Machine Design Elements - Test 1
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Questions and Answers

What is the maximum permissible carbon content for steel casting in as cast condition?

  • 0.25%
  • 0.26%
  • 0.20% (correct)
  • 0.15 to 0.18%
  • Which material is commonly used to make liners?

  • Alloyed steel
  • Alloyed bronze
  • Alloyed aluminium
  • Cast iron (correct)
  • Endurance strength is nearly proportional to the ultimate strength but not to which of the following?

  • Design stress
  • Yield strength (correct)
  • Shear stress
  • Fatigue limit
  • Which furnace is specifically used for melting non-ferrous metals?

    <p>Crucible furnace (B)</p> Signup and view all the answers

    What is the key factor in deciding the thickness and depth of a gear rim bead?

    <p>Circular pitch (PC) (B)</p> Signup and view all the answers

    Which term refers to the width of a gear’s tooth measured at the pitch circle?

    <p>Chordal thickness (D)</p> Signup and view all the answers

    What is the best instrument for measuring precision to a thousandth of an inch?

    <p>Micrometer (D)</p> Signup and view all the answers

    Which of the following organizations is not associated with standard material specification?

    <p>Southeast Asia Iron and Steel Institute (C)</p> Signup and view all the answers

    What cutting angle is best for drilling extremely hard metals?

    <p>70° (D)</p> Signup and view all the answers

    Which process is necessary to reduce brittleness in alloy steel?

    <p>Tempering (A)</p> Signup and view all the answers

    What is the efficiency percentage that welded joints can develop on mild steel materials?

    <p>100% (C)</p> Signup and view all the answers

    What does the lack of backlash in spur gear design potentially lead to?

    <p>Overloading (A)</p> Signup and view all the answers

    What type of forces are described as having lines of action that meet at one point?

    <p>Concurrent (D)</p> Signup and view all the answers

    What is the permissible variation of manufactured or machined dimensions called?

    <p>Tolerance (A)</p> Signup and view all the answers

    Which designation corresponds to molybdenum-chromium-nickel steel?

    <p>SAE 48xx (A)</p> Signup and view all the answers

    What is also referred to as strain hardening?

    <p>Work hardening (D)</p> Signup and view all the answers

    What is the term for the ability to resist deformation under stress?

    <p>Stiffness (A)</p> Signup and view all the answers

    What is the maximum recommended speed for flat leather belting?

    <p>3600 fpm (C)</p> Signup and view all the answers

    Which angle refers to the angle included between the sides of the thread in a screw thread?

    <p>Angle of thread (C)</p> Signup and view all the answers

    What defines Poisson's ratio?

    <p>Lateral deformation to longitudinal deformation (D)</p> Signup and view all the answers

    What is the SAE standard designation for manganese steel?

    <p>13XX (C)</p> Signup and view all the answers

    Which of the following materials is not classified as structural steel?

    <p>Stainless steel (D)</p> Signup and view all the answers

    Which term describes the property of matter that resists changes in motion or rest?

    <p>Inertia (B)</p> Signup and view all the answers

    What percentage of nickel does the SAE 2340 shafting contain?

    <p>3.25 to 3.75% Ni (A)</p> Signup and view all the answers

    Negative allowance is commonly known as what?

    <p>Tolerance (D)</p> Signup and view all the answers

    Which alloy is known to improve the strength of steel at high temperature applications?

    <p>Chromium (A)</p> Signup and view all the answers

    Which shape does not resemble a tool bit?

    <p>Round nose (D)</p> Signup and view all the answers

    The ideal ratio of contact for moderate speed of mating gears is which of the following?

    <p>1.25 - 4 (A)</p> Signup and view all the answers

    What is the ratio of unit lateral longitudinal deformation to unit longitudinal deformation called?

    <p>Poisson's ratio (B)</p> Signup and view all the answers

    What type of lathe has multiple cutting stations?

    <p>Turret lathe (A)</p> Signup and view all the answers

    The distance a helical gear or worm thread moves axially in one revolution is called what?

    <p>Lead (C)</p> Signup and view all the answers

    What term is used to describe the property of material that relates lateral strain to longitudinal strain?

    <p>Poisson's ratio (B)</p> Signup and view all the answers

    What shape does the moment curve take for a simple beam with a concentrated load at the middle span?

    <p>Triangle (B)</p> Signup and view all the answers

    Which cutting tool material is known for its ability to withstand high cutting speeds beyond the capabilities of others?

    <p>Carbide grade (B)</p> Signup and view all the answers

    Which is a common defect encountered in steel casting and welding practices?

