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Machine Design

Machine Design
The material used for brake lining should have __________ coefficient of friction.

Low
High
None of these
Moderate

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

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Machine Design
A self locking screw has

Coefficient of friction is greater than tangent of load angle
Course threads
Fine threads
Hole for inserting split pin

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Machine Design
The process which improves the machinability of steels, but lowers the hardness and tensile strength is

Spheroidising
Normalising
Full annealing
Process annealing

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Machine Design
The contact ratio for gears is

Less than one
Greater than one
Zero
None of these

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Machine Design
The endurance or fatigue limit is defined as the maximum value of the stress which a polished standard specimen can withstand without failure, for infinite number of cycles, when subjected to

Static load
Dynamic load
Completely reversed load
Static as well as dynamic load

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