ANGLE MEASURING TOOLS

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• Q1: What are Angle Measuring tools?
  Ans: Angle measuring tools are instruments used to measure, check, or set the angles between two surfaces or lines accurately.
• Q2: Name some Angle Measuring tools.
  Ans: Some angle measuring tools are:

  • ➔ Protractor
  • ➔ Bevel Protractor
  • ➔ Sine Bar
  • ➔ Angle Gauges
• Q3: What is Angular measure?
  Ans: Angular measure is the measurement of the opening between two lines or surfaces meeting at a point.
• Q4: State the units of Angular Measure.
  Ans: Units of angular measure are:

  • ➔ Degree (°)
  • ➔ Radian (rad)
  • ➔ Minute (`'`)
  • ➔ Second (`"`)
• Q5: Define Acute Angle.
  Ans: An acute angle is an angle that is less than 90°.
• Q6: Define Right Angle.
  Ans: A right angle is an angle that is exactly 90°.
• Q7: Define Obtuse Angle.
  Ans: An obtuse angle is an angle that is greater than 90° but less than 180°.
• Q8: Define Supplementary Angle.
  Ans: Supplementary angles are two angles whose sum is 180°.
• Q9: Define Complementary Angle.
  Ans: Complementary angles are two angles whose sum is 90°.
• Q10: Define Straight Angle.
  Ans: A straight angle is an angle that is exactly 180°.
• Q11: State the classification of Measuring Tools.
  Ans: Measuring tools are classified into:

  • ➔ Linear measuring tools
  • ➔ Angular measuring tools
  • ➔ Direct measuring tools
  • ➔ Indirect measuring tools
• Q12: What are Fixed Angle Measuring Tools?
  Ans: Fixed angle measuring tools are instruments used to measure or check angles that are preset or fixed and cannot be adjusted during use.
• Q13: Name some Fixed Angle Measuring Tools.
  Ans: Some fixed angle measuring tools are:

  • ➔ Angle Gauges
  • ➔ Fixed Squares
  • ➔ Bevel Squares
• Q14: What are Squares?
  Ans: Squares are measuring tools used to check and mark right angles (90°) between two surfaces or lines in engineering work.
• Q15: What are Combination Squares?
  Ans: Combination squares are adjustable tools used to measure 90° angles, 45° angles, and also for marking and checking depth and height.
• Q16: What are Tri-Squares?
  Ans: Tri-squares are simple L-shaped tools used to check and mark right angles (90°) on a workpiece.
• Q17: What are Double Squares?
  Ans: Double squares are precision tools with two blades used to check and mark internal and external right angles.
• Q18: What are Dimaker Squares?
  Ans: Diemaker squares are high-precision squares used in tool and die making for accurate angle checking and layout work.
• Q19: What are Center Squares?
  Ans: Center squares are tools used to find and mark the center of circular or cylindrical workpieces.
• Q20: What are Hard Steel Squares?
  Ans: Hard steel squares are precision squares made of hardened steel used for accurate right-angle checking and layout work.
• Q21: What are Thread Gauges?
  Ans: Thread gauges are tools used to check the pitch and profile of screw threads.
• Q22: What are Grinding Gauges?
  Ans: Grinding gauges are used to check the shape and angle of grinding tools and ground surfaces.
• Q23: What are Drill Gauges?
  Ans: Drill gauges are tools used to identify and check the diameter of drill bits.
• Q24: What are Wire Gauges?
  Ans: Wire gauges are measuring tools used to determine the diameter or size of wires and thin sheets.
• Q25: What are Adjustable Angle Measuring Tools?
  Ans: Adjustable angle measuring tools are instruments used to measure and set different angles by adjusting their parts.
• Q26: Name some Adjustable Angle Measuring Tools.
  Ans: Some adjustable angle measuring tools are:

  • ➔ Vernier Bevel Protractor
  • ➔ Universal Bevel
  • ➔ Combination Bevel
  • ➔ Sine Bar
• Q27: What is a Sine Bar?
  Ans: A sine bar is a precision instrument used to measure and set angles using slip gauges based on the sine principle.
• Q28: What is a Universal Bevel?
  Ans: A universal bevel is an adjustable tool used to measure and transfer angles accurately in mechanical work.
• Q29: What is a Combination Bevel?
  Ans: A combination bevel is a tool used to set, measure, and transfer angles, especially in layout work.
• Q30: What is a Bevel Protractor?
  Ans: A bevel protractor is a precision instrument used to measure angles accurately in degrees.
• Q31: What is a Vernier Bevel Protractor?
  Ans: A vernier bevel protractor is a precision tool that uses a vernier scale to measure angles with high accuracy.
• Q32: State the working principle of a Vernier Protractor.
  Ans: It works on the principle of vernier scale measurement.
  The main scale and vernier scale readings are combined to get precise angular measurement.
• Q33: What is a Dial Protractor?
  Ans: A dial protractor is an angle measuring instrument that shows readings on a dial for quick and accurate angle measurement.
• Q34: What is a Steel Protractor?
  Ans: A steel protractor is a simple angle measuring tool made of steel used for basic angular measurements.
• Q35: What is the minimum measurement for an angle?
  Ans: The minimum measurement of an angle is usually 1 minute (1`'`).
• Q36: Which tools measure the angle accurately?
  Ans: Accurate angle measuring tools are:

  • ➔ Vernier Bevel Protractor
  • ➔ Sine Bar
  • ➔ Angle Gauges
  • ➔ Dial Protractor