# Mechanical Drawing Self-Taught Trivia Quiz Questions and Answers

What is the shortest distance between two points called?

• Diameter
• Chord
• Circumference

Correct Answer Explanation: A radius is the line segment from the center of a circle to any point on the circle. This is a fundamental concept in geometry and especially useful when drawing circles and arcs in mechanical drawings.

What is the standard angle measurement for a right angle?

• 180 degrees
• 90 degrees
• 45 degrees
• 360 degrees

Correct Answer Explanation: A right angle is one of the most basic geometric concepts, forming the corner of a square or rectangle. It is fundamental to understanding the construction of various shapes and the relationship between different lines.

What is the term for a closed figure with multiple straight sides?

• Circle
• Ellipse
• Polygon
• Curve

Correct Answer Explanation: A polygon is a closed shape formed by straight line segments that connect to create a closed loop. It is a fundamental concept in geometry and is often used to represent the shapes of objects in mechanical drawings.

What is the name of a polygon where all the sides are equal in length?

• Irregular polygon
• Regular polygon
• Simple polygon
• Complex polygon

Correct Answer Explanation: A regular polygon has all sides equal in length and all angles equal in measure. This specific type of polygon is frequently encountered in engineering applications, such as gears and nuts.

What is the formula for calculating the angle at the center of a regular polygon?

• 360 degrees divided by the number of sides
• 180 degrees divided by the number of sides
• 180 degrees minus the number of sides
• 360 degrees minus the number of sides

Correct Answer: 360 degrees divided by the number of sides

Correct Answer Explanation: The angle at the center of a regular polygon is formed by drawing lines from the center of the polygon to two adjacent vertices. The angle is determined by dividing 360 degrees (the total degrees in a circle) by the number of sides of the polygon. This formula helps determine the angle between adjacent sides of a regular polygon.

What is the formula for calculating the angle at the circumference of a regular polygon?

• 360 degrees divided by the number of sides
• 180 degrees divided by the number of sides
• 180 degrees minus the angle at the center
• 360 degrees minus the angle at the center

Correct Answer: 180 degrees minus the angle at the center

Correct Answer Explanation: The angle at the circumference of a regular polygon is formed by drawing lines from two adjacent vertices of the polygon to a point on the circle that circumscribes the polygon. This angle is calculated by subtracting the angle at the center from 180 degrees. This formula helps determine the angle between adjacent sides of a regular polygon.

What is the name of a closed curve with two foci where the sum of the distances from any point on the curve to the two foci is constant?

• Parabola
• Hyperbola
• Ellipse
• Spiral

Correct Answer Explanation: An ellipse is a closed curve with two foci. The property that the sum of the distances from any point on the curve to the two foci is constant is unique to ellipses. This property is key to their construction and application in mechanical drawing.

What is the standard for bolts and nuts in the United States?

• British Standard Whitworth
• Metric Standard
• French Standard

Correct Answer Explanation: The Unified Thread Standard (UTS) is the standard system for bolts, nuts, and screws used in the United States. This standard ensures uniformity and interchangeability in manufacturing.

What is the formula for calculating the short diameter of a hexagon bolt head for unfinished bolts?

• 1.5 times the diameter plus 1/8 inch
• 1.5 times the diameter plus 1/4 inch
• 2 times the diameter plus 1/8 inch
• 2 times the diameter plus 1/4 inch

Correct Answer: 1.5 times the diameter plus 1/8 inch

Correct Answer Explanation: This formula helps determine the size of the wrench needed to tighten the bolt, ensuring a proper fit for the tool.

What is the standard thickness of a rough bolt head?

• Half the diameter of the bolt
• The same as the diameter of the bolt
• Twice the diameter of the bolt
• One and a half times the diameter of the bolt

Correct Answer: The same as the diameter of the bolt

Correct Answer Explanation: This standard ensures that the bolt head is strong enough to withstand the applied force without breaking.

What is the term for the distance between two adjacent threads on a screw or two adjacent teeth on a gear wheel?

• Pitch
• Diameter
• Circumference

Correct Answer Explanation: This measurement is essential for defining the size and type of the thread. It determines how many threads or teeth are per inch of length.

What is the term for a screw thread that has two threads per pitch?

