The linear characteristics of valve is

A.In which the length of valve is more than 10 times the width
B.In which the longest parameter of valve is not less than 20 times the widest part of the valve
C.In which the valve steam operates linearly
D.One in which the flow is directly proportional to the valve lift
E.None of the above

Burr is

A.Unmachined portion of work piece
B.Boundary between finished and unifinished portion on a work piece
C.A marking or work piece to identify for correct position on a work piece
D.Burnt surface of a casting
E.Sharp edge remaining on the metal after curring, stamping or machining

The decibel is

A.Unit of noise level
B.A logarithmic ratio between a measured quantity and a reference quantity
C.Quantity of noise per unit area
D.A logarithmic ratio between a measured quantity and 100
E.None of the above


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