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Machine Design

Machine Design
Which is positive drive?

Flat belt drive
Timing belt
Crossed belt drive
V belt drive

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Machine Design
The shock absorbing capacity of a bolt may be increased by

Decreasing its shank diameter
Making the shank diameter equal to core diameter of thread
Tightening the bolt properly
Increasing its shank diameter

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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
2W/3
8W/9
W/2

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Machine Design
The cam follower extensively used in aircraft engines is

Knife edge follower
Spherical faced follower
Roller follower
Flat faced follower

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Machine Design
A shaft is subjected to fluctuating loads for which the normal torque (T) and bending moment (M) are 1000 N-m and 500 N-m respectively. If the combined shock and fatigue factor for bending is 1.5 and combined shock and fatigue factor for torsion is 2, then the equivalent twisting moment for the shaft is

2000 N-m
2100 N-m
2136 N-m
2050 N-m

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Machine Design
The smallest diameter of an external or internal screw thread is known as

Pitch diameter
None of these
Minor diameter
Major diameter

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