    <p>Warping (B)</p> Signup and view all the answers

    Which among the following is not a type of mandrel?

    <p>Spiral (A)</p> Signup and view all the answers

    What is the recommended hardness range in BHN for a pinion used in helical or herringbone gear teeth?

    <p>40-50 (C)</p> Signup and view all the answers

    Which type of analyzer is most suitable for quickly analyzing elements and chemical components in steel casting?

    <p>Spectrometer (B)</p> Signup and view all the answers

    What is the arc of action in relation to the circular pitch or length of action to the base pitch?

    <p>Arc of action (B)</p> Signup and view all the answers

    What angle describes the relationship between the side cutting edge of a tool and the plane that is perpendicular to the direction of travel?

    <p>Side relief angle (D)</p> Signup and view all the answers

    What is the recommended minimum number of teeth in a small sprocket for high-speed applications?

    <p>18 to 24 (B)</p> Signup and view all the answers

    Which material is characterized by a high electrical resistance and should not be used as a conductor of electrical current?

    <p>Magnesium (C)</p> Signup and view all the answers

    What is the acceptable range of torsional deflection in degrees per foot of length in shaft design?

    <p>0.004 to 0.006 (C)</p> Signup and view all the answers

    What property characterizes a material's ability to be drawn into a wire?

    <p>Ductility (D)</p> Signup and view all the answers

    What is the term for the distance from a point on a screw thread to a corresponding point on the next measure along the axis?

    <p>Pitch (D)</p> Signup and view all the answers

    In the context of technical qualifications, what must a person have to be responsible for preparation of technical reports and specifications?

    <p>ME (C)</p> Signup and view all the answers

    What is the correct computation of cutting speed in feet per minute of a workpiece with a diameter of 2 inches running at 100 rpm?

    <p>26 (A)</p> Signup and view all the answers

    Which of the following qualifies an individual to teach professional subjects in a mechanical engineering course?

    <p>ME (B)</p> Signup and view all the answers

    Flashcards

    Carbon content in cast steel

    The amount of carbon in cast steel, typically less than 0.26% for certain applications.

    Liners Material

    Liners are commonly made of cast iron, despite other options existing.

    Endurance Strength

    Strength related to a material's ability to withstand repeated stress without failure.

    Non-ferrous Metal Melting Furnace

    Crucible or Induction furnaces are used to melt non-ferrous metals like copper and aluminum.

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    Ferrous Metal Melting Furnace

    Furnaces such as cupola furnaces are used for melting ferrous metals such as iron and steel.

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    Gear Rim Design

    Gear rim design considers circular pitch (PC) for even load distribution and structural rigidity.

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    Tooth Width Measurement

    Tooth width is measured along the chord of the pitch circle.

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    Precision Measurement Instrument

    A micrometer is the best instrument for measuring thousandths of an inch.

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    Inertia

    The property of matter that resists changes in its motion or state of rest.

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    Negative Allowance

    Also called tolerance, a permissible variation in size or dimensions.

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    Tool Bit Shape

    A tool bit's shape (e.g., round nose, square nose) affects its cutting action in machining.

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    Square Thread

    A thread type with equal width and depth, and even thread spacing.

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    Gear Contact Ratio

    The ideal ratio for gear contact to moderate speed mating.

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    Poisson's Ratio

    The ratio of lateral strain to longitudinal strain in a material.

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    Turret Lathe

    A lathe with multiple cutting stations for efficient machining.

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    Pitch Diameter

    The diameter of a screw thread relating to its pitch.

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    Stiffness

    A material's ability to resist deformation under stress.

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    Maximum Belt Speed (fpm)

    The fastest recommended speed for flat leather belting.

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    Angle of Thread

    Angle between the sides of a screw thread in an axial plane.

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    Spring

    An elastic body designed to deflect under load.

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    Poisson's Ratio

    Ratio of lateral deformation to longitudinal deformation in a material.

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    SAE Manganese Steel

    A specific standard for manganese steel, using a number system.

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    Structural Steel

    A type of steel suitable for structural applications.

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    Section Modulus

    Ratio of moment of inertia to the section's distance from neutral axis.

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    Drilling Angle for Hard Metals

    A drilling angle of up to 70 degrees is best for drilling extremely hard metals and soft materials.

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    Resultant Force

    A single force that produces the same effect as multiple forces acting together.

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    Improving Alloy Steel Brittleness

    Tempering is the process used to reduce brittleness in alloy steel.

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    Welded Joint Efficiency

    Welded joints can achieve up to 95% efficiency in developing structures, especially for mild steel.

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    Lack of Backlash in Gears

    A lack of backlash in spur gear design/operation can lead to overloading.