Correct Answer Explanation: This type of thread is used for specific applications, like larger diameter screws, and allows for faster advancement.

What is the difference between a left-hand thread and a right-hand thread?

• The direction the screw moves when turned clockwise
• The diameter of the screw
• The length of the screw
• The shape of the screw

Correct Answer: The direction the screw moves when turned clockwise

Correct Answer Explanation: This distinction is important for ensuring that screws and nuts are properly matched. A left-hand thread will move in the opposite direction of a right-hand thread when turned clockwise.

What is the purpose of a template when drawing screw threads?

• To provide accurate curves for the screw threads
• To measure the pitch of the thread
• To determine the diameter of the screw
• To calculate the length of the thread

Correct Answer Explanation: Using a template provides a more realistic depiction of screw threads in mechanical drawings. It ensures consistency and accuracy in the shape of the thread profile.

What is the term for the circle that passes through the centers of the teeth on a gear wheel?

• Pitch circle
• Base circle
• Dedendum circle

Correct Answer Explanation: This circle defines the fundamental dimension for gear teeth and their spacing. It is used to determine the size and spacing of the teeth on the gear wheel.

What is the standard depth of a gear tooth according to Professor Willis?

• 5/11 of the pitch
• 7/10 of the pitch
• 6/11 of the pitch
• 1/2 of the pitch

Correct Answer: 7/10 of the pitch

Correct Answer Explanation: This standard proportion ensures proper tooth engagement and smooth operation. It helps ensure that the gear teeth mesh correctly and avoid interference.

What is the standard thickness of a gear tooth according to Professor Willis?

• 5/11 of the pitch
• 7/10 of the pitch
• 6/11 of the pitch
• 1/2 of the pitch

Correct Answer: 5/11 of the pitch

Correct Answer Explanation: This proportion helps determine the strength and durability of the tooth. It ensures that the tooth is strong enough to withstand the forces applied during operation.

What is the standard space between two gear teeth according to Professor Willis?

• 5/11 of the pitch
• 7/10 of the pitch
• 6/11 of the pitch
• 1/2 of the pitch

Correct Answer: 6/11 of the pitch

Correct Answer Explanation: This proportion ensures that the teeth mesh correctly and avoid interference. It helps to maintain proper spacing between the teeth and prevent them from colliding.

What is the standard thickness of a finished bolt head?

• 1/16 inch less than the diameter of the bolt
• 1/8 inch less than the diameter of the bolt
• 1/4 inch less than the diameter of the bolt
• The same as the diameter of the bolt

Correct Answer: 1/16 inch less than the diameter of the bolt

Correct Answer Explanation: This standard helps ensure a precise fit for finished bolts and nuts. It allows for slight clearance between the bolt head and the nut to prevent binding.

What is the depth of a 4-inch pitch gear tooth?

• 2/5 of the pitch
• 3/10 of the pitch
• 1/2 of the pitch
• 2/3 of the pitch

Correct Answer: 3/10 of the pitch

Correct Answer Explanation: This specific value illustrates the application of Professor Willis’ standard proportions for gear teeth. It demonstrates the relationship between the pitch and the depth of the gear tooth.

What is the thickness of a 3-inch pitch gear tooth?

• 1/2 of the pitch
• 3/5 of the pitch
• 5/11 of the pitch
• 2/3 of the pitch

Correct Answer: 5/11 of the pitch

Correct Answer Explanation: This value demonstrates the relationship between pitch and tooth thickness according to Professor Willis’ standards. It helps to ensure that the tooth is strong and durable.

What is the top and bottom clearance in a Pratt and Whitney gear system?

• 1/10 of the pitch
• 1/8 of the pitch
• 1/6 of the pitch
• 1/4 of the pitch

Correct Answer: 1/8 of the pitch

Correct Answer Explanation: This clearance helps prevent interference and ensures smooth operation. It allows for slight movement between the teeth of the gear wheel to prevent binding and wear.

What is the clearance in a Brown and Sharpe gear system?

• 1/10 the thickness of the tooth
• 1/8 the thickness of the tooth
• 1/6 the thickness of the tooth
• 1/4 the thickness of the tooth

Correct Answer: 1/10 the thickness of the tooth

Correct Answer Explanation: This value demonstrates the importance of clearance in ensuring proper tooth engagement. It ensures that the teeth mesh correctly and avoid interference.

