# FREE Mechanical Aptitude Question and Answers

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#### On a highway, an automobile is following a moving fire truck. The fire truck is moving at a 60 mph speed. What is the speed of the car if the distance between the two moving cars stays the same?

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The two cars must be moving at the same pace if the gap between them stays the same. Therefore, the car is also moving at 60 mph. Notably, this is not the same as the amount of energy needed to accelerate the vehicles to their similar speed. This depends on a variety of variables, namely the mass of each vehicle and air resistance, which is not what the question in this answer is asking.

#### Which of the following techniques uses a generating process to produce gear?

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A punch with a precise shape is pressed into a work piece during the cold working, metal forging process known as hobbing. The desired cavity will be created with the exact proportions needed thanks to a special punch known as a hob.

#### Draft on casting pattern is

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The draft is a taper that makes it easier to remove patterns. The complexity of the design, the type of mold, and the surface type all affect how precisely the taper is angled. Metal contracts when it cools, just like all materials. The casting would be smaller than necessary if the pattern were created in the exact dimensions required for the finished product.

#### Using jigs and fixtures is intended to

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Jigs and fixtures are tools for holding and supporting work in large-scale manufacturing processes. It was used to quickly and firmly position workpieces and tools. Jigs and fixtures make locating during machining easier while also preserving the proper relationship between the cutting tool and workpiece. They make sure that each component is machined to exacting standards and tolerances.

#### Individual jars simultaneously lighted and covered the identical candles. The flame of which candle would go out first?

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For a flame to keep burning, it needs fuel and oxygen. In all three cases, the fuel comes from the wax. Jar C has air exchange, allowing the candle to use more oxygen to burn longer. Systems in Jars A and B are shut off. Oxygen cannot enter. Once all of the oxygen is used, the flame will self-extinguish. A must be put out first since there is less air in the small jar, A, than there is in the large jar, B.

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#### The term for the increase in hardness brought on by cold working is

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Work hardening is the process of plastically deforming a metal to strengthen it. When a metal is stretched above its yield point, more and more stress is needed to cause more plastic deformation, and the metal appears to have grown stronger and harder to deform because of this constant increase in actual stress.

#### Which of the following properties of the working substance will change as a result of reversible heat exchange?

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Entropy measures how randomly and widely distributed a system's energy and mass are. Entropy is a state function, similar to temperature or pressure, as opposed to a path function, similar to heat or work, which is significant.

#### Fire doors have a spring that, when the door is open, pushes and forces it shut. What impact would thicker springs have on the door's ability to close?

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The door is closed by the spring. A stronger, thicker spring will close the door with more power than it did previously.

#### The factors that most affect the cutting tool's tool life are

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The pace at which a tool is cutting along its outside edge is referred to as cutting speed, also known as surface speed. Surface feet per minute are used to measure it (SFM). Cutting speed is mostly influenced by the sort of materials and cutting instruments used, specifically how hard they are.

#### A cylindrical, air-filled, non-pressurized metal tank is submerged under water. The tank gradually sinks farther underwater as the air departs. Which of the following best justifies this motion?

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The tank's density quickly equals that of the water as air departs, and as a result of this plus the weight and density of the new water, the tank continues to sink.

#### Two identical automobiles are parked alongside a bridge. Which area(s) of the bridge would experience the highest deflection if it were all the same thickness?

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Due to its distance from the towers and pillars that support it, the middle of the bridge would deflect the most. Imagine a piece of string stretched across the space between two tables, held at either end. The point closest to the center would sag the most.

#### The lower side of a bucket filled with water is leaking. What happens to the speed of the water leaving the hole when the water level drops?

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The amount of pressure applied to the water as it exits the bucket through the hole determines how quickly it does so. A bigger amount of water is trying to escape the bucket through the hole when it is full. A bigger mass of water results in a greater pressure, which leads to a faster speed when there is a greater volume of water present. The volume, as well as the water's mass and pressure, drop as more liquid exits the bucket through the hole.

#### Vehicle rearview mirrors are made of convex mirrors. What benefit does utilizing a convex mirror over a flat mirror provide?

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Because of its design, a convex mirror has a larger field of vision. A larger field of view can minimize the size of the area that is difficult to see or remove blind spots.

#### The machining of continuously formed chips

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Continuous chips are created in the machining process when ductile material is machined at high speeds with little tool-to-material friction. This kind of chip is created as a result of the tool's continuous plastic deformation. Copper and mild steel are both ductile materials.

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