58) The value of bulk modulus of a fluid is required to determine

Reynold's number

Froude's number

Mach number

Euler's number

Answer is:

Mach number

Explanation:

Bulk Modulus is a measure of the resistance of a fluid to compression. It is defined as the ratio of pressure stress to volumetric strain.
The value of bulk modulus of a fluid is required to determine Mach number. Mach number (M or Ma) is a dimensionless quantity. It represents the flow of velocity beyond the boundary when compared to the local speed of sound. It is used to determine the resistance of fluid or gas in its compressed state.

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62) Fixtures are used

For holding and guiding the tool in drilling, reaming or tapping operations.

For holding the work in milling, grinding, planing or turning operations.

To check the accuracy of work piece.

None of the above

Answer is:

For holding the work in milling, grinding, planing or turning operations.

Explanation:

Fixtures are the work holding devices, which holds, supports and locates the workpiece but not guides the cutting tool to perform a specific operation.