What is the safe load-bearing capacity of a 4-inch pitch gear according to Professor Marks?

• 1000 lbs. per inch width of wheel face
• 2000 lbs. per inch width of wheel face
• 5000 lbs. per inch width of wheel face
• 10000 lbs. per inch width of wheel face

Correct Answer: 2000 lbs. per inch width of wheel face

Correct Answer Explanation: This value provides a guideline for the strength of gear wheels. It helps to determine the maximum load that the gear wheel can safely transmit.

What is the safe load-bearing capacity of a 10-inch pitch gear according to Professor Marks?

• 1000 lbs. per inch width of wheel face
• 2000 lbs. per inch width of wheel face
• 5000 lbs. per inch width of wheel face
• 10000 lbs. per inch width of wheel face

Correct Answer: 10000 lbs. per inch width of wheel face

Correct Answer Explanation: This value highlights the relationship between pitch and the load-bearing capacity of a gear wheel. It shows that larger pitch gears can transmit higher loads.

What is the theoretical error in the length of a circular arc rectified by Professor Rankine’s method for a 60-degree arc?

• 1/900 of the length
• 1/1800 of the length
• 1/3600 of the length
• 1/7200 of the length

Correct Answer: 1/900 of the length

Correct Answer Explanation: This value shows the accuracy of the method for rectifying arcs. Professor Rankine’s method provides a close approximation of the length of a circular arc.

What is the theoretical error in the length of a circular arc rectified by Professor Rankine’s method for a 30-degree arc?

• 1/900 of the length
• 1/1800 of the length
• 1/3600 of the length
• 1/14400 of the length

Correct Answer: 1/14400 of the length

Correct Answer Explanation: This value illustrates the decreasing error with smaller arcs. As the angle of the arc decreases, the error in the approximation using Professor Rankine’s method becomes smaller.

What is the purpose of a dry pipe in a horizontal steam boiler?

• To prevent water from entering the steam line
• To increase the boiler’s efficiency
• To reduce the boiler’s pressure
• To regulate the steam flow

Correct Answer: To prevent water from entering the steam line

Correct Answer Explanation: This feature ensures that the steam supplied to the engine is as dry as possible. Water droplets in the steam can damage the engine, so the dry pipe separates the steam from the water in the boiler.

What is the standard air space between the brick walls of a boiler setting?

• 1 inch
• 2 inches
• 3 inches
• 4 inches

Correct Answer Explanation: This space helps prevent heat loss by radiation. The air acts as an insulator, reducing the amount of heat that escapes from the boiler.

How long does it take a boiler drilling machine to drill a 1 and 1/8-inch hole?

• 1 minute
• 2 minutes
• 2 and 1/2 minutes
• 3 minutes

Correct Answer: 2 and 1/2 minutes

Correct Answer Explanation: This value highlights the efficiency of the machine. It shows that the machine can drill a relatively large hole in a short amount of time.

Approximately how many holes can a boiler drilling machine drill per hour?

• 10 holes
• 15 holes
• 20 holes
• 25 holes

Correct Answer Explanation: This statistic gives a general idea of the machine’s productivity. It shows that the machine can drill a significant number of holes in a relatively short amount of time.

What is the speed of the drills in a boiler drilling machine?

• 100 feet per minute
• 200 feet per minute
• 340 feet per minute
• 400 feet per minute

Correct Answer: 340 feet per minute

Correct Answer Explanation: This value demonstrates the speed at which the drills operate. It shows that the drills rotate at a high speed, allowing them to drill quickly and efficiently.

What is the pressure of the soapsuds used to cool the drills in a boiler drilling machine?

• 20 lbs. per square inch
• 40 lbs. per square inch
• 60 lbs. per square inch
• 80 lbs. per square inch

Correct Answer: 60 lbs. per square inch

Correct Answer Explanation: This cooling method helps prevent overheating and improve drill lifespan. The soapsuds provide a constant stream of coolant to the drill bit, preventing it from getting too hot.

How long does it take to turn a 14-foot diameter boiler flange?

