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Machine Design

Machine Design
The pitch diameter is the __________ diameter of an external or internal screw thread.

Largest
Smallest
None of these
Effective

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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)

0.5 d
1.25 d
d
0.75 d

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Machine Design
Two helical springs of the same material and of equal circular cross-section, length and number of turns, but having radii 80 mm and 40 mm, kept concentrically (smaller radius spring within the larger radius spring), are compressed between two parallel planes with a load W. The inner spring will carry a load equal to

W/9
8W/9
W/2
2W/3

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Machine Design
The connecting rod bolts are tightened up with initial tension greater than the external load so that

Bolts will not loosen during service
Bolts are weakest elements
The resultant load on the bolt would not be affected by the external cyclic load
Joint may not open up

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Machine Design
A metal pipe of 1 m diameter contains a fluid having a pressure of 1 N/mm². If the permissible tensile stress in the metal is 20 N/mm², then the thickness of the metal required for making the pipe will be

10 mm
15 mm
25 mm
5 mm

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Machine Design
For tight leakage joints, following type of thread is best suited

Square
Buttress
Metric
NPT (national pipe threads).

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