In a machining operation, if the generatrix and directrix both are straight lines, the surface obtained is

In a machining operation, if the generatrix and directrix both are str

1.	In a machining operation, if the generatrix and directrix both are straight lines, the surface obtained is
A.	cylindrical
B.	helical
C.	plane
D.	surface of revolution
Answer» D. surface of revolution

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In a machining operation, if the generatrix and directrix both are straight lines, the surface obtained is

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