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Q. |
## When the circle rolls along another circle inside it, the curve is called a |

A. | epicycloid |

B. | cycloid |

C. | trochoid |

D. | hypocycloid |

Answer» D. hypocycloid | |

Explanation: cycloid is a curve generated by a point on the circumference of a circle which rolls along a straight line. ‘epi’ represents the directing path is a circle. trochoid is a curve generated by a point fixed to a circle, within or outside its circumference, as the circle rolls along a straight line. ‘hypo’ represents the generating circle is inside the directing circle. |

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- is a curve generated by a point on the circumference of a circle, which rolls without slipping along another circle outside it.
- is a curve generated by a point fixed to a circle, within or outside its circumference, as the circle rolls along a straight line.
- is a curve generated by a point on the circumference of a circle which rolls without slipping on a straight line.
- The generating circle will be inside the directing circle for
- ‘Hypo’ as prefix to cycloids give that the generating circle is inside the directing circle.
- A sphere is placed on H.P and section plane is parallel to H.P the section is circle and if the section plane is parallel to V.P the section is again circle.
- For inferior trochoid or inferior epitrochoid the curve touches the directing line or directing circle.
- Straight lines drawn from the apex to the circumference of the base-circle are all equal and are called
- The hidden parts inside or back side of object while represented in orthographic projection are represented by which line?
- The generating point is outside the generating circle for