EIAT Mechanical Aptitude 4

Question 1

What does the term 'mechanical advantage' mean in the context of simple machines?

Accepted Answer

The ratio of output force to input force

Answer

Mechanical advantage is the ratio of the output force produced by a machine to the input force applied to it.

Question 2

An elevator rope has a 7×19 wire rope construction. What does '19' refer to?

Accepted Answer

The number of wires in each strand

Answer

In a 7×19 designation, 7 is the number of strands and 19 is the number of individual wires within each strand.

Question 3

Which of the following best describes the function of a brake on a gearless traction elevator?

Accepted Answer

Hold the car stationary when the motor is de-energized

Answer

The electromagnetic brake engages when power is removed from the motor to hold the car and prevent drift at a landing.

Question 4

In a hydraulic system, a pressure relief valve is set to open at 1,200 psi. What happens when system pressure reaches 1,500 psi?

Accepted Answer

The valve opens and bypasses fluid back to the reservoir

Answer

A pressure relief valve opens to divert excess fluid back to the reservoir, protecting the system from overpressure damage.

Question 5

Which type of thread provides the greatest mechanical advantage for converting rotary motion to linear motion, commonly used in elevator screw-drive systems?

Accepted Answer

Acme thread

Answer

Acme threads have a trapezoidal profile that provides high efficiency and load-bearing capacity for power transmission applications like screw-drive elevators.

EIAT - Elevator Industry Aptitude Test Practice Test

EIAT - Elevator Industry Aptitude Test Practice Test

EIAT Mechanical Aptitude 4