17) The use of archemedian spiral curve is made in........
a) Teeth profiles of helical gears
b) Profiles of cams
c) Both a & b
d) None of these
18) The cams are widely used in........
a) Automates
b) Printing machines
c) C engines
d) All of these
19) Spring index =
a) Diameter of coil / diameter of a wire
b) Diameter of wire /diameter of coil
c) Mean diameter of wire / diameter of coil
d) Mean diameter of a coil / diameter of wire
20) Eccentricity =
a) Distance of a point from the focus / distance of the point from directrix
b) Distance of focus from point / distance of point from
c) Distance of point from focus / distance of directrix of point
d) Distance of point from directrix / distance of point from focus
21) Mathematically an ellipse can be described by equation.....
a) a2 / X2 + y2 / b2 = 1
b) x2 / a2 + y2 / b2
c) x2 / a2 + y2 / b2 = 0
d) x2 / a2 + y2 / b2 = 1
22) Mathematically a parabola can be described by an equation......
a) y2 = 4ax
b) x2 = 2ay
c) x2 = 4ay
d) Both a & b
23) Mathematically hyperbola can be described by an equation.......
a) x2 /a2 - y2 /b2 = 1
b) x2 /y2 - y2 /x2 = 0
c) Both a & b
d) None of these
24) Cycloid can be described by an equation......
a) y = a( 1-cos Ø )
b) x = a(Ø -sin Ø )
c) Both a & b
d) None of these
