The stairs which are kept in motion by a revolving drum is known as a _______
घूमते हुए ड्रम द्वारा गतिमान रखी जाने वाली सीढ़ियों को _______ के रूप में जाना जाता है
Revolving Stairs
Lift
Elevator
Escalator
Escalator
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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