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Machine Design

Machine Design
In the levers of __________ type, the mechanical advantage is less than one.

First
None of these
Third
Second

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Machine Design
Multiple threads are used to secure

High load lifting capacity
Low efficiency
High mechanical advantage
High efficiency

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Machine Design
The following type of nut is used with alien bolt

Castle nut
Slotted nut
Any one of the above
Hexagonal nut

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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

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

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Machine Design
The groove angle of pulleys for V-belt is

More than 400
340 to 360
300 to 320
420 to 450

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Machine Design
A long helical spring having a spring stiffness of 12 kN/m and number of turns 20, breaks into two parts with number of turns 10 each in both the parts. If the two parts are connected in series, then the softness of the resultant spring will be

12 kN/m
24 kN/m
30 kN/m
6 kN/m

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