The stairs which are kept in motion by a revolving drum is known as a _______(a) Escalator(b) Revolving Stairs(c) Lift(d) ElevatorThe 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

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

1.	The stairs which are kept in motion by a revolving drum is known as a _______(a) Escalator(b) Revolving Stairs(c) Lift(d) ElevatorThe 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
Answer» 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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The stairs which are kept in motion by a revolving drum is known as a _______(a) Escalator(b) Revolving Stairs(c) Lift(d) ElevatorThe 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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