proportional to the polar moment of inertia and to the distance of the point from the axis
B:
directly proportional to the applied torque and inversely proportional to the polar moment of inertia
C:
directly proportional to the applied torque and the polar moment of inertia
D:
inversely proportional to the applied torque and the polar moment of inertia
Answer: B
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The usual proportion for the width of key is (where d = Diameter of shaft or diameter of hole in the hub)
A:
d/8
B:
d/6
C:
d/4
D:
d/2
Answer: C
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The load placed at the top of the screw in a mechanical screw jack is prevented from rotation by providing a swivelling mechanism.
A:
Correct
B:
Incorrect
C:
D:
Answer: A
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In the levers of first type, the mechanical advantage is __________ one.
A:
less than
B:
equal to
C:
more than
D:
Answer: C
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A shaft coupling should
A:
be easy to connect or disconnect
B:
transmit full power of the shaft
C:
hold the shafts in perfect alignment
D:
all of these
Answer: D
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