Learning and understanding these concepts is essential for success on tests of mechanical comprehension. Mechanical comprehension test questions are the most commonly used test questions in mechanical aptitude tests. Mechanical comprehension tests measure your knowledge of mechanical and physical concepts including: Levers, Pulleys, Gears, Springs, Simple Electrical Circuits, Tools and Shop Arithmetic..
Modern mechanical comprehension tests often include fault diagnosis questions which are used to select personnel for technical roles where they need to be able to find and Therefore, time is an important issue in mechanical aptitude tests. Getting familiar with the format of the test in terms of appearance, the number of answer choices and exact topics coverage is what will give you that edge over the competition. It is never too late to practice.
Any practice you can do prior to your test will help you maximize your test score. When you enroll in our CAST test prep course you will gain access to a vast array of resources including, in-depth video presentations and instructions, module-based study guide PDFs, and additional full-length practice tests with questions, answers, and explanations.
By completing this exam, you will gain a clear idea of how prepared you are for the test-day. Our tests are created by industry professionals who review the actual CAST test regularly as well as interview former test-takers, so the information in the course stays up-to-date and relevant. C 60 lbs D 70 lbs Answer: C — 60 lbs is needed to lift the weight. However, in mechanical aptitude questions, you may see questions where the fulcrum has been placed closer to the force than the weight.
This will mean that a force greater than the weight will be required to lift it. You may see more complex questions involving levers. For example, there may be more than one weight.
In this case, you need to work out the force required to lift each weight independently and then add them together to get the total force required. Pulleys The pulleys used in this type of question consist of a grooved wheel and a block that holds it.
A rope runs in the groove around the wheel and one end will be attached to either: A weight A fixed object like the ceiling Another pulley For these questions, you can ignore the effect of friction. Single Pulley Which weight requires the least force to move? Single pulley questions are relatively straightforward. If the pulley is fixed then the force required is equal to the weight. If the pulley moves with the weight then the force is equal to half of the weight.
Another way of thinking about this is to divide the weight by the number of sections of rope supporting it, to obtain the force needed to lift it. Double Pulleys There are two possible ways that two pulleys can be used. Either one pulley can be attached to the weight or neither of them can be. Which weight requires the least force to move? Remember to divide the weight by the number of sections of rope supporting it, to get the force needed to lift the weight.
Mechanical Comprehension Test. C — Rubber mallet Fault Diagnosis Fault diagnosis tests are used to select technical personnel who need to be able to find and repair faults in electronic and mechanical systems.
As modern equipment of all types become increasingly complex and more dependent on electronic control systems, the ability to approach problems logically in order to find the cause of the fault is increasingly important. This skill is critical when working with complicated systems like those found in aircraft, ships and communications equipment.
This type of test usually forms part of a test battery in which verbal aptitude and numerical aptitude are also tested. There are two components to fault diagnosis questions: A grid that describes the function of a series of switches A flowchart showing: input — switches — output Each of the switches acts to alter the input before the next switch in the series.
The first switch diamond symbol inverts inputs one and two. That is, if the input is on, it is turned off and if it is off, it is turned on. The other switches act in a similar way as detailed in the grid. If a switch is not working then it does not affect the input which passes through unchanged.
You need to diagnose where the fault is in the flowchart below: Mechanical Reasoning Tests In this flowchart, all of the inputs numbered 1, 2, 3, 4 are on. However, the third switch is not working so the output from switch two is not changed. How to Pass Mechanical Reasoning Questions — Top Tips Mechanical reasoning tests will measure your applied knowledge so revision and practice are essential. It is the substance of the question that is important — the scenario is incidental.
Mechanical aptitude is, in large part, gained by practical application. It is a good idea to look at and experiment safely with real tools and learn how things go together and are taken apart. Read user manuals and try things out. Need further practice? If so, we recommend the mechanical test packages by JobTestPrep. Mechanical aptitude tests have a few things in common. Almost every question begins with some type of diagram that you will need to understand before you can answer the question. They are almost always timed multiple-choice tests, giving you less than a minute for each question.
Is there a standard mechanical aptitude test? Most mechanical aptitude tests draw on a library of questions from their question bank. Additionally, tests may be modified based on the type of position.
Which cannot bend without breaking? Of the choices, only the teacup cannot bend without breaking. The spoon, nail, and automobile tire are all made of materials that can bend without breaking. A knife blade is an example of which kind of simple machine? A knife blade is an example of an inclined plane. In the pulley sheave system shown, pulley 1 is rotating at 80 rpm. How fast is pulley 2 rotating? The ratio of diameters determines the ratio of sheave speed.
In the pulley system shown above , which pulley is rotating the slowest? The pulley with the greatest diameter is pulley D.
Therefore, it is the one that is rotating the slowest. Operating this car jack will take less effort if you. The car jack is a lever. Of the choices, the only one that will make the job easier is choice B, getting a longer jack handle. This will increase the effort distance in the lever and thereby increase the mechanical advantage.
Which material is best for the floor of a fireplace? The floor of a fireplace must be made of a material that will not ignite or melt with the heat of the fire.
Of the choices, the one that is best is stone. What effort is required to lift the load? Because the pulley has two supporting strands, it has a mechanical advantage of 2. Therefore, each pound of pull will produce 2 pounds of lift. What makes the water flow out of the tank and through the siphon hose into the bucket? Air pressure is what makes a siphon function. The weight of the air on the surface of the water in the tank forces water through the hose and into the bucket.
In the diagram, gear B is an idler gear. If gear B is rotating clockwise,. To make two gears turn in the same direction, an idler gear is required between them. The idler gear turns in the opposite direction from the two gears on either side of it. If idler gear B is rotating clockwise, gears A and C are both rotating counterclockwise. A wrench uses which simple machine to turn a bolt? The diagram shows a box of books on a shelf supported by two posts. Which post bears the greater part of the weight?
The post nearer to the load bears the greater part of the weight.
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