Mechanical System

An architect is designing a 30-story office tower where tenants demand short waiting times. The client insists on minimizing shaft space while still ensuring smooth, rapid service. Which design factor is MOST critical in achieving this?

• Increasing the number of escalators in the building

• Installing wider elevator cars to carry more people per trip

• Selecting appropriate car speed and control system for traffic handling

• Reducing door opening width to save shaft space

• Using freight elevators as backup for passenger use

A 25-story office building spends almost 10% of its construction cost on elevators. The developer asks why elevators are so critical to leasing. What is the BEST explanation?

• Tenants focus only on rental cost, not on elevators.

• Elevator service quality directly influences tenant choice.

• Escalators are more cost-effective in tall buildings.

• Freight elevators can substitute for passenger cars.

• Tenants rarely notice vertical transport in building selection.

A 90-story mixed-use tower considers a sky lobby system. What is its MAIN advantage over conventional zoning?

• Shortens vertical trip length

• Eliminates the need for elevators entirely

• Reduces blind shaft space and improves efficiency

• Provides only decorative observation floors

• Requires fewer lobby levels

An architect proposes double-deck elevators in a 60-story office tower. What benefit do they provide?

• Reduce machine room size

• Increase shaft capacity and rentable floor area

• Eliminate the need for fire stairs

• Allow emergency evacuation through cars

• Lower construction cost per shaft

A 12-storey hospital requires vertical movement of beds and large medical equipment. Which elevator is MOST appropriate?

• Observation elevator

• Passenger elevator

• Freight elevator

• Hydraulic elevator

• Machine Roomless Elevator

Why was a rack and pinion elevator usually chosen in construction of midrise and high-rise buildings?

• It allows panoramic views for visitors

• It has unlimited rise, low maintenance, and space efficiency

• It avoids the use of counterweights

• It reduces installation costs compared to freight elevators

• It provides high speed at low cost

A retail mall chooses escalators over elevators between 3 floors. What MAIN advantage supports this?

• Lower shaft construction cost

• Continuous passenger flow without waiting

• Ability to move freight carts safely

• Reduced fire egress requirements

• Lower decorative costs

An architect selects center-opening doors for office building elevators. What is the MAIN advantage of this choice?

• Lower cost than single-slide

• Faster closing under higher pressure

• Faster and safer passenger transfer with wide opening

• Requires no electronic sensors

• Provides smaller shaft dimensions

Which component balances the car weight plus 40% of rated load, reducing motor size and power demand?

• Sheave

• Counterweight

• Governor

• Buffer

• Deflector pulley

An elevator stops automatically when overspeed is detected. Which device first acts to cut power and set the brake?

• Counterweight

• Centrifugal governor / electronic sensor

• Door interlock

• Car buffer

• Plunger