Spot facing is

A.Localised machining of a component
B.Machining of a spot to fit other parts
C.Mahining of spol on the surface of a part to furnish a flat bearing or the head of a holt or nut
D.A spot prepared on shaper or milling machine
E.None of above

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