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    Concurrent Forces

    Concurrent forces are forces whose lines of action can be extended to intersect at a single point.

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    Thread Root

    The imaginary formed by the intersection of thread flanks extended is called the root.

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    Tolerance

    Permissible variation in the manufactured or machined dimensions of a part.

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    Moment Curve Shape (Concentrated Load)

    The moment curve for a simple beam with a concentrated load in the middle is triangular.

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    High-Speed Cutting Tool Material

    Cubic Boron Nitride (CBN) cutting tools can withstand higher cutting speeds than other materials.

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    Common Foundry Defects

    Cracks, cold shots (solidification defects), and blow holes are common defects in steel castings and welding.

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    Common Precision Tooling Materials

    Chrome-manganese, high-speed, and chrome-molybdenum steels are commonly used for precision tools.

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    Pinion Hardness (Helical Gear)

    The recommended hardness range for helical/herringbone gear pinions is 48-65 BHN.

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    Steel Casting Analysis

    Spectrometry is a fast method for analyzing the elemental composition of steel castings.

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    Alloy for High-Temperature Strength

    Molybdenum is an alloying element that improves strength at high temperatures, although in small quantities.

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    Non-Madrel Type

    A contraction madrel type is not a recognized type of madrel.

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    Minimum sprocket teeth for high speed

    18 to 24 teeth are recommended for small sprockets in high-speed applications.

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    Poor electrical conductor material

    Magnesium is a material with high electrical resistance and unsuitable for electrical current conduction.

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    Torsional deflection limit (degrees/foot)

    The acceptable limit for shaft twisting is between 0.006 and 0.008 degrees per foot of length.

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    Ductility property

    Ductility describes the ability of a material to be drawn into a wire.

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    Screw thread pitch

    The distance from a point on a screw thread to the corresponding point on the next thread.

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    Communication pipe color

    Light blue is the designated color for pipes used in communication.

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    Stress relieving steel

    Normalizing is a process used to reduce internal stress in steel.

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    Martensite Cr %

    Martensite (stainless steel) contains 4 to 26% chromium and maximum amount of 2.5% other elements.

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    Study Notes

    Machine Design Elements - Test 1

    • Device used to measure speed: Tachometer
    • Negative allowance when hole is smaller than shaft: Interference of metal
    • Laws to solve velocity of colliding elastic bodies: Conservation of momentum and conservation of energy
    • Ability to be deformed without rupture: Plasticity
    • Permanent deformation without fracture: Ductility
    • Science of motion solved in scalar/vector algebra: Kinematics
    • System force in equilibrium with equal and opposite collinear forces: Equilibrium is maintained
    • Metal that assists lubrication: Babbitt
    • Mechanism for indexing in machine tool: Dividing head
    • Equalizing energy exerted and work done: Flywheel/Balance of wheel/All of these
    • Smallest area at rupture of a tensile specimen: Percentage reduction of area
    • Product of resultant force and time: Linear impulse
    • Structural class of steel that is NOT a structural class: Tool and die steel
    • Ratio of lateral strain to longitudinal strain: Poisson's ratio
    • Maximum stress before failure: Ultimate stress
    • Special type of gear similar to bevel gear: Hypoid gear
    • Maximum safe center distance of sprockets: 80
    • Cold working of steel plates: Harder
    • Recommended drill angle for steel/cast iron: 59 degrees
    • Shear pin design max stress: 50 ksi
    • Motion of bodies without forces: Kinematics
    • Property of material drawn into wire: Ductility
    • Guide for face width in spur gears: 2.5 Pc < b < 4Pc

    Additional Study Notes (Page 2)

    • Metal that assists lubrication/lubricant in itself: Babbitt
    • Mechanism for indexing in machine tool: Dividing head
    • Equalizing energy exerted and work done: Flywheel
    • Smallest area at rupture of tensile specimen: Percentage reduction of area

    Additional Study Notes (Page 3)

    • Property of material relating lateral strain to longitudinal strain: Poisson's ratio
    • Maximum stress before failure: Ultimate stress
    • Type of gear similar to bevel gear: Hypoid gear
    • Maximum safe center distance for sprockets: 80
    • Cold working of steel plates: Harder
    • Recommended drill angle for steel/cast iron: 59° 
    • Shear pin design max stress: 50 ksi
    • Common shop practice to prevent solder from running away from the surface: All of these

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    Description

    Challenge your understanding of key concepts in machine design with this test. Covering areas such as kinematics, plasticity, and equilibrium, this quiz reflects essential topics necessary for engineers. Test your knowledge on devices, forces, and materials used in machine design.

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