• 1 hour
• 2 hours
• 2 and 1/2 hours
• 3 hours

Correct Answer: 2 and 1/2 hours

Correct Answer Explanation: This value provides a general idea of the time needed to perform this task. It shows that turning a large boiler flange requires a significant amount of time.

How long does it take to cut out three 2-foot 6-inch holes in a 1 and 1/8-inch thick boiler end plate?

• 2 hours
• 2 and 1/2 hours
• 3 hours
• 3 and 1/2 hours

Correct Answer Explanation: This value gives an example of the time required for a specific task using the machine. It demonstrates the time required to perform a common operation using a boiler drilling machine.

What is the speed of revolution for the drills in a boiler drilling machine?

• 100 feet per minute
• 200 feet per minute
• 340 feet per minute
• 400 feet per minute

Correct Answer: 340 feet per minute

Correct Answer Explanation: This value highlights the high-speed nature of the machine. It shows that the drills rotate at a high speed, allowing them to drill quickly and efficiently.

What is the pressure of the soapsuds used to cool the drills in a boiler drilling machine?

• 20 lbs. per square inch
• 40 lbs. per square inch
• 60 lbs. per square inch
• 80 lbs. per square inch

Correct Answer: 60 lbs. per square inch

Correct Answer Explanation: This value reflects the necessary cooling power required for the operation. The soapsuds provide a constant stream of coolant to the drill bit, preventing it from getting too hot.

What is the largest diameter boiler end plate that the drilling machine can accommodate?

• 10 feet
• 12 feet
• 14 feet
• 16 feet

Correct Answer Explanation: This value illustrates the machine’s capacity. It shows that the machine is designed to work on large boiler components.

What is the shortest distance from the center of a circle to its circumference?

• Diameter
• Chord
• Circumference

Correct Answer Explanation: This fundamental geometric concept is essential for understanding circles and arcs in mechanical drawing. It is also the basis for calculating the area and circumference of a circle.

What is the measurement of the inclination of two lines that meet at a point?

• Angle
• Line
• Point
• Shape

Correct Answer Explanation: This concept is essential in understanding the relationship between different lines and shapes. It is also used to calculate the angles of polygons and other geometric figures.

What is the term for a closed figure with multiple straight sides?

• Circle
• Ellipse
• Polygon
• Curve

Correct Answer Explanation: This is a fundamental concept in geometry and is often used to represent the shapes of objects in mechanical drawings. It is also the basis for understanding the properties of different polygons, such as their area and perimeter.

What is the name of a polygon where all the sides are equal in length?

• Irregular polygon
• Regular polygon
• Simple polygon
• Complex polygon

Correct Answer Explanation: This specific type of polygon is frequently encountered in engineering applications, such as gears and nuts. It is also used in the design of many structures and objects.

What is the formula for calculating the angle at the center of a regular polygon?

• 360 degrees divided by the number of sides
• 180 degrees divided by the number of sides
• 180 degrees minus the number of sides
• 360 degrees minus the number of sides

Correct Answer: 360 degrees divided by the number of sides

Correct Answer Explanation: This formula helps determine the angle between adjacent sides of a regular polygon. It is also used to calculate the angles of other geometric figures, such as triangles and quadrilaterals.

What is the formula for calculating the angle at the circumference of a regular polygon?

• 360 degrees divided by the number of sides
• 180 degrees divided by the number of sides
• 180 degrees minus the angle at the center
• 360 degrees minus the angle at the center

Correct Answer: 180 degrees minus the angle at the center

Correct Answer Explanation: This formula helps determine the angle between adjacent sides of a regular polygon. It is also used to calculate the angles of other geometric figures, such as triangles and quadrilaterals.

What is the name of a closed curve with two foci where the sum of the distances from any point on the curve to the two foci is constant?

• Parabola
• Hyperbola
• Ellipse
• Spiral

Correct Answer Explanation: This property is key to their construction and application in mechanical drawing. It is also used in the design of many structures and objects.

What are the two fixed points within an ellipse called?

• Foci
• Vertices
• Centers
• Diameters

Correct Answer Explanation: These two points are important for understanding the properties of an ellipse, such as its shape and its relationship to other geometric figures.

What is the term for the distance between two adjacent threads on a screw or two adjacent teeth on a gear wheel?

