Free EIAT Mechanical Aptitude Questions and Answers

Question 1

In which direction will the swings tilt?

Accepted Answer

A – Up; B – Down

Answer

Explanation:
In order to determine in which direction the swings tilt, we will need to determine the rotation direction of each gear that comes in contact with the swing. They are marked in the picture below as gears A and B.
Counting the gears from the red gear to gear A, we see there are 8 gears. Therefore, the red gear and gear A rotate in the same direction – counterclockwise. That rotation will cause the right arm of swing A to tilt downwards (blue arrow), and therefore the opposite side will tilt upwards.
In the same manner, there are 7 gears between the red gear and gear B, and therefore it will rotate in the opposite direction – clockwise. That will tilt the right arm of the swing upwards, causing the left side to tilt downwards.

Question 2

Which cyclist has to pedal harder in order to go up the ramp?

Accepted Answer

B

Answer

Explanation:
In this question, we are asked which rider would need to pedal harder in order to climb the ramp.
We can see that though the ramps are of different lengths, the height of the logs in both cases is the same. For this reason, we should understand that the shorter ramp will be steeper. As is known from daily life, it is harder to pedal up a steeper incline.
Since in Figure B, the length is shorter and the incline is greater, it would be harder to pedal up the ramp.

Question 3

Which tractor has to drive farther in order to bring the boat to shore?

Accepted Answer

2

Answer

Explanation:
Tractor 2 will drive in a straight horizontal heading, in the same direction as the boat is from the shore. This is the shortest line possible.
Tractor 1 will also drive in a horizontal line, but as it is tied to the boat diagonally it will therefore pull the boat over a larger distance. However, tractor 1 will have to apply less force due to the mechanical help from the rock (the same as in a movable pulley).

Question 4

Which way will the bottom cogwheel rotate?
(If the information is insufficient, mark C.)

Accepted Answer

A

Answer

Explanation:
When contact is made between the rack (toothed belt) and the cogwheels, a conversion from a linear velocity to an angular velocity occurs. The location of the point of contact is critical.
The point of contact between the red cogwheel and the rack is in the lower part of the red cogwheel. The counterclockwise angular velocity induces a linear velocity to the right.
The point of contact between the grey cogwheel and the rack is in the grey cogwheel's upper part. The linear velocity to the right (determined by the rack) induces an angular velocity in a clockwise direction.
Remember the physical principle: When converting the linear velocity of a rack to the angular velocity, “translate” the rotation into arrows and follow the directions.

Question 5

If the middle gear is rotating clockwise, which gear, A or B, will rotate in the same direction?

Accepted Answer

Neither A nor B

Answer

Explanation:
It can be observed from the image that gears A and B are linked directly to the middle gear. However, when two gears are directly linked, their tangential velocities are always the same, although the directions of their rotation are always opposite to each other.
In our case, the velocity vector between the middle gear and gear A will point upwards and the direction of rotation of the middle gear and gear A will be clockwise and counterclockwise respectively. Similarly, the velocity vector between the middle gear G and gear B will point downwards and the rotation of gear B will be counterclockwise. Hence both gears A and B will rotate in the opposite direction of the middle gear.

EIAT - Elevator Industry Aptitude Test Practice Test

EIAT - Elevator Industry Aptitude Test Practice Test

Free EIAT Mechanical Aptitude Questions and Answers