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The stairs which are kept in motion by a revolving drum is known as a _______

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The stairs which are kept in motion by a revolving drum is known as a _______

(a) Escalator

(b) Revolving Stairs

(c) Lift

(d) Elevator

The question was posed to me in quiz.

The doubt is from Types of Stairs topic in chapter Arches, Lintels, Stairs and Formwork of Construction & Building Materials

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Right answer is (a) Escalator

For explanation: These stairs are known as the escalators a were moving flights of electrically operated stairs. A few steps at top and bottom are kept level through moving individually. The only thing a person has to do is to occupy a step of the escalator for his upward and downward motion.

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