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Mechanical Principles and Systems Quiz

#1

Which of the following devices converts mechanical energy into electrical energy?

Generator
Explanation

Generators convert mechanical energy, often from rotating turbines, into electrical energy through electromagnetic induction.

#2

Which of the following statements regarding friction is true?

Friction always opposes the motion of an object.
Explanation

Friction acts opposite to the direction of an object's motion, impeding its movement.

#3

Which of the following is NOT a type of lever?

Fourth-class lever
Explanation

Fourth-class levers do not exist; levers are classified into three types based on the relative positions of fulcrum, effort, and load.

#4

Which of the following is NOT a type of simple machine?

Gear
Explanation

Gears are not considered simple machines; they are components often used within machines to transmit motion or change speed/direction.

#5

What is the SI unit of torque?

Newton-meter
Explanation

Torque, a measure of rotational force, is measured in newton-meters in the International System of Units (SI).

#6

Which of the following best describes Pascal's law?

Pressure applied to a confined fluid is transmitted undiminished to every point of the fluid and to the walls of its container.
Explanation

Fluid pressure remains constant throughout a closed system, regardless of the container's shape.

#7

What is the principle behind the operation of a hydraulic jack?

Pascal's law
Explanation

Hydraulic jacks operate on the principle of Pascal's law, where pressure applied to a confined fluid is transmitted uniformly.

#8

What is the formula for calculating mechanical advantage in a simple machine?

Output force / Input force
Explanation

Mechanical advantage in a simple machine is the ratio of the output force to the input force.

#9

What is the principle behind the functioning of a gear train?

Law of torque
Explanation

Gear trains operate based on the principle of torque transmission, ensuring force multiplication or speed reduction.

#10

What does Hooke's law describe?

The restoring force exerted by a spring when it is stretched or compressed.
Explanation

Hooke's law describes the relationship between the force exerted on a spring and the resulting deformation, stating it's directly proportional.

#11

What does the term 'moment of inertia' refer to in mechanics?

The tendency of a body to resist angular acceleration.
Explanation

Moment of inertia quantifies a body's resistance to changes in its rotational motion.

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