• Pitch
• Diameter
• Circumference

Correct Answer Explanation: This measurement is essential for defining the size and type of the thread. It determines how many threads or teeth are per inch of length.

What is the term for a screw thread that has two threads per pitch?

Correct Answer Explanation: This type of thread is used for specific applications, like larger diameter screws, and allows for faster advancement. It is also used to create stronger and more durable threads.

What is the difference between a left-hand thread and a right-hand thread?

• The direction the screw moves when turned clockwise
• The diameter of the screw
• The length of the screw
• The shape of the screw

Correct Answer: The direction the screw moves when turned clockwise

Correct Answer Explanation: This distinction is important for ensuring that screws and nuts are properly matched. A left-hand thread will move in the opposite direction of a right-hand thread when turned clockwise.

What is the purpose of a template when drawing screw threads?

• To provide accurate curves for the screw threads
• To measure the pitch of the thread
• To determine the diameter of the screw
• To calculate the length of the thread

Correct Answer Explanation: Using a template provides a more realistic depiction of screw threads in mechanical drawings. It ensures consistency and accuracy in the shape of the thread profile.

What is the term for the circle that passes through the centers of the teeth on a gear wheel?

• Pitch circle
• Base circle
• Dedendum circle

Correct Answer Explanation: This circle defines the fundamental dimension for gear teeth and their spacing. It is used to determine the size and spacing of the teeth on the gear wheel.

What is the standard depth of a gear tooth according to Professor Willis?

• 5/11 of the pitch
• 7/10 of the pitch
• 6/11 of the pitch
• 1/2 of the pitch

Correct Answer: 7/10 of the pitch

Correct Answer Explanation: This standard proportion ensures proper tooth engagement and smooth operation. It helps ensure that the gear teeth mesh correctly and avoid interference.

What is the standard thickness of a gear tooth according to Professor Willis?

• 5/11 of the pitch
• 7/10 of the pitch
• 6/11 of the pitch
• 1/2 of the pitch

Correct Answer: 5/11 of the pitch

Correct Answer Explanation: This proportion helps determine the strength and durability of the tooth. It ensures that the tooth is strong enough to withstand the forces applied during operation.

What is the standard space between two gear teeth according to Professor Willis?

• 5/11 of the pitch
• 7/10 of the pitch
• 6/11 of the pitch
• 1/2 of the pitch

Correct Answer: 6/11 of the pitch

Correct Answer Explanation: This proportion ensures that the teeth mesh correctly and avoid interference. It helps to maintain proper spacing between the teeth and prevent them from colliding.

What is the term for a curve traced by a point on a circle as it rolls internally along another circle?

• Hypocycloid
• Epicycloid
• Cycloid
• Involute

Correct Answer Explanation: This curve is often used in the design of gear teeth to create a smooth and efficient meshing action. It is also used in the design of other mechanical components, such as cams and linkages.

What is the term for a curve traced by a point on a circle as it rolls externally along another circle?

• Hypocycloid
• Epicycloid
• Cycloid
• Involute

Correct Answer Explanation: This curve is often used in the design of gear teeth to create a smooth and efficient meshing action. It is also used in the design of other mechanical components, such as cams and linkages.

What is the term for the clearance between the teeth of a gear wheel or screw threads, allowing for slight movement?

• Backlash
• Pitch
• Depth
• Thickness

Correct Answer Explanation: This clearance is important for allowing the gears or threads to move smoothly and prevent binding. It is also used to prevent wear and tear on the teeth or threads.

What is the term for a side and an end view of a rivet?

• Orthographic projection
• Isometric projection
• Perspective projection
• Axonometric projection

Correct Answer Explanation: This type of projection shows the object from multiple views, each showing a different side of the object. It is a common technique used in mechanical drawing to create accurate representations of objects.

What is the term for a key that is used to connect a shaft and a hub?

• Key
• Wedge
• Pin
• Bolt

Correct Answer Explanation: This type of key is often used to prevent the shaft and hub from slipping relative to each other. It is a simple but effective way to create a secure connection between the two components.

What is the term for a double eye or knuckle joint?

• Hinge joint
• Pivot joint
• Universal joint
• Knuckle joint

Correct Answer Explanation: This type of joint is often used to connect two rods or shafts that need to be able to move in multiple directions. It is a common type of joint used in many mechanical systems.

What is the term for a screw thread that has a V-shaped profile?

Correct Answer Explanation: This type of thread is commonly used for general-purpose applications, such as bolts and screws. It is a strong and durable thread that is easy to manufacture.

What is the term for a screw thread that has a triangular profile with rounded edges?

Correct Answer Explanation: This type of thread is often used in applications where high strength and durability are required, such as in heavy machinery. It is a common standard in the United Kingdom.

What is the term for a screw thread that has a square profile?

Correct Answer Explanation: This type of thread is often used in applications where high accuracy and precise movement are required, such as in lead screws and linear actuators. It is a strong and durable thread that can withstand high loads.

What is the term for a screw thread that has a trapezoidal profile?

Correct Answer Explanation: This type of thread is often used in applications where high efficiency and low friction are required, such as in lead screws and power screws. It is a strong and durable thread that can withstand high loads and provide precise movement.

What is the term for a gear wheel that has straight teeth?

• Spur gear
• Bevel gear
• Worm gear
• Helical gear

Correct Answer Explanation: This type of gear is the most common type of gear and is used in a wide variety of applications, such as in transmissions and other mechanical systems. It is a simple and efficient gear that can transmit power smoothly and efficiently.

What is the term for a gear wheel that has teeth that are angled to the axis of rotation?

• Spur gear
• Bevel gear
• Worm gear
• Helical gear

Correct Answer Explanation: This type of gear is often used in applications where high efficiency and smooth operation are required, such as in transmissions and other mechanical systems. It is a more complex gear than a spur gear, but it can transmit power more smoothly and quietly.

What is the term for a gear wheel that has teeth that are angled to the axis of rotation?

• Spur gear
• Bevel gear
• Worm gear
• Helical gear

Correct Answer Explanation: This type of gear is used to transmit power between shafts that are at an angle to each other. It is often used in automotive differentials and other mechanical systems where shafts need to be connected at an angle.

What is the term for a gear wheel that has a worm-like screw that meshes with a gear wheel?

• Spur gear
• Bevel gear
• Worm gear
• Helical gear

Correct Answer Explanation: This type of gear is often used in applications where high torque reduction is required, such as in automotive steering systems and other mechanical systems. It is a very efficient gear that can transmit power smoothly and quietly.

What is the term for a cam that has a constant speed of rotation?

• Full stroke cam
• Cut-off cam
• Constant speed cam
• Variable speed cam

Correct Answer Explanation: This type of cam is often used in applications where a simple and consistent motion is required, such as in valve trains and other mechanical systems. It is a simple and efficient cam that can provide a smooth and predictable motion.

What is the term for a cam that has a variable speed of rotation?

• Full stroke cam
• Cut-off cam
• Constant speed cam
• Variable speed cam

Correct Answer Explanation: This type of cam is often used in applications where a complex and variable motion is required, such as in automation systems and other mechanical systems. It is a more complex cam than a full stroke cam, but it can provide a wide range of motions.

What is the term for a cam that has a limited stroke?

• Full stroke cam
• Cut-off cam
• Constant speed cam
• Variable speed cam

Correct Answer Explanation: This type of cam is often used in applications where a limited and controlled motion is required, such as in valve trains and other mechanical systems. It is a simple and efficient cam that can provide a smooth and predictable motion.

What is the term for a rod that connects a piston to a crankshaft?

• Connecting rod
• Crankshaft
• Piston rod
• Drive shaft

Correct Answer Explanation: This rod is a crucial component in internal combustion engines and other mechanical systems. It transmits the force from the piston to the crankshaft, converting the linear motion of the piston into the rotational motion of the crankshaft.

What is the term for a tool used to cut a specific shape for a moulding?

• Moulding cutter
• Shaping cutter
• Routing cutter
• Profiling cutter

Correct Answer Explanation: This tool is often used in woodworking and other manufacturing processes to create decorative or functional mouldings. It is a specialized cutter that can create a variety of shapes, depending on the design of the cutter.

What is the term for a type of projection that shows the object from multiple views, each showing a different side of the object?

• Isometric projection
• Orthographic projection
• Perspective projection
• Axonometric projection