Podcast
Questions and Answers
Which tool is primarily used for laying out large circles?
Which tool is primarily used for laying out large circles?
- Divider
- Scriber
- Hermaphrodite caliper
- Trammel (correct)
What material is typically used for making scribers?
What material is typically used for making scribers?
- Wrought Iron
- Bronze
- High carbon steel (correct)
- Mild steel
What is a known grade for commonly available 'V' blocks?
What is a known grade for commonly available 'V' blocks?
- A1 & A2 (correct)
- A & B
- 1 & 2
- 0 & 1
Which alloy is known as German Silver, comprising elements besides Copper?
Which alloy is known as German Silver, comprising elements besides Copper?
Which material is commonly used for bearing bushes?
Which material is commonly used for bearing bushes?
What type of rule is typically used by pattern makers for laying out casting patterns?
What type of rule is typically used by pattern makers for laying out casting patterns?
Which among the following metals is essential for the corrosion-resistant properties of alloys?
Which among the following metals is essential for the corrosion-resistant properties of alloys?
Which tool is less suitable for precision work compared to the others listed?
Which tool is less suitable for precision work compared to the others listed?
What are the main constituents of stainless steel?
What are the main constituents of stainless steel?
What is the desirable hardness for a file?
What is the desirable hardness for a file?
What percentage of carbon does low carbon steel typically contain?
What percentage of carbon does low carbon steel typically contain?
Which of the following is NOT a work holding accessory of a lathe?
Which of the following is NOT a work holding accessory of a lathe?
Crane hooks are generally made of which material?
Crane hooks are generally made of which material?
In a drill bit, the angle of the flute is known as what?
In a drill bit, the angle of the flute is known as what?
Which of the following is NOT considered a mechanical property of a metal?
Which of the following is NOT considered a mechanical property of a metal?
The process of shaping metal by removing material is typically referred to as what?
The process of shaping metal by removing material is typically referred to as what?
What instrument is typically used to measure higher temperatures?
What instrument is typically used to measure higher temperatures?
What does the ratio of shear stress to shear strain represent?
What does the ratio of shear stress to shear strain represent?
How is momentum calculated for a moving body?
How is momentum calculated for a moving body?
Which statement accurately describes the factor of safety?
Which statement accurately describes the factor of safety?
Which of the following is an example of a first order lever?
Which of the following is an example of a first order lever?
What formula represents the resultant force from two forces acting at an angle?
What formula represents the resultant force from two forces acting at an angle?
What is the thermal conductivity of an ideal heat insulator?
What is the thermal conductivity of an ideal heat insulator?
Which term refers to the density of a material relative to water?
Which term refers to the density of a material relative to water?
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Study Notes
Constituents of Stainless Steel
- Main components are Iron, Chromium, Nickel, and Carbon.
- Variants include options with Tungsten and Vanadium.
Hardness of a File
- Desirable hardness for a file typically ranges from 60 to 90 HRC, with 85 HRC often preferred.
Carbon Content in Low Carbon Steel
- Low carbon steel contains approximately 0.1 to 0.3% of Carbon.
Lathe Work Holding Accessories
- Face Plate, Mandrel, Catch Plate, and Self-Centering Chuck are all common accessories; one may not be suitable.
Crane Hooks Material Composition
- Crane hooks are usually made from High carbon steel, Wrought iron, Cast steel, or Cast iron.
Drill Bit Flute Angle
- The angle of the flute in a drill bit is referred to as the Helix Angle.
Mechanical Properties of Metals
- Corrosion resistance, strength, hardness, and elongation percentage are mechanical properties; one option is not.
Tools for Laying Out Circles
- Common tools include Divider, Hermaphrodite caliper, Trammel, and Scriber for large circles.
Pattern Makers Tools
- A shrink rule is commonly used by pattern makers for laying out casting patterns and core boxes.
'V' Block Grades
- Common grades of 'V' blocks are A1 & A2.
Material for Making Scribers
- High carbon steel is typically used for making scribers.
Components of German Silver
- The alloy consists of Tin and Zinc, apart from Copper.
Bearing Bushes Material
- Gun metal is commonly used for manufacturing bearing bushes.
Key Components of Corrosion-Resistant Steel
- Key constituents include specific heat, relative heat, specific gravity, and relative gravity.
Instruments for Measuring High Temperatures
- A Pyrometer is the instrument used for measuring high temperatures.
First Order Lever Example
- Examples include Coal Tongs and Brake Pedal, with specific levers distinguished by their design efficiency.
Resultant Force Calculation
- The resultant force (R) of two forces (P and Q) acting at an angle θ is given by the equation: ( R = \sqrt{P^2 + Q^2 + 2PQ \cdot \cos(\theta)} ).
Momentum of a Moving Body
- Momentum is calculated using the formula: Mass x Velocity.
Shear Stress and Shear Strain Ratio
- The ratio of shear stress to shear strain is known as the Modulus of Rigidity.
Factor of Safety
- Defined as the ratio of Ultimate Stress to Working Stress, providing a safety margin in design.
Thermal Conductivity of an Ideal Insulator
- Ideal heat insulators possess a thermal conductivity that approaches zero.
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