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Machine Design

Machine Design
When a bolt and nut is made of mild steel, then the effective height of nut is made equal to (where d = Nominal diameter of bolt)

1.25 d
0.75 d
0.5 d
d

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Machine Design
The application of second type levers is found in

Lever of a loaded safety valve
Hand wheel of a punching press
A pair of tongs
Handle of a hand pump

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Machine Design
The width of the pulley should be __________ width of the belt.

None of these
Equal to
Less than
Greater than

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Machine Design
Two closely coiled helical springs with stiffness k₁ and k₂ respectively are connected in series. The stiffness of an equivalent spring is given by

(k₁ - k₂)/ (k₁ k₂)
(k₁ k₂)/ (k₁ + k₂)
(k₁ - k₂)/ (k₁ + k₂)
(k₁ + k₂)/ (k₁ k₂)

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Machine Design
The diameter of the rivet hole is usually __________ the nominal diameter of the rivet.

None of these
Less than
More than
Equal to

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Machine Design
In worm gears, the angle between the tangent to the pitch helix and an element of the cylinder, is known as

Pitch lead angle
Helix angle
Pressure angle
None of these

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