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Machine Design

Machine Design
The difference between the upper limit and lower limit of a dimension is called

Actual size
Tolerance
Basic size
Nominal size

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Machine Design
If d is the normal diameter of a bolt in mm, then the initial tension in kg in a bolt used for making a fluid tight joint as for steam engine cover joint is calculated by the relation

138 d
151 d
168 d
124 d

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Machine Design
Gear box is used

To increase efficiency of system
To obtain variable speeds
To produce torque
For speed reduction

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

Equal to
More than
Less than
None of these

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Machine Design
For crank shaft bearings, the ratio of the length of the journal to its diameter is_________.

Equal to 1
Greater than unity
Less than unity
None of these

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Machine Design
The bearing characteristic number in a hydrodynamic bearing depends upon

Length, width and load
Viscosity, speed and load
Viscosity, speed and bearing pressure
Length, width